Corrosion-resistant high-chromium ball for thermal power plant

Abstract

The utility model discloses a kind of corrosion-resistant high-chromium balls for thermal power plant, it relates to high-chromium ball technical field, including sphere, the outside surface of the sphere is equipped with convex point mechanism and boss mechanism, the convex point mechanism and boss mechanism are unevenly distributed setting;The corrosion-resistant high-chromium ball for the thermal power plant;Unevenly distributed convex point mechanism and boss mechanism are set on the surface of sphere, effectively avoid symmetrical stress concentration, improve the stability and wear resistance of sphere;Irregular distribution of convex point mechanism and boss mechanism makes irregular collision path when sphere rolls, significantly improves grinding efficiency;Convex point and boss adopt double-layer structure design, outer high-hardness layer ensures wear resistance, inner high-toughness layer resists impact force, internal high-resistance body reduces grain boundary brittleness by controlling sulfur and phosphorus content, overall improves the impact resistance and corrosion resistance of sphere;All convex point and boss edge adopt fillet layer design, effectively reduce stress concentration, prolong the service life of sphere.

Description

Technical Field

[0001] This utility model relates to the field of high-chromium ball technology, specifically a corrosion-resistant high-chromium ball for thermal power plants. Background Technology

[0002] In coal-fired power generation systems, the coal mill is a key piece of equipment, and the performance of its grinding media directly affects the economic efficiency and reliability of the unit's operation. While the widely used high-chromium cast iron grinding balls possess high hardness, several technical bottlenecks have been revealed during long-term operation.

[0003] Existing high-chromium balls are mostly smooth in surface, which can easily lead to symmetrical stress concentration during long-term grinding, resulting in uneven wear of the balls, increased breakage rate, and affecting grinding efficiency and equipment lifespan.

[0004] In addition, traditional high-chromium balls are also insufficient in terms of corrosion resistance and impact resistance, making it difficult to meet the long-term stable operation requirements of thermal power plants under complex operating conditions. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a corrosion-resistant high-chromium ball for thermal power plants, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a corrosion-resistant high-chromium ball for thermal power plants, comprising a ball, wherein the outer surface of the ball is provided with a protrusion mechanism and a bump mechanism, wherein the protrusion mechanism and the bump mechanism are unevenly distributed, and the protrusion mechanism and the bump mechanism are used to enhance the structural strength and impact force of the ball.

[0007] Furthermore, the convex mechanism includes convex point one, convex point two, and convex point three with successively increasing diameters, and the three are irregularly distributed along the surface of the sphere.

[0008] Furthermore: the bump mechanism includes bump one, bump two and bump three with successively increasing area, and the three are irregularly distributed along the surface of the sphere and integrally formed with the sphere.

[0009] Furthermore: the surface of the sphere is provided with a flat groove, which is a cross-section of the surface of the sphere.

[0010] Furthermore, the three protrusions are each divided into two layers: an outer layer with high hardness and an inner layer with high toughness. The interior of the sphere is a high-resistance material.

[0011] Furthermore, both the convex point mechanism and the convex block mechanism have rounded corner layers at their edges.

[0012] This invention provides a corrosion-resistant high-chromium ball for thermal power plants. Compared with the prior art, it has the following advantages:

[0013] This thermal power plant uses corrosion-resistant high-chromium balls. The surface of the balls features unevenly distributed bump and protrusion mechanisms, effectively avoiding symmetrical stress concentration and improving the balls' stability and wear resistance. The irregular distribution of these bumps creates irregular collision paths during rolling, significantly improving grinding efficiency. The bumps and protrusions employ a double-layer structure: an outer high-hardness layer ensures wear resistance, an inner high-toughness layer resists impact, and an internal high-resistance body reduces grain boundary brittleness by controlling sulfur and phosphorus content, thus comprehensively improving the balls' impact resistance and corrosion resistance. All bump and protrusion edges are rounded, effectively reducing stress concentration and extending the balls' service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of a partial cross-section of the sphere of this utility model;

[0016] Figure 3 This is a schematic diagram of a partial cross-section of the sphere of this utility model;

[0017] Figure 4 for Figure 2 Enlarged structural diagram at point A;

[0018] Figure 5 for Figure 3 A schematic diagram of the structure at point B.

