Vertical coal mill and vertical coal mill lining wear-resistant structure

Abstract

The utility model discloses a vertical coal mill and vertical coal mill lining wear -resisting structure, vertical coal mill lining wear -resisting structure includes coal mill cylinder and wear -resisting piece, the coal mill cylinder includes coal grinding area and non coal grinding area, wherein, the coal grinding area is used for grinding coal block, and the wear -resisting piece is evenly installed on the inner wall of coal grinding area through adhesive, through the fine polishing treatment of the coal grinding area of coal mill cylinder first, removes surface impurity and reaches ideal roughness, then utilizes the special ceramic special adhesive and accurately pastes high -hardness alumina wear -resisting ceramic piece, forms the wear -resisting ceramic piece layer of firm, prolongs the service life significantly, and the device structure is exquisite, and the installation is convenient, and the adaptation existing equipment reformation upgrade provides efficient solution scheme for the industry development, and helps production efficiency improvement and economic benefit growth.

Description

Technical Field

[0001] This utility model relates to the technical field of vertical coal mills, specifically a vertical coal mill and its wear-resistant lining structure. Background Technology

[0002] In the production processes of industries such as power, metallurgy, and cement, vertical coal mills play an irreplaceable role as core equipment for material grinding. However, during their long-term operation, the lining faces an extremely harsh working environment. As coal is ground inside the mill, it constantly experiences high-intensity impacts and collisions with the lining surface, while the grinding media also exert continuous friction on the lining during its movement. According to industry statistics, the average service life of traditional vertical coal mill linings under normal operating conditions is only 6 to 8 months, and in some harsh environments, the service life can even be shortened to 3 to 4 months.

[0003] Frequent liner replacements bring a series of thorny problems. From a cost perspective, each liner replacement not only requires the purchase of new liner components but also involves significant labor costs and production losses during equipment downtime. Calculations show that the direct costs (including liner materials and labor costs) and indirect costs (losses due to production stoppages) incurred annually by medium-sized enterprises due to liner replacements can reach several million yuan. From a production efficiency perspective, during liner replacements, the coal mill cannot operate normally, disrupting the entire production process, leading to production delays, product delivery delays, and severely impacting the company's market reputation and economic benefits.

[0004] Currently, common wear-resistant methods in the industry include using ordinary wear-resistant steel for the lining and spraying wear-resistant coatings onto the lining surface. However, ordinary wear-resistant steel has limitations in terms of hardness and wear resistance, making it difficult to withstand the impact and friction of coal blocks and grinding media for extended periods. Wear-resistant coatings are prone to peeling and failure under high-temperature and high-impact conditions, failing to achieve a durable and effective wear-resistant effect. Therefore, there is an urgent need for a new, efficient, and reliable wear-resistant technology for vertical coal mill linings to meet the growing demands of industrial production.

[0005] To address the aforementioned issues, a vertical coal mill and its wear-resistant lining structure are proposed. Utility Model Content

[0006] The purpose of this utility model is to provide a vertical coal mill and its internal anti-wear structure to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a vertical coal mill lining anti-wear structure, comprising a coal mill cylinder and wear-resistant plates, wherein the coal mill cylinder includes a coal grinding zone and a non-coal grinding zone, wherein the coal grinding zone is used for grinding coal blocks, and the wear-resistant plates are uniformly installed on the inner wall of the coal grinding zone by means of an adhesive.

[0008] The wear-resistant sheets are spaced 0.5mm to 1mm apart, and the adhesive is applied to a thickness of 0.5mm to 1mm.

[0009] Furthermore, the wear-resistant sheet includes an alumina wear-resistant ceramic sheet.

[0010] Furthermore, the adhesive includes a ceramic-specific adhesive, and the alumina wear-resistant ceramic sheet is uniformly adhered to the inner wall of the coal mill cylinder using the ceramic-specific adhesive.

[0011] Furthermore, the alumina wear-resistant ceramic sheet has dimensions of 100mm×100mm×30mm and a Mohs hardness of 8 to 9.

[0012] Furthermore, the inner wall roughness Ra of the coal grinding zone is between 40 and 75 micrometers.

