Smelting structure for centrifugal atomization powder preparation

Abstract

The smelting structure comprises a crucible, the inner wall of the bottom of the crucible is in an inverted cone shape, a cover plate is arranged at an opening in the upper portion of the crucible, a center hole is formed in the center of the cover plate, a flow blocking valve rod is arranged in the center hole of the cover plate in a penetrating mode, and the bottom of the flow blocking valve rod is in threaded connection with a notch gasket. A through hole I and a through hole II are sequentially formed in the inner wall of the bottom of the crucible from top to bottom, the choke valve rod extends into the bottom of the crucible and is smoothly connected with the through hole I in the inner wall of the bottom of the crucible, and the through hole II in the inner wall of the bottom of the crucible is in threaded connection with a flow guide head. The flow choking valve rod and the cover plate are arranged, the bottom of the flow choking valve rod is in threaded connection with the notch gasket, the notch gasket is in a fan shape, the rotating angle of the flow choking valve rod is adjusted, the notch can be aligned to the flow guide holes with different diameters according to needs through assistance of the indication strip and the pointer, and the flow of melt is controlled; and the smelting atmosphere is controlled through an air outlet and an air inlet in the cover plate.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, specifically to a melting structure for centrifugal atomization powder production. Background Technology

[0002] Centrifugal atomization powder production technology hinges on the melting of metal raw materials. The molten metal is then guided through the bottom of an tundish until it enters a specially designed nozzle. As the molten metal is ejected at high speed from the nozzle, it is subjected to the centrifugal force of a high-speed rotating disk, thus being finely atomized into tiny droplets. These droplets rapidly cool and solidify inside the atomization tower, ultimately transforming into metal powder. In this process, the metal melting stage is undoubtedly the key step in centrifugal atomization powder preparation.

[0003] Traditional metal smelting methods often involve melting in a main crucible and then transferring the molten metal to an tundish crucible. This step is not only cumbersome, but the tundish is also prone to blockage due to heat loss during the transfer. Furthermore, the flow rate of the molten metal from the tundish nozzle is difficult to control precisely: too low a flow rate may cause nozzle blockage, while too high a flow rate may cause the molten metal to solidify on the atomizing plate instead of being atomized in time, thus accelerating the wear of the rotating disk and spindle. Worse still, adjusting the flow rate often requires changing nozzles of different sizes, which undoubtedly increases the complexity and time consumption of the operation. Additionally, when melting low-melting-point metals (such as tin, bismuth, and indium), excessive superheat may accelerate metal oxidation, adversely affecting the quality of the prepared metal powder.

[0004] Therefore, developing a melting structure for centrifugal atomization that is simple to operate, has controllable flow rate, and controllable atmosphere is of great practical significance. Utility Model Content

[0005] This invention provides a melting structure for centrifugal atomization powder production to solve the problems existing in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] A melting structure for centrifugal atomization powder production includes a crucible with an inverted conical inner wall at the bottom. A cover plate is provided at the opening at the top of the crucible, and a central hole is provided at the center of the cover plate. A flow-restricting valve rod passes through the central hole of the cover plate, and a notched gasket is threaded to the bottom of the flow-restricting valve rod. A through hole I and a through hole II are provided sequentially from top to bottom on the inner wall of the bottom of the crucible. The flow-restricting valve rod extends into the bottom of the crucible and is smoothly connected to the through hole I on the inner wall of the bottom of the crucible. A flow guide head is threaded to the through hole II on the inner wall of the bottom of the crucible.

[0008] Preferably, the notched gasket is a sector shape with a notch one-sixth of a circle.

[0009] Preferably, the guide head has a plurality of guide holes of different sizes evenly distributed around the central axis, and the diameter of the guide holes is between 1-4 mm.

[0010] Preferably, the top of the crucible opening is provided with several indicator strips corresponding to the positions of the guide holes, and the flow-blocking valve rod is fixed with a pointer above the cover plate, the position of the pointer corresponding to the position of the notch in the notch gasket.

[0011] Preferably, a limiting groove is formed on the outer wall of the crucible, and a thermocouple is engaged in the limiting groove.

[0012] Preferably, the cover plate has an air outlet and an air inlet arranged side by side, the air outlet is connected to a vacuum pump pipe, and the air inlet is connected to a gas pipe.

