A light alloy electric smelting and pouring furnace with electromagnetic stirring function

Abstract

The utility model relates to a light alloy electric smelting and pouring furnace with an electromagnetic stirring function, comprising a furnace body with a heat-insulating layer and a crucible installed on the furnace body, an electric heating layer located between the furnace body and the crucible and at the bottom, a sealed furnace cover closes a pouring furnace port and provides a mounting platform for various components of the pouring furnace, an upper and lower middle baffles are provided in the inner cavity of the crucible to divide the crucible into different cavities, an electromagnetic stirrer is located in the middle cavity of the crucible, the pouring furnace is also provided with a thermometer and a liquid level probe for limiting the temperature and liquid level of the pouring melt, a leak meter is installed at a low position on the inner side of the furnace body, when working, a light alloy ingot is put into the pouring furnace through a feeding port for refining, slag and impurities are filtered through the upper and lower baffles, and the melt is melted and homogenized through the electromagnetic stirrer, when the temperature and liquid level reach the set value, a controller starts a pouring pump, and the melt is quantitatively poured through the pouring system, the furnace has the characteristics of high integration, large stirring area, good smelting quality, energy saving, low noise and high efficiency.

Description

Technical Field

[0001] The utility model relates to a high-quality smelting and pouring furnace, which is used for the preparation of high-quality light alloy melts (especially ultra-high strength and toughness light alloys), and provides high-quality refined light alloy melts for the casting field of light alloy parts production in the military industry, aerospace and other fields, and belongs to the field of high-quality light alloy smelting preparation and quantitative integrated pouring. Background Art

[0002] The traditional light alloy smelting process is generally carried out under the protection of protective gas (mixed gas of SF6+N2) and / or refining agent. During the smelting process, whether the furnace structure design is reasonable and whether the melt is fully protected will directly affect the quality of the supplied melt and the smelting cost.

[0003] In order to overcome the influence of various internal and external factors and equipment investment costs, the utility model adopts electromagnetic stirring technology and applies it to the smelting process of light alloys, increases the stirring surface to reduce the use of refining agents, and at the same time, through the structure of the crucible partition cavity, makes the smelting slag and oxidized impurities enter the casting system as little as possible. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that a stirring pump is commonly used to stir light alloy melts. Since the stirring is concentrated in a local area and the efficiency is low, it is difficult to stir evenly, resulting in solvent waste, many impurities, poor heat conduction in the crucible, difficulty in supplying high-quality melts, and difficulty in achieving equipment assurance.

[0005] In order to achieve the above purpose, the design idea of ​​the utility model is: two plate-shaped electromagnetic stirrers of the same model are welded to the middle cavity of the crucible, the magnetic conductive layers of the two electromagnetic stirrers and the side of the crucible form a stirring chamber, and the melt is fully stirred over a large area, so as to realize full utilization of the refining agent, rapid heat conduction in the melt, and full separation of impurities and slag.

[0006] According to the above design concept, the design concept of a light alloy melting and pouring furnace with electromagnetic stirring function in the utility model is as follows (see Figure 1 ).

[0007] The utility model comprises a furnace body (1) with a heat-insulating layer, a crucible (2), a sealed furnace cover (4), an upper baffle (5), a lower baffle (6), a middle baffle plate (7), a pouring system (10), an electric heating layer (11), a working liquid level line (8), a feeding port (9), a leak detector (3), a liquid level probe (12), a thermometer (13), an electromagnetic stirrer (14) and a controller. The crucible (2) is installed in the furnace body (1) with a heat-insulating layer, the electric heating layer (11) is located around the crucible (2) and the furnace body (1) and at the furnace bottom to heat the crucible by radiation, the sealed furnace cover (4) comprises a crucible cover layer and a furnace body cover layer, and the sealed furnace cover (4) is provided with a sensor mounting hole and a pouring system mounting hole.

[0008] An upper baffle (5), a lower baffle (6), and a middle baffle plate (7) are welded transversely inside the crucible (2); the upper baffle plate (5) is located between the lower baffle plate (6) and the middle baffle plate (7); the baffle plate (7) is plate-shaped near the electromagnetic stirrer (14) and is mounted on the inner wall of the crucible (2) by spot welding on both sides; the cooling system and power supply system ports of the electromagnetic stirrer (14) are led out through the opening of the sealed furnace cover (4); the magnetic conductive layers of the two electromagnetic stirrers (14) are opposite to each other and are located in the middle of the crucible (2); and the insertion depth is not less than three fifths of the depth of the crucible (2).

[0009] The coil of the electromagnetic stirrer is a tubular structure, and cooling water can be introduced into the interior to cool the coil during operation. The inlet and outlet ports of the induction coil are introduced through an insulating sealing flange fixed to the sealing furnace cover (4).

[0010] The pouring system (10) is fixed to the sealed furnace cover (4) via a mounting flange and is located at the end of the far feed port (9). The inlet of the pouring system (10) is located at 300±10 (mm) of the lower surface of the sealed furnace cover (4). The liquid level probe (12) and the thermometer (13) are arranged on the side close to the pouring system (10). The working liquid level line (8) is arranged at 120±20 (mm) of the lower surface of the sealed furnace cover (4). The pouring system (10) is provided with a temperature control layer. The sealed furnace cover (4) and each mounting part are kept in a sealed and heat-insulated state.

[0011] The controller is connected to the liquid level probe and the thermometer through signals. The controller is associated with the control system of the die-casting machine and is combined with the pouring furnace to accurately plan the production process of the light alloy. When the light alloy melt is quantitatively poured, it is connected to the die-casting machine mold through the pouring system, and the sealed furnace cover and various mounting parts are strictly sealed to isolate the melt inside the crucible from the outside world, so that the pouring process is circulated under the set working liquid level.

