Modular refractory brick for rotary kilns

Abstract

The utility model discloses a modularization firebrick for rotary kiln, including brick body and casing, the casing is wrapped with the brick body periphery, the casing surface position is equipped with the accommodation slot used for the installation of brick body. The utility model discloses a casing is adopted, before the transportation and the handling of firebrick, personnel can selectively directly separate brick body or connect the brick body with the casing, because the surface structure of brick body is intact and does not have the part of convex and grooving, can effectively avoid the brick body fracture caused by knock, and then guarantee its soundness, make subsequent better build operation, and select and connect with the casing, then need a certain trepanning on the brick body, at this moment, the brick body will be wrapped by the casing, also can avoid the trepanning part exposure, and then reduce the influence of knock, also can guarantee the intact structure, have the advantages such as good brick body protection effect, high brick body soundness.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln refractory brick technology, and more specifically, to modular refractory bricks for use in rotary kilns. Background Technology

[0002] Rotary kilns are equipment used in the metallurgical industry for the magnetization roasting of lean iron ore in steel plants. They are mainly used for calcining cement clinker and are divided into two main categories: dry process cement kilns and wet process cement kilns. When constructing a rotary kiln, refractory bricks need to be adhered to the outer wall of the kiln to surround the kiln and increase its heat preservation performance.

[0003] The existing publicly available technology, application number CN202022860492.5, describes a modular refractory brick. This brick features an internal skeleton that enhances its strength. Furthermore, when subjected to external impact, multiple refractory bricks are joined together and connected via limiting rods inserted into the first and second limiting holes, thus linking them together. This design allows the external impact force to be distributed across multiple refractory bricks, improving the overall support strength and extending the service life of the refractory brick.

[0004] However, the above-mentioned patent still has certain drawbacks in use: it uses multiple sets of mortise and tenon blocks to realize the splicing operation of refractory bricks, but the mortise and tenon blocks are very easy to be bumped and broken during transportation and handling, which reduces the protection effect on refractory bricks and reduces their integrity rate, which is not conducive to the subsequent construction and use of rotary kilns, and there is room for improvement.

[0005] There are currently no effective solutions to the problems in the relevant technologies. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides modular refractory bricks for rotary kilns, which have the advantages of convenient assembly, good brick protection effect, and high brick integrity, thereby solving the problems mentioned in the background technology.

[0007] To achieve the advantages of convenient assembly, good brick protection, and high brick integrity, the specific technical solution adopted by this utility model is as follows: Modular refractory bricks for rotary kilns include a brick body and a shell. The outer periphery of the brick body is wrapped with the shell. A receiving groove for installing the brick body is opened on the surface of the shell. A slot is opened at the middle of the top of the receiving groove.

[0008] Furthermore, a locking block is installed at the middle position of the bottom of the housing.

[0009] Furthermore, several sets of docking grooves are symmetrically formed on one side surface of the housing.

[0010] Furthermore, several sets of mating strips are symmetrically installed on the other side surface of the housing.

[0011] Furthermore, several sets of fastening holes are symmetrically opened on both sides of the shell surface.

[0012] Furthermore, the card block and the card slot are located on the same axis.

[0013] Furthermore, the shell depth is the same as the brick thickness.

[0014] Furthermore, fastening holes are also provided on the surface of the brick at positions corresponding to the fastening holes.

[0015] Compared with the prior art, this utility model provides modular refractory bricks for rotary kilns, which have the following advantages: (1) By adopting a shell, the present invention allows personnel to choose to directly transport or handle the refractory bricks separately or connect the bricks to the shell before transporting and handling them. Since the surface structure of the bricks is intact and there are no protrusions or grooves, it can effectively prevent the bricks from breaking due to bumps, thus ensuring their integrity and facilitating subsequent assembly operations. If the bricks are connected to the shell, certain holes need to be made in the bricks. At this time, the bricks will be enclosed by the shell, which can also prevent the holes from being exposed, thereby reducing the impact of bumps and ensuring the integrity of the structure. It has the advantages of good brick protection and high brick integrity.

