Crucible sealing combination device and heating furnace comprising same

Abstract

The utility model provides a crucible sealing combination device and a heating furnace comprising the same, and relates to the field of alloy smelting. The crucible sealing combination device comprises a crucible body, a sealing mechanism and a pneumatic control mechanism, the sealing mechanism is arranged at an opening of the crucible body, a closed space is formed between the sealing mechanism and the crucible body, and the pneumatic control mechanism is connected with the sealing mechanism so as to vacuumize the closed space and input inert gas into the closed space. When an alloy is smelted, sealing can be achieved through the vacuum protection device, inert gas is introduced during feeding, the density of the inert gas is larger than that of air, liquid level protection is conducted through the gravity effect, and alloy liquid can have the dual functions of vacuum protection and inert gas protection in the smelting process.

Description

Technical Field

[0001] The utility model relates to the field of alloy smelting, in particular to a crucible sealing assembly device and a heating furnace comprising the device. Background Art

[0002] Alloy melting is a critical step in the casting process, directly impacting casting quality, including material properties and internal microstructure. Inhalation is a particularly serious issue for alloys with high hydrogen solubility and high reactivity, such as aluminum-lithium alloys, which can severely impact alloy melt quality. During alloy processing, steps like feeding and refining inevitably expose the alloy to air, which can easily lead to inhalation and oxidation. Therefore, it is necessary to isolate the air during the melting process by creating a vacuum environment and using an inert gas shield to improve alloy melt quality.

[0003] Crucibles are vessels or melting pots made of refractory materials such as clay, graphite, porcelain clay, or refractory metals. They are commonly used for solid heating. During alloy smelting, they are required to melt alloy ingots, add master alloys, refine the alloys, and perform refining and degassing. Currently, industrial crucibles are often heated in resistance furnaces, which expose them to the atmosphere and lack a protective gas atmosphere. If the smelting process is performed in a vacuum melting furnace, manual labor and equipment entry into the furnace are required for charging and alloy refining, making it difficult to maintain a complete vacuum environment.

[0004] Therefore, it is urgent to develop a crucible sealing assembly device and a heating furnace comprising the device that overcome the above-mentioned defects. Utility Model Content

[0005] In order to solve the problems existing in the above-mentioned prior art, in a first aspect, the utility model provides a crucible sealing assembly device, comprising:

[0006] Crucible body;

[0007] A sealing mechanism is installed at the mouth of the crucible body, and a closed space is formed between the sealing mechanism and the crucible body;

[0008] The gas control mechanism is connected to the sealing mechanism to evacuate the enclosed space and input inert gas into the enclosed space.

[0009] Preferably, the sealing mechanism includes:

[0010] A sealing ring, mounted on the rim of the crucible body;

[0011] The sealing cylinder is covered on the sealing ring and has a feeding port at its bottom;

[0012] The sealing cover is installed on the feeding port to form a closed space between the sealing mechanism and the crucible body.

[0013] Preferably, the gas control mechanism includes:

[0014] A vacuuming assembly connected to the sealing mechanism to perform vacuuming on the confined space;

[0015] The gas delivery component is connected to the sealing mechanism to input inert gas into the enclosed space.

[0016] Preferably, the vacuum pumping assembly includes:

[0017] Vacuum pump;

[0018] One end of the vacuum line is connected to the vacuum pump, and the other end is connected to the sealing cylinder to perform vacuum treatment on the enclosed space.

[0019] Preferably, the gas delivery assembly includes:

[0020] At least one inert gas bottle;

[0021] At least one gas delivery pipeline has one end connected to the inert gas bottle and the other end connected to the sealing cylinder to input the inert gas into the enclosed space.

[0022] Preferably, the vacuum pumping assembly further comprises:

[0023] The vacuum pipe is connected to the sealing cylinder through the vacuum pipe.

[0024] Preferably, the gas delivery assembly further comprises:

[0025] At least one air inlet pipe, the air delivery pipeline is connected to the sealing cylinder through the air inlet pipe.

