A vacuum melting slag removal device

Abstract

This invention relates to a vacuum melting slag removal device, located above a melting crucible (22), comprising: a horizontal motion mechanism for driving a horizontal motion frame (4) to move horizontally; a lifting mechanism for driving the lifting frame (5) to rise and fall; and a rotating mechanism for driving a slag filter disc (14) to rotate and remove slag. The lifting mechanism is located within the horizontal motion frame (4), and the rotating mechanism is rotatably connected to the lifting mechanism. Compared with the prior art, this device uses a water-cooled and dustproof structure to protect the circuit system and moving parts, ensuring long-term operation of the equipment in high-temperature environments and improving the overall durability and operational reliability of the equipment. This invention is applicable to vacuum melting equipment, has a high degree of electrification control, is simple to operate, and has a significant slag removal effect. It is an advanced technical means to improve the production efficiency of vacuum melting and the quality of related metal products.

Description

Technical Field

[0001] This invention relates to the field of vacuum metallurgy technology, specifically to a vacuum melting and slag removal device. Background Technology

[0002] Vacuum melting technology is a specialized melting technique for achieving large-capacity, high-quality, and rapid melting. During vacuum melting, the vacuum environment significantly reduces oxide inclusions in the high-temperature molten metal and limits the amount of gas dissolved in the molten metal. Furthermore, the negative pressure vacuum environment facilitates effective degassing of raw materials in both solid and molten states, resulting in a significant improvement in the quality of metal products. Based on these advantages, vacuum melting technology is widely used in the processing and manufacturing of raw materials for high-end non-ferrous metals and advanced steel materials. In addition, vacuum melting can be combined with other technologies to directly produce products, such as the use of inert gas atomization in vacuum induction melting for the production of spherical metal powders.

[0003] Despite the numerous advantages of vacuum melting technology, some shortcomings remain in achieving clean production. The most prominent is slag removal during vacuum melting. Under vacuum, slag generated on the surface of the high-temperature molten metal in the furnace cannot be effectively filtered and thoroughly removed, leading to residual slag being carried into the next production stage. This affects the operational stability of the equipment and the quality of the metal products. Therefore, designing and equipping vacuum melting equipment with a dedicated slag removal device to achieve slag removal during the vacuum melting process, eliminating the impact of slag on product quality, and achieving maximum clean production has become a key issue that urgently needs to be addressed in the optimization and upgrading of vacuum melting equipment. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a vacuum melting slag removal device that is suitable for vacuum melting equipment, has a high degree of electrification control, is simple to operate, and has a significant slag removal effect.

[0005] The objective of this invention can be achieved through the following technical solutions: A vacuum melting slag removal device, located above a melting crucible, includes: A horizontal motion mechanism is used to drive a horizontal motion frame to move in the horizontal direction; The lifting mechanism is used to drive the lifting frame to rise and fall; The rotating mechanism is used to drive the filter disc to rotate and remove slag; The lifting mechanism is located within the horizontal motion frame, and the rotating mechanism is rotatably connected to the lifting mechanism.

[0006] Furthermore, the horizontal motion mechanism includes a horizontal motion frame, a horizontal lead screw, and a fixed end for fixing and leveling the horizontal lead screw; The fixed end is located at one end of the horizontal lead screw, and the horizontal motion frame passes through the horizontal lead screw; the horizontal lead screw is made of high-strength carbon steel; The slag removal device for smelting is fixed to the smelting equipment via a fixed end.

[0007] Furthermore, the horizontal motion mechanism also includes a horizontal motion control motor and a coupling; the horizontal motion control motor is connected to the horizontal lead screw via the coupling.

[0008] Furthermore, the horizontal lead screw is provided with a cooling water channel inside, and the cooling water channel has openings on both sides, which are connected to the cooling water inlet and outlet.

[0009] The cooling water inlet and outlet can seal the cooling water channel during the rotation of the horizontal screw. The cooling water inlet and outlet are connected to the cooling water supply pipe separately. The cooling water does not have a fixed direction. A temperature sensor is configured to monitor the temperature of the water flowing out of the horizontal screw and control the temperature of the horizontal screw below 40℃.

[0010] Furthermore, dust removal brushes are installed on both sides of the horizontal motion frame, the horizontal lead screw passes through the dust removal brushes, and the bristles of the dust removal brushes abut against the horizontal lead screw; the horizontal motion frame is covered with a dust cover.

