Refractory lining body structure for tilting type aluminum melting furnace

Abstract

The utility model belongs to the technical field of melting equipment structures, and particularly relates to a refractory lining body structure for a tilting type aluminum melting furnace. According to the refractory lining body structure for the tilting type aluminum melting furnace, the refractory prefabricated bricks, the castable seams, the reinforcing grooves, the refractory steel grids and the refractory steel connecting rod units are arranged on the heat preservation layer, so that 1, the refractory steel grids are matched with the refractory steel connecting rod units, and the refractory lining body structure is formed; the connecting strength of the heat preservation layer and the castable seam is higher, and it is guaranteed that the refractory prefabricated bricks are not prone to displacement and falling off; the heat preservation layer can form a protruding structure on the reinforcing groove, the connecting strength of the fire-resistant prefabricated brick and the heat preservation layer is improved, and meanwhile the difficulty of displacement and falling of the fire-resistant prefabricated brick is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of smelting equipment structure, and particularly relates to a refractory lining structure for a tilting aluminum melting furnace. Background Technology

[0002] The primary function of an aluminum melting furnace is to heat and melt aluminum raw materials. Furthermore, alloy composition adjustment and slag removal / degassing steps in the aluminum smelting and casting process can also be carried out in the aluminum melting furnace.

[0003] Existing common aluminum melting furnaces mainly consist of a steel outer shell, an inner lining, a combustion lance, and a heat storage box. The aforementioned refractory lining structure refers to the inner lining.

[0004] On the other hand, a tilting aluminum melting furnace refers to a relatively special type of aluminum melting furnace equipment. Its main structural difference from ordinary aluminum melting furnaces is that the overall structure of a tilting aluminum melting furnace can rotate to facilitate the discharge of molten aluminum. Correspondingly, this rotational action is generally achieved by various common hydraulic cylinders.

[0005] Therefore, the lining structure for tilting aluminum melting furnaces must not only ensure heat insulation and erosion resistance, but also have a certain degree of installation stability, so that it can be used stably for a long time inside the steel shell that is frequently rotating.

[0006] For example, Chinese utility model patent with authorization announcement number CN220039099U and authorization announcement date of 2023.11.17 discloses a refractory lining for the bottom of a circular aluminum melting furnace. Its structure includes a circular aluminum melting furnace, a furnace body steel shell, a seepage-proof insulation layer, precast blocks, a working layer castable, lifting holes, and structural joints.

[0007] The refractory lining in this utility model patent has the following main advantages: after the precast blocks are installed, only a shorter furnace drying time is needed before production can begin; when the refractory lining at the bottom of the furnace is partially damaged and needs to be replaced, the precast blocks can be directly replaced, reducing the construction and furnace drying time during shutdown maintenance, thus saving energy and reducing consumption.

[0008] However, in actual use, this refractory lining structure still has at least the following two shortcomings, which are also the technical problems that this utility model aims to solve:

[0009] First, the working layer castable structure and the waterproof and heat-insulating layer are only connected by casting, lacking other auxiliary reinforcement structures. Therefore, the working layer castable and the precast block as a whole structure are prone to displacement and falling off on the waterproof and heat-insulating layer. This is especially obvious in tilting aluminum melting furnaces.

[0010] Secondly, its precast block structure lacks a dedicated structure for reinforcing the connection between the waterproof and heat-insulating layers. The two can only be fixed by surface-to-surface casting, which results in relatively low strength.

[0011] Therefore, in summary, there is an urgent need for a new type of lining structure composed of cast-in-place material and precast blocks, which is not easily displaced or fallen off the insulation layer, for use in various tilting aluminum melting furnaces. Utility Model Content

[0012] This utility model provides a refractory lining structure for a tilting aluminum melting furnace. By incorporating refractory precast bricks, refractory joints, reinforcing grooves, refractory steel mesh, and refractory steel connecting rod units on the insulation layer, the following advantages are achieved: 1. The refractory steel mesh and connecting rod units work together to increase the connection strength between the insulation layer and the refractory joints, ensuring that the refractory precast bricks are less likely to shift or fall off; 2. The insulation layer can form a raised structure on the reinforcing grooves, increasing the connection strength between the refractory precast bricks and the insulation layer, further increasing the difficulty of shifting or falling off the refractory precast bricks.

