Cleaning device for vertical mill and its working method

Abstract

This invention belongs to the technical field of powder processing equipment, and particularly relates to a cleaning device for a vertical mill and its working method. One cleaning device for a vertical mill includes: a housing vertically mounted on a frame; at least two rocker arm devices mounted on the outer wall of the housing for driving the grinding roller to rotate and flip; a cleaning device fitted to one end of the rocker arm devices near the grinding roller, including a fixed box and at least two scrapers. The fixed box is hollow and connected to a hot air blower, and a gap is left between the two scrapers. The scrapers are raised and lowered at the bottom of the fixed box, with their lower ends abutting against the outer wall of the grinding roller. During operation, the scrapers adhere to the outer wall of the grinding roller to scrape away material from the roller surface. When the material adhering to the grinding roller surface pushes the scrapers toward the fixed box, the bottom wall of the fixed box delivers high-temperature air to the grinding roller surface to dry the material, and the scrapers abut against the outer wall of the grinding roller to scrape away the dried material.

Description

Technical Field

[0001] This invention belongs to the technical field of powder processing equipment, and particularly relates to a cleaning device for vertical mills 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 pulverized coal. 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 suppress dust during the grinding process, existing vertical roller mills generally employ internal water spray dust suppression technology. This involves atomizing water and spraying it into the grinding chamber to reduce dust concentration and improve the working environment.

[0003] However, the introduction of water spray dust suppression technology significantly increases the viscosity of materials, especially when processing materials that easily absorb water and stick, such as slag and clay. A large amount of sticky material easily adheres to the surface of the grinding roller, forming a dense adhesion layer. This adhesion layer directly reduces the efficiency of grinding pressure transmission between the grinding roller and the material, resulting in decreased grinding efficiency and increased energy consumption. At the same time, the uneven adhesion layer can disrupt the operational stability of the grinding roller, exacerbate equipment vibration and wear, and shorten the service life of core components.

[0004] To address the problem of material adhesion on the surface of grinding rollers, existing technologies mainly employ two types of cleaning methods: one is the rocker arm rotation scraping method, which uses a rocker arm device to drive the grinding roller to rotate, and uses the edge of the grinding disc or a fixed baffle to mechanically scrape off the adhered material; the other is the external mechanical scraper method, which sets a fixed or elastic scraper on the side of the grinding roller to physically scrape off the surface material. However, in practical applications, both of these methods have significant drawbacks: Incomplete cleaning: The sticky material after being wetted by spraying water has a very strong bond with the surface of the grinding roller. Simple mechanical scraping is not enough to peel off the dense adhesive layer, and it is easy to leave local material residue. Long-term accumulation will still affect the grinding effect. Poor adaptability: Different materials have significantly different viscosity, and existing mechanical cleaning methods cannot dynamically adjust the cleaning intensity according to the degree of adhesion, making them particularly ineffective for cleaning highly viscous materials.

[0005] Therefore, how to achieve efficient and thorough cleaning of sticky materials on the surface of the grinding rollers under continuous operation of a vertical mill, while improving the adaptability of the equipment, has become a technical problem that urgently needs to be solved 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 cleaning device for a vertical mill and its working method.

[0008] In a first aspect, embodiments of this disclosure provide a cleaning device for a vertical mill, comprising: The housing is vertically mounted on the frame; At least two rocker arm devices are disposed on the outer wall of the housing for driving the grinding roller to rotate and flip; A cleaning device is fitted onto one end of the rocker arm device near the grinding roller, and includes a fixed box and at least two scrapers. The fixed box is hollow and connected to a hot air blower, and a gap is left between the two scrapers. The scraper is lifted and lowered at the bottom of the fixed box, and its lower end abuts against the outer wall of the grinding roller; During operation, the scraper adheres to the outer wall of the grinding roller to scrape off the material on the surface of the grinding roller; When the material adhering to the surface of the grinding roller pushes the scraper to retract towards the fixed box, the bottom wall of the fixed box conveys high-temperature air to the surface of the grinding roller to dry the material, and the scraper abuts against the outer wall of the grinding roller to scrape off the dried material.