[0013] A vertical coal mill, wherein the wear-resistant lining structure of the vertical coal mill is installed in the body of the vertical coal mill.

[0014] Analysis shows that this utility model provides a wear-resistant lining structure for a vertical coal mill, including a mill cylinder and wear-resistant plates. The mill cylinder includes a grinding zone and a non-grinding zone, wherein the grinding zone is used to grind coal lumps. The wear-resistant plates are uniformly installed on the inner wall of the grinding zone using an adhesive. The adhesive serves as a medium connecting the grinding zone and the wear-resistant plates, adhering the wear-resistant plates to the grinding zone, ensuring a tight fit between the wear-resistant plates and the mill cylinder, preventing them from falling off. When coal lumps and grinding media impact the surface of the wear-resistant plates... When the surface is exposed, the wear-resistant pads can effectively resist impact, converting the impact energy into their own small elastic deformation, thus preventing the coal mill body from being directly damaged by the impact. A gap of 0.5mm to 1mm is reserved between the wear-resistant pads 3 to cope with the thermal expansion and contraction of the material caused by temperature changes. To ensure the bonding effect, the coating thickness of the ceramic special adhesive is within 0.5mm to 1mm. During the friction process, the high hardness of the wear-resistant pads makes their surface less susceptible to wear, concentrating the wear on their own surface, thereby protecting the metal structure of the coal mill body.

[0015] Compared with the closest existing technology, the technical solution provided by this utility model has the following advantages: Current industry-standard wear-resistant methods include using ordinary wear-resistant steel for linings and spraying wear-resistant coatings on the lining surface. However, ordinary wear-resistant steel has limitations in hardness and wear resistance, making it difficult to withstand the impact and friction of coal blocks and grinding media for extended periods. Wear-resistant coatings are prone to peeling and failure under high-temperature and high-impact conditions, failing to achieve a durable and effective wear-resistant effect. This invention addresses this by connecting wear-resistant plates to the grinding zone of the coal mill cylinder using adhesive. Through innovative structural design and material application, it significantly enhances the wear resistance of the lining, extending its service life to 2-3 years, reducing replacement frequency, and lowering the overall maintenance cost of the equipment. Simultaneously, it ensures the coal mill maintains stable operation during long-term operation, improving production efficiency, reducing the risk of production interruptions due to equipment failure, creating greater economic and social benefits for enterprises, and promoting the efficient and stable application of vertical coal mill equipment in industrial production. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of an anti-wear structure for the inner lining of a vertical coal mill, as an example of this utility model.

[0017] In the diagram: 1. Non-grinding zone; 2. Grinding zone; 3. Wear-resistant plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0022] like Figure 1 As shown, this utility model provides a technical solution: a vertical coal mill lining anti-wear structure, including a coal mill cylinder and wear-resistant plates 3; the coal mill cylinder includes a coal grinding zone 2 and a non-coal grinding zone 21, wherein the coal grinding zone 2 is used to grind coal blocks, and the wear-resistant plates 3 are uniformly installed on the inner wall of the coal grinding zone 2 by means of adhesive.

[0023] In this embodiment, before attaching the wear-resistant sheet 3, the area on the side of the vertical coal mill body where the wear-resistant ceramic sheet needs to be attached is thoroughly polished using specialized polishing equipment, such as an electric grinder with sandpaper of different grits, following strict operating procedures. The primary goal of polishing is to completely remove surface oil, rust, scale, and other impurities to ensure surface cleanliness. Simultaneously, polishing creates a suitable surface roughness to increase adhesion. During the polishing process, the polishing force and direction must be strictly controlled to avoid damage to the coal mill body and ensure a smooth and uniform surface after polishing.

[0024] A gap of 0.5mm to 1mm is reserved between the wear-resistant plates 3 to cope with the thermal expansion and contraction of the material caused by temperature changes.

[0025] It should be noted that, in order to ensure the bonding effect, the coating thickness of the ceramic-specific adhesive should be within 0.5mm to 1mm.