[0026] Preferably, the air extraction pipe and the air intake pipe pass through the sealing tube and extend into the enclosed space.

[0027] Preferably, the sealing mechanism further comprises:

[0028] The sealing gasket is installed between the sealing ring and the sealing cylinder.

[0029] In a second aspect, the utility model provides a heating furnace, comprising:

[0030] furnace lining;

[0031] As in the crucible sealing assembly device of the first aspect, the crucible body is arranged in the furnace lining;

[0032] The heating mechanism surrounds the crucible body and is arranged between the crucible body and the furnace lining to heat the crucible body.

[0033] The beneficial effects of the utility model are as follows: during alloy smelting, sealing can be achieved through the utility model, and inert gas is introduced when adding materials. Relying on the fact that the density of the inert gas is greater than the density of air, the liquid surface is protected by gravity, so that the alloy liquid can have the dual functions of vacuum protection and inert gas protection during the smelting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is a schematic diagram of a heating furnace according to an embodiment of the present invention;

[0036] Figure 2 This is an exploded schematic diagram of a sealing mechanism according to another embodiment of the present invention.

[0037] Wherein, the accompanying drawings are marked as follows:

[0038] Crucible body 1; sealing mechanism 2; gas control mechanism 3; furnace lining 4; heating mechanism 5; ground G;

[0039] Sealing ring 21; sealing cylinder 22; sealing cover 23; sealing gasket 24;

[0040] Vacuuming component 31; gas delivery component 32;

[0041] Vacuum pump 311; vacuum pipeline 312; exhaust pipe 313;

[0042] Inert gas bottle 321; gas pipeline 322; gas pipe 323. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] The exemplary embodiments and descriptions of the present invention are intended to explain the present invention, but are not intended to limit the present invention. In addition, elements / components with the same or similar reference numerals in the drawings and embodiments are intended to represent the same or similar parts.

[0045] The terms "first", "second", "S1", "S2", etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described with the same technical terms.

[0046] The directional terms used herein, such as up, down, left, right, front, or back, are only used to refer to the directions in the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0047] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0048] As used herein, "and / or" includes any and all combinations of the items mentioned.

[0049] Regarding "plurality" in this document, "plurality" includes "two" and "more than two"; regarding "plurality groups" in this document, "plurality groups" includes "two groups" and "more than two groups".

[0050] Certain terms used to describe the present application are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art regarding the description of the present application.

[0051] Please refer to Figures 1 to 2 , Figure 1 This is a schematic diagram of a heating furnace according to an embodiment of the present invention. Figure 2 This is an exploded schematic diagram of the sealing mechanism of another embodiment of the present invention. Figures 1 to 2 As shown, in the first aspect, the utility model provides a crucible sealing assembly device, comprising: a crucible body, a sealing mechanism and an air control mechanism, the sealing mechanism being installed at the mouth of the crucible body, forming a closed space between the sealing mechanism and the crucible body, the air control mechanism being connected to the sealing mechanism to evacuate the closed space and input inert gas into the closed space.

[0052] Further, please refer to Figures 1 to 2 The above-mentioned sealing mechanism includes: a sealing ring, a sealing tube and a sealing cover. The sealing ring is installed on the edge of the crucible body, the sealing tube cover is installed on the sealing ring, and a feeding port is opened at the bottom of the sealing tube. The sealing cover is installed on the feeding port to form a closed space between the sealing mechanism and the crucible body.

[0053] Wherein, the sealing mechanism further comprises: a sealing gasket, which is installed between the sealing ring and the sealing cylinder.

[0054] Further, please refer to Figures 1 to 2The above-mentioned gas control mechanism includes: a vacuum pumping component and a gas delivery component. The vacuum pumping component is connected to the sealing mechanism to vacuum the enclosed space, and the gas delivery component is connected to the sealing mechanism to input inert gas into the enclosed space.

[0055] Further, please refer to Figures 1 to 2 The above-mentioned vacuum pumping assembly includes: a vacuum pump and a vacuum pumping pipeline, one end of the vacuum pumping pipeline is connected to the vacuum pump, and the other end is connected to the sealing cylinder to vacuum the enclosed space.