[0012] Compared with the existing pouring pump stirring, the present invention has the following effects:

[0013] 1. The use of double electromagnetic stirrers to form a stirring chamber can ensure the stability and reproducibility of various smelting process parameters, and ensure the quality and preparation of light alloy melts;

[0014] 2. The plate-shaped stirrer structure design allows for more complete stirring during the smelting process, and a more compact smelting furnace structure. The light alloy melt smelted in the crucible can be quickly transported into the die of the die-casting machine, achieving full utilization of the refining agent, rapid heat conduction in the melt, and full separation of impurities and slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a front view of the working principle diagram of the pouring furnace of the utility model.

[0016] In the figure: 1. Furnace body with thermal insulation layer 2. Crucible 3. Leakage detector 4. Sealed furnace cover 5. Upper slag leakage plate 6. Lower impurity leakage plate 7. Middle material blocking plate 8. Working liquid level line 9. Feeding port 10. Pouring system 11. Electric heating layer 12. Liquid level probe 13. Thermometer 14. Electromagnetic stirrer × 2. DETAILED DESCRIPTION

[0017] Below Figure 1 The front view of the working principle diagram of the pouring furnace of the utility model is further explained:

[0018] During operation, the controller and the heating power supply are started to heat the crucible by thermal radiation. The crucible transfers the heat to the light alloy ingot inside it, so that the light alloy ingot is heated and melted. The light alloy ingot is continuously melted into each chamber of the crucible. When the alloy ingot enters a semi-solid state of about 50%, the electromagnetic stirrer is started to accelerate the melting. At the same time, the thermometer measures the temperature inside the crucible, and the electromagnetic stirrer is cooled by cooling water. When the melt temperature reaches the required set process temperature and the liquid level probe detects that the melt reaches the set liquid level, the controller starts the pouring pump to siphon the alloy liquid into the mold connected to the pouring system to complete the quantitative pouring process of the light alloy melt, and cooperates with the feeding port to regularly replenish the alloy ingots and refining agents to complete the reciprocating cycle of light alloy smelting and pouring. The upper baffle isolates the slag, the lower baffle isolates the impurities, and the middle baffle isolates the alloy ingots, which together ensure the quality of the melt entering the pouring system.

[0019] The utility model discloses a light alloy smelting and pouring furnace with electromagnetic stirring function, which has high system integration, sufficient stirring, easy guarantee of melt quality, sufficient refining test, good separation effect of slag and impurities, and high smelting efficiency.

Claims

1. A light alloy electric smelting and pouring furnace with electromagnetic stirring function, characterized in that: The invention comprises a furnace body (1) with a heat-insulating layer, a crucible (2), a sealed furnace cover (4), an upper baffle (5), a lower baffle (6), a middle baffle plate (7), a pouring system (10), an electric heating layer (11), a working liquid level line (8), a feeding port (9), a leak detector (3), a liquid level probe (12), a thermometer (13), an electromagnetic stirrer (14) and a controller, wherein the crucible (2) is installed in the furnace body (1) with a heat-insulating layer, the electric heating layer (11) is located around the crucible (2) and the furnace body (1) and at the bottom of the furnace, the sealed furnace cover (4) comprises a crucible cover layer and a furnace body cover layer, and the sealed furnace cover (4) is provided with a sensor mounting hole and a pouring system mounting hole.

2. The light alloy electric smelting and pouring furnace with electromagnetic stirring function according to claim 1, characterized in that: An upper baffle (5), a lower baffle (6), and a middle baffle plate (7) are welded transversely inside the crucible (2); the upper baffle plate (5) is located between the lower baffle plate (6) and the middle baffle plate (7); the baffle plate (7) is plate-shaped near the electromagnetic stirrer (14) and is mounted on the inner wall of the crucible (2) by spot welding on both sides; the cooling system and power supply system ports of the electromagnetic stirrer (14) are led out through the opening of the sealed furnace cover (4); the magnetic conductive layers of the two electromagnetic stirrers (14) are opposite to each other and are located in the middle of the crucible (2); and the insertion depth is not less than three fifths of the depth of the crucible (2).

3. The light alloy electric smelting and pouring furnace with electromagnetic stirring function according to claim 1, characterized in that: The coil of the electromagnetic stirrer is a tubular structure, and cooling water can be introduced into the interior to cool the coil during operation. The inlet and outlet ports of the induction coil are introduced through an insulating sealing flange fixed to the sealing furnace cover (4).

4. The light alloy electric smelting and pouring furnace with electromagnetic stirring function according to claim 1, characterized in that: The pouring system (10) is fixed to the sealed furnace cover (4) via a mounting flange and is located at an end away from the feeding port (9). The inlet of the pouring system (10) is located at 300±10 (mm) of the lower surface of the sealed furnace cover (4). The liquid level probe (12) and the thermometer (13) are arranged on a side close to the pouring system (10). The working liquid level line (8) is arranged at 120±20 (mm) of the lower surface of the sealed furnace cover (4). The pouring system (10) is provided with a temperature control layer. The sealed furnace cover (4) and each mounting part are kept in a sealed and heat-insulated state.

5. The light alloy electric melting and pouring furnace with electromagnetic stirring function according to claim 1, characterized in that: The controller is connected to the liquid level probe and the thermometer via signals, and the controller is associated with the control system of the die-casting machine, and is combined with the pouring furnace to accurately plan the production process of the light alloy.

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