Vacuum induction melting furnace capable of removing slag

Abstract

This utility model relates to the field of melting furnaces, specifically a slag-removing vacuum induction melting furnace. It includes a furnace frame and a vacuum chamber mounted on the furnace frame, with a furnace cover rotatably mounted on the front side of the vacuum chamber. It also includes a melting mechanism and a vacuum slag-removing mechanism. A crucible is mounted on the heating end of the melting mechanism. The vacuum slag-removing mechanism includes: a bellows, positioned on a pre-reserved interface above the vacuum chamber; a flange blind plate, positioned on the top of the bellows; a slag-removing rod, passing through the flange blind plate, sealed with a sealing ring; a slag-removing spoon at the bottom of the slag-removing rod; and a slag crucible, positioned on the left inner wall of the vacuum chamber. This utility model can remove impurities, prevent slag inclusions, and improve metal purity. Slag removal reduces the molten metal's ability to absorb gases, improving casting quality. After slag removal, the heat transfer efficiency of the molten metal is enhanced, reducing local overheating and increasing the melting rate. It also improves production efficiency, reduces manual stirring, and simplifies the operation process.

Description

Technical Field

[0001] This utility model relates to the field of smelting furnaces, and in particular to a vacuum induction smelting furnace with slag removal capability. Background Technology

[0002] Vacuum induction furnace melting is carried out under vacuum conditions by using electromagnetic induction to generate eddy currents in a metal conductor to heat the furnace charge. It features a small melting chamber volume, short vacuuming time and melting cycle, easy temperature and pressure control, recovery of volatile elements, and accurate control of alloy composition.

[0003] However, traditional vacuum induction melting furnaces cannot achieve vacuum slag removal, resulting in the slag not being removed in time after the material is melted, leading to slag inclusion defects and insufficient purity in the material. Utility Model Content

[0004] The purpose of this invention is to address the problem in the prior art that vacuum slag removal is not possible, and to propose a vacuum induction melting furnace capable of slag removal.

[0005] The technical solution of this utility model: A vacuum induction melting furnace with slag removal capability, comprising a furnace frame and a vacuum chamber disposed on the furnace frame, with a furnace cover rotatably disposed on the front side of the vacuum chamber; further comprising a melting mechanism and a vacuum slag removal mechanism, wherein the heating end of the melting mechanism is located inside the vacuum chamber, and a crucible is disposed on the heating end; the vacuum slag removal mechanism comprises:

[0006] A bellows is installed on the pre-reserved interface above the vacuum chamber;

[0007] Flange blind plate, installed on top of bellows;

[0008] The slag remover rod passes through the flange blind plate, and the slag remover rod and the flange blind plate are sealed by a sealing ring. A slag remover spoon is installed at the bottom of the slag remover rod.

[0009] And the slag crucible is located on the inner wall of the left side of the vacuum chamber.

[0010] Preferably, the vacuum chamber is made entirely of 304 stainless steel and is argon arc welded. The furnace shell of the vacuum chamber adopts a double-layer water-cooled structure. The vacuum chamber is a horizontal structure, with a vacuum flange welded to the rear of the vacuum chamber. A high-vacuum valve is installed on the vacuum flange, and the vacuum valve is then connected to the vacuum pump.

[0011] Preferably, the furnace cover is provided with a furnace cover observation window, and the vacuum chamber is provided with multiple chamber observation windows.

[0012] Preferably, the melting mechanism includes an electrode rotatably disposed on the right side of the vacuum chamber, and a coil connected to the positive and negative poles of the electrode and wound in a spiral shape, with the crucible disposed inside the coil.

[0013] Preferably, an air inlet valve, an air outlet valve, and a pressure gauge are installed on the vacuum chamber to dynamically control the air pressure inside the vacuum chamber.

[0014] Preferably, an infrared thermometer or thermocouple is installed on the vacuum chamber. The 1-5V signal output by the infrared thermometer or the thermocouple signal is converted into a temperature signal by a temperature control instrument. The temperature control instrument outputs a control signal to control the temperature rise of the vacuum chamber.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] 1. Remove impurities: The slag formed on the surface of the melt contains flux, metal oxides and non-metallic inclusions. Slag removal can effectively remove these impurities, prevent slag inclusion defects, and improve the purity of the metal.

