Vacuum induction melting crucible

Abstract

The utility model relates to the technical field of vacuum induction melting high-temperature mother alloy, and discloses a vacuum induction melting crucible which comprises a crucible body, a corundum dry vibration material filling layer and an induction coil layer are sequentially wrapped on the outer wall of the crucible body from inside to outside, an induction coil is arranged in the induction coil layer, and the induction coil is arranged in the induction coil layer. A plurality of pressing pieces are arranged on the top of the induction coil layer, the pressing pieces are connected with the induction coil layer through fasteners, and the pressing pieces are attached to the top of the induction coil layer and the top of the pot body. According to the prefabricated crucible, the problem of crucible cracking can be relieved, the service life of the prefabricated crucible is prolonged, and the problems of electricity tripping and even steel leakage and water leakage caused by the fact that alloy liquid permeates into the filler are solved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum induction melting of high-temperature master alloys, and in particular to a vacuum induction melting crucible. Background Technology

[0002] Vacuum induction melting furnaces for high-temperature master alloy smelting have begun to use prefabricated crucibles due to the increasing requirements for the purity of molten steel in master alloys. However, the service life of prefabricated crucibles is about 20-30% shorter than that of rammed crucibles.

[0003] In vacuum induction melting of master alloys, after a certain number of melting cycles, residues or inclusions may form on the inner wall of the crucible due to the purity of the raw materials, requiring crucible cleaning. As the temperature decreases, the pre-made crucible shrinks. Because the pre-made crucible is encased in filler material, it shrinks laterally back to its original state. However, the longitudinal shrinkage is reduced due to the absence of filler material, leading to transverse through-cracks in the crucible. During master alloy melting, as the alloy temperature rises to melting point, the crucible expands, preventing the transverse through-cracks from closing, allowing molten alloy to enter. The repeated cycles of crucible cooling and heating cause the cracks in the pre-made crucible to continue expanding, with alloy seeping into the crucible, reducing its lifespan. Furthermore, as the alloy seeps into the filler material, it can come into contact with the coil, causing a power outage and halting melting. In severe cases, molten alloy coming into contact with the coil can cause steel leakage, or even coil damage and water leakage. Utility Model Content

[0004] Purpose of the utility model: In view of the problems existing in the prior art, this utility model provides a vacuum induction melting crucible, which can alleviate the problem of crucible cracking, improve the service life of prefabricated crucibles, and eliminate the electric shock caused by the alloy liquid seeping into the filler, or even steel leakage and water leakage.

[0005] Technical solution: This utility model provides a vacuum induction melting crucible, including a pot body. The outer wall of the pot body is wrapped with a corundum dry vibrating material filling layer and an induction coil layer from the inside to the outside. An induction coil is disposed in the induction coil layer. Several pressure plates are disposed on the top of the induction coil layer. The pressure plates are connected to the induction coil layer by fasteners, and the pressure plates are attached to the top of the induction coil layer and the top of the pot body.

[0006] A pressure plate is installed on top of the induction coil layer. The pressure plate, through fasteners, presses against the top of the induction coil layer and the top of the pot body. On the one hand, when the crucible heats up, the pressure plate can suppress the thermal expansion and deformation of the precast crucible pot body, reduce the cracks formed in the transverse direction of the precast crucible, and reduce the penetration of molten alloy into the precast crucible. On the other hand, when the crucible cools down, the fasteners are tightened to reduce the space between the pressure plate and the crucible caused by cooling contraction, thereby reducing the longitudinal thermal expansion and deformation of the precast crucible, suppressing crack propagation, and reducing the penetration of alloy into the filler layer and then into the coil, which could cause steel leakage, power outage, inability to melt, or even coil damage and water leakage.

[0007] A corundum-based dry vibratory filler layer is provided, the main material of which is alumina powder. This filler layer serves as the furnace lining of the precast crucible. After sintering, it fixes the precast crucible and prevents molten steel from seeping into the induction coil if the precast crucible cracks, thus protecting the induction coil. The corundum-based dry vibratory filler layer is a powdered material; its hardness increases after sintering. It forms a blocky shape near the precast crucible while remaining powdery away from it, thereby preventing the flow of molten alloy.

[0008] Furthermore, the top of the pot body is higher than the top of the induction coil layer, with a height difference of 5-10mm.

