Graphite crucible assembly type heat-insulating furnace cylinder device

Abstract

The utility model discloses graphite crucible assembly type heat preservation furnace cylinder device, including sand base and fixed installation on sand base and graphite crucible, and graphite crucible has the heat preservation furnace cylinder outside the sleeve;The heat preservation furnace cylinder and graphite crucible between set up the refractory layer, and the cylinder wall of heat preservation furnace cylinder is the double -sided structure of inside and outside, and fills the heat preservation layer between layers;The heat preservation furnace cylinder is combined installation by the first heat preservation furnace cylinder of lower part and the second heat preservation furnace cylinder of upper part. The utility model graphite crucible assembly type heat preservation furnace cylinder device inside adopts high temperature resistance heat preservation cotton to can ensure the heat transfer in the smelting process of graphite crucible, and the heat preservation furnace cylinder is isolated with graphite crucible and uses quartz sand, prolongs the service life of heat preservation device, can make material in the heating process heat -consistency simultaneously, and temperature distribution is more uniform, reduces the problem such as the performance of material not being consistent due to temperature difference, is favorable for improving product quality stability, and the external protection effect in the process of graphite crucible assembly use, avoids the crack of graphite because of its texture brittle collision.

Description

Technical Field

[0001] This utility model belongs to the technical field of smelting equipment and relates to a graphite crucible assembled heat-insulating furnace cylinder device. Background Technology

[0002] Molybdenum-aluminum alloys, as advanced alloy materials possessing high strength, high melting point, and excellent electrical and thermal conductivity, have irreplaceable applications in high-end manufacturing fields such as aerospace, electronic devices, and high-temperature structural components. Their unique performance advantages rely on precise smelting processes, and the temperature control, compositional uniformity, and safety during smelting directly determine the final quality of the alloy. In the smelting process of molybdenum-aluminum alloys, the aluminothermic reaction is a common and crucial step. This reaction, through a violent redox reaction between aluminum and molybdenum oxides, not only generates the target alloy components but also instantly releases enormous amounts of heat, causing the reaction system temperature to rise sharply. This high-temperature environment is the core guarantee for the alloying process; only at sufficiently high temperatures can metals such as molybdenum and aluminum fully melt, achieving atomic-level homogeneous mixing and avoiding performance defects caused by component segregation. Simultaneously, to precisely control the alloy composition, a batch feeding method is often used during smelting, which places extremely high demands on the stability of the reaction vessel: it must withstand continuous high temperatures and cope with potential localized temperature fluctuations during the feeding process. In addition, the smelting environment must be strictly controlled for impurity contamination. Any substances leaching from the container or impurities introduced from the outside may damage the purity of the alloy, thereby affecting its mechanical and physicochemical properties. Meanwhile, efficient heat transfer capacity can ensure uniform heat distribution, avoid local overheating or insufficient temperature, and ensure the stability of the smelting reaction.

[0003] Among numerous smelting containers, graphite crucibles have become the core choice for molybdenum-aluminum alloy smelting due to their superior comprehensive performance. Graphite crucibles exhibit excellent high-temperature resistance; their main material, graphite, possesses extremely high refractoriness, and standard products can stably withstand smelting temperatures of 1200℃~1600℃, fully covering the basic temperature requirements for molybdenum-aluminum alloy smelting. For some special smelting processes requiring ultra-high-temperature environments, specially designed graphite crucibles can even withstand extreme temperatures up to 3650℃, providing reliable support for extreme reaction conditions. This stable high-temperature resistance ensures that the heat released by the aluminothermic reaction does not cause immediate damage to the container itself, providing a stable environment for the continuous reaction. Simultaneously, graphite's excellent thermal conductivity allows for rapid heat transfer, resulting in a more uniform temperature distribution within the crucible, reducing alloy composition deviations caused by localized overheating, and further guaranteeing alloying quality. Furthermore, graphite materials possess good chemical stability, and at high temperatures, they do not readily react chemically with molten molybdenum, aluminum, or other metals, effectively preventing contamination of the alloy by the container material and meeting the stringent purity requirements of high-end alloys.

[0004] However, the practical application of graphite crucibles in molybdenum-aluminum alloy smelting still faces significant challenges. During high-temperature smelting, as the reaction proceeds, the lower part of the graphite crucible, due to continuous contact with the high-temperature molten metal and the core reaction area, often turns entirely red, directly reflecting the high-temperature load it bears. Although graphite itself has a relatively small coefficient of expansion and its volume stability under temperature changes is better than most refractories, the extreme temperature conditions in molybdenum-aluminum alloy smelting can still trigger structural risks. The large amount of heat released instantaneously by the aluminothermic reaction can cause a rapid increase in the local temperature of the crucible in a short period of time, while the addition of low-temperature raw materials during batch feeding can cause sudden cooling in local areas. This drastic temperature change can lead to significant stress concentration inside the crucible. When the stress exceeds the bearing capacity of the graphite material, cracks will appear in the crucible. These cracks may initially appear as fine lines, but they will continue to expand under the repeated action of high temperature and stress as the smelting process continues.

