Gradient composite wear-resistant lining plate structure of blast furnace distribution chute

Abstract

The utility model relates to the technical field of material distribution chutes, and particularly discloses a gradient composite wear-resistant lining plate structure of a blast furnace material distribution chute, and a first connecting structure adopts a matching mode of a threaded hole and a first bolt, so that a composite lining plate and a wear-resistant lining plate can be quickly disassembled and assembled through a standardized bolt. The anti-shearing capacity of a connecting interface is enhanced through the thread design of the inner wall of the mounting hole, and the problem that a traditional welding or buckling structure is prone to loosening and falling off can be solved under the high-frequency impact working condition. Meanwhile, the lining plate is allowed to be replaced on the premise that the chute body is not damaged through the connecting mode, the downtime is greatly shortened, and the chute is particularly suitable for online maintenance operation under the continuous production scene of the blast furnace.

Description

Technical Field

[0001] This application relates to the field of charging chute technology, and in particular to a gradient composite wear-resistant liner structure for a blast furnace charging chute. Background Technology

[0002] The blast furnace charging chute is one of the core components of the blast furnace smelting system. Its function is to evenly distribute the raw materials such as ore and coke charged from the top of the furnace to the throat section according to process requirements, ensuring the rational distribution of gas flow and efficient reduction of the burden within the blast furnace. As a critical channel connecting the top charging equipment and the furnace, the chute is subjected to extreme conditions of high temperature, high wear, and complex thermomechanical loads for a long time. Its performance directly determines the stability and lifespan of the blast furnace operation.

[0003] Traditional blast furnace charging chutes typically employ integral casting or segmented lining structures, primarily using high-chromium cast iron with a welded wear-resistant layer. These linings resist material impact and friction through their high-hardness surface, while the base material provides structural support, aiming to extend the service life of the chute itself. Conventional designs usually utilize homogeneous materials or a single wear-resistant layer structure, fixed to the inner wall of the chute by bolts or welding, forming a continuous protective layer to insulate against high temperatures and wear.

[0004] However, conventional liners have significant drawbacks in practical applications: because the inclination angle of the fabric chute is adjustable, the dynamic changes in the material's impact point at different angles lead to severely uneven wear distribution on the chute's inner wall. For example, at large inclination angles, material concentrates its impact on the front area of ​​the chute, while at small inclination angles, the middle and rear sections experience continuous frictional wear. The homogeneous structure of a single material cannot adapt to the differentiated wear requirements. Therefore, improvements to the fabric chute are needed to meet complex usage requirements. Utility Model Content

[0005] In order to overcome the problem of premature local failure of existing homogeneous liners under dynamic wear conditions, this application provides a gradient composite wear-resistant liner structure for blast furnace charging chutes.

[0006] This application provides a gradient composite wear-resistant liner structure for a blast furnace charging chute, employing the following technical solution:

[0007] A gradient composite wear-resistant liner structure for a blast furnace charging chute, wherein a composite liner and a wear-resistant liner are sequentially arranged on the charging chute body from near the charging end to away from the charging end. A first connection structure is provided between the composite liner, the wear-resistant liner and the charging chute body. An impact-resistant liner is provided on the surface of the composite liner. A second connection structure is provided between the impact-resistant liner and the charging chute body. The second connection structure allows the impact-resistant liner to be installed at any position on the surface of the composite liner.

[0008] By adopting the above technical solution, the gradient composite wear-resistant liner uses a split design to arrange the composite liner and wear-resistant liner in a gradient along the length of the chute. Combined with the adjustable position of the impact-resistant liner, it can dynamically adapt to the differentiated protection needs of high-impact areas (such as the front end at large angles) and conventional wear areas according to changes in the inclination angle of the fabric chute. The layered structure of the composite liner and wear-resistant liner is modularly fixed through the first connecting structure, allowing for independent replacement in case of local wear, significantly reducing maintenance costs. The impact-resistant liner, through the free positioning function of the second connecting structure, allows operators to adjust its coverage position based on real-time wear monitoring data, effectively solving the problem of premature local failure caused by changes in the impact point of traditional homogeneous liners, increasing the overall service life by approximately 2-3 times.

[0009] Optionally, the first connection structure includes multiple mounting holes formed on the bottom plate of the fabric chute body and a first bolt passing through the composite liner and the wear-resistant liner. The inner wall of the mounting hole is provided with threads, and the first bolt is adapted to the corresponding threads.