[0016] (2) This utility model adopts a docking groove, docking strip, card block and card slot. Personnel can connect the docking groove and docking strip on the outer surface of the shell to realize the horizontal connection operation between bricks. On this basis, by inserting the card block at the bottom of the shell into the card slot at the top, the vertical connection operation of multiple bricks can be realized. The two sets of structures can be used together to effectively improve the overall connection efficiency and facilitate better use later. Then, personnel can attach the entire shell to cement, etc., to realize the construction operation of the rotary kiln. It has the advantage of convenient assembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the modular refractory brick for rotary kilns proposed in this utility model. Figure 2This is a schematic diagram of the structure of the shell of this utility model; Figure 3 This is a schematic diagram of the brick structure of this utility model; Figure 4 This is a schematic diagram of an embodiment of the present invention.

[0019] In the picture: 1. Brick body; 2. Shell; 3. Connecting groove; 4. Slot; 5. Receiving groove; 6. Fastening hole; 7. Connecting strip; 8. Locking block. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0021] According to an embodiment of the present invention, modular refractory bricks for rotary kilns are provided.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4As shown, the modular refractory brick for rotary kilns according to an embodiment of this utility model includes a brick body 1 and a shell 2. The shell 2 surrounds the outer periphery of the brick body 1. A receiving groove 5 for installing the brick body 1 is formed on the surface of the shell 2. A slot 4 is formed in the middle of the top of the receiving groove 5. The brick body 1 is made of a special refractory material for rotary kilns, such as high-alumina or magnesia-alumina refractory bricks. It is the core layer that directly contacts the high-temperature materials in the kiln and is in the shape of regular blocks, adapting to the curvature of the inner wall of the rotary kiln. The shell 2 is a high-strength heat-resistant structural component, such as Q345 heat-resistant steel or wear-resistant cast iron. It is in the shape of blocks that match the brick body 1. Its inner surface A receiving groove 5 is formed along the circumference. The receiving groove 5 has a groove structure with smooth walls. The shape and size of the groove are perfectly adapted to the outer circumference of the brick 1. For example, if the brick 1 is rectangular, the receiving groove 5 will be a rectangular groove, ensuring that the brick 1 can be completely embedded in the receiving groove 5, achieving "full circumferential wrapping". A locking slot 4 is formed at the top center of the receiving groove 5. The locking slot 4 is a rectangular or trapezoidal groove with a cross-sectional dimension that matches the subsequent locking block 8. It is used to cooperate with the locking block 8 of the lower shell 2 during subsequent longitudinal stacking to form longitudinal positioning. During transportation or handling, the shell 2 acts as a "protective layer" to directly withstand external collisions, such as minor impacts during forklift handling or stacking. Under pressure, the brick 1 is completely contained within the receiving groove 5, without direct contact with the outside. Even if slight scratches appear on the surface of the shell 2, it will not affect the refractory performance of the brick 1, solving the core pain point of "high damage rate during transportation" in traditional refractory bricks. The shell 2 "fully wraps" the outer perimeter of the brick 1, covering all five sides except the inner side that fits against the kiln body. This completely protects the vulnerable parts of the brick 1, such as the corners and edges. Even if the shell 2 collides with other objects during handling, the impact force is absorbed by the shell 2, and the force on the brick 1 is far below the compressive strength of the refractory brick, eliminating the risk of breakage. The gap fit between the receiving groove 5 and the brick 1 ensures a smooth transition. Once embedded, brick 1 remains secure, preventing wear caused by collisions with shell 2 during transport. After being secured via fastening holes 6, brick 1 and shell 2 form a rigid whole, allowing for simultaneous handling and installation, further reducing the probability of damage to brick 1. The fully enclosed design of shell 2 reduces the breakage rate of brick 1 during transport and handling compared to traditional methods, significantly improving the integrity of brick 1, reducing material waste due to breakage, and lowering construction costs. Shell 2 provides a structural foundation for subsequent horizontal splicing and vertical stacking, making individual refractory bricks "modular units" instead of traditional "scattered masonry," thus improving the construction efficiency of rotary kiln linings.

