Mullite-silicon carbide lining block with anchoring structure

Abstract

This utility model discloses a mullite-silicon carbide lining block with an anchoring structure, belonging to the technical field of rotary kiln lining structure. It includes a rotary kiln shell, an insulation layer on the inner wall of the rotary kiln shell, several mullite-silicon carbide bricks interlocked on the inner wall of the insulation layer, and anchoring components for anchoring the insulation layer and each mullite-silicon carbide brick. Through the interlocking of pre-embedded arc-shaped anchoring strips on the kiln shell with anchoring connecting seats within the mullite-silicon carbide bricks, and the threaded connection between the spiked bar and the inserted protrusion, a strong mechanical locking force is formed. This design tightly connects the heavy mullite-silicon carbide bricks, the lightweight insulation layer, and the kiln shell into a cohesive whole, effectively resisting the centrifugal force generated by the rotation of the rotary kiln, the impact force of materials, and long-term vibration, completely preventing the loosening and detachment of the mullite-silicon carbide bricks, and greatly improving the overall stability and reliability of the lining structure.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary kiln lining structure, specifically to a mullite-silicon carbide lining block with an anchoring structure. Background Technology

[0002] As a core thermal equipment in industries such as building materials, metallurgy, and chemicals, the stability and durability of the lining structure of rotary kilns directly affect the equipment's operating efficiency, energy consumption level, and service life. Mullite-silicon carbide bricks are widely used in the high-temperature zone lining of rotary kilns due to their excellent high-temperature strength, wear resistance, thermal shock resistance, and chemical corrosion resistance.

[0003] Traditional rotary kiln linings are often constructed by directly bonding or fixing them to the kiln shell using simple anchors. However, under the complex conditions of continuous kiln rotation, start-up, shutdown, and material scouring, traditional anchoring methods, with their simple structure, often have only one anchoring point, leading to stress concentration. Under long-term vibration, the anchors are prone to fatigue fracture, which can cause cracking of the brickwork.

[0004] Therefore, there is an urgent need to design an inner lining anchorage structure with high connection strength, good overall stability, excellent sealing performance, and adaptability to complex working conditions to solve the above-mentioned technical problems. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses a mullite-silicon carbide lining block with an anchoring structure.

[0006] The technical solution of this utility model is: a mullite-silicon carbide lining block with an anchoring structure, including a rotary kiln shell, an insulation layer disposed on the inner wall of the rotary kiln shell, several mullite-silicon carbide bricks disposed on the inner wall of the insulation layer and spliced ​​together, and an anchoring component for anchoring the insulation layer and each of the mullite-silicon carbide bricks.

[0007] The anchoring assembly includes several arc-shaped anchoring strips arranged circumferentially inside the rotary kiln shell and having spikes extending to the outside at their upper ends, and several anchoring connection seats arranged in each mullite-silicon carbide brick and corresponding one-to-one with the arc-shaped anchoring strips.

[0008] The anchoring connection seat is provided with a plug-in protrusion on the side opposite to the spike, and the plug-in protrusion is provided with a limiting recess. Each mullite-silicon carbide brick is provided with a channel that communicates with the outside at the corresponding limiting recess. The outer wall of the spike is threadedly connected to the limiting recess and the channel.

[0009] Furthermore, the upper end of the arc-shaped anchoring strip is provided with several connecting protrusions, which are embedded in the rotary kiln shell, and the gap between the connecting protrusions and the rotary kiln shell is filled with a high-temperature resistant adhesive.

[0010] Note: The connecting protrusion is made of high-temperature resistant alloy material integrated with the arc-shaped anchor strip. This structure can effectively prevent the arc-shaped anchor strip from shifting or falling off during long-term rotation and vibration of the rotary kiln. At the same time, by filling with high-temperature resistant adhesive, the sealing and structural stability between the connecting protrusion and the shell are further enhanced, preventing high-temperature gas or materials from seeping in through the gap.