[0009] In one optional embodiment, the cleaning device further includes a balance plate and several compression springs, the balance plate being lifted and lowered within a fixed box; The two ends of the compression spring are fixed to the top wall inside the fixed box and the balance plate, respectively.

[0010] In one optional embodiment, the bottom wall of the fixed box is provided with several openings at equal intervals along the axial direction of the grinding roller; A sealing strip adapted to the opening is vertically fixed to the bottom wall of the balance plate. When the sealing strip is inserted into the opening, it is suitable for sealing the opening.

[0011] In one optional embodiment, the lower end of the sealing strip is trapezoidal, and the sidewall of the trapezoidal hypotenuse is provided with a flexible coating, which is a rubber coating or a silicone coating.

[0012] In one alternative embodiment, at least one scraper is vertically fixed to the bottom wall of the balance plate, and a cutting edge is provided at one end of the scraper near the grinding roller, the cutting edge being a wear-resistant cemented carbide cutting edge.

[0013] In one alternative implementation, the angle between a scraper and the horizontal plane is α, and the angle range is 65°-75°.

[0014] In one optional embodiment, the fixed box and the hot air blower are connected by a flexible air guide tube, and the flexible air guide tube is equipped with an air volume regulating valve, which is used to regulate the air volume of high-temperature air delivered from the fixed box to the surface of the grinding roller.

[0015] In one optional embodiment, the lower end face of the scraper is an arc-shaped surface, the curvature of which matches the curvature of the outer wall of the grinding roller, and the scraper is made of high manganese steel wear-resistant material.

[0016] In one optional embodiment, the inner wall of the fixed box is provided with a limiting groove, and the two sides of the balance plate are provided with limiting sliders. The limiting sliders are slidably embedded in the limiting groove, and the limiting groove and the limiting sliders cooperate to limit the lifting direction of the balance plate.

[0017] In one alternative embodiment, the rocker arm device includes a rocker arm body and a drive assembly. The drive assembly includes a hydraulic cylinder and a rotary motor. The hydraulic cylinder is used to drive the rocker arm body to rotate, and the rotary motor is used to drive the grinding roller to rotate. The cleaning device is detachably fixed to one end of the rocker arm body near the grinding roller by bolts.

[0018] Secondly, this disclosure also provides a method for operating a cleaning device for a vertical mill, comprising the following steps: S1. The cleaning device is installed at the end of the rocker arm device near the grinding roller, so that the lower end of the scraper naturally abuts against the outer wall of the grinding roller. Connect the fixed box to the hot air blower, start the vertical mill, and the rocker arm device drives the grinding roller to rotate and applies grinding pressure to the grinding disc. S2. Conventional scraping: During the rotation of the grinding roller, the scraper moves relative to the outer wall of the grinding roller to directly scrape off the loose material on the surface of the grinding roller that has not formed a dense adhesion layer. S3. Adaptive Drying and Scraping: When the sticky material adhering to the surface of the grinding roller forms a dense adhesion layer and pushes the scraper, the scraper drives the balance plate to move into the fixed box and compresses the compression spring. The sealing strip moves up with the balance plate and disengages from the opening. The high-temperature air in the fixed box blows through the opening onto the adhesion layer on the surface of the grinding roller to quickly dry the sticky material and reduce its stickiness. S4. Reset and scraping: After being dried by high-temperature air, the material's adhesion to the outer wall of the grinding roller decreases. Under the elastic reset force of the compression spring, the balance plate drives the scraper to move down. The blade of the scraper completely scrapes away the dried material. At the same time, the sealing strip is reinserted into the opening to complete the seal and stop the high-temperature air conveying. S5. Cyclic operation: The grinding roller rotates continuously, and steps S2-S4 are repeated to achieve real-time and adaptive cleaning of the material on the surface of the grinding roller. S6. Shutdown of the equipment: After the vertical mill is shut down, the rocker arm device drives the grinding roller to rotate to the non-working position, and the hot air blower is turned off. If maintenance is required, open the maintenance cover of the fixed box to inspect and maintain the internal components of the cleaning device.