[0010] By adopting the above technical solution, the first connection structure uses a threaded hole and a first bolt to facilitate quick assembly and disassembly of the composite liner and wear-resistant liner using standardized bolts. The threaded design on the inner wall of the mounting hole enhances the shear resistance of the connection interface, avoiding the loosening and detachment problems that easily occur with traditional welding or snap-fit ​​structures under high-frequency impact conditions. Simultaneously, this connection method allows for liner replacement without damaging the chute body, significantly reducing downtime and making it particularly suitable for online maintenance operations in continuous blast furnace production scenarios.

[0011] Optionally, the second connection structure includes a connecting ear plate and a second bolt. The surface of the connecting ear plate corresponds to the inner sidewall of the impact-resistant liner and the fabric chute body, respectively. Each second bolt passes through the connecting ear plate and is fixedly connected to the bottom plate of the fabric chute body or the inner sidewall of the fabric chute body.

[0012] By adopting the above technical solution, the second connecting structure, through the cooperation of the connecting lug and the second bolt, enables the impact-resistant liner to be fixed at any position on the inner wall of the chute. The double-sided positioning design of the connecting lug forms a three-point force support, which can distribute the impact load to the chute's main frame structure, ensuring that the impact-resistant liner remains stably connected even under instantaneous large loads. This structure overcomes the technical bottleneck of traditional liner fixing positions being limited, allowing the impact-resistant liner to migrate in real time to the area of ​​most severe wear according to changes in the material trajectory, increasing the utilization rate of a single liner by more than 40%.

[0013] Optionally, the surface of the impact-resistant liner is fixed with multiple impact-resistant protrusions at intervals.

[0014] By adopting the above technical solution, the spaced impact-resistant protrusions on the surface of the impact-resistant liner achieve graded dissipation of impact energy through geometric optimization. Upon impact, the protrusions first undergo elastic deformation to absorb kinetic energy, and then guide the secondary distribution of material flow through grooves between adjacent protrusions, transforming concentrated impact into multi-point dispersed load. This design significantly reduces local impact pressure while decreasing the sliding friction distance between the material and the liner surface, thus significantly slowing down the surface wear rate.

[0015] Optionally, each of the impact-resistant protrusions is integrally connected to the surface of the impact-resistant liner.

[0016] By adopting the above technical solution, the integrated molding design of the impact-resistant protrusion and the liner body eliminates the interface stress concentration problem that exists when the protrusion is fixed by welding or bolting in the traditional way. When subjected to cyclic impact loads, the stress distribution uniformity of the integrated structure is greatly improved, avoiding protrusion fracture failure caused by the propagation of interface microcracks.

[0017] Optionally, the impact-resistant liner is integrally provided with guide plates on both sides of the feeding end and the unloading end of the fabric chute body, and the ends of the guide plates are inclined.

[0018] By adopting the above technical solution, the inclined guide plates at both ends of the impact-resistant liner, through fluid dynamics optimization, guide the high-speed material flow during the feeding process to smoothly transition to the central area of ​​the chute body. This design effectively suppresses the accumulation and rebound of material at the edge of the liner, reducing wear caused by secondary impacts in the edge area. At the same time, the integrated structure of the guide plate and the liner body forms a continuous protective interface, eliminating the gap wear hotspots present in traditional split-type guide devices, making the lifespan of the liner edge more consistent with that of the main body area.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] This solution achieves differentiated protection configurations for high-impact and conventional wear areas by installing composite liners, wear-resistant liners, and movable impact-resistant liners on the fabric chute body, combined with the synergistic effect of the first and second connecting structures. This allows the liner system to adjust the coverage position of the impact-resistant liners in real time according to changes in the chute's inclination angle, solving the problem of premature wear caused by dynamic offset of the impact point in traditional homogeneous liners. This significantly extends the overall service life of the liners and greatly reduces maintenance costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a gradient composite wear-resistant liner for a blast furnace charging chute in an embodiment of this application.

[0022] Figure 2 yes Figure 1A schematic diagram of the impact-resistant liner of the gradient composite wear-resistant liner of the blast furnace charging chute.

[0023] Reference numerals: 1. Fabric chute body; 11. Composite liner; 12. Wear-resistant liner; 13. Impact-resistant liner; 131. Impact-resistant protrusion; 132. Guide plate; 2. First connecting structure; 21. Mounting hole; 22. First bolt; 3. Second connecting structure; 31. Connecting ear plate; 32. Second bolt. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail below.