[0011] Furthermore, the two splicing surfaces of the mullite-silicon carbide brick are respectively provided with a boss and a groove adapted to the boss, and the space between the boss and the groove between two adjacent mullite-silicon carbide bricks is filled with silicon carbide sealant.

[0012] Note: The dimensions of the boss and the groove must be strictly matched to ensure that two adjacent mullite-silicon carbide bricks can fit tightly together, reducing the gap between them. The silicon carbide sealant used for filling the gaps must be able to effectively prevent high-temperature material particles from leaking out from the gaps, preventing the internal structure of the lining blocks from being eroded, and ensuring the overall thermal insulation performance and service life of the lining.

[0013] Furthermore, each of the arc-shaped anchoring bars has several spikes, and the number of insert protrusions on the anchoring connector is the same as the number of corresponding spikes and the number of channels on the mullite-silicon carbide brick.

[0014] Note: The barbed rods, the insert protrusions on the anchoring connectors, and the holes on the mullite-silicon carbide bricks are designed with a one-to-one correspondence. This multi-point anchoring structure can evenly distribute the weight of the mullite-silicon carbide bricks onto the arc-shaped anchoring strips and the rotary kiln shell, avoiding excessive stress on a single anchoring point that could lead to breakage. It can further enhance the connection strength between the anchoring components and the mullite-silicon carbide bricks, the rotary kiln shell, and the insulation layer, ensuring the overall stability of the lining structure.

[0015] Furthermore, the inner wall of the channel is provided with a wear-resistant coating, which is a tungsten carbide coating.

[0016] Note: The wear-resistant coating can prevent the thread accuracy from decreasing due to wear on the inner wall of the hole, thus affecting the anchoring stability.

[0017] The beneficial effects of this utility model are:

[0018] (1) When the mullite-silicon carbide lining block with anchoring structure of this utility model is used, the arc-shaped anchoring strip pre-embedded on the kiln shell cooperates with the anchoring connection seat in the mullite-silicon carbide brick, and forms a strong mechanical locking force through the threaded connection of the spike and the plugged protrusion. This design tightly connects the heavy mullite-silicon carbide brick, the lightweight insulation layer and the kiln shell into a whole that works together to bear the force. It can effectively resist the centrifugal force generated by the rotation of the rotary kiln, the impact force of the material and the long-term vibration, and completely prevent the mullite-silicon carbide brick from loosening and falling off. It greatly improves the overall stability and reliability of the lining structure. At the same time, compared with;

[0019] (2) Interlocking bosses and grooves are set on the splicing surface of mullite-silicon carbide bricks to form the first physical barrier. Secondly, high-temperature resistant silicon carbide sealant is filled into the splicing gap to form the second tough chemical sealing layer. These two sealing measures can effectively prevent high-temperature materials and harmful gases from entering from the brick joints, protect the internal insulation layer and rotary kiln shell from corrosion, ensure the long-term heat insulation performance of the lining, reduce energy consumption, and extend the overall life of the equipment.

[0020] (3) Each arc-shaped anchor bar adopts a multi-point anchoring design with multiple spikes, which evenly distributes the weight and stress of the mullite-silicon carbide brick to a larger area and transfers it to the rotary kiln shell. This structure avoids the stress concentration problem caused by traditional single-point anchoring, significantly reduces the risk of anchoring components breaking due to excessive stress, and also prevents the mullite-silicon carbide brick from cracking around the anchoring point due to stress concentration. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a structural schematic diagram of the anchoring component of this utility model;

[0023] Figure 3 This is the utility model Figure 2 Enlarged view of point A in the image.

[0024] Among them, 1-rotary kiln shell, 2-insulation layer, 3-mullite-silicon carbide brick, 30-channel, 31-protrusion, 32-groove, 33-wear-resistant coating, 4-anchoring component, 40-spiking bar, 41-arc-anchoring strip, 410-connecting protrusion, 42-anchoring connection seat, 420-insertion protrusion, 421-limiting notch. Detailed Implementation

[0025] Example 1: As Figure 1As shown, a mullite-silicon carbide lining block with an anchoring structure includes a rotary kiln shell 1, an insulation layer 2 disposed on the inner wall of the rotary kiln shell 1, several mullite-silicon carbide bricks 3 disposed on the inner wall of the insulation layer 2 and spliced ​​together, and an anchoring component 4 for anchoring the insulation layer 2 and each mullite-silicon carbide brick 3, wherein the insulation layer 2 adopts the existing aluminum silicate ceramic insulation cotton layer.