[0019] The beneficial effects of this invention are that it provides a cleaning device and its working method for vertical mills. This invention breaks through the limitations of existing simple mechanical scraping methods. When a dense, sticky adhesive layer forms on the surface of the grinding roller, the hot air drying function is automatically triggered. High-temperature air rapidly reduces the material's viscosity and breaks down the bond between the material and the outer wall of the grinding roller. Combined with the scraping action of the carbide-cutting blade, it can thoroughly remove adhesive materials that are difficult to remove using traditional methods, fundamentally solving the problem of material residue accumulation and ensuring that the grinding roller surface is always clean. The hot air drying function is automatically activated and deactivated by the pushing force of the material against the scraper, requiring no manual intervention. The cleaning strategy can be dynamically adjusted according to the degree of material adhesion on the grinding roller surface. For loose materials, only conventional mechanical scraping is performed; for highly viscous, dense adhesive layers, a combined hot air drying and scraping mode is activated. This perfectly adapts to the grinding operations of different viscous materials such as cement, slag, and clay, significantly improving the device's adaptability to various operating conditions.

[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 a cleaning device for a vertical mill provided in an embodiment of this disclosure; Figure 2 A perspective view of the cleaning apparatus and grinding roller provided in an embodiment of this disclosure; Figure 3 This is a cross-sectional front view of the cleaning apparatus provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of the cleaning device blowing air onto the grinding roller according to an embodiment of the present disclosure.

[0024] In the picture: 1. Housing; 2. Frame; 3. Rocker arm assembly; 30. Grinding roller; 4. Cleaning device; 40. Fixing box; 41. Scraper; 42. Balance plate; 43. Compression spring; 44. Through port; 45. Sealing 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 the introduction of water spray dust suppression technology in related technologies significantly increases material viscosity. This is particularly problematic when processing easily absorbing and adhering materials such as slag and clay, where large amounts of sticky material readily adhere to the grinding roller surface, forming a dense adhesion layer. This layer directly reduces the efficiency of grinding pressure transmission between the grinding roller and the material, leading to decreased grinding efficiency and increased energy consumption. Furthermore, the uneven adhesion layer disrupts the stability of the grinding roller operation, exacerbates equipment vibration and wear, and shortens the service life of core components.

[0031] To address the problem of material adhesion on the surface of grinding rollers, existing technologies mainly employ two types of cleaning methods: one is the rocker arm rotation scraping method, which uses a rocker arm device to drive the grinding roller to rotate, and uses the edge of the grinding disc or a fixed baffle to mechanically scrape off the adhered material; the other is the external mechanical scraper method, which sets a fixed or elastic scraper on the side of the grinding roller to physically scrape off the surface material. However, in practical applications, both of these methods have significant drawbacks: Incomplete cleaning: The sticky material after being wetted by spraying water has a very strong bond with the surface of the grinding roller. Simple mechanical scraping is not enough to peel off the dense adhesive layer, and it is easy to leave local material residue. Long-term accumulation will still affect the grinding effect. Poor adaptability: Different materials have significantly different viscosity, and existing mechanical cleaning methods cannot dynamically adjust the cleaning intensity according to the degree of adhesion, making them particularly ineffective for cleaning highly viscous materials.

[0032] Therefore, how to achieve efficient and thorough cleaning of sticky materials on the surface of the grinding rollers under continuous operation of a vertical mill, while improving the adaptability of the equipment, has become a technical problem that urgently needs to be solved 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 4 As shown, at least one embodiment provides a cleaning device 4 for a vertical mill, comprising: The housing 1 is vertically mounted on the frame 2. The housing 1 is the main support structure of the vertical mill. It is made of high-strength steel and welded and fixed to the frame 2. It is cylindrical and open at the top. The outer wall of the housing 1 has an installation position for the rocker arm device 3 to achieve precise assembly of the rocker arm device 3.