[0025] This application discloses a gradient composite wear-resistant liner structure for a blast furnace charging chute.

[0026] Reference Figure 1 and Figure 2 A gradient composite wear-resistant liner structure for a blast furnace charging chute is disclosed. The charging chute body 1 is provided with a composite liner 11 and a wear-resistant liner 12 in sequence from the end closer to the charging end to the end farther away from the charging end. A first connecting structure 2 is provided between the composite liner 11, the wear-resistant liner 12 and the charging chute body 1. An impact-resistant liner 13 is provided on the surface of the composite liner 11. A second connecting structure 3 is provided between the impact-resistant liner 13 and the charging chute body 1. The second connecting structure 3 allows the impact-resistant liner 13 to be installed at any position on the surface of the composite liner 11.

[0027] The impact-resistant liner 13 is made of tungsten carbide, and an enhanced nickel-based alloy laser cladding layer is set on the tungsten carbide to improve the surface hardness. The composite liner 11 is made of Al2O3 / ZrO2 metal ceramic composite layer, and the wear-resistant liner 12 is made of in-situ synthesized TiC particle-reinforced austenitic heat-resistant steel.

[0028] The gradient composite wear-resistant liner 12, through a split design, arranges the composite liner 11 and the wear-resistant liner 12 in a gradient along the length of the chute. Combined with the adjustable position of the impact-resistant liner 13, it can dynamically adapt to the differentiated protection needs of high-impact areas (such as the front end at large angles) and conventional wear areas according to changes in the inclination angle of the fabric chute. The layered structure of the composite liner 11 and the wear-resistant liner 12 is modularly fixed through the first connecting structure 2, allowing for independent replacement in case of local wear, significantly reducing maintenance costs. The impact-resistant liner 13, through the free positioning function of the second connecting structure 3, allows operators to adjust its coverage position based on real-time wear monitoring data, effectively solving the problem of premature local failure caused by changes in the impact point of traditional homogeneous liners, increasing the overall service life by approximately 2-3 times.

[0029] Reference Figure 1 and Figure 2The first connecting structure 2 includes multiple mounting holes 21 opened on the bottom plate of the fabric chute body 1 and a first bolt 22 penetrating the composite liner 11 and the wear-resistant liner 12. The inner wall of the mounting hole 21 is provided with threads, and the first bolt 22 is adapted to the corresponding threads.

[0030] The first connection structure 2 uses a threaded hole and a first bolt 22 for assembly, allowing the composite liner 11 and the wear-resistant liner 12 to be quickly assembled and disassembled using standardized bolts. The threaded design on the inner wall of the mounting hole 21 enhances the shear resistance of the connection interface, avoiding the loosening and detachment problems that are prone to occur in traditional welding or snap-fit ​​structures under high-frequency impact conditions. At the same time, this connection method allows for liner replacement without damaging the chute body, significantly reducing downtime and making it particularly suitable for online maintenance operations in continuous blast furnace production scenarios.

[0031] Reference Figure 1 and Figure 2 The second connecting structure 3 includes a connecting ear plate 31 and a second bolt 32. The surface of the connecting ear plate 31 corresponds to the inner sidewall of the impact-resistant liner plate 13 and the fabric chute body 1, respectively. Each second bolt 32 passes through the connecting ear plate 31 and is fixedly connected to the bottom plate of the fabric chute body 1 or the inner sidewall of the fabric chute body 1.

[0032] The second connecting structure 3, through the cooperation of the connecting lug 31 and the second bolt 32, enables the impact-resistant liner 13 to be fixed at any position on the inner wall of the chute. The double-sided positioning design of the connecting lug 31 forms a three-point force support, which can distribute the impact load to the chute body frame structure, so that the impact-resistant liner 13 remains stable even when subjected to instantaneous large loads. This structure breaks through the technical bottleneck of the traditional liner fixing position limitation, allowing the impact-resistant liner 13 to migrate to the area of ​​most severe wear in real time according to the material trajectory change, increasing the utilization rate of a single liner by more than 40%.

[0033] Reference Figure 1 and Figure 2 The impact-resistant liner 13 has multiple impact-resistant protrusions 131 fixed at intervals on its surface. These spaced-out protrusions 131 achieve graded dissipation of impact energy through optimized geometry. Upon impact, the protrusions first undergo elastic deformation to absorb kinetic energy, and then guide the secondary distribution of material flow through grooves between adjacent protrusions, transforming concentrated impact into multi-point dispersed load. This design significantly reduces local impact pressure while minimizing the sliding friction distance between the material and the liner surface, thus significantly slowing down the surface wear rate.

