A composite metal ceramic lining for a coal mill roller

Abstract

The utility model provides a kind of mill roller lining of composite metal ceramic of coal mill, it is related to mill roller lining technical field, and it includes: mill roller lining body, the mill roller lining body contains lining base, high-chromium cast iron shock layer is embedded and fixed in mill roller lining body upper end inside, metal embedded net is welded on the high-chromium cast iron shock layer upper end, the metal embedded net inside is provided with honeycomb shape inlay groove, ceramic block is inlaid and combined by honeycomb shape inlay groove to the metal embedded net, the upper surface of ceramic block and metal embedded net is provided with nanometer fiber coating.The utility model solves the problem that mill roller lining of ceramic surface is impacted greatly by foreign matter mixed in the process of coal mill, and mill roller lining with poor impact resistance is prone to crack or breakage.

Description

Technical Field

[0001] This utility model relates to the field of grinding roller liner technology, specifically to a composite metal-ceramic grinding roller liner for a coal mill. Background Technology

[0002] Grinding roller liners, also commonly referred to as grinding roller sleeves or roller sleeves, are arc-shaped wear-resistant components installed on the outer surface of the grinding rollers in medium-speed coal mills. They are fixed to the grinding roller core by clamping blocks or bolts, and together with the grinding disc liner (also known as the grinding disc tile), they form the grinding area of ​​the coal mill. However, during the coal grinding process, foreign objects mixed in cause the ceramic-faced grinding roller liners to be subjected to significant impacts. Grinding roller liners with poor impact resistance are prone to cracking or breakage and becoming unusable. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a composite metal-ceramic grinding roller liner for coal mills is provided to solve the problem that foreign matter mixed in during the coal grinding process causes the ceramic surface of the grinding roller liner to be subjected to a large impact, and grinding roller liners with poor impact resistance are prone to cracking or breakage and scrapping.

[0004] To achieve the above objectives, a composite metal-ceramic grinding roller liner for a coal mill is provided, comprising: a grinding roller liner body, wherein the grinding roller liner body contains a liner base layer. A high-chromium cast iron impact layer is embedded and fixed on the inner side of the upper end of the grinding roller liner body. A metal mesh is welded to the upper end of the high-chromium cast iron impact layer. A honeycomb groove is provided on the inner side of the metal mesh. A ceramic block is embedded in the metal mesh through the honeycomb groove. A nanofiber coating is provided on the upper surface of the ceramic block and the metal mesh.

[0005] Furthermore, the lower end face of the grinding roller liner body is provided with a snap-fit ​​groove; and the snap-fit ​​groove is snapped into the grinding roller surface of the coal mill.

[0006] Furthermore, fixing holes are provided on the left and right sides of the grinding roller liner body.

[0007] Furthermore, the upper arc surface of the grinding roller liner body is coated with a nanofiber coating.

[0008] Furthermore, the nanofiber coating is filled with modified ceramic powder.

[0009] Furthermore, the high-chromium cast iron anti-reflective layer is embedded and welded into the upper groove of the lining base layer.

[0010] Furthermore, the inner side of the metal mesh has interlaced, equidistant, honeycomb-shaped grooves.

[0011] Furthermore, a hexagonal ceramic block is inlaid and fixed within the honeycomb-shaped groove.

[0012] The beneficial effects of this utility model are as follows: the composite metal-ceramic grinding roller liner of this utility model utilizes ceramic blocks, metal mesh, and a high-chromium cast iron impact layer to form an inlaid composite wear-resistant liner structure. By embedding multiple ceramic blocks into the metal mesh, a continuous phase is formed with the high-chromium cast iron impact layer, achieving a grinding roller liner surface that combines hardness and toughness. This avoids the situation where an intact ceramic liner surface is easily broken and cracked upon impact, effectively blocking the crack propagation path of the composite metal-ceramic grinding roller liner. Through the nanofiber coating on the surface of the grinding roller liner, the toughening effect of the ceramic blocks and the high-chromium cast iron impact layer is further enhanced, inhibiting the propagation of microcracks and improving the overall impact resistance and service life of the composite metal-ceramic grinding roller liner. Attached Figure Description

[0013] Figure 1 This is a front view structural diagram of the composite metal-ceramic grinding roller liner of a coal mill according to an embodiment of the present invention.

[0014] Figure 2 This is a cross-sectional structural diagram of the composite metal-ceramic grinding roller liner of a coal mill according to an embodiment of the present invention.

[0015] Figure 3 This is a partial cross-sectional structural diagram of the composite lining according to an embodiment of the present invention.

[0016] Figure 4 This is a top view of the metal mesh structure according to an embodiment of the present invention.

[0017] In the figure: 1. Grinding roller liner body; 11. Snap-fit ​​groove; 12. Fixing hole; 13. Liner base layer; 2. Nanofiber coating; 3. Ceramic block; 4. Metal mesh; 41. Honeycomb groove; 5. High chromium cast iron impact layer. Detailed Implementation

[0018] Reference Figures 1 to 4 As shown, this utility model provides a composite metal-ceramic grinding roller liner for a coal mill, comprising: a grinding roller liner body 1, wherein the grinding roller liner body 1 contains a liner base layer 13. A high-chromium cast iron impact layer 5 is embedded and fixed on the inner side of the upper end of the grinding roller liner body 1. A metal mesh 4 is welded to the upper end of the high-chromium cast iron impact layer 5. A honeycomb groove 41 is provided on the inner side of the metal mesh 4. A ceramic block 3 is inlaid and composited in the metal mesh 4 through the honeycomb groove 41. A nanofiber coating 2 is provided on the upper surface of the ceramic block 3 and the metal mesh 4.