[0037] like Figure 1 At least two rocker arm devices 3 are disposed on the outer wall of the housing 1 to drive the grinding roller 30 to rotate and flip. In this embodiment, three rocker arm devices are preferably arranged in an equilateral triangle to adapt to the conventional structure of the three grinding rollers 30 of the vertical mill. The rocker arm devices 3 are used to drive the grinding roller 30 to rotate and flip, and specifically include a rocker arm body and a drive assembly. The drive assembly consists of a hydraulic cylinder and a rotary motor. The cylinder end of the hydraulic cylinder is hinged to the outer wall of the housing 1, and the piston rod end is hinged to the middle of the rocker arm body. The extension and retraction of the hydraulic cylinder drives the rocker arm body to flip around the hinge point with the housing 1, so as to realize the pressing and disengagement of the grinding roller 30 onto the grinding disc. The rotary motor is fixed at the end of the rocker arm body away from the housing 1, and its output shaft is connected to the rotating shaft of the grinding roller 30 to provide power for the rotation of the grinding roller 30, so as to realize the relative rotation between the grinding roller 30 and the grinding disc and complete the material grinding.

[0038] like Figure 2 and Figure 3 The cleaning device 4 is fitted onto one end of the rocker arm device 3 near the grinding roller 30. It includes a fixed box 40, at least two scrapers 41, a balance plate 42, and several compression springs 43. The fixed box 40 is connected to an external hot air blower. The components work together to achieve adaptive switching between "conventional mechanical scraping" and "hot air drying + enhanced scraping". The specific structure and cooperation relationship of each component are as follows: like Figure 3The fixed box 40 is a hollow metal box made of stainless steel, which has the characteristics of high temperature resistance and corrosion resistance. It is fixed to the rocker arm body near the grinding roller 30 by bracket bolts. The box body and the grinding roller 30 are arranged parallel to each other axially. An air guide interface is opened on the back of the box body, which is connected to an external hot air fan through an air guide hose. An air volume regulating valve is installed on the air guide hose, which can precisely adjust the air volume of high-temperature air delivered from the fixed box 40 to the surface of the grinding roller 30 according to the viscosity of the material processed by the vertical mill (such as slag, clay and other high viscosity materials, the air volume is increased, and coal powder and other low viscosity materials are decreased). The hot air temperature is controlled at 80-120℃, which not only ensures the material is dry and the viscosity is reduced, but also prevents the grinding roller 30 from thermal deformation due to high temperature. The bottom wall of the fixed box 40 has several openings 44 at equal intervals along the axial direction of the grinding roller 30. The openings 44 are rectangular through holes, serving as channels for high-temperature air to be delivered to the surface of the grinding roller 30. The spacing of the openings 44 is 5-8cm, ensuring that the hot air covers the entire axial surface of the grinding roller 30 without any drying dead corners. The inner walls of the fixed box 40 are symmetrically machined with limiting grooves on both sides. The limiting grooves are vertical long grooves used to limit the lifting direction of the balance plate 42, preventing the balance plate 42 from shifting or getting stuck during movement. A detachable maintenance cover is also provided on one side of the fixed box 40, which facilitates opening the box to inspect and replace the balance plate 42, compression spring 43 and other components inside.