[0056] Further, please refer to Figures 1 to 2 The gas delivery assembly includes: at least one inert gas bottle and at least one gas delivery pipeline, one end of the gas delivery pipeline is connected to the inert gas bottle, and the other end is connected to the sealing cylinder to input inert gas into the enclosed space.

[0057] Further, please refer to Figures 1 to 2 The above-mentioned vacuum pumping component also includes: an air pumping pipe, and the vacuum pumping pipeline is connected to the sealing cylinder through the air pumping pipe.

[0058] Further, please refer to Figures 1 to 2 The above-mentioned gas delivery component also includes: at least one air inlet pipe, and the gas delivery pipeline is connected to the sealing cylinder through the air inlet pipe.

[0059] The air extraction pipe and the air intake pipe pass through the sealing tube and extend into the enclosed space.

[0060] In the second aspect, the utility model provides a heating furnace, comprising: a furnace lining, a crucible sealing assembly device as described in the first aspect, and a heating mechanism, wherein the crucible body is arranged in the furnace lining, and the heating mechanism surrounds the crucible body and is arranged between the crucible body and the furnace lining to heat the crucible body.

[0061] Specifically, in a certain embodiment of the present invention, the present invention includes a crucible body, a sealing mechanism and an air control mechanism. The crucible body is a turnover device for holding molten alloy liquid, and requires an operating temperature of above 900°C. At the same time, the crucible body needs to be equipped with a base to increase the service life of the crucible body. The crucible body is also a smelting device for the alloy liquid. It can be circulated after smelting in other smelting furnaces, or it can be smelted without moving the casting area. The sealing mechanism includes a sealing ring, a sealing cylinder and a sealing cover. First, the flange at the mouth of the crucible body must be sealed. A sealing ring is placed on the lower plane of the flange at the mouth of the crucible body, and the lower end face is sealed. Then, a sealing cylinder is placed. Sealant or asbestos sealing gasket can be placed between the two to ensure sealing. The air control mechanism includes a vacuum pump component and a gas transmission component. The vacuum pump component has the functions of vacuum pressure detection and automatic vacuum degree adjustment. It consists of a vacuum pump, a PLC control program, a vacuum pump pipeline, a vacuum gauge and a gas storage tank. One end of the vacuum pump pipeline is connected to the vacuum pump, and the other end passes through the sealing cylinder. The gas supply assembly mainly includes an inert gas bottle, a pressure gauge, two gas supply lines, a control valve, and a moisture dryer. The gas supply line passes through the sealing cylinder. When in use, the valve is opened, and the inert gas is filtered through the moisture dryer and directly enters the sealing cylinder. The gas covers the alloy liquid surface downward, forming a protective pressure, thereby achieving inert gas protection. The heating furnace is composed of the above-mentioned crucible sealing assembly, a furnace lining, and a heating mechanism. The crucible body is arranged in the furnace lining. The furnace lining plays a role in insulating the crucible sealing assembly. The heating mechanism is a heating resistance wire arranged around the crucible body, which heats the furnace during alloy smelting. In another embodiment of the present invention, the vacuum assembly also includes an exhaust pipe, and the vacuum pipe is connected to the sealing cylinder through the exhaust pipe. The gas supply assembly also includes two gas pipes, and the gas pipe is connected to the sealing cylinder through the gas pipe. The exhaust hole facing the side of the enclosed space is processed into an inclined hole, and the gas outlet direction corresponds to the alloy liquid surface, thereby facilitating the coverage of the liquid surface.