[0013] The technical solution adopted by this utility model to solve the above problems is: a refractory lining structure for a tilting aluminum melting furnace, including an insulation layer, refractory precast bricks, and a refractory joint, and further including a reinforcing groove disposed on the refractory precast bricks and used to be inserted into the insulation layer, a refractory steel mesh disposed in the insulation layer, and a refractory steel connecting rod unit disposed on the refractory steel mesh and inserted into the refractory joint.

[0014] A further preferred technical solution is that the reinforcing groove is rectangular in shape and extends through two opposite sides of the refractory precast brick.

[0015] A further preferred technical solution is that the depth of the reinforcing groove is 5-15% of the thickness of the refractory precast brick.

[0016] A further preferred technical solution is that the refractory steel connecting rod unit includes an inverted V-shaped bent rod with both ends set on the refractory steel mesh and inserted into the refractory seam.

[0017] A further preferred technical solution is that the fire-resistant steel connecting rod unit further includes an inverted V-shaped fixing block disposed at the end of the inverted V-shaped bent rod and used to engage the fire-resistant steel mesh.

[0018] A further preferred technical solution is that the fire-resistant steel connecting rod unit further includes an arc-shaped fixing block disposed at the end position of the inverted V-shaped bent rod and used to engage the fire-resistant steel mesh.

[0019] A further preferred technical solution is that the fire-resistant steel mesh is also provided with a support frame unit for connecting the steel outer shell.

[0020] A further preferred technical solution is that the support frame unit includes a support rod disposed on the steel outer shell, and a support piece disposed on the support rod and used to connect the fire-resistant steel mesh.

[0021] A further preferred technical solution is that the support frame unit further includes a cross-shaped groove disposed on the support plate and used to engage the fire-resistant steel mesh.

[0022] A further preferred technical solution is that the minimum indentation distance of the inverted V-shaped bent rod on the surface of the refractory joint is ≥1.2cm. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a schematic diagram showing the position of the fire-resistant steel connecting rod unit in this utility model.

[0025] Figure 3 This is a schematic diagram showing the position and shape of the reinforcing groove in this utility model.

[0026] Figure 4 This is a structural schematic diagram of the support frame unit in this utility model.

[0027] Figure 5 This is a schematic diagram showing the position of the support frame unit in this utility model.

[0028] Figure 6 This is a schematic diagram of the inverted V-shaped bent rod in this utility model.

[0029] Figure 7 This is a schematic diagram showing the shapes of the inverted V-shaped fixing block and the arc-shaped fixing block in this utility model.

[0030] The meanings of the markings in the diagram are as follows:

[0031] Steel outer shell a, support block b, hydraulic cylinder hinge block c, minimum retraction distance L;

[0032] 11. Insulation layer; 12. Refractory precast bricks; 13. Castable joint;

[0033] 1. Reinforcement groove; 2. Fire-resistant steel mesh; 3. Fire-resistant steel connecting rod unit; 4. Support frame unit;

[0034] Inverted V-shaped bending rod 301, inverted V-shaped fixing block 302, arc-shaped fixing block 303;

[0035] Support rod 401, support plate 402, cross-shaped groove 403. Detailed Implementation

[0036] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0037] As attached Figure 1-7 As shown, a refractory lining structure for a tilting aluminum melting furnace includes an insulation layer 11, refractory precast bricks 12, and a refractory joint 13. It also includes a reinforcing groove 1 disposed on the refractory precast bricks 12 and used to be inserted into the insulation layer 11, a refractory steel mesh 2 disposed in the insulation layer 11, and a refractory steel connecting rod unit 3 disposed on the refractory steel mesh 2 and inserted into the refractory joint 13.

[0038] In this embodiment, the steel outer shell a is provided with a feed inlet, a discharge outlet, an air vent, and a combustion lance. The support block b can slide on an arc-shaped track, and the hydraulic cylinder hinge block c is the power input position for the aluminum melting furnace to rotate and tilt. Thus, the tilting aluminum raw material melting function of the aluminum melting furnace is effectively realized. The refractory lining structure is discontinuous at least at the feed inlet, discharge outlet, air vent, and combustion lance, but in all other locations, it fully covers the inner surface of the steel outer shell a, ensuring the effective execution of the aluminum raw material melting operation.