[0026] like Figure 2 As shown, the anchoring assembly 4 includes 10 arc-shaped anchoring strips 41 arranged circumferentially inside the rotary kiln shell 1 and having spikes 40 extending to the outside at the upper end, and 10 anchoring connection seats 42 arranged in each mullite-silicon carbide brick 3 and corresponding one-to-one with the arc-shaped anchoring strips 41.

[0027] An anchoring connection seat 42 is provided with a plugging protrusion 420 on the side opposite to the spike 40. The plugging protrusion 420 is provided with a limiting recess 421. Each mullite-silicon carbide brick 3 is provided with a channel 30 that communicates with the outside at the corresponding limiting recess 421. The outer wall of the spike 40 is threadedly connected to the limiting recess 421 and the channel 30.

[0028] The upper end of the arc-shaped anchoring strip 41 is provided with three connecting protrusions 410. The connecting protrusions 410 are embedded in the rotary kiln shell 1, and the gap between the connecting protrusions 410 and the rotary kiln shell 1 is filled with a high-temperature resistant adhesive. The connecting protrusions 410 are made of a high-temperature resistant alloy material integrated with the arc-shaped anchoring strip 41. This structure can effectively prevent the arc-shaped anchoring strip 41 from shifting or falling off during the long-term rotation and vibration of the rotary kiln. At the same time, by filling with a high-temperature resistant adhesive, the sealing performance and structural stability between the connecting protrusions 410 and the shell are further enhanced, preventing high-temperature gas or materials from seeping in from the gap. The high-temperature resistant adhesive is an existing mullite-based high-temperature adhesive.

[0029] The two splicing surfaces of the mullite-silicon carbide brick 3 are respectively provided with a boss 31 and a groove 32 adapted to the boss 31. The gap between the boss 31 and the groove 32 between two adjacent mullite-silicon carbide bricks 3 is filled with silicon carbide sealant. The size design of the boss 31 and the groove 32 must be strictly matched to ensure that the two adjacent mullite-silicon carbide bricks 3 can fit tightly when spliced, reducing the splicing gap. The filled silicon carbide sealant must be able to effectively block high-temperature material particles from leaking from the splicing gap, prevent the internal structure of the lining block from being eroded, and ensure the overall thermal insulation performance and service life of the lining. The silicon carbide sealant adopts existing technology, such as Master Bond EP21 SC-1 type two-component epoxy resin system sealant.

[0030] Each arc-shaped anchoring strip 41 has three barbs 40, and the number of insert protrusions 420 on the anchoring connection seat 42 is the same as the number of corresponding barbs 40 and the number of holes 30 on the mullite-silicon carbide brick 3. The barbs 40, the insert protrusions 420 on the anchoring connection seat 42, and the holes 30 on the mullite-silicon carbide brick 3 are designed with a one-to-one correspondence. This multi-point anchoring structure can evenly distribute the weight of the mullite-silicon carbide brick 3 to the arc-shaped anchoring strip 41 and the rotary kiln shell 1, avoiding excessive stress on a single anchoring point that could lead to breakage. It can further improve the connection strength between the anchoring component 4 and the mullite-silicon carbide brick 3, the rotary kiln shell 1, and the insulation layer 2, ensuring the overall stability of the lining structure.

[0031] like Figure 3 As shown, the inner wall of the channel 30 is provided with a wear-resistant coating 33, which is a tungsten carbide coating. The wear-resistant coating 33 can prevent the inner wall of the channel 30 from being worn, which would reduce the thread accuracy and affect the anchoring stability.