[0009] The height difference between the top of the pot body and the top of the induction coil layer serves two purposes: firstly, it further prevents the molten alloy from flowing out of the pot body; secondly, it provides space for the first pressing plate.

[0010] Furthermore, the pressing sheet includes a first pressing sheet and a second pressing sheet disposed on the first pressing sheet, wherein the first pressing sheet is an insulating pressing sheet and the second pressing sheet is a high-temperature resistant pressing sheet.

[0011] Furthermore, the first pressing sheet is attached to the top of the induction coil layer and the top of the corundum dry vibrating material filling layer, and the second pressing sheet is attached to the upper part of the first pressing sheet and the top of the pot body.

[0012] Insulating and high-temperature resistant pressure plates are installed. The insulating pressure plates insulate the induction coil layer, fasteners and molten alloy in the crucible from each other, preventing the molten alloy from splashing during the melting process. This causes the induction coil layer, fasteners and molten alloy in the crucible to form a whole, thereby generating a magnetic field when the induction coil is energized, and the induction coil layer and fasteners are induced to heat up.

[0013] The height difference between the top of the pot and the top of the induction coil layer prevents the first pressure plate from contacting the molten alloy in the crucible. This is because the first pressure plate is an insulating plate, and insulating materials have a low melting point; contact with the molten alloy in the crucible would easily cause it to melt. Simultaneously, a high-temperature resistant pressure plate is placed on top of the insulating plate to protect it from melting.

[0014] Optionally, the second tablet is a stainless steel tablet.

[0015] Furthermore, a high-temperature refractory clay layer is provided on the corundum dry vibrating material filling layer, and the high-temperature refractory clay layer is located between the pot body and the induction coil layer.

[0016] Since the corundum dry vibrating material filling layer is a powder layer, a high-temperature refractory mortar layer is placed on top of it. During the sintering process of the precast crucible, the high-temperature refractory mortar forms a block, preventing the corundum dry vibrating material filling layer powder from overflowing and contaminating the molten alloy. Furthermore, the high-temperature refractory mortar layer further prevents molten alloy from splashing during the melting process, thus preventing the induction coil layer, fasteners, and molten alloy in the crucible from becoming integrated and subsequently being induction heated.

[0017] Furthermore, an induction coil protective sleeve is provided between the induction coil layer and the corundum dry vibrating material filling layer.

[0018] Beneficial effects: Compared with the prior art, the specific beneficial effects of this utility model are as follows:

[0019] This invention can effectively reduce cracks formed in precast crucibles during use due to repeated cooling and heating cycles, thus alleviating crucible cracking problems, increasing the service life of precast crucibles, and eliminating electrical tripping or even steel and water leakage caused by molten alloy seeping into the filler. This invention can increase the service life of precast crucibles by more than 30%. Attached image description:

[0020] Figure 1 A cross-sectional view of a vacuum induction melting crucible provided by this utility model;

[0021] Figure 2 A cross-sectional view of another vacuum induction melting crucible provided by this utility model;

[0022] Figure 3 A three-dimensional structural diagram of the upper part of another vacuum induction melting crucible provided by this utility model;

[0023] Illustration: 1. Pot body; 2. Corundum dry vibrating material filling layer; 3. Induction coil protective sleeve; 4. Induction coil layer; 5. High-temperature refractory clay layer; 6. Induction coil; 7. Pressing plate; 701. First pressing plate; 702. Second pressing plate; 8. Fastener. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the embodiments.

[0025] Implementation method 1:

[0026] This utility model provides a vacuum induction melting crucible:

[0027] like Figure 1 As shown: It includes a pot body 1, and on the outer wall of the pot body 1, from the inside out, there is a corundum dry vibrating material filling layer 2, an induction coil protective sleeve 3, and an induction coil layer 4. An induction coil 6 is installed inside the induction coil layer 4.

[0028] Optionally, the induction coil layer 4 is a steel shell.

[0029] The induction coil protective sleeve 3 protects the induction coil, making the inner surface of the induction coil a single unit. Later addition of corundum dry vibrating filler prevents filler powder from entering the coil interior.