[0005] The consequences of crucible cracking are extremely serious. Once the crack penetrates the crucible wall, molten molybdenum-aluminum alloy will leak out. This not only directly wastes valuable raw materials and increases smelting costs, but the leaking high-temperature alloy may also react with the refractory materials or metal structure of the smelting furnace, damaging the furnace equipment and shortening its lifespan. More importantly, uncontrolled leakage of high-temperature liquids poses a significant safety hazard, potentially causing fires, explosions, or burns, seriously threatening production safety. Besides cracking caused by temperature changes, the inherent brittleness of graphite also increases the difficulty of its use. During handling, installation, and daily operation, even slight collisions or pressure can cause damage. Even surface damage that does not penetrate can become stress concentration points during subsequent high-temperature smelting, accelerating crack formation and propagation. Therefore, throughout the entire service life of graphite crucibles, from storage and transportation to smelting operations, strict protective measures must be implemented to prevent mechanical impacts from damaging their structural integrity. Utility Model Content

[0006] The purpose of this invention is to provide a graphite crucible assembled heat-insulating furnace cylinder device, which solves the problem of uneven temperature distribution and cracking of graphite crucibles when the temperature changes drastically in the prior art.

[0007] The technical solution adopted in this utility model is a graphite crucible assembled heat-insulating furnace cylinder device, including a sand base and a graphite crucible fixedly installed on the sand base, with a heat-insulating furnace cylinder surrounding the graphite crucible; a refractory layer is provided between the heat-insulating furnace cylinder and the graphite crucible, and the cylinder wall of the heat-insulating furnace cylinder has an inner and outer double-layer structure with an insulation layer filling the space between the layers; the heat-insulating furnace cylinder is assembled from an upper first heat-insulating furnace cylinder and a lower second heat-insulating furnace cylinder.

[0008] The features of this utility model also include: The insulation layer material is high-temperature resistant insulation cotton.

[0009] The refractory layer material is quartz sand, and the thickness of the refractory layer is 8mm~10mm.

[0010] The sand-based material is quartz sand.

[0011] The bottoms of the first and second insulation furnace cylinders are respectively sealed with bottom plates, and the tops are each uniformly arranged with several reinforcing ribs along the circumference.

[0012] Limiting guide plates are installed at the joint between the outer walls of the first and second insulation furnace cylinders.

[0013] Several lifting lugs are installed on the outer wall of the heat-insulating furnace cylinder, evenly distributed along the circumference of the furnace cylinder.

[0014] The outer diameter of the insulation furnace barrel is 1170±4mm, the inner diameter is 1010±4mm, and the height is 750±4mm.

[0015] The beneficial effects of this utility model are: This utility model's assembled insulated furnace cylinder device for graphite crucibles uses high-temperature resistant insulation cotton inside to ensure heat transfer during the graphite crucible smelting process. The insulated furnace cylinder and graphite crucible are isolated with quartz sand, extending the service life of the insulation device. At the same time, it can ensure that the material is heated evenly during the heating process, resulting in a more uniform temperature distribution and reducing problems such as inconsistent material properties caused by temperature differences. This is beneficial to improving product quality stability and provides external protection for the graphite crucible during assembly and use, preventing cracks from occurring due to the brittle texture of graphite upon impact. Attached Figure Description

[0016] Figure 1 is an assembly schematic diagram of the graphite crucible assembled heat-insulating furnace cylinder device of this utility model. Figure 2 This is a top view of the graphite crucible assembled heat-insulating furnace cylinder device of this utility model.