[0013] Preferably, the inner side of the crucible opening is provided with bevel I, and the connection between the cover plate and the crucible opening is provided with bevel II, and bevel I and bevel II fit tightly together.

[0014] Preferably, a rotary valve is installed on the top of the flow-blocking valve stem, and the rotary valve is a hexagonal fan-shaped valve.

[0015] Preferably, the crucible and cover plate are made of graphite.

[0016] This utility model has the following beneficial effects:

[0017] (1) This utility model sets up a flow-blocking valve rod and a cover plate. The bottom of the flow-blocking valve rod is threaded with a notch gasket. The notch gasket is fan-shaped. By adjusting the rotation angle of the flow-blocking valve rod and with the assistance of the indicator bar and pointer, the notch can be aligned with the guide holes of different diameters as needed. Thus, by controlling the diameter of the guide holes into which the molten liquid flows, the flow rate of the molten liquid is controlled. After the metal smelting is completed, if the bottom notch gasket is not removed, the cover plate can be opened by lifting the flow-blocking valve rod.

[0018] (2) By setting a cover plate, the air outlet and air inlet on the cover plate are connected to the vacuum pump pipe and gas pipe respectively, which can realize the vacuum melting requirements of high-purity metals and can also realize melting in different atmospheres. It is suitable for melting various metals and avoids the oxidation of low melting point metals at higher temperatures.

[0019] (3) This utility model opens a limiting slot on the outer wall of the crucible, into which a thermocouple can be inserted to detect the crucible temperature in real time and feed back the temperature information, thereby achieving temperature control. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of the crucible structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the cover plate structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the flow-blocking valve stem structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the flow guide head structure of this utility model.

[0026] In the figure, 1-crucible, 2-cover plate, 3-flow-restricting valve rod, 4-center hole, 5-notch gasket, 6-through hole I, 7-through hole II, 8-guide head, 9-guide hole, 10-indicator bar, 11-pointer, 12-limiting slot, 13-thermocouple, 14-outlet, 15-inlet, 16-vacuum pump pipe, 17-gas pipe, 18-bevel I, 19-bevel II, 20-rotary valve. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] A smelting structure for centrifugal atomization powder production, as shown in the attached figure. Figure 1-6As shown, the device includes a crucible 1 with an inverted conical bottom inner wall, which facilitates the uniform flow and effective discharge of molten metal. A cover plate 2 is provided at the opening above the crucible 1. Both the crucible 1 and the cover plate 2 are made of graphite, possessing good high-temperature resistance and chemical stability. The cover plate 2 has a gas outlet 14 and a gas inlet 15 arranged side-by-side. The gas outlet 14 is connected to a vacuum pump pipe 16 for evacuation, and the gas inlet 15 is connected to a gas pipe 17 for introducing an inert gas (argon or nitrogen). A central hole 4 is provided at the center of the cover plate 2, through which a flow-restricting valve rod 3 passes. A notched gasket 5 is threaded to the bottom of the flow-restricting valve rod 3. The notched gasket 5 is... The crucible 1 has a fan-shaped notch with a one-sixth circle notch for adjusting the flow rate of molten metal. The inner wall of the bottom of the crucible 1 has through holes I6 and II7 arranged sequentially from top to bottom. The flow-blocking valve rod 3 extends into the bottom of the crucible 1 and smoothly connects to through hole I6 on the inner wall of the bottom of the crucible 1, ensuring smooth flow of the molten metal. A guide head 8 is threadedly connected to through hole II7 on the inner wall of the bottom of the crucible 1. The guide head 8 has six guide holes 9 of varying diameters evenly distributed around its central axis (the number of guide holes can be determined according to actual production conditions; in this embodiment, six are provided). The diameter of the guide holes 9 is between 1-4 mm. In this embodiment, the guide holes 9 are arranged in a counter-clockwise direction to achieve orderly flow control.

[0029] Furthermore, in order to better adjust the flow-restricting valve rod 3 to the required position of the guide hole 9, an indicator strip 10 corresponding to the position of the six through holes is provided at the top of the opening of the crucible 1. The size of the indicator strip 10 increases sequentially in counterclockwise order to facilitate better marking of the guide hole 9. A pointer 11 is fixed above the cover plate 2 on the flow-restricting valve rod 3. The position of the pointer 11 corresponds to the position of the notch in the notch gasket 5. When it is necessary to adjust the flow rate, the pointer 11 is adjusted to the corresponding position by the flow-restricting valve rod 3, so that the notch in the gasket at the bottom of the flow-restricting valve rod 3 reaches the position of the corresponding guide hole 9, thereby achieving rapid and accurate adjustment of the flow rate.