[0039] Continue to refer to the appendix Figure 3 The balance plate 42 is a metal plate adapted to the internal cavity of the fixed box 40. Limiting sliders (not shown in the figure) are welded on both sides of the plate. The limiting sliders are slidably embedded in the limiting grooves on the inner wall of the fixed box 40, realizing the vertical lifting and lowering of the balance plate 42 inside the fixed box 40 without deviation during the lifting and lowering process, ensuring the fit between the scraper 41 and the outer wall of the grinding roller 30. Several compression springs 43 are evenly distributed between the inner top wall of the fixed box 40 and the upper surface of the balance plate 42. The two ends of the compression springs 43 are fixed to the inner top wall of the fixed box 40 and the upper surface of the balance plate 42 by welding, respectively. In this embodiment, 6-8 compression springs 43 are preferred to ensure that the balance plate 42 is subjected to uniform force. The compression springs 43 are made of high-strength wear-resistant spring steel and have good elastic restoring performance. Their initial state is naturally extended, pushing the balance plate 42 downward so that the lower end of the scraper 41 naturally abuts against the outer wall of the grinding roller 30.

[0040] like Figure 3 The sealing strip 45 has a structure and sealing function. A sealing strip 45, adapted to the opening 44, is vertically fixed to the bottom wall of the balance plate 42. The sealing strip 45 is made of hard rubber, with a trapezoidal structure at its lower end. The sidewall of the trapezoidal inclined side is provided with a flexible coating (rubber coating or silicone coating; in this embodiment, silicone coating is preferred due to its high temperature resistance and better sealing performance). In its natural state, the sealing strip 45 is inserted into the opening 44, achieving a complete seal and preventing the leakage of high-temperature air from the fixed box 40. Figure 4As shown, when the scraper 41 is pushed into the fixed box 40 by the dense adhesive layer formed on the surface of the grinding roller 30, the scraper 41 pushes the balance plate 42 to move upward, and the sealing strip 45 moves upward synchronously with the balance plate 42, disengaging from the opening 44. The opening 44 opens, and the high-temperature air is blown out smoothly. Figure 4 In the diagram, F1 represents the direction of hot air flow inside the fixed box 40, and the hot air is blown onto the surface of the grinding roller 30 through the opening 44; F2 represents the pushing force of the dense adhesive layer formed on the surface of the grinding roller 30 on the scraper 41.

[0041] like Figure 3 and Figure 4 At least two scrapers 41 (preferably two in this embodiment, distributed front and back in the rotation direction of the grinding roller 30) are provided at the bottom of the fixed box 40. A gap is left between the two scrapers 41 to prevent the scraped material from accumulating between the two scrapers 41. At least one scraper 41 is vertically fixed to the bottom wall of the balance plate 42 (preferably both scrapers 41 are fixed to the balance plate 42 in this embodiment to achieve synchronous lifting and lowering), and moves vertically up and down with the movement of the balance plate 42. The scraper 41 is made of high manganese steel wear-resistant material, which has the characteristics of high hardness and high wear resistance, and is suitable for long-term scraping operation under the high-speed rotation of the grinding roller 30. The lower end surface of the scraper 41 is an arc surface, and the curvature of the arc surface is perfectly matched with the curvature of the outer wall of the grinding roller 30, ensuring that the lower end surface of the scraper 41 is fully in contact with the outer wall of the grinding roller 30, without any dead corners in scraping. The scraper 41 has a cutting edge machined at one end near the grinding roller 30. The cutting edge is a wear-resistant hard alloy cutting edge (tungsten cobalt hard alloy welded to the end of the scraper 41), which greatly improves the scraping ability of the scraper 41 and can easily peel off the dense and adhered material after hot air drying. The included angle α between one of the scrapers 41 and the horizontal plane is 65°-75° (70° is preferred in this embodiment). This angle is the optimal angle for scraping the material on the surface of the grinding roller 30. It ensures the effective transmission of scraping force, avoids excessive wear of the scraper 41 cutting edge due to excessive angle, and prevents the scraped material from sticking back to the surface of the grinding roller 30.