[0039] On the other hand, the raw material of the insulation layer 11 can be the commonly used lightweight insulation castable, and the raw materials of the refractory precast bricks 12 and the castable joints 13 can be the commonly used high-temperature refractory castables. The former is a factory prefabricated product, while the latter needs to be cast in place on the insulation layer 11 and between adjacent refractory precast bricks 12.

[0040] Furthermore, the melting temperature inside the tilting aluminum melting furnace is generally 600-900℃, the refractory temperature of the aforementioned high-temperature refractory castable is generally 1100-1300℃, and the refractory steel raw material of the refractory steel mesh 2 and refractory steel connecting rod unit 3 generally has a refractory temperature of ≥1000℃. Even the aforementioned lightweight insulating castable generally has a refractory temperature of ≥900℃. Therefore, the refractory function and the function of protecting the steel outer shell of this lining structure are effectively realized.

[0041] Before the insulation layer 11 is fully cured, the refractory precast bricks 12 have already been laid. Therefore, the insulation layer 11 forms raised strips on the reinforcing groove 1, resulting in both a casting connection and a locking and fixing effect between the insulation layer 11 and the refractory precast bricks 12. This ensures that the refractory precast bricks 12 are not easily displaced or fall off.

[0042] Furthermore, part of the refractory steel connecting rod unit 3 is located inside the insulation layer 11, and the other part is located inside the castable joint 13. Therefore, it can also play an auxiliary reinforcement role between the insulation layer 11 and the castable joint 13, which were originally just cast-connected, ensuring that the castable joint 13 is not easy to fall off the insulation layer 11, and ultimately strengthening the structure of the entire refractory lining.

[0043] Finally, the fire-resistant steel mesh 2 has at least the following functions:

[0044] First, as a transitional structure and a connection strength enhancement structure connecting the fire-resistant steel connecting rod unit 3 to the insulation layer 11, the former is not easily separated from the latter;

[0045] Secondly, it serves as a separate "skeleton" structure within the insulation layer 11, thereby improving the insulation layer 11's impact resistance.

[0046] However, it is important to note that the relative dimensions of the refractory steel mesh 2 and the insulation layer 11, and the refractory steel connecting rod unit 3 and the castable joint 13, should not be too large, otherwise the strength of the two components as a cast-in-place structure will be reduced. For example, if the reinforcing bars of the refractory steel mesh 2 are too thick, the insulation layer 11 itself is prone to cracking.

[0047] The reinforcing groove 1 is rectangular in shape and extends through two opposite sides of the refractory precast brick 12.

[0048] In this embodiment, the shape of the refractory precast brick 12 is not fixed. The factory needs to produce precast brick products with a suitable shape and sufficient quantity according to the specific shape and size of the tilting aluminum melting furnace. Generally, most of the refractory precast bricks 12 are curved cuboids with a length and width of 10-20cm and a thickness of 5-8cm.

[0049] The reinforcement groove 1 is a through groove with exposed ends, which facilitates the entry and filling of the cast-in-place material of the insulation layer 11.

[0050] The depth of the reinforcing groove 1 is 5-15% of the thickness of the refractory precast brick 12.

[0051] In this embodiment, if the reinforcing groove 1 is too deep, it will significantly reduce the structural strength of the refractory precast brick 12. If it is too shallow, the protruding strip formed on it by the insulation layer 11 will not have sufficient locking strength and will not significantly reinforce the refractory precast brick 12.

[0052] Therefore, the aforementioned depth range of the reinforcing groove 1 was determined. Specifically, each of the individual refractory precast bricks 12 has 3-10 reinforcing grooves 1, and the width of each reinforcing groove 1 is 0.5-1.0 cm.

[0053] The refractory steel connecting rod unit 3 includes an inverted V-shaped bent rod 301 with both ends set on the refractory steel mesh 2 and inserted into the casting slit 13.