[0011] The horizontal motion frame is installed in conjunction with the horizontal lead screw. To reduce the impact of electromagnetic heating generated by the induction coil of the melting furnace, the horizontal motion frame is made of 304 austenitic stainless steel and equipped with a special dust cover to prevent dust from entering. The horizontal motion control motor provides power for the rotation of the horizontal lead screw, driving the horizontal motion frame to move horizontally. Dust removal brushes are installed on both sides of the horizontal motion frame. The bristles of the dust removal brushes are made of fine copper wire with a wire diameter of 0.01-3 mm. The dust removal brushes can clean the dust on the horizontal lead screw as the horizontal motion frame moves.

[0012] Furthermore, the lifting mechanism includes a lifting frame and a lifting screw, with the lifting frame passing through the lifting screw.

[0013] To reduce the electromagnetic heating effect generated by the induction coil of the smelting furnace, the lifting frame is made of 304 austenitic stainless steel.

[0014] Furthermore, the lifting mechanism also includes a lifting control motor for driving the lifting frame to rise and fall, the lifting control motor being mounted on the horizontal moving frame; The lifting frame outer cover is equipped with a lifting frame dust cover.

[0015] The lifting control motor is connected to the lifting frame via a lifting screw. The side of the lifting frame has vertical grooves that can engage with vertical protrusions on the horizontal moving frame to restrict the movement trajectory of the lifting frame.

[0016] Furthermore, the rotating mechanism includes a rotatable connecting rod and a filter cake disc; one end of the connecting rod is connected to the lifting frame, and the other end is provided with a filter cake disc.

[0017] Furthermore, the lifting frame is equipped with a rotary motion control motor for driving the connecting rod to rotate.

[0018] Both the connecting rod and the filter cake disc are made of alumina ceramic. The rotary motion control motor drives the filter cake disc to rotate when it is working.

[0019] Furthermore, the filter cake tray is provided with adjacent perforated holes, a slag-collecting plate, and a mesh plate with filter cake mesh holes; A filter rake with filter slag channels is provided between the slag-collecting plate and the mesh plate; The filter tray is circular, with a diameter of 3 / 4 of the diameter of the melting crucible opening. The diameter of the filter tray is less than or equal to the inner diameter of the melting crucible. It has 2-10 perforated holes in a fan shape, and the thickness of the slag-collecting plate is 1 / 4-2 / 3 of the thickness of the filter tray. Preferably, the lifting distance of the lifting frame ensures that the filter tray 14 extends 5-10 cm below the molten metal surface. The movement distance of the horizontal moving frame is 1.5-4.5 times the outer diameter of the melting crucible.

[0020] When the filter slag plate is raised or lowered, the molten metal level can rise through the perforated holes to the top of the filter slag plate. The molten slag can be filtered by rotating or raising the filter slag plate. The electrical controls for the horizontal motion control motor, the lifting motor, and the rotary motion control motor in the vacuum melting slag removal device are all located outside the equipment.

[0021] Compared with the prior art, the present invention has the following advantages: (1) The present invention integrates a slag removal device for vacuum melting inside the vacuum melting equipment, and can implement electrical control of the slag removal device from outside the equipment, thus truly realizing the removal of molten slag in a vacuum environment; (2) The key components of the present invention are protected by water cooling, which reduces the impact of heat radiation inside the vacuum melting equipment on the moving mechanism; (3) The present invention adopts a multi-dimensional movement mode of horizontal movement, lifting and rotating, which can achieve a more thorough removal of slag in the smelting furnace; (4) The present invention adopts dustproof measures such as dust cover and dust removal brush 9 for the structural module, and protects the circuit system and moving parts in the static state and during the movement process, thereby increasing the overall durability and operational reliability of the equipment. Attached Figure Description

[0022] Figure 1 This is a front view of the slag removal device in the embodiment; Figure 2 This is a first perspective view of the slag removal device in the embodiment; Figure 3 This is a second perspective view of the slag removal device in the embodiment; Figure 4 This is a schematic diagram of the filter disc structure in the embodiment; The numbers in the diagram indicate: 1. Horizontal motion control motor; 2. Lifting control motor; 3. Rotary motion control motor; 4. Horizontal motion frame; 5. Lifting frame; 6. Fixed end; 7. Horizontal lead screw; 8. Cooling water channel; 9. Dust removal brush; 10. Cooling water inlet / outlet; 11. Coupling; 12. Lifting lead screw; 13. Connecting rod; 14. Filter cake plate; 15. Mounting hole; 16. Hollow hole; 17. Slag collection plate; 18. Filter cake channel; 19. Filter cake mesh; 20. Horizontal motion frame dust cover; 21. Lifting frame dust cover. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0024] Example A vacuum melting slag removal device, such as Figure 1-4 It includes three modules: a horizontal motion mechanism, a lifting mechanism, and a rotating mechanism.