[0017] 2. Reduce gas absorption: Molten slag has a porous structure and easily adsorbs gases such as water vapor. By removing slag, the molten material's ability to adsorb gases can be reduced, thus improving the quality of castings.

[0018] 3. Optimize heat transfer: Slag has poor thermal conductivity. After slag removal, the heat transfer efficiency of the molten metal can be enhanced, local overheating can be reduced, and the melting rate can be increased.

[0019] 4. Improve production efficiency, reduce manual mixing, and simplify operation procedures. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the structure inside the vacuum chamber.

[0022] Reference numerals in the attached drawings: 1. Vacuum chamber; 2. Furnace cover; 3. Vacuum flange; 4. Furnace cover observation window; 5. Chamber observation window; 6. Furnace frame; 7. Vacuum slag removal mechanism; 8. Electrode; 9. Coil; 10. Crucible; 11. Slag removal rod; 12. Corrugated pipe; 13. Slag crucible; 14. Slag removal spoon; 15. Flange blind plate. Detailed Implementation

[0023] Example 1

[0024] like Figures 1-2 As shown, the present invention proposes a vacuum induction melting furnace with slag removal capability, comprising a furnace frame 6 and a vacuum chamber 1 disposed on the furnace frame 6, a furnace cover 2 rotatably disposed on the front side of the vacuum chamber 1, and the furnace frame 6 being a cabinet structure welded from shaped steel plates; it also includes a melting mechanism and a vacuum slag removal mechanism 7, the heating end of the melting mechanism being located inside the vacuum chamber 1, a crucible 10 being disposed on the heating end, and the vacuum slag removal mechanism 7 comprising:

[0025] Bellows 12 is installed on the interface reserved above the vacuum chamber 1;

[0026] Flange blind plate 15 is installed on top of bellows 12;

[0027] The slag removal rod 11 passes through the flange blind plate 15. The slag removal rod 11 and the flange blind plate 15 are sealed by a sealing ring. The slag removal rod 11 can move up and down and change its angle without leaking air. A slag removal spoon 14 is set at the bottom of the slag removal rod 11. The slag removal spoon 14 can be made of different materials, such as stainless steel, quartz, tungsten, molybdenum, etc., depending on the properties of the material. The slag removal spoon 14 is fixed to the slag removal rod 11 with screws.

[0028] And the slag crucible 13 is set on the inner wall of the left side of the vacuum chamber 1, near the crucible 10. The slag scoop 14 scoops up the slag floating on the surface of the material and sends it to the slag crucible 13.

[0029] Example 2

[0030] like Figures 1-2 As shown, the present invention proposes a vacuum induction melting furnace with slag removal capability. Compared with Embodiment 1, this embodiment details the structural details.

[0031] Vacuum chamber 1 is constructed entirely of 304 stainless steel using argon arc welding. The furnace shell of vacuum chamber 1 employs a double-layer water-cooled structure to ensure the furnace shell temperature does not exceed 40℃. Vacuum chamber 1 is a horizontal structure, with a vacuum flange 3 welded to the rear. A high-vacuum valve is installed on the vacuum flange, which is then connected to a vacuum pump. The vacuum pump is a combination of a mechanical pump and a molecular pump, achieving a cold-state ultimate vacuum of 5×10⁻⁴ Pa. The vacuum chamber has inlet and outlet ports. Multiple KF interfaces are pre-installed on the top of vacuum chamber 1 for easy connection to other devices. The furnace cover 2 is a front-opening structure, manually operated, and equipped with a locking device. The furnace cover 2 has an observation window 4, and the vacuum chamber 1 has multiple observation windows 5 for easy observation of the furnace interior.