[0017] In the figure, 1. Insulated furnace cylinder, 2. First insulated furnace cylinder, 3. Second insulated furnace cylinder, 4. Graphite crucible, 5. Refractory layer, 6. Sand base, 7. Limiting guide plate, 8. Rib plate, 9. Bottom plate, 10. Lifting lug. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] This utility model relates to a graphite crucible assembled heat-insulating furnace cylinder device, such as... Figure 1As shown, it includes a sand base 6 and a graphite crucible 4 vertically installed on the sand base 6. The graphite crucible 4 is covered by an insulating furnace cylinder 1. The sand base 6 is a pad made of quartz sand to ensure heat insulation. The insulating furnace cylinder 1 and the graphite crucible 4 are both vertically installed on the sand base 6. The insulating furnace cylinder 1 is placed outside the graphite crucible 4 to protect and insulate it. A refractory layer 5 is provided between the insulated furnace cylinder 1 and the graphite crucible 4. The refractory layer 5 is filled with quartz sand, which utilizes the high temperature resistance of sand and avoids direct contact between the insulated furnace cylinder 1 and the graphite crucible 4. The thickness of the refractory layer 5 is 8mm~10mm. The brittleness of the graphite crucible 4 makes it easy to be damaged by collision and contact, while the fluidity of quartz sand can fill the gap between the insulated furnace cylinder 1 and the graphite crucible 4, ensuring the full function of the refractory layer. The wall of the insulated furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the space between the layers is filled with an insulation layer. The insulation layer material is high-temperature resistant insulation cotton with a specification of 0.6m³. This ensures that the ambient temperature around the graphite crucible 4 does not change drastically, which could damage the internal structure of the graphite crucible 4. The heat-insulating furnace cylinder 1 is composed of a lower first heat-insulating furnace cylinder 2 and an upper second heat-insulating furnace cylinder 3 assembled together; as follows Figure 2 As shown, the bottom of the first insulation furnace cylinder 2 and the second insulation furnace cylinder 3 are respectively sealed with bottom plates 9, and the top is respectively provided with stiffening plates 8 to ensure the cylinder structure is firm; the insulation furnace cylinder 1 is divided into upper and lower detachable cylinders, which makes the graphite crucible 4 easier to operate and safer during installation and disassembly. A limiting guide plate 7 is installed at the joint of the outer walls of the first insulation furnace cylinder 2 and the second insulation furnace cylinder 3. The limiting guide plate 7 ensures that the first insulation furnace cylinder 2 and the second insulation furnace cylinder 3 are accurately positioned and installed in place. Several lifting lugs 10 are provided on the outer wall of the heat-insulating furnace cylinder 1, and are evenly distributed along the circumference of the outer wall of the heat-insulating furnace cylinder 1 to facilitate assembly and transportation; the lifting lugs 10 are made of lifting plates.

[0020] The outer diameter of the heat-insulating furnace cylinder 1 is 1170±4mm, the inner diameter is 1010±4mm, and the height is 750±4mm. It is selected and matched with the graphite crucible 4 according to the selected size. During the assembly process, the heat-insulating furnace cylinder lifting lug 10 is used with a crane for hoisting operations to ensure proper assembly.

[0021] This invention uses quartz sand to prepare the sand base 6 and the refractory layer 5. Natural quartz sand typically has a SiO2 content of over 90%, while purified quartz sand (such as fused quartz sand) can achieve a purity of over 99.9%, or even 99.99%. This high purity enhances its core properties, such as chemical stability and high-temperature resistance. Quartz, the main component of quartz sand, belongs to the hexagonal crystal system and has a stable crystal structure, which is the basis for its high hardness and impact resistance.

[0022] The working principle of this utility model of graphite crucible assembled heat-insulating furnace cylinder device is as follows: The graphite crucible 4 is vertically placed on the sand base 6, and the heat-insulating furnace cylinder 1 is placed on the outside of the graphite crucible 4. Quartz sand is filled between the two parts to form a refractory layer. The molybdenum-aluminum alloy smelting operation is carried out inside the graphite crucible 4. The heat-insulating furnace cylinder 1 can make the temperature distribution more uniform, so that the material is heated evenly during the heating process, reducing problems such as inconsistent material properties caused by temperature differences, and providing external protection for the graphite crucible 4 during assembly and use.

[0023] Example 1 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0024] Example 2 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0025] The insulation layer material is high-temperature resistant insulation cotton.

[0026] Example 3 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0027] The insulation layer material is high-temperature resistant insulation cotton.

[0028] The refractory layer 5 is made of quartz sand, and its thickness is 8mm~10mm.

[0029] Example 4 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0030] The insulation layer material is high-temperature resistant insulation cotton.

[0031] The refractory layer 5 is made of quartz sand, and its thickness is 8mm~10mm.

[0032] Sand-based material 6 is quartz sand.

[0033] Example 5 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0034] The insulation layer material is high-temperature resistant insulation cotton.

[0035] The refractory layer 5 is made of quartz sand, and its thickness is 8mm~10mm.

[0036] Sand-based material 6 is quartz sand.

[0037] The bottom of the first insulation furnace cylinder 2 and the second insulation furnace cylinder 3 are respectively sealed and connected with a bottom plate 9, and the top of each cylinder is evenly provided with several reinforcing plates 8 along the circumference.

[0038] Example 6 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0039] The insulation layer material is high-temperature resistant insulation cotton.

[0040] The refractory layer 5 is made of quartz sand, and its thickness is 8mm~10mm.

[0041] Sand-based material 6 is quartz sand.

[0042] The bottom of the first insulation furnace cylinder 2 and the second insulation furnace cylinder 3 are respectively sealed and connected with a bottom plate 9, and the top of each cylinder is evenly provided with several reinforcing plates 8 along the circumference.