[0042] Specifically, the working principle of the cleaning device 4 for the vertical mill is as follows: The rocker arm device 3 drives the grinding roller 30 to rotate until its surface abuts against the grinding disc inside the housing 1. The lower end of the scraper 41 of the cleaning device 4 naturally abuts against the outer wall of the grinding roller 30, and the sealing strip 45 is inserted into the through-hole 44 to achieve sealing. At the same time, the air volume regulating valve of the air duct between the hot air blower and the fixed box 40 is adjusted to a suitable opening according to the viscosity of the material to be processed. The hydraulic cylinder of the rocker arm device 3 drives the rocker arm body to press down, so that the grinding roller 30 applies a preset grinding pressure to the grinding disc. The rotary motor drives the grinding roller 30 to rotate, and the vertical mill enters the normal grinding operation state.

[0043] During the rotation of the grinding roller 30, the scraper 41 moves relative to the outer wall of the grinding roller 30. Under the thrust of the compression spring 43, the scraper 41 always adheres to the outer wall of the grinding roller 30, directly scraping away loose material on the surface of the grinding roller 30 that has not formed a dense adhesive layer. The scraped material falls back onto the grinding disc to continue grinding, achieving real-time cleaning of loose material without the need to activate the hot air drying function. When the material adhering to the surface of the grinding roller 30 pushes the scraper 41 toward the fixed box 40 to retract (i.e., the sticky material adhering to the surface of the grinding roller 30 gradually accumulates to form a dense adhesive layer, which generates a pushing force on the scraper 41 toward the fixed box 40; the pushing force overcomes the elastic force of the compression spring 43 and pushes the scraper 41 upward), the bottom wall of the fixed box 40 delivers high-temperature air to the surface of the grinding roller 30 to dry the material, and the scraper 41 abuts against the outer wall of the grinding roller 30 to scrape away the dried material. The scraper 41 drives the balance plate 42 to move towards the inside of the fixed box 40, and compresses the compression spring 43; as the balance plate 42 moves upward, the sealing strip 45 moves upward synchronously with it and disengages from the opening 44, opening the opening 44, such as... Figure 4 The high-temperature air inside the fixed box 40 is blown evenly onto the adhesive layer on the surface of the grinding roller 30 through the port 44, which quickly dries the sticky material, reduces the stickiness of the material, and breaks the bonding force between the material and the outer wall of the grinding roller 30.

[0044] The vertical mill cleaning device 4 and its working method in this embodiment integrate a composite cleaning method of mechanical scraping and hot air drying, breaking the limitations of existing simple mechanical scraping. The hot air drying function is automatically activated and deactivated by the pushing force of the material on the scraper 41, requiring no manual intervention. The cleaning strategy is dynamically adjusted according to the degree of material adhesion on the surface of the grinding roller 30: loose materials are simply scraped mechanically to reduce energy consumption; for highly viscous and dense adhered layers, a composite mode of "hot air drying + carbide blade scraping" is activated to completely remove the adhered material that is difficult to remove by traditional methods, fundamentally solving the problem of material residue accumulation, ensuring the efficiency of grinding pressure transmission between the grinding roller 30 and the material, improving the grinding efficiency of the vertical mill, and reducing energy consumption. It is suitable for grinding different viscous materials such as cement, slag, coal powder, and clay, greatly improving the adaptability of the device. At the same time, the scraper 41, spring, sealing strip 45, and other components of the cleaning device 4 are all detachable, facilitating inspection and replacement and reducing equipment maintenance costs. The surface of the grinding roller 30 is free of uneven adhesion layers, ensuring the stability of the grinding roller 30's operation, reducing equipment vibration and wear, extending the service life of core components such as the grinding roller 30 and rocker arm, and improving the overall operational reliability of the vertical mill. At least one embodiment provides a method for operating the cleaning device 4 for a vertical mill, including the following steps: S1. The cleaning device 4 is installed at one end of the rocker arm device 3 near the grinding roller 30, so that the lower end of the scraper 41 naturally abuts against the outer wall of the grinding roller 30. The fixed box 40 is connected to the hot air blower. The vertical mill is started, and the rocker arm device 3 drives the grinding roller 30 to rotate and applies grinding pressure to the grinding disc. S2. Conventional scraping: During the rotation of the grinding roller 30, the scraper 41 moves relative to the outer wall of the grinding roller 30 to directly scrape off the loose material on the surface of the grinding roller 30 that has not formed a dense adhesive layer. S3, Adaptive Drying and Scraping: When the sticky material adhering to the surface of the grinding roller 30 forms a dense adhesion layer and pushes the scraper 41, the scraper 41 drives the balance plate 42 to move into the fixed box 40 and compresses the compression spring 43. The sealing strip 45 moves up with the balance plate 42 and disengages from the opening 44. The high-temperature air in the fixed box 40 is blown through the opening 44 onto the adhesion layer on the surface of the grinding roller 30 to quickly dry the sticky material and reduce the stickiness of the material. S4. Reset and scraping: After being dried by high-temperature air, the material's adhesion to the outer wall of the grinding roller 30 decreases. Under the elastic reset force of the compression spring 43, the balance plate 42 drives the scraper 41 to move down. The cutting edge of the scraper 41 completely scrapes away the dried material. At the same time, the sealing strip 45 is reinserted into the opening 44 to complete the seal and stop the high-temperature air conveying. S5. Cyclic operation: The grinding roller 30 rotates continuously, and steps S2-S4 are repeated to achieve real-time and adaptive cleaning of the material on the surface of the grinding roller 30. S6. Device shutdown: After the vertical mill is shut down, the rocker arm device 3 drives the grinding roller 30 to rotate to the non-working position and turns off the hot air blower. If maintenance is required, open the maintenance cover of the fixed box 40 to inspect and maintain the internal components of the cleaning device 4.