[0032] The melting mechanism includes an electrode 8 rotatably mounted on the right side of the vacuum chamber 1, and a coil 9 connected to the positive and negative terminals of the electrode 8 and wound in a spiral shape. A crucible 10 is placed inside the coil 9. The electrode 8 and the vacuum chamber 1 are sealed using a Wilson seal, ensuring reliable sealing and good insulation. Deionized water is circulated inside the coil 9 for cooling. An induction power supply is connected externally to the coil 9. This induction power supply utilizes the latest technology; the entire power supply is about the size of a computer mainframe, compact in appearance and energy-efficient. A protective sleeve made of zirconium quartz is fitted around the crucible 10, providing excellent thermal insulation. The crucible 10 can be made of various materials, such as corundum, boron nitride, graphite, and zirconium oxide, allowing selection based on the properties of the material.

[0033] The vacuum chamber 1 is equipped with an inlet valve, an outlet valve, and a pressure gauge to dynamically control the air pressure inside the vacuum chamber 1. An infrared thermometer or thermocouple is installed on the vacuum chamber 1. The 1-5V signal output by the infrared thermometer or the thermocouple signal is converted into a temperature signal by a temperature controller. The temperature controller outputs a control signal to programmatically control the temperature rise of the vacuum chamber 1. It can perform 50-segment program temperature control with accurate temperature control, adjustable heating rate, and constant temperature control, facilitating temperature control during casting.

[0034] In summary, when using this invention, a protective sleeve and a crucible 10 are placed inside the coil 9, and the material is placed inside the crucible 10. The furnace lid 2 is closed, a vacuum is drawn, and the material is heated. After the material is completely melted, a layer of slag will float on the surface. The slag scraper 14 is inserted into the liquid surface using the scraper rod 11 to scoop the slag into the scraper 14, and then transferred to the slag crucible 13. After scraping, the scraper 14 is pulled up, casting begins, and then the furnace heating is turned off. After cooling, the material is removed.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A slag-removing vacuum induction melting furnace, comprising a furnace frame (6) and a vacuum chamber (1) disposed on the furnace frame (6), wherein a furnace cover (2) is rotatably disposed on the front side of the vacuum chamber (1); characterized in that, It also includes a melting mechanism and a vacuum slag removal mechanism (7). The heating end of the melting mechanism is located inside the vacuum chamber (1), and a crucible (10) is provided on the heating end. The vacuum slag removal mechanism (7) includes: A bellows (12) is installed on the interface reserved above the vacuum chamber (1); A flange blind plate (15) is installed on top of the bellows (12); The slag removal rod (11) passes through the flange blind plate (15), and the slag removal rod (11) and the flange blind plate (15) are sealed by a sealing ring. A slag removal spoon (14) is provided at the bottom of the slag removal rod (11). And the slag crucible (13) is set on the inner wall of the left side of the vacuum chamber (1).

2. The slag-removable vacuum induction melting furnace according to claim 1, characterized in that, The vacuum chamber (1) is made of 304 stainless steel and is welded by argon arc welding. The furnace shell of the vacuum chamber (1) adopts a double-layer water-cooled structure. The vacuum chamber (1) is a horizontal structure. A vacuum flange (3) is welded to the back of the vacuum chamber (1). A high vacuum valve is installed on the vacuum flange and then connected to the vacuum pump.

3. The slag-removable vacuum induction melting furnace according to claim 1, characterized in that, The furnace cover (2) is provided with a furnace cover observation window (4), and the vacuum chamber (1) is provided with multiple chamber observation windows (5).

4. The slag-removable vacuum induction melting furnace according to claim 1, characterized in that, The melting mechanism includes an electrode (8) that is rotatably disposed on the right side of the vacuum chamber (1), and a coil (9) that is connected to the positive and negative poles of the electrode (8) and wound in a spiral shape. The crucible (10) is disposed inside the coil (9).

5. The slag-removable vacuum induction melting furnace according to claim 1, characterized in that, An air inlet valve, an air outlet valve, and a pressure gauge are installed on the vacuum chamber (1) to dynamically control the air pressure inside the vacuum chamber (1).

6. The slag-removable vacuum induction melting furnace according to claim 1, characterized in that, An infrared thermometer or thermocouple is installed on the vacuum chamber (1). The 1-5V signal output by the infrared thermometer or the thermocouple signal is converted into a temperature signal by a temperature control instrument. The temperature control instrument outputs a control signal to control the temperature rise of the vacuum chamber (1).

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