[0019] The composite metal-ceramic grinding roller liner of the coal mill consists of multiple ceramic blocks 3 embedded in a metal mesh 4, forming a continuous phase with the high-chromium cast iron impact layer 5. This achieves a grinding roller liner surface that combines hardness and toughness, preventing the intact ceramic liner surface from easily breaking and cracking under impact, and effectively blocking the crack propagation path of the composite metal-ceramic grinding roller liner. The nanofiber coating 2 on the surface of the grinding roller liner further enhances the toughening effect of the ceramic blocks and the high-chromium cast iron impact layer, inhibits the propagation of microcracks, and improves the overall impact resistance and service life of the composite metal-ceramic grinding roller liner.

[0020] In this embodiment, a snap-fit ​​groove 11 is provided on the lower end face of the grinding roller liner body 1; and the snap-fit ​​groove 11 is snapped into the grinding roller surface of the coal mill. Fixing holes 12 are provided on the left and right sides of the grinding roller liner body 1.

[0021] In a preferred embodiment, multiple grinding roller liner bodies 1 are installed in a ring on the surface of the coal mill grinding roller to protect the grinding roller core. The fixing holes 12 are used to fix the grinding roller liner bodies 1 to the grinding roller core with bolts.

[0022] In this embodiment, the upper arc surface of the grinding roller liner body 1 is coated with a nanofiber coating 2. The nanofiber coating 2 is filled with modified ceramic powder.

[0023] As a preferred embodiment, the nanofiber coating 2, which is a coating composed of nano-modified ceramic powder and ceramic fiber, serves as the surface layer of the grinding roller liner body 1. It can delay the wear of the ceramic block 3, and adjust the local thickness of the coating according to the degree of local wear, thereby further enhancing the toughening effect of the ceramic block 3 and the high-chromium cast iron impact layer 5, inhibiting the propagation of microcracks, and improving the overall impact resistance and service life of the composite metal ceramic grinding roller liner.

[0024] In this embodiment, the high-chromium cast iron impact layer 5 is embedded and welded into the upper groove of the lining base layer 13. The inner side of the metal mesh 4 has honeycomb-shaped grooves 41 arranged in an alternating and equidistant pattern. Hexagonal ceramic blocks 3 are inlaid and fixed in the honeycomb-shaped grooves 41.

[0025] As a preferred implementation method, the high-chromium cast iron impact layer 5 absorbs some energy through plastic deformation, thus providing an impact buffering effect. The inlay composite method of the metal mesh 4 and the ceramic block 3 mimics the "brick and mortar" structure of natural materials such as seashells, eliminating the need for a complete ceramic layer. Instead, it forms a continuous phase with the high-chromium cast iron impact layer 5. When subjected to impact, the crack propagation path is continuously blocked by the metallic phase of the high-chromium cast iron impact layer 5, preventing catastrophic breakage.

[0026] This utility model of composite metal-ceramic grinding roller liners for coal mills effectively solves the problem of foreign matter mixed in during coal grinding, which causes significant impact on the ceramic surface of the grinding roller liners. Grinding roller liners with poor impact resistance are prone to cracking or breakage and becoming unusable. It achieves a grinding roller liner surface that combines hardness and toughness, preventing the intact ceramic liner from easily breaking and cracking upon impact, effectively blocking the crack propagation path of the composite metal-ceramic grinding roller liners. Furthermore, it enhances the toughening effect of the ceramic block and the high-chromium cast iron impact layer, inhibiting the propagation of microcracks and improving the overall impact resistance and service life of the composite metal-ceramic grinding roller liners. It is suitable for composite metal-ceramic grinding roller liners for coal mills.

Claims

1. A composite metal-ceramic grinding roller liner for a coal mill, comprising: The grinding roller liner body (1), wherein the grinding roller liner body (1) contains a liner base layer (13), is characterized in that: The upper inner side of the grinding roller liner body (1) is embedded with a high chromium cast iron impact layer (5), and a metal mesh (4) is welded to the upper end of the high chromium cast iron impact layer (5). A honeycomb groove (41) is provided on the inner side of the metal mesh (4). A ceramic block (3) is inlaid and composited in the metal mesh (4) through the honeycomb groove (41). A nanofiber coating (2) is provided on the upper surface of the ceramic block (3) and the metal mesh (4).

2. The grinding roller liner of a coal mill composite metal-ceramic according to claim 1, characterized in that, The lower end face of the grinding roller liner body (1) is provided with a snap-fit ​​groove (11); and the snap-fit ​​groove (11) is snapped into the grinding roller surface of the coal mill.

3. The grinding roller liner of a coal mill composite metal-ceramic according to claim 1, characterized in that, The grinding roller liner body (1) has fixing holes (12) on its left and right sides.

4. The grinding roller liner of a coal mill composite metal-ceramic according to claim 1, characterized in that, The upper arc surface of the grinding roller liner body (1) is coated with a nanofiber coating (2).

5. The composite metal-ceramic grinding roller liner for a coal mill according to claim 1, characterized in that, The nanofiber coating (2) is filled with modified ceramic powder.

6. The grinding roller liner of a coal mill composite metal-ceramic according to claim 1, characterized in that, The high-chromium cast iron anti-reflective layer (5) is embedded and welded into the upper groove of the lining base layer (13).

7. The composite metal-ceramic grinding roller liner for a coal mill according to claim 1, characterized in that, The inner side of the metal mesh (4) has interlaced, equidistant, honeycomb-shaped grooves (41).

8. The grinding roller liner of a coal mill composite metal-ceramic according to claim 1, characterized in that, A hexagonal ceramic block (3) is inlaid and fixed in the honeycomb groove (41).

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