[0030] Furthermore, in order to achieve real-time temperature monitoring, a limiting groove 12 is provided on the outer wall of the crucible 1, and a thermocouple 13 is attached to the limiting groove 12.

[0031] Furthermore, in order to achieve rapid assembly of the cover plate 2 and the crucible 1 and to ensure the sealing of the melting process, a bevel I 18 is provided on the inner side of the opening of the crucible 1, and a bevel II 19 is provided at the connection between the cover plate 2 and the opening of the crucible 1, with the bevel I 18 and the bevel II 19 fitting tightly together.

[0032] Specifically, in order to facilitate the adjustment of the flow-restricting valve stem 3, a rotary valve 20 is installed on the top of the flow-restricting valve stem 3, and the rotary valve 20 is a hexagonal fan-shaped valve.

[0033] Work process

[0034] As attached Figure 1-6 As shown, first, connect the flow guide head 8, the flow control valve rod 3 to the crucible 1, insert the thermocouple 13 into the limiting slot 12, connect all the circuits, then put in 5kg of tin ingot, cover the crucible 1 with the lid, seal the gaps with sealing mud, connect the outlet 14 to the vacuum pump pipe 16, and connect the inlet 15 to the inert gas pipe 17; first evacuate the vacuum, then introduce argon or nitrogen for protection; heat the crucible 1 with external equipment, keep the tin ingot at the temperature for 10 minutes after melting, start the atomization equipment and set the relevant parameters, rotate the flow control valve rod 3 to the required position through the indicator bar 10 and pointer 11 so that the notch of the gasket at the bottom of the flow control valve rod 3 reaches the corresponding flow guide hole 9 position, and the molten liquid flows through the flow guide hole 9 to the high-speed rotating atomization equipment for atomization.

Claims

1. A smelting structure for centrifugal atomization powder production, characterized in that, The crucible (1) has an inverted conical bottom inner wall. A cover plate (2) is provided at the top opening of the crucible (1). A central hole (4) is provided at the center of the cover plate (2). A flow-blocking valve rod (3) is passed through the central hole (4) of the cover plate (2). A notched gasket (5) is threaded to the bottom of the flow-blocking valve rod (3). A through hole I (6) and a through hole II (7) are provided on the bottom inner wall of the crucible (1) from top to bottom. The flow-blocking valve rod (3) extends into the bottom of the crucible (1) and is smoothly connected to the through hole I (6) on the bottom inner wall of the crucible (1). A flow guide head (8) is threaded to the through hole II (7) on the bottom inner wall of the crucible (1).

2. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, The notched gasket (5) is a sector-shaped notch that is one-sixth the circle in size.

3. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, The guide head (8) has several guide holes (9) of different sizes evenly distributed around the central axis, and the diameter of the guide holes (9) is between 1-4 mm.

4. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, The top of the crucible (1) opening is provided with several indicator strips (10) corresponding to the positions of the guide holes (9). The flow-blocking valve rod (3) is fixed with a pointer (11) above the cover plate (2). The position of the pointer (11) corresponds to the position of the notch in the notch gasket (5).

5. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, The outer wall of the crucible (1) has a limiting groove (12) and a thermocouple (13) is attached to the limiting groove (12).

6. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, The cover plate (2) has an air outlet (14) and an air inlet (15) arranged side by side. The air outlet (14) is connected to a vacuum pump pipe (16), and the air inlet (15) is connected to a gas pipe (17).

7. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, The crucible (1) has a bevel I (18) on the inside of the opening, and the cover plate (2) has a bevel II (19) at the connection between the crucible (1) and the cover plate (2), and the bevel I (18) and the bevel II (19) fit together tightly.

8. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, A rotary valve (20) is installed on the top of the flow-blocking valve stem (3), and the rotary valve (20) is a hexagonal fan-shaped valve.

9. The smelting structure for centrifugal atomization powder production according to claim 1, characterized in that, The crucible (1) and the cover plate (2) are both made of graphite.

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