[0025] The horizontal motion mechanism consists of a horizontal motion control motor 1, a coupling 11, a fixed end 6, a cooling water inlet / outlet 10, a horizontal motion frame 4, a horizontal lead screw 7, and a dust cover 20 for the horizontal motion frame. The horizontal motion control motor 1 is connected to the horizontal lead screw 7 via the coupling 11. The horizontal lead screw 7 is made of high-strength carbon steel. The fixed end 6 fixes and levels the horizontal lead screw 7. The fixed end 6 fixes the slag removal device as a whole on the furnace cover of the vacuum induction melting inert gas atomization equipment and places it above the melting crucible 22 inside the equipment. The horizontal lead screw 7 has a cooling water channel 8 inside, with openings on both sides connecting to the cooling water inlet / outlet 10. The cooling water inlet / outlet 10 can seal the cooling water channel 8 during the rotation of the horizontal lead screw 7. The cooling water inlet / outlet 10 is connected to a separate cooling water supply pipe. The cooling water does not have a fixed direction. A temperature sensor is configured to monitor the temperature of the water flowing out of the horizontal lead screw 7 and control the temperature of the horizontal lead screw 7 below 40℃. The horizontal motion frame 4 is installed and matched with the horizontal lead screw 7. In order to reduce the electromagnetic heating effect generated by the induction coil of the melting furnace, the horizontal motion frame 4 is made of 304 austenitic stainless steel and is equipped with a special dust cover to prevent dust from entering. The horizontal motion control motor 1 provides power for the rotation of the horizontal lead screw 7, driving the horizontal motion frame 4 to move horizontally. Dust removal brushes 9 are installed on both sides of the horizontal motion frame 4. The bristles of the dust removal brushes 9 are made of fine copper wire with a wire diameter of 0.01-1 mm. The horizontal lead screw 7 passes through the dust removal brushes 9 on both sides of the horizontal frame. The bristles of the dust removal brushes 9 contact the horizontal lead screw 7, which can clean the dust on the horizontal lead screw 7 when the horizontal motion frame 4 moves. The lifting mechanism consists of a lifting control motor 2, a lifting screw 12, a lifting frame 5, and a lifting frame dust cover 21. To reduce the electromagnetic heating effect generated by the induction coil of the smelting furnace, the lifting frame 5 is made of 304 austenitic stainless steel and is equipped with a special dust cover to prevent dust from entering. The lifting control motor 2 is mounted on the horizontal motion frame 4 and is connected to the lifting frame 5 through the lifting screw 12, driving the lifting frame 5 to rise and fall. The side of the lifting frame 5 has vertical grooves that can cooperate with the vertical protrusions on the horizontal motion frame 4 to limit the movement trajectory of the lifting frame 5. The rotating mechanism consists of a rotary motion control motor 3, a connecting rod 13, and a filter cake disc 14. The connecting rod 13 and the filter cake disc 14 are connected through mounting holes 15, and both are made of alumina ceramic. The rotary motion control motor 3 is fixed on the lifting frame 5 and connected to the upper end of the connecting rod 13. The lower end of the connecting rod 13 is connected to the filter cake disc 14. When the rotary motion control motor 3 is working, it drives the filter cake disc 14 to rotate.

[0026] The slag filter tray 14 is circular, with a diameter of 3 / 4 of the furnace opening diameter. The tray has perforated holes 16, slag filter holes, and a slag collection plate 17. There are three perforated holes 16 arranged in a fan shape. The thickness of the slag collection plate 17 is half the thickness of the tray. When the tray is raised or lowered, the molten metal level rises through the perforated holes 16 to the top of the tray. The molten slag can be filtered by rotating or raising the tray. The electrical controls for the horizontal motion control motor 1, the lifting motor, and the rotary motion control motor 3 in the vacuum melting slag removal device are all located externally to the equipment.