[0054] In this embodiment, both sections of the inverted V-shaped bent rod 301 are inserted into the insulation layer 11 and the other section is inserted into the casting slurry joint 13. The two sections of the rod can be of unequal length.

[0055] Furthermore, the two sections of the rod can be connected to the same reinforcing bar that makes up the fire-resistant steel mesh 2, or they can be connected to two adjacent reinforcing bars respectively. Thus, a single inverted V-shaped bent rod 301 can effectively perform two pulling connections between the insulation layer 11 and the refractory joint 13, ensuring that the insulation layer 11 and the refractory joint 13 are not easily separated.

[0056] On the other hand, during the construction of the grout joint 13, the inverted V-shaped bending rod 301 is already fixed on the insulation layer 11. The preferred way to use the inverted V-shaped bending rod 301 is to distribute its height evenly on the insulation layer 11 and the grout joint 13 as much as possible, and to set itself as vertically as possible.

[0057] The fire-resistant steel connecting rod unit 3 also includes an inverted V-shaped fixing block 302 disposed at the end of the inverted V-shaped bent rod 301 and used to engage the fire-resistant steel mesh 2.

[0058] In this embodiment, the upper middle end of the inverted V-shaped bent rod 301 is located inside the grout joint 13, and its lower two ends can be welded to the above-mentioned reinforcing bars, snapped together, or simply stably erected.

[0059] The inverted V-shaped fixing block 302 is a stable erection method described above, which makes it difficult for the inverted V-shaped bending rod 301 to fall off the refractory steel grid 2. That is, during the entire process of casting the refractory material that makes up the insulation layer 11, the inverted V-shaped bending rod 301 can tilt but will not fall off.

[0060] The fire-resistant steel connecting rod unit 3 also includes an arc-shaped fixing block 303 disposed at the end of the inverted V-shaped bent rod 301 and used to engage the fire-resistant steel mesh 2.

[0061] In this embodiment, when the central angle of the arc-shaped fixing block 303 is less than 180°, its connection with the fire-resistant steel mesh 2 is the stable erection described above; when its central angle is greater than 180°, its connection with the fire-resistant steel mesh 2 is the snap-fit ​​connection described above.

[0062] The former method is easy to install, while the latter method offers a strong connection. Correspondingly, the welding method described above is the most complex to install, but provides the strongest connection.

[0063] The fire-resistant steel mesh 2 is also provided with a support frame unit 4 for connecting the steel outer shell.

[0064] In this embodiment, the function of the support frame unit 4 includes at least:

[0065] First, the refractory steel mesh 2 is centered in the thickness direction of the insulation layer 11, ensuring that its "skeleton effect" of strengthening the structural strength of the insulation layer is more significant.

[0066] Secondly, the fire-resistant steel mesh 2 is provided with a fixed installation height relative to the inner side of the steel outer shell a, so that the height of all the inverted V-shaped bending rods 301 is also consistent, avoiding the harmful situation that some of the inverted V-shaped bending rods 301 cannot fully connect to the casting sprue 13 due to being too low, and some of the inverted V-shaped bending rods 301 cannot fully connect to the insulation layer 11 due to being too high.

[0067] The support frame unit 4 includes a support rod 401 disposed on the steel outer shell a, and a support piece 402 disposed on the support rod 401 and used to connect the fire-resistant steel mesh 2.

[0068] In this embodiment, the support frame unit 4 is integrally formed and is made of fire-resistant steel. Two to three support rods 401 are provided on each support piece 402.

[0069] Welding is the preferred method for connecting the support rod 401 and the inner side of the steel outer shell a, as well as the support plate 402 and the fire-resistant steel mesh 2.

[0070] However, when the cylindrical insulation layer 11 has two openings on the horizontal sides and its own axial direction is horizontal, and the bottom is continuously cast in batches while rotating, the above welding method can be cancelled. Therefore, at this time, the support rod 401 is always pressed on the inner side of the steel shell a, and the fire-resistant steel mesh 2 is always pressed on the support plate 402.

[0071] The support frame unit 4 also includes a cross-shaped groove 403 disposed on the support plate 402 and used to engage the fire-resistant steel mesh 2.