[0062] The operation steps of the utility model are as follows: first connect the sealing ring to the edge of the crucible body, lift the crucible body and place it into the furnace of the heating furnace, then pre-place the alloy ingot and high melting point alloy into the crucible body, start heating with the heating resistance wire, increase the temperature until all are melted, and the alloy ingot is melted from solid to liquid metal; lift the sealing cylinder and place it on the sealing ring, apply sealant on the contact surface of the two, cover with a sealing cover to form a closed space, and connect a vacuum pump for vacuum treatment; when other alloy materials need to be added, place the baked alloy materials around the crucible body, open the inert gas bottle to introduce inert gas, and after the inert gas enters the closed space, it forms a protective atmosphere. Open the sealing cover, turn off the vacuum pump, add materials, and stir after melting; then cover the sealing cover, turn on the vacuum pump, and then turn off the inert gas bottle, and use the gas control mechanism to protect the surface of the alloy liquid; when refining treatment is required, open the sealing cover, turn off the vacuum pump, and carry out refining treatment. After the treatment is completed, cover the sealing cover. Turn on the vacuum pump and then close the inert gas bottle; the temperature measurement link of the entire process is measured by a thermocouple embedded in the sealing cover; before pouring the alloy, sprinkle the covering agent to isolate the air, and open the sealing cover for pouring.

[0063] The present invention addresses the problem of alloys being easily oxidized during smelting. During alloy smelting, sealing can be achieved through a vacuum device. When adding materials, an inert gas is introduced. Relying on the fact that the density of the inert gas is greater than the density of air, gravity is used to protect the liquid surface. This allows the alloy liquid to have the dual functions of vacuum protection and inert gas protection during the smelting process. By using this method, a significant protective effect is achieved for easily oxidized metals, such as cast aluminum-lithium alloys. According to this process, the gas content is measured to be less than 1%, and the gas content of the alloy liquid after treatment without a sealing device is measured to be above 5%, essentially achieving the effect of vacuum smelting. This method is simple to modify, easy to implement, low-cost, and flexible to operate.

[0064] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A crucible sealing assembly device, characterized in that: include: Crucible body; A sealing mechanism is installed at the mouth of the crucible body, and a closed space is formed between the sealing mechanism and the crucible body; The gas control mechanism is connected to the sealing mechanism to evacuate the enclosed space and input inert gas into the enclosed space.

2. The crucible sealing assembly according to claim 1, wherein: The sealing mechanism comprises: A sealing ring, mounted on the edge of the crucible body; A sealing cylinder is covered on the sealing ring and has a feeding port at its bottom; A sealing cover is mounted on the feeding port to form the enclosed space between the sealing mechanism and the crucible body.

3. The crucible sealing assembly according to claim 2, wherein: The gas control mechanism comprises: a vacuuming assembly connected to the sealing mechanism to perform vacuuming on the enclosed space; A gas delivery component is connected to the sealing mechanism to input inert gas into the enclosed space.

4. The crucible sealing assembly according to claim 3, wherein: The vacuum assembly comprises: Vacuum pump; A vacuum pumping pipeline has one end connected to the vacuum pump and the other end connected to the sealing cylinder to perform vacuum treatment on the enclosed space.

5. The crucible sealing assembly according to claim 4, wherein: The gas delivery assembly comprises: At least one inert gas bottle; At least one gas delivery pipeline has one end connected to the inert gas bottle and the other end connected to the sealing cylinder to input the inert gas into the enclosed space.

6. The crucible sealing assembly according to claim 5, wherein: The vacuum assembly further comprises: An air extraction pipe, the vacuum extraction pipeline is connected to the sealing cylinder through the air extraction pipe.

7. The crucible sealing assembly according to claim 6, wherein: The gas delivery assembly further comprises: At least one air inlet pipe, the air delivery pipeline is connected to the sealing cylinder through the air inlet pipe.

8. The crucible sealing assembly according to claim 7, wherein: The air extraction pipe and the air intake pipe pass through the sealing tube and extend into the enclosed space.

9. The crucible sealing assembly according to claim 2, wherein: The sealing mechanism further comprises: A sealing gasket is installed between the sealing ring and the sealing cylinder.

10. A heating furnace, characterized in that: include: furnace lining; The crucible sealing assembly according to any one of claims 1 to 9, wherein the crucible body is disposed in the furnace lining; The heating mechanism surrounds the crucible body and is disposed between the crucible body and the furnace lining to heat the crucible body.

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