[0043] Limiting guide plates 7 are installed at the joints of the outer walls of the first and second insulated furnace cylinders 2 and 3.

[0044] Example 7 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0045] The insulation layer material is high-temperature resistant insulation cotton.

[0046] The refractory layer 5 is made of quartz sand, and its thickness is 8mm~10mm.

[0047] Sand-based material 6 is quartz sand.

[0048] The bottom of the first insulation furnace cylinder 2 and the second insulation furnace cylinder 3 are respectively sealed and connected with a bottom plate 9, and the top of each cylinder is evenly provided with several reinforcing plates 8 along the circumference.

[0049] Limiting guide plates 7 are installed at the joints of the outer walls of the first and second insulated furnace cylinders 2 and 3.

[0050] Several lifting lugs 10 are provided on the outer wall of the heat-insulating furnace cylinder 1, and are evenly distributed along the circumference of the heat-insulating furnace cylinder 1.

[0051] Example 8 The graphite crucible assembled heat-insulating furnace cylinder device in this embodiment includes a sand base 6 and a graphite crucible 4 fixedly installed on the sand base 6. The graphite crucible 4 is covered by a heat-insulating furnace cylinder 1. A refractory layer 5 is provided between the heat-insulating furnace cylinder 1 and the graphite crucible 4. The cylinder wall of the heat-insulating furnace cylinder 1 has a double-layer structure with an inner and outer layer, and the interlayer is filled with a heat-insulating layer. The heat-insulating furnace cylinder 1 is assembled from an upper first heat-insulating furnace cylinder 2 and a lower second heat-insulating furnace cylinder 3.

[0052] The insulation layer material is high-temperature resistant insulation cotton.

[0053] The refractory layer 5 is made of quartz sand, and its thickness is 8mm~10mm.

[0054] Sand-based material 6 is quartz sand.

[0055] The bottom of the first insulation furnace cylinder 2 and the second insulation furnace cylinder 3 are respectively sealed and connected with a bottom plate 9, and the top of each cylinder is evenly provided with several reinforcing plates 8 along the circumference.

[0056] Limiting guide plates 7 are installed at the joints of the outer walls of the first and second insulated furnace cylinders 2 and 3.

[0057] Several lifting lugs 10 are provided on the outer wall of the heat-insulating furnace cylinder 1, and are evenly distributed along the circumference of the heat-insulating furnace cylinder 1.

[0058] The outer cylinder diameter of the heat preservation furnace barrel 1 is 1170±4mm, the inner cylinder diameter is 1010±mm, and the height is 750±mm.

Claims

1. A graphite crucible assembled heat-insulating furnace cylinder device, characterized in that, It includes a sand base (6) and a graphite crucible (4) fixedly installed on the sand base (6). The graphite crucible (4) is covered with an insulating furnace cylinder (1). A refractory layer (5) is provided between the insulating furnace cylinder (1) and the graphite crucible (4). The wall of the insulating furnace cylinder (1) is a double-layer structure with an inner and outer layer, and the space between the layers is filled with an insulating layer. The insulating furnace cylinder (1) is assembled by combining the upper first insulating furnace cylinder (2) and the lower second insulating furnace cylinder (3).

2. The graphite crucible assembled heat-insulating furnace cylinder device according to claim 1, characterized in that, The insulation layer material is high-temperature resistant insulation cotton.

3. The graphite crucible assembled heat-insulating furnace cylinder device according to claim 1, characterized in that, The refractory layer (5) is made of quartz sand and has a thickness of 8mm to 10mm.

4. The graphite crucible assembled heat-insulating furnace cylinder device according to claim 1, characterized in that, The sand base material (6) is quartz sand.

5. The graphite crucible assembled heat-insulating furnace cylinder device according to claim 1, characterized in that, The bottom of the first heat-insulating furnace cylinder (2) and the second heat-insulating furnace cylinder (3) are respectively sealed with a bottom plate (9), and the top of each cylinder is uniformly provided with several reinforcing plates (8) along the circumference.

6. The graphite crucible assembled heat-insulating furnace cylinder device according to claim 1, characterized in that, A limiting guide plate (7) is provided at the joint of the outer wall of the first heat-insulating furnace cylinder (2) and the second heat-insulating furnace cylinder (3).

7. The graphite crucible assembled heat-insulating furnace cylinder device according to claim 1, characterized in that, Several lifting lugs (10) are provided on the outer wall of the heat-insulating furnace cylinder (1), and are evenly distributed along the circumferential direction of the furnace cylinder (1) wall.

8. The graphite crucible assembled heat-insulating furnace cylinder device according to claim 1, characterized in that, The outer diameter of the heat-insulating furnace cylinder (1) is 1170±4mm, the inner diameter is 1010±4mm, and the height is 750±4mm.

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