[0026] Preferably, in this embodiment, the wear-resistant sheet 3 includes an alumina wear-resistant ceramic sheet; the adhesive includes a ceramic-specific adhesive, and the alumina wear-resistant ceramic sheet is uniformly adhered to the inner wall of the coal mill cylinder using the ceramic-specific adhesive.

[0027] Specifically, using specialized adhesive application tools, such as a brush or glue gun, apply ceramic-specific adhesive evenly to the sanded area. To ensure bonding effectiveness, after application, quickly attach the pre-prepared alumina wear-resistant ceramic sheets one by one to the adhesive area. During the attachment process, gently tap the wear-resistant ceramic sheets with a rubber mallet to encourage the adhesive to fully fill the gaps and expel air, ensuring that the wear-resistant ceramic sheets adhere tightly to the inner wall of the coal grinding area 2 without any air bubbles or gaps remaining.

[0028] The ceramic-specific adhesive possesses properties such as high strength, high temperature resistance (withstanding temperatures above 500℃), wear resistance, and good chemical stability.

[0029] The ceramic-specific adhesive plays a crucial role in ensuring a stable bond throughout the entire process. During coal mill operation, the internal temperature gradually rises, sometimes exceeding 300°C. The ceramic-specific adhesive possesses excellent high-temperature resistance; its molecular structure remains stable even at high temperatures, providing sustained and strong adhesion. This ensures a tight bond between the alumina wear-resistant ceramic sheets and the sides of the coal mill body, preventing the alumina wear-resistant ceramic sheets from detaching due to temperature changes, vibration, or other factors. Simultaneously, the ceramic-specific adhesive also possesses a degree of elasticity, cushioning the impact and vibration experienced by the alumina wear-resistant ceramic sheets, further enhancing the reliability and stability of the wear-resistant structure.

[0030] Preferably, the size of the alumina wear-resistant ceramic sheet is customized according to actual needs. In this embodiment, the specific size of the alumina wear-resistant ceramic sheet is 100mm × 100mm × 30mm. Since the wear-resistant sheet 3 is made of high-purity alumina ceramic material, its hardness reaches 8 to 9 on the Mohs scale, thus exhibiting excellent wear resistance and impact resistance. In this embodiment, after bonding, a pressure of 0.5 MPa to 1 MPa is applied to the surface of the alumina wear-resistant ceramic sheet. This can be achieved using a dedicated clamping device, such as a mechanical clamping fixture or a hydraulic clamping device. Simultaneously, the coal mill is placed in a suitable environment to allow the ceramic-specific adhesive to cure. Ideal curing conditions are an ambient temperature of 25-30°C and a relative humidity of 40-60%, with a curing time typically of 24-48 hours. During curing, environmental conditions and the condition of the wear-resistant ceramic sheet must be closely monitored to avoid external factors interfering with the adhesive curing process and to ensure a strong and stable bond.

[0031] Preferably, the inner wall roughness Ra of the coal grinding zone 2 is between 40 and 75 micrometers. During the grinding of the inner wall of the coal grinding zone 2, a suitable roughness is formed on the inner wall surface to increase adhesion and improve the reliability of the device.

[0032] A vertical coal mill, wherein the wear-resistant lining structure of the vertical coal mill is installed in the body of the vertical coal mill.