[0072] In this embodiment, the cross-shaped groove 403 is used to engage and fix the cross-shaped connection on the refractory steel mesh 2, so that before the insulation layer 11 is poured, the support frame unit 4 and the refractory steel mesh 2 are already connected into a whole with a suitable relative position and sufficient support effect, so as to avoid the support frame unit 4 from shifting and tipping over when the refractory material is poured or flows.

[0073] Correspondingly, if the support plate 402 and the fire-resistant steel mesh 2 are welded, the cross-shaped groove 403 also has the advantage of increasing the effective welding size.

[0074] The minimum indentation distance L of the inverted V-shaped bent rod 301 on the surface of the refractory joint 13 is ≥1.2cm.

[0075] In this embodiment, if the inverted V-shaped bending rod 301 significantly occupies the gap space between two adjacent refractory precast bricks 12, the amount of castable refractory in the castable joint 13 will be significantly reduced, which is detrimental to the structural stability and casting connection strength of the castable joint 13.

[0076] Correspondingly, if the minimum indentation distance L is too small, the thickness of the refractory at the middle bend of the inverted V-shaped bent rod 301 will be too small, and cracks will easily appear in the refractory seam 13 at this point, causing the lining structure to peel off, which is not allowed.

[0077] Finally, the refractory steel mesh 2, refractory steel connecting rod unit 3, and support frame unit 4 serve as the skeleton structure and connecting reinforcement structure inside the castable, provided that their relative sizes are not too large; otherwise, it will reduce the structural stability of the castable after molding.

[0078] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this utility model. These are non-inventive modifications and are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. A refractory lining structure for a tilting aluminum melting furnace, comprising an insulation layer (11), refractory precast bricks (12), and a castable joint (13), characterized in that: It also includes a reinforcing groove (1) set on the refractory precast brick (12) and used to be inserted into the insulation layer (11), a refractory steel mesh (2) set in the insulation layer (11), and a refractory steel connecting rod unit (3) set on the refractory steel mesh (2) and inserted into the casting slit (13).

2. The refractory lining structure for a tilting aluminum melting furnace according to claim 1, characterized in that: The reinforcing groove (1) is rectangular in shape and extends through the two opposite sides of the refractory precast brick (12).

3. The refractory lining structure for a tilting aluminum melting furnace according to claim 1, characterized in that: The depth of the reinforcing groove (1) is 5-15% of the thickness of the refractory precast brick (12).

4. The refractory lining structure for a tilting aluminum melting furnace according to claim 1, characterized in that: The fire-resistant steel connecting rod unit (3) includes an inverted V-shaped bent rod (301) with both ends set on the fire-resistant steel mesh (2) and inserted into the casting slit (13).

5. The refractory lining structure for a tilting aluminum melting furnace according to claim 4, characterized in that: The fire-resistant steel connecting rod unit (3) also includes an inverted V-shaped fixing block (302) disposed at the end of the inverted V-shaped bent rod (301) and used to engage the fire-resistant steel mesh (2).

6. The refractory lining structure for a tilting aluminum melting furnace according to claim 4, characterized in that: The fire-resistant steel connecting rod unit (3) also includes an arc-shaped fixing block (303) located at the end of the inverted V-shaped bent rod (301) and used to engage the fire-resistant steel mesh (2).

7. The refractory lining structure for a tilting aluminum melting furnace according to claim 1, characterized in that: The fire-resistant steel mesh (2) is also provided with a support frame unit (4) for connecting the steel shell.

8. The refractory lining structure for a tilting aluminum melting furnace according to claim 7, characterized in that: The support frame unit (4) includes a support rod (401) disposed on the steel outer shell (a) and a support piece (402) disposed on the support rod (401) and used to connect the fire-resistant steel mesh (2).

9. The refractory lining structure for a tilting aluminum melting furnace according to claim 8, characterized in that: The support frame unit (4) also includes a cross-shaped groove (403) disposed on the support plate (402) and used to engage the fire-resistant steel mesh (2).

10. The refractory lining structure for a tilting aluminum melting furnace according to claim 4, characterized in that: The minimum indentation distance of the inverted V-shaped bent rod (301) on the surface of the casting joint (13) is ≥1.2cm.

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