[0034] Each impact-resistant protrusion 131 is integrally connected to the surface of the impact-resistant liner 13. The integral molding design of the impact-resistant protrusion 131 and the liner body eliminates the problem of interface stress concentration that exists when protrusions are fixed by welding or bolting in the traditional way. When subjected to cyclic impact loads, the stress distribution uniformity of the integral structure is greatly improved, avoiding protrusion fracture failure caused by the propagation of interface microcracks.

[0035] Reference Figure 1 and Figure 2 The impact-resistant liner 13 has integrated guide plates 132 on both sides of the feeding and discharging ends of the material chute body 1. The ends of the guide plates 132 are sloped. Through fluid dynamics optimization, the sloped guide plates 132 at both ends of the impact-resistant liner 13 guide the high-speed material flow during the feeding process to smoothly transition to the middle area of ​​the chute body. This design effectively suppresses the accumulation and rebound of material at the edge of the liner, reducing wear caused by secondary impacts in the edge area. At the same time, the integrated structure of the guide plate 132 and the liner body forms a continuous protective interface, eliminating the gap wear hotspots present in traditional split-type guide devices, making the lifespan of the liner edge consistent with that of the main body area.

[0036] The implementation principle of the gradient composite wear-resistant liner structure for a blast furnace charging chute in this application embodiment is as follows: by setting a composite liner 11, a wear-resistant liner 12, and a movable impact-resistant liner 13 on the charging chute body 1, and combining the synergistic effect of the first connecting structure 2 and the second connecting structure 3, a differentiated protection configuration between the high-impact area and the conventional wear area is achieved. This allows the liner system to adjust the coverage position of the impact-resistant liner 13 in real time according to the change of the chute inclination angle, solving the problem of premature wear caused by the dynamic offset of the landing point of the traditional homogeneous liner, greatly improving the overall service life of the liner, and significantly reducing maintenance costs.

[0037] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gradient composite wear-resistant liner structure for a blast furnace charging chute, installed inside the charging chute body (1), characterized in that: The fabric chute body (1) is provided with a composite liner (11) and a wear-resistant liner (12) in sequence from the end near the material feeding end to the end away from the material feeding end. A first connecting structure (2) is provided between the composite liner (11), the wear-resistant liner (12) and the fabric chute body (1). An impact-resistant liner (13) is provided on the surface of the composite liner (11). A second connecting structure (3) is provided between the impact-resistant liner (13) and the fabric chute body (1). The second connecting structure (3) allows the impact-resistant liner (13) to be installed at any position on the surface of the composite liner (11).

2. The gradient composite wear-resistant liner structure for a blast furnace charging chute according to claim 1, characterized in that: The first connection structure (2) includes a plurality of mounting holes (21) on the bottom plate of the fabric chute body (1) and a first bolt (22) penetrating the composite liner (11) and the wear-resistant liner (12). The inner wall of the mounting hole (21) is provided with threads, and the first bolt (22) is adapted to the corresponding threads.

3. The gradient composite wear-resistant liner structure for a blast furnace charging chute according to claim 2, characterized in that: The second connection structure (3) includes a connecting ear plate (31) and a second bolt (32). The plate surface of the connecting ear plate (31) corresponds to the inner sidewall of the impact-resistant liner (13) and the fabric chute body (1). Each second bolt (32) passes through the connecting ear plate (31) and is fixedly connected to the bottom plate of the fabric chute body (1) or the inner sidewall of the fabric chute body (1).

4. The gradient composite wear-resistant liner structure for a blast furnace charging chute according to claim 1, characterized in that: The surface of the impact-resistant liner (13) is fixed with multiple impact-resistant protrusions (131) at intervals.

5. The gradient composite wear-resistant liner structure for a blast furnace charging chute according to claim 4, characterized in that: Each of the aforementioned impact-resistant protrusions (131) is integrally connected to the surface of the impact-resistant liner (13).

6. The gradient composite wear-resistant liner structure for a blast furnace charging chute according to claim 1, characterized in that: The impact-resistant liner (13) is integrally provided with guide plates (132) on both sides of the feeding end and the unloading end of the fabric chute body (1), and the end of the guide plate (132) is set with an inclined surface.

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