[0033] The specific process of using this structure to prevent wear on the inner wall of grinding zone 2 of a vertical coal mill is as follows: In the preparation stage, professional grinding equipment, such as an electric grinder with sandpaper of different grits, is selected. Following strict operating procedures, the area on the inner wall of the coal mill's grinding zone 2 that requires the adhesion of alumina wear-resistant ceramic sheets is thoroughly ground. Using specialized adhesive tools, such as a brush or glue gun, ceramic-grade adhesive is evenly applied to the ground area. After application, the pre-prepared alumina wear-resistant ceramic sheets are quickly and individually adhered to the adhesive area. A rubber mallet is used to gently tap the alumina wear-resistant ceramic sheets to ensure the adhesive fully fills the gaps and removes air. A specialized pressing device applies a pressure of 0.5-1 MPa to the surface of the alumina wear-resistant ceramic sheets. The coal mill is placed in a suitable environment to allow the ceramic-grade adhesive to cure. During the operation stage, once the vertical coal mill is in operation, the coal blocks inside are continuously crushed and ground by the grinding components. During this process, the coal blocks impact the inner lining surface at different speeds and angles. Simultaneously, grinding media such as steel balls and steel segments continuously rub against the inner lining under the action of the grinding disc. At this point, the wear-resistant structure of this invention begins to function. When coal and grinding media impact the surface of the alumina wear-resistant ceramic sheet, the alumina wear-resistant ceramic sheet effectively resists the impact, converting the impact energy into its own minute elastic deformation, thus preventing the coal mill body from being directly damaged by the impact. During the friction process, the high hardness of the alumina wear-resistant ceramic sheet makes its surface less prone to wear, concentrating the wear on its own surface, thereby protecting the metal structure of the coal mill body.

[0034] In summary, this utility model achieves the following technical effects: 1) This invention utilizes alumina wear-resistant ceramic sheets as the wear-resistant material 3, significantly improving the wear resistance and extending the service life of the structure. Through extensive monitoring and comparative analysis of practical application cases, the wear resistance of the vertical coal mill lining is significantly improved after adopting the wear-resistant device of this invention. Under the same operating conditions, compared with coal mills without this device, the wear of the lining is reduced by more than 70%, and the service life is extended from the original 6-8 months to 2-3 years, greatly reducing the frequency of lining replacement and providing strong support for the continuous production of enterprises.

[0035] 2) This invention uses a ceramic-specific adhesive as the medium for connecting the alumina wear-resistant ceramic sheets to the coal mill cylinder. The superior performance of the ceramic-specific adhesive ensures a stable connection between the wear-resistant ceramic sheets and the side of the coal mill body. Under long-term complex working conditions of high temperature, high impact, and high vibration, testing has shown that the bonding strength of the ceramic-specific adhesive remains at a high level, and the wear-resistant ceramic sheets have not experienced problems such as detachment or loosening. This effectively improves the overall reliability of the anti-wear device and reduces the risk of failure during equipment operation.

[0036] 3) This utility model uses adhesive to connect the wear-resistant sheet 3 to the coal mill cylinder, resulting in a simple structure. The installation process requires no large-scale structural modifications to the existing vertical coal mill; installation can be completed simply by following the established process steps, significantly reducing equipment modification costs. Simultaneously, due to the extended service life and improved reliability of the lining, equipment maintenance costs are significantly reduced, saving over 40% annually in maintenance expenses.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant lining structure for a vertical coal mill, characterized in that, Including the coal mill cylinder and wear-resistant plates; The coal mill cylinder includes a coal grinding zone and a non-coal grinding zone, wherein the coal grinding zone is used to grind coal blocks, and the wear-resistant plates are uniformly installed on the inner wall of the coal grinding zone by means of adhesive. The wear-resistant sheets are spaced 0.5mm to 1mm apart, and the adhesive is applied to a thickness of 0.5mm to 1mm.

2. The wear-resistant structure for the lining of a vertical coal mill according to claim 1, characterized in that, The wear-resistant sheet includes alumina wear-resistant ceramic sheet.

3. The wear-resistant structure for the lining of a vertical coal mill according to claim 2, characterized in that, The adhesive includes a ceramic-specific adhesive, and the alumina wear-resistant ceramic sheet is uniformly adhered to the inner wall of the coal mill cylinder using the ceramic-specific adhesive.

4. The wear-resistant structure for the lining of a vertical coal mill according to claim 3, characterized in that, The alumina wear-resistant ceramic sheet has dimensions of 100mm×100mm×30mm and a Mohs hardness of 8 to 9.

5. The anti-wear structure for the lining of a vertical coal mill according to claim 1, characterized in that, The inner wall roughness Ra of the coal grinding zone is between 40 and 75 micrometers.

6. A vertical coal mill, characterized in that, The wear-resistant lining structure of the vertical coal mill as described in any one of claims 1 to 5 is installed in the body of the vertical coal mill.

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