[0032] In this embodiment, the mullite-silicon carbide lining block with anchoring structure serves as the outermost load-bearing structure of the rotary kiln shell 1, providing basic support for the entire lining system. The insulation layer 2 on its inner wall fills the space between the rotary kiln shell 1 and the mullite-silicon carbide bricks 3, forming a flexible buffer layer to mitigate the rigid impact between the rotary kiln shell 1 and the mullite-silicon carbide bricks 3 during kiln rotation. The inner mullite-silicon carbide bricks 3, as the core layer directly in contact with high-temperature materials, withstand the scouring, friction, and high-temperature erosion of the materials. Simultaneously, adjacent mullite-silicon carbide bricks 3 interlock through the splicing structure of bosses 31 and grooves 32, forming a continuous annular lining surface, transferring the force of a single mullite-silicon carbide brick 3 to adjacent bricks. The mullite-silicon carbide brick 3 provides overall load-bearing capacity for the inner lining. The anchoring component 4 is the core hub connecting the shell 1, the insulation layer 2, and the mullite-silicon carbide brick 3. Each arc-shaped anchoring strip 41 is evenly distributed along the circumference of the rotary kiln. The integrated alloy connecting protrusions 410 at the upper end of each arc-shaped anchoring strip 41 are embedded in the rotary kiln shell 1 to form an embedded positioning. Each mullite-silicon carbide brick 3 has a pre-set anchoring connection seat 42 that corresponds one-to-one with the arc-shaped anchoring strip 41. The insertion protrusion 420 on the anchoring connection seat is precisely aligned with the hole 30 of the brick body. After the spike 40 passes through the hole 30 from the outside, it is threadedly connected to the limiting notch 421 of the insertion protrusion 420 and the inner wall of the hole 30 to form a three-point anchoring point.

Claims

1. A mullite-silicon carbide lining block with an anchoring structure, characterized in that, It includes a rotary kiln shell (1), an insulation layer (2) disposed on the inner wall of the rotary kiln shell (1), several mullite-silicon carbide bricks (3) disposed on the inner wall of the insulation layer (2) and spliced ​​together, and an anchoring assembly (4) for anchoring the insulation layer (2) and each of the mullite-silicon carbide bricks (3). The anchoring assembly (4) includes several arc-shaped anchoring strips (41) arranged circumferentially inside the rotary kiln shell (1) and having a spike (40) extending to the outside at the upper end, and several anchoring connection seats (42) arranged in each mullite-silicon carbide brick (3) and corresponding one-to-one with the arc-shaped anchoring strips (41). The anchoring connection seat (42) is provided with a plug-in protrusion (420) on the side opposite to the spike (40). The plug-in protrusion (420) is provided with a limiting recess (421). Each mullite-silicon carbide brick (3) is provided with a channel (30) that communicates with the outside at the corresponding position of the limiting recess (421). The outer wall of the spike (40) is threadedly connected to the limiting recess (421) and the channel (30).

2. The mullite-silicon carbide lining block with anchoring structure according to claim 1, characterized in that, The upper end of the arc-shaped anchoring strip (41) is provided with several connecting protrusions (410), which are embedded in the rotary kiln shell (1), and the gap between the connecting protrusions (410) and the rotary kiln shell (1) is filled with high-temperature resistant adhesive.

3. The mullite-silicon carbide lining block with anchoring structure according to claim 1, characterized in that, The two splicing surfaces of the mullite-silicon carbide brick (3) are respectively provided with a boss (31) and a groove (32) adapted to the boss (31), and the space between the boss (31) and the groove (32) between two adjacent mullite-silicon carbide bricks (3) is filled with silicon carbide sealant.

4. The mullite-silicon carbide lining block with anchoring structure according to claim 1, characterized in that, Each of the arc-shaped anchor bars (41) has several barbs (40), and the number of insert protrusions (420) on the anchor connection seat (42) is the same as the number of corresponding barbs (40) and the number of channels (30) on the mullite-silicon carbide brick (3).

5. A mullite-silicon carbide lining block with an anchoring structure according to claim 1, characterized in that, The inner wall of the channel (30) is provided with a wear-resistant coating (33), which is a tungsten carbide coating.

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