[0045] 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.

[0046] 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.

[0047] 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 cleaning device for a vertical mill, characterized in that, include: The housing (1) is vertically mounted on the frame (2); At least two rocker arm devices (3) are disposed on the outer wall of the housing (1) for driving the grinding roller (30) to rotate and flip; The cleaning device (4) is fitted to one end of the rocker arm device (3) near the grinding roller (30), including a fixed box (40) and at least two scrapers (41). The fixed box (40) is hollow inside and connected to a hot air blower. There is a gap between the two scrapers (41), and the scrapers (41) are raised and lowered at the bottom of the fixed box (40), with their lower ends abutting against the outer wall of the grinding roller (30). During operation, the scraper (41) adheres to the outer wall of the grinding roller (30) to scrape off the material on the surface of the grinding roller (30); When the material adhering to the surface of the grinding roller (30) pushes the scraper (41) to retract and move towards the fixed box (40), the bottom wall of the fixed box (40) delivers high-temperature air to the surface of the grinding roller (30) to dry the material, and the scraper (41) abuts against the outer wall of the grinding roller (30) to scrape off the dried material.

2. The cleaning device for a vertical mill as described in claim 1, characterized in that, The cleaning device (4) also includes a balance plate (42) and several compression springs (43), wherein the balance plate (42) is raised and lowered within a fixed box (40); The two ends of the compression spring (43) are fixed to the top wall of the fixed box (40) and the balance plate (42), respectively.

3. The cleaning device for a vertical mill as described in claim 2, characterized in that, The bottom wall of the fixed box (40) is provided with several openings (44) at equal intervals along the axial direction of the grinding roller (30). The bottom wall of the balance plate (42) is vertically fixed with a sealing strip (45) that is compatible with the opening (44). When the sealing strip (45) is inserted into the opening (44), it is suitable for sealing the opening (44).

4. The cleaning device for a vertical mill as described in claim 3, characterized in that, The lower end of the sealing strip (45) is trapezoidal, and the sidewall of the inclined side of the trapezoid is provided with a flexible coating, which is a rubber coating or a silicone coating.