[0027] In this embodiment, a vacuum melting slag removal device is installed in a 250 kg-class vacuum induction melting inert gas atomizing furnace to atomize 18Ni300 mold steel powder. The furnace opening is circular. The 18Ni300 alloy contains Al and Ti elements, which easily generate oxide slag such as Al2O3 and TiO2 during melting. This can cause nozzle blockage during atomization, affecting the stability of atomization production. Furthermore, the oxides entering the metal powder cause inclusions, affecting the quality and performance of the metal powder. During the 18Ni300 melting and cleaning stage, the vacuum melting slag removal device can be used to remove slag from the surface of the molten steel. The specific working principle is as follows: In the atomization production process of 18Ni300 metal powder, the furnace is evacuated to a pressure of 2 Pa before melting, and vacuum induction melting is performed. From the start of melting until near-complete melting, to reduce the impact of heat radiation and electromagnetic induction heating on the slag removal device, an electrical control system located outside the vacuum induction melting inert gas atomization equipment can move the slag removal device to the limit position of the cooling water inlet / outlet 10. The movement distance of the horizontal motion frame 4 is 4.5 times the outer diameter of the melting crucible 22. After the metal is completely melted, the horizontal motion control motor 1 moves the slag removal device above the melting furnace. Larger slag blocks are visually aligned with the perforated holes 16, and the lifting control motor 2 lowers the lifting frame 5, causing the slag filter plate 14 to descend below the molten metal surface, allowing the slag blocks to remain floating on the surface. The rotation control motor and the lifting control motor 2 then lift the slag filter plate 14, allowing the molten metal to flow down through the slag filter channels 18, removing and filtering the surface slag. The entire slag removal process does not affect the vacuum environment inside the vacuum induction melting equipment. After slag removal, the surface of the molten metal is clean and has good fluidity. The slag filter plate 14 is lifted and moved horizontally to the limit position of the cooling water inlet / outlet 10. Because the molten slag that may cause blockage has been removed, the metal powder atomization process is successfully completed.

[0028] In summary, this device employs a water-cooling and dustproof structure to protect the circuit system and moving parts, ensuring long-term operation of the equipment in high-temperature environments and improving its overall durability and operational reliability. This invention is applicable to vacuum melting equipment, features a high degree of electrification control, is simple to operate, and has a significant slag removal effect. It is an advanced technical means to improve the production efficiency of vacuum melting and the quality of related metal products.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A vacuum melting slag removal device, characterized in that, The device is located above the melting crucible (22) and includes: A horizontal motion mechanism is used to drive the horizontal motion frame (4) to achieve horizontal movement; The lifting mechanism is used to drive the lifting frame (5) to rise and fall; A rotating mechanism is used to drive the filter cake disc (14) to rotate and remove slag; The lifting mechanism is located within the horizontal motion frame (4), and the rotating mechanism is rotatably connected to the lifting mechanism; The horizontal motion mechanism includes a horizontal motion frame (4), a horizontal lead screw (7), and a fixed end (6) for fixing and leveling the horizontal lead screw (7). The fixed end (6) is located at one end of the horizontal lead screw (7), and the horizontal motion frame (4) is mounted on the horizontal lead screw (7); The slag removal device for smelting is fixed to the smelting equipment via a fixed end (6); The lifting mechanism includes a lifting frame (5) and a lifting screw (12), wherein the lifting frame (5) is mounted on the lifting screw (12); The lifting mechanism also includes a lifting control motor (2) for driving the lifting frame (5) to rise and fall, the lifting control motor (2) being mounted on the horizontal motion frame (4); The lifting frame (5) is covered with a lifting frame dust cover (21); The rotating mechanism includes a rotatable connecting rod (13) and a filter cake disc (14); one end of the connecting rod (13) is connected to the lifting frame (5), and the other end is provided with a filter cake disc (14). The lifting frame (5) is equipped with a rotary motion control motor (3) for driving the connecting rod (13) to rotate. The filter cake tray (14) is provided with adjacent perforated holes (16), a slag collection plate (17) and a mesh plate with filter cake mesh (19); A filter rake with filter slag channels (18) is provided between the slag-collecting plate (17) and the mesh plate.

2. The vacuum melting slag removal device according to claim 1, characterized in that, The horizontal motion mechanism further includes a horizontal motion control motor (1) and a coupling (11); the horizontal motion control motor (1) is connected to the horizontal lead screw (7) through the coupling (11).

3. The vacuum melting slag removal device according to claim 1, characterized in that, The horizontal lead screw (7) is provided with a cooling water channel (8) inside. The cooling water channel (8) has openings on both sides and is connected to the cooling water inlet and outlet (10).

4. The vacuum melting slag removal device according to claim 1, characterized in that, Dust removal brushes (9) are installed on both sides of the horizontal motion frame (4), the horizontal lead screw (7) passes through the dust removal brushes (9), and the bristles of the dust removal brushes (9) abut against the horizontal lead screw (7); the horizontal motion frame (4) is covered with a horizontal motion frame dust cover (20).

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