[0023] like Figure 1 , Figure 2 and Figure 4As shown, a locking block 8 is installed at the middle of the bottom of the housing 2. The middle of the bottom of the housing 2 is coaxial with the top locking slot 4. The locking block 8 is fixed by welding or bolts. The locking block 8 is a rectangular or trapezoidal solid structure. Its cross-sectional dimensions are completely matched with the locking slot 4. For example, if the locking slot 4 is a 10mm×8mm rectangle, the locking block 8 is a 9.8mm×7.8mm rectangle. A 0.2mm gap is reserved for insertion. The height of the locking block 8 is equal to the depth of the locking slot 4, such as 10mm, to ensure that the locking block 8 fits completely after being inserted into the locking slot 4 without any looseness.

[0024] like Figure 1 , Figure 2 and Figure 4 As shown, several sets of docking grooves 3 are symmetrically opened on one side surface of the shell 2. Several sets of docking grooves 3 are symmetrically opened along the height direction on one side surface of the shell 2, usually 2-3 sets, with uniform spacing; the docking grooves 3 are T-shaped or dovetail-shaped grooves, with anti-detachment structure to avoid lateral separation, and the groove walls are smooth.

[0025] like Figure 1 , Figure 2 and Figure 4 As shown, several sets of mating strips 7 are symmetrically installed on the other side surface of the shell 2. These mating strips 7 are installed symmetrically to the mating groove 3 on the other side surface of the shell 2. The cross-sectional shape and size of the mating strips 7 perfectly match the mating groove 3. For example, if the mating groove 3 is T-shaped, the mating strip 7 is a T-shaped boss. The length of the mating strip 7 is the same as the height of the shell 2, ensuring that it can be fully inserted into the mating groove 3 during lateral splicing. During lateral splicing, such as when constructing the same circumferential layer of the rotary kiln lining, align the mating strips 7 of adjacent shells 2 with the mating groove 3 and push them in horizontally until the mating strip 7 is fully embedded in the mating groove 3, with the embedding depth equal to the depth of the mating groove 3, thus completing the lateral connection. The symmetrical distribution of the mating groove 3 and mating strips 7 in each set of shells 2 ensures uniform stress distribution after lateral splicing. The T-shaped / dovetail cross-section design facilitates the mating... After strip 7 is inserted into the butt joint groove 3, it cannot be separated along the direction perpendicular to the splicing. With the subsequent filling of the butt joint gap with refractory mortar, the lateral connection strength is increased, which can resist the tangential force when the rotary kiln rotates and prevent lateral misalignment. A single set of lateral splicing only requires two steps: "alignment-push-in". When splicing multiple sets, the continuous cooperation of "front butt joint strip 7-rear butt joint groove 3" forms a transverse ring structure with no splicing gap accumulation, ensuring the sealing of the rotary kiln lining and avoiding heat loss from the kiln. The interlocking design of butt joint strip 7 and butt joint groove 3 replaces the traditional "refractory brick tenon and mortise splicing". Traditional tenon and mortise are easily damaged. The lateral splicing time is shortened and the construction efficiency is improved. The absence of accumulated gaps ensures the sealing of the lining and reduces heat loss. The symmetrically distributed butt joint structure makes the lateral force uniform and avoids cracking of the lining caused by excessive local stress.