5. The cleaning device for a vertical mill as described in claim 2, characterized in that, At least one scraper (41) is vertically fixed to the bottom wall of the balance plate (42), and a cutting edge is provided at one end of the scraper (41) near the grinding roller (30), the cutting edge being a wear-resistant cemented carbide cutting edge.

6. The cleaning device for a vertical mill as described in claim 5, characterized in that, The angle between a scraper (41) and the horizontal plane is α, and the angle range is 65°-75°.

7. The cleaning device for a vertical mill as described in claim 1, characterized in that, The fixed box (40) is connected to the hot air blower through a flexible air guide. The flexible air guide is equipped with an air volume regulating valve, which is used to regulate the air volume of high-temperature air delivered by the fixed box (40) to the surface of the grinding roller (30).

8. The cleaning device for a vertical mill as described in claim 1, characterized in that, The lower end face of the scraper (41) is an arc-shaped surface, and the curvature of the arc-shaped surface is adapted to the curvature of the outer wall of the grinding roller (30). The scraper (41) is made of high manganese steel wear-resistant material.

9. The cleaning device for a vertical mill as described in claim 2, characterized in that, The inner wall of the fixed box (40) is provided with a limiting groove, and the two sides of the balance plate (42) are provided with limiting sliders. The limiting sliders are slidably embedded in the limiting groove, and the limiting groove and the limiting sliders cooperate to limit the lifting direction of the balance plate (42).

10. The cleaning device for a vertical mill as described in claim 1, characterized in that, The rocker arm device (3) includes a rocker arm body and a drive assembly. The drive assembly includes a hydraulic cylinder and a rotary motor. The hydraulic cylinder is used to drive the rocker arm body to flip over, and the rotary motor is used to drive the grinding roller (30) to rotate. The cleaning device (4) is detachably fixed to one end of the rocker arm body near the grinding roller (30) by bolts.

11. A method for operating a cleaning device for a vertical mill, implemented based on the cleaning device for a vertical mill according to any one of claims 1-10, characterized in that, Includes the following steps: S1. The cleaning device (4) is installed at one end of the rocker arm device (3) near the grinding roller (30), so that the lower end of the scraper (41) naturally abuts against the outer wall of the grinding roller (30), the fixed box (40) is connected to the hot air blower, the vertical mill is started, the rocker arm device (3) drives the grinding roller (30) to rotate and applies grinding pressure to the grinding disc; S2, Conventional scraping: During the rotation of the grinding roller (30), the scraper (41) moves relative to the outer wall of the grinding roller (30) to directly scrape off the loose material on the surface of the grinding roller (30) that has not formed a dense adhesive layer; S3, Adaptive Drying and Scraping: When the sticky material adhering to the surface of the grinding roller (30) forms a dense adhesion layer and pushes the scraper (41), the scraper (41) drives the balance plate (42) to move into the fixed box (40) and compress the compression spring (43). The sealing strip (45) moves up with the balance plate (42) and disengages from the opening (44). The high-temperature air in the fixed box (40) is blown through the opening (44) to the adhesion layer on the surface of the grinding roller (30) to quickly dry the sticky material and reduce the stickiness of the material. S4, Reset and scraping: After the material is dried by high temperature air, the bonding force between the material and the outer wall of the grinding roller (30) is reduced. Under the elastic reset force of the compression spring (43), the balance plate (42) drives the scraper (41) to move down. The cutting edge of the scraper (41) completely scrapes away the dried material. At the same time, the sealing strip (45) is reinserted into the opening (44) to complete the seal and stop the high temperature air conveying. S5. Cyclic operation: The grinding roller (30) rotates continuously, and steps S2-S4 are repeated to achieve real-time and adaptive cleaning of the material on the surface of the grinding roller (30); S6. Device shutdown: After the vertical mill is shut down, the rocker arm device (3) drives the grinding roller (30) to rotate to the non-working position, and the hot air blower is turned off. If maintenance is required, open the maintenance cover of the fixed box (40) to inspect and maintain the internal components of the cleaning device (4).

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