[0030] Optionally, the corundum dry vibratory filler layer 2 is mainly made of alumina powder. As the furnace lining of the precast crucible, it serves to fix the precast crucible after sintering and prevents molten steel from seeping into the induction coil 6 after the precast crucible cracks, thus protecting the induction coil 6. (The corundum dry vibratory filler layer 2 is a powdered material. After sintering, its hardness increases, forming a blocky shape near the precast crucible while remaining powdery away from the precast crucible, thereby preventing the flow of molten alloy.)

[0031] Several pressure plates 7 are provided on the top of the induction coil layer 4. The pressure plates 7 are connected to the top of the induction coil layer 4 by fasteners 8 (fixing bolts). The pressure plates 7 extend from the top of the induction coil layer 4 to the top of the pot body 1. The pressure plates 7 press the induction coil layer 4 and the pot body 1 tightly. (Here, the inventor provides the following design scheme, but it should be noted that this scheme is not the only design scheme of this utility model: holes can be drilled evenly on the top of the induction coil layer and threads can be tapped; then the pressure plates are installed and locked with bolts).

[0032] A high-temperature refractory mortar layer 5 is disposed on the corundum dry vibrating material filling layer 2, and the high-temperature refractory mortar layer 5 is located between the induction coil protective sleeve 3 and the pot body 1. Optionally, the high-temperature refractory mortar layer 5 is made of green clay. The top of the corundum dry vibrating material filling layer 2 is approximately 50mm away from the top of the pot body 1.

[0033] Furthermore, such as Figure 2-3 As shown: the upper surface of the induction coil layer 4 has a height difference with the upper surface of the pot body 1, and the upper surface of the pot body 1 is 10mm higher than the upper surface of the induction coil layer 4; the pressing plate 7 includes a first pressing plate 701 (insulating pressing plate) and a second pressing plate 702 (high temperature resistant pressing plate) disposed on the insulating pressing plate; the insulating pressing plate is 10mm thick and extends from the top of the induction coil layer 4 to the top of the high temperature refractory mud layer 5. The insulating pressing plate does not directly contact the alloy liquid in the pot body 1; the high temperature resistant pressing plate covers the upper surface of the insulating pressing plate and extends from the upper surface of the insulating pressing plate to the top of the pot body 1.

[0034] Optionally, before melting, the device can be further protected by covering the pressing plate 7 and fasteners 8 with green clay; in addition, after the crucible cools, the fasteners 8 can be tightened further to ensure that the pressing plate 7 presses the induction coil layer 4 and the pot body 1, thus suppressing the propagation of crucible cracks.

[0035] Implementation Method 2:

[0036] This embodiment is largely the same as embodiment 1, except that the upper surface of the pot body 1 is 5mm higher than the upper surface of the induction coil layer 4; and the thickness of the insulating sheet is 5mm.

[0037] Apart from the above, this implementation method is exactly the same as implementation method 1, and will not be described again here.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vacuum induction melting crucible, characterized by, The container includes a pot body, the outer wall of which is wrapped from the inside out with a corundum dry vibrating material filling layer and an induction coil layer. An induction coil is disposed inside the induction coil layer. Several pressure plates are disposed on the top of the induction coil layer. The pressure plates are connected to the induction coil layer by fasteners and are attached to the top of the induction coil layer and the top of the pot body.

2. The vacuum induction melting crucible of claim 1, wherein: The top of the pot body is higher than the top of the induction coil layer, with a height difference of 5-10mm.

3. The vacuum induction melting crucible of claim 2, wherein: The pressing sheet includes a first pressing sheet and a second pressing sheet disposed on the first pressing sheet. The first pressing sheet is an insulating pressing sheet, and the second pressing sheet is a high-temperature resistant pressing sheet.

4. The vacuum induction melting crucible of claim 3, wherein: The first pressing sheet is attached to the top of the induction coil layer and the top of the corundum dry vibrating material filling layer, and the second pressing sheet is attached to the upper part of the first pressing sheet and the top of the pot body.

5. The vacuum induction melting crucible of claim 1, wherein: The fastener is a fixing bolt.

6. The vacuum induction melting crucible of claim 1, wherein: A high-temperature refractory mortar layer is provided on the corundum dry vibrating material filling layer, and the high-temperature refractory mortar layer is located between the pot body and the induction coil layer.

7. The vacuum induction melting crucible of claim 1, wherein: An induction coil protective sleeve is also provided between the induction coil layer and the corundum dry vibrating material filling layer.

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