[0019] In the diagram: 1. Sphere; 2. Protrusion 1; 21. Protrusion 2; 22. Protrusion 3; 3. Bump 1; 31. Bump 2; 32. Bump 3; 4. Flat groove; 51. High hardness layer; 52. High toughness layer; 53. High resistance layer; 6. Rounded corner layer. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-5This utility model provides a technical solution: a corrosion-resistant high-chromium ball for thermal power plants; the high-chromium ball is a wear-resistant grinding medium used in coal mills (such as steel ball mills and medium-speed mills) in thermal power plants, mainly composed of high-chromium cast iron or high-chromium alloy steel, suitable for grinding hard materials such as coal and slag. This is existing known technology and will not be described in detail here; specifically, it consists of a ball 1, on the outer surface of the ball 1, a protrusion mechanism is provided, and a bump mechanism is provided on the outer surface of the ball 1. The distribution of the protrusion mechanism is uneven, which can effectively avoid symmetrical stress concentration. The bump mechanism can improve the impact force of the ball 1 itself, and the overall structure of the ball 1 can be strengthened through the bump mechanism, thereby making the ball 1 more durable and more effective in grinding.

[0022] The protrusion mechanism includes protrusion 1 (2), protrusion 2 (21), and protrusion 3 (22). The diameters of protrusion 1 (2), protrusion 2 (21), and protrusion 3 (22) are arranged from small to large, and the distribution of protrusion 1 (2), protrusion 2 (21), and protrusion 3 (22) is uneven. They are unevenly distributed along the surface of the sphere 1 in an irregular pattern. This can effectively reduce symmetrical stress concentration and improve the stability of the sphere 1 itself. Furthermore, the irregular distribution of protrusion 1 (2), protrusion 2 (21), and protrusion 3 (22) allows the sphere 1 to collide along an irregular path when rolling, thereby improving the grinding efficiency.

[0023] The bump mechanism includes bump 1 (3), bump 2 (31), and bump 3 (32). The area of ​​bump 1 (3), bump 2 (31), and bump 3 (32) increases from small to large. The distribution of bump 1 (3), bump 2 (31), and bump 3 (32) is uneven. They are unevenly distributed along the surface of the sphere 1 in an irregular pattern. This makes the impact area more dispersed and increases the number of times it comes into contact with the material. Bump 1 (3), bump 2 (31), and bump 3 (32) are integrally formed with the sphere 1, which improves the overall rigidity of the sphere 1 and makes the surface more wear-resistant and durable.

[0024] A flat groove 4 is provided on the surface of the sphere 1. The flat groove 4 is a cross-section on the surface of the sphere 1. The flat groove 4 can make the collision distance between the spheres closer when they meet, thereby increasing the interaction force between the spheres 1 and forming a shear force between the material and the sphere 1, so that the material can be ground more efficiently.

[0025] The bumps 1, 2, 21, and 3, 22 are all set in two layers. The outermost layer is a high-hardness layer 51, and the innermost layer is a high-toughness layer 52. The interior of the sphere 1 is a high-resistance body 53. Specifically, the high-hardness layer 51 is made of high-chromium cast iron, which can improve hardness; the high-toughness layer 52 is made of low-carbon steel, which can resist impact; and the high-resistance body 53 inside the sphere 1 reduces grain boundary brittleness and improves impact resistance by controlling sulfur (S) and phosphorus (P) to <0.05%.

[0026] The edges of protrusions 1-2, 21-2, 22-3, 3-3, 3-3, and 3-3 are all provided with rounded corner layers 6, which can reduce stress concentration.

Claims

1. A corrosion-resistant high-chromium ball for thermal power plants, comprising a ball (1), characterized in that: The outer surface of the sphere (1) is provided with a protrusion mechanism and a bump mechanism. The protrusion mechanism and the bump mechanism are unevenly distributed and are used to enhance the structural strength and impact force of the sphere (1).

2. The corrosion-resistant high-chromium ball for thermal power plants according to claim 1, characterized in that: The protrusion mechanism includes protrusion one (2), protrusion two (21) and protrusion three (22) with increasing diameters, and the three are irregularly distributed along the surface of the sphere (1).

3. The corrosion-resistant high-chromium ball for thermal power plants according to claim 2, characterized in that: The bump mechanism includes bump one (3), bump two (31) and bump three (32) with increasing area, and the three are irregularly distributed along the surface of the sphere (1) and integrally formed with the sphere (1).

4. The corrosion-resistant high-chromium ball for thermal power plants according to claim 2, characterized in that: The surface of the sphere (1) is provided with a flat groove (4), which is a cross-section of the surface of the sphere (1).

5. The corrosion-resistant high-chromium ball for thermal power plants according to claim 2, characterized in that: The first protrusion (2), the second protrusion (21) and the third protrusion (22) are all divided into two layers: the outer layer is a high-hardness layer (51) and the inner layer is a high-toughness layer (52). The inside of the sphere (1) is a high-resistance body (53).

6. The corrosion-resistant high-chromium ball for thermal power plants according to claim 2, characterized in that: Both the convex point mechanism and the convex block mechanism have rounded corner layers (6) at their edges.

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