[0026] like Figure 1-4As shown, several sets of fastening holes 6 are symmetrically opened on both sides of the shell 2. These fastening holes 6 are typically 2-4 sets, evenly spaced, with hole diameters suitable for heat-resistant bolts, such as M8-M12. Fastening holes 6 of the same diameter are pre-drilled on the surface of the brick 1 at corresponding positions. These holes are drilled during the molding of the refractory brick or during subsequent splicing to ensure that the fastening holes 6 of both are perfectly aligned after the brick 1 is embedded in the receiving groove 5. During installation, first, the brick 1 is embedded in the receiving groove 5 of the shell 2, aligning the fastening holes 6. Then, a heat-resistant bolt, such as a 310S stainless steel bolt with a temperature resistance ≥1000℃, is passed through the fastening holes 6 of the shell 2 and the brick 1, and the nut is tightened to ensure a tight fit between the brick 1 and the shell 2 without relative movement. The bolt head can be recessed into a pre-drilled countersunk hole on the surface of the shell 2, which can be manually set to avoid protrusion affecting the splicing. The multiple sets of fastening holes 6 are symmetrically distributed to ensure that after the bolts are fixed, the brick 1 and the shell 2 are perfectly aligned. The contact surface of shell 2 has uniform pressure and no local gaps. Especially when the rotary kiln is rotating, the centrifugal force can be evenly transmitted to shell 2 through the bolts, preventing the brick 1 from shifting within shell 2. The material of the heat-resistant bolts matches the thermal expansion coefficients of shell 2 and brick 1, preventing bolt loosening due to thermal expansion differences when the rotary kiln is heated, and ensuring the stability of the fixed brick 1 and shell 2 during long-term use. The bolt fixing makes brick 1 and shell 2 form a rigid integrated unit, with no relative movement during handling and installation, and no wear on brick 1. When the rotary kiln is running, the high-temperature load and centrifugal force borne by brick 1 can be transmitted to the kiln body through shell 2, preventing the brick 1 from breaking due to independent stress. If shell 2 is partially damaged, the bolts can be unscrewed to replace shell 2 without replacing brick 1. Traditional refractory bricks need to be replaced as a whole when damaged, reducing maintenance costs. The detachable nature of the bolt fixing also facilitates the individual testing of brick 1, such as testing refractory performance, improving maintenance flexibility.

[0027] like Figure 1-4As shown, the locking block 8 and the locking slot 4 are located on the same axis. When stacked longitudinally, such as when building the upper and lower layers of the rotary kiln lining, the locking block 8 at the bottom of the upper shell 2 can be precisely inserted into the locking slot 4 at the top of the lower shell 2 without manual alignment. This shortens the alignment time compared to traditional methods, ensuring the overall verticality of multiple sets of bricks 1 after longitudinal stacking and preventing localized aggravation of wear on the rotary kiln lining due to tilting. The rectangular / trapezoidal cross-section design of the locking block 8 and the locking slot 4 has an "anti-detachment" characteristic, preventing lateral displacement. Combined with the refractory mortar used in subsequent kiln body construction, it fills the gap between the locking block 8 and the locking slot 4, enhancing the longitudinal connection strength. To prevent the lining from falling off, the locking blocks 8 and slots 4 of a single shell 2 only need to be aligned to complete the longitudinal connection. When multiple sets are stacked, the continuous cooperation of "upper layer locking blocks 8 - lower layer slots 4" forms a longitudinally rigid structure with no cumulative deviation, ensuring the roundness of the rotary kiln lining and meeting the requirements of rotary kiln operation. The interlocking design of locking blocks 8 and slots 4 replaces the traditional "longitudinal positioning of refractory mortar masonry". Longitudinal stacking can be carried out continuously, shortening the construction time and adapting to the needs of rapid maintenance of rotary kilns. The coaxial interlocking ensures the verticality and roundness of the longitudinal connection, reduces local stress concentration of the lining during the operation of the rotary kiln, and extends the service life of the lining.

[0028] like Figure 1-4 As shown, the depth of the shell 2 is the same as the thickness of the brick 1, and the depth of the receiving groove 5 is the same as the thickness of the brick 1. After the brick 1 is embedded in the receiving groove 5, its outer surface is completely flush with the outer surface of the shell 2, without protrusion or depression, thus avoiding the brick 1 from being bumped during handling and transportation due to protrusion of the shell 2. Traditional refractory bricks have no protection and have a high rate of damage from bumps and knocks at the edges and corners.

[0029] like Figure 1-4As shown, fastening holes 6 are also provided on the surface of brick 1 at the corresponding positions of fastening holes 6. Single module assembly: Embed brick 1 into the receiving groove 5 of shell 2, align the fastening holes 6 of both, insert heat-resistant bolts and tighten them to form an integrated modular unit of "brick 1-shell 2"; Horizontal splicing: On the inner wall of the rotary kiln cylinder, on the preset support structure, fix the first modular unit, then align the connecting strips 7 of adjacent units with the connecting grooves 3, and push them horizontally to complete the horizontal splicing. Repeat the operation until the splicing of the same circumferential layer is completed, and fill the gaps with refractory mortar; Vertical stacking: After completing one layer of horizontal splicing, align the locking block 8 at the bottom of the upper modular unit with the locking groove 4 at the top of the lower unit, and put it down vertically to complete the vertical positioning. Repeat the operation until the required inner lining height is achieved, and fill the gaps with refractory mortar; The gaps are filled with refractory mortar; overall fixing: after all modular units are assembled, the entire lining is fixed to the inner wall of the kiln through the pre-set connection structure between the shell 2 and the kiln body, such as bolts and anchors, to complete the construction; good protection effect of brick 1: the shell 2 is fully wrapped and fixed with bolts, so the damage rate of brick 1 during transportation and construction is much lower than that of traditional refractory bricks, with less material waste and lower construction costs; high integrity of brick 1: with no protruding structure and anti-collision design, the integrity rate of the edges and corners of brick 1 is improved, ensuring the integrity of the rotary kiln lining and avoiding local high temperature leakage caused by damage to brick 1; convenient and efficient assembly: the modular splicing of transverse connecting strips 7 / grooves + longitudinal clamping blocks 8 / grooves 4 improves construction efficiency, adapts to the needs of rapid maintenance and new construction of rotary kilns, and reduces downtime.

[0030] Working Principle: In actual use, since the refractory brick body 1 remains intact and undamaged, it effectively reduces external collision damage during transportation and handling, thus ensuring the integrity of the refractory bricks. When the rotary kiln needs to be assembled laterally, personnel only need to insert the refractory bricks into the receiving groove 5 of the shell 2 to achieve rapid assembly. Then, bolts can be used to connect the brick body 1 and the shell 2 by passing through the fastening hole 6 and the hole opened on the surface of the brick body 1, ensuring the strength of both. Then, personnel can connect the brick body 1 to the connecting strip 7 through the connecting groove 3 on the outer surface of the shell 2, thus achieving the lateral connection between the brick bodies 1. On this basis, by inserting the locking block 8 at the bottom of the shell 2 into the locking groove 4 at the top, the longitudinal connection of multiple sets of brick bodies 1 can be achieved. The two sets of structures working together can effectively improve the overall connection efficiency and facilitate better use laterally. Then, personnel can attach the entire shell 2 to cement, thus realizing the assembly of the rotary kiln. The device as a whole has the advantages of convenient assembly, good brick protection effect, and high brick integrity.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A modular refractory brick for a rotary kiln, comprising a brick body (1) and a shell (2), characterized in that, The brick (1) is surrounded by a shell (2), and a receiving groove (5) for the brick (1) to be installed is provided on the surface of the shell (2). A slot (4) is provided at the top center of the receiving groove (5).

2. The modular refractory brick for rotary kilns according to claim 1, characterized in that, A locking block (8) is installed at the middle position of the bottom of the housing (2).

3. The modular refractory brick for rotary kilns according to claim 1, characterized in that, Several sets of docking grooves (3) are symmetrically opened on one side surface of the shell (2).

4. The modular refractory brick for rotary kilns according to claim 1, characterized in that, Several sets of mating strips (7) are symmetrically installed on the other side surface of the shell (2).

5. The modular refractory brick for rotary kilns according to claim 1, characterized in that, Several sets of fastening holes (6) are symmetrically opened on both sides of the shell (2).

6. The modular refractory brick for rotary kilns according to claim 2, characterized in that, The card block (8) and the card slot (4) are located on the same axis.

7. The modular refractory brick for rotary kilns according to claim 1, characterized in that, The depth of the shell (2) is the same as the thickness of the brick (1).

8. The modular refractory brick for rotary kilns according to claim 1, characterized in that, The surface of the brick (1) is also provided with fastening holes (6) at the corresponding positions of the fastening holes (6).

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