Plasma gun mounting assembly and plasma rotating atomization device

Abstract

The utility model provides a kind of plasma gun mounting assembly and plasma rotary atomization equipment, including mounting bracket, and mounting plate, plasma gun is connected with mounting bracket by mounting plate, and the position and angle of plasma gun relative to mounting bracket are adjustable;The mounting plate includes mounting plate bottom plate, mounting plate side plate, the mounting plate bottom plate is connected with mounting plate side plate, the waist type hole is opened on the mounting plate bottom plate, the mounting bracket connecting hole is opened on the mounting bracket, the mounting bracket connecting hole is aligned with waist type hole and is provided with locking member in both thereof.In the application, the mounting angle of plasma gun is adjusted by mounting plate, the kinetic energy of inert gas atom is divided into two direction vectors, one of which coincides with the axis of the bar stock, and the other perpendicular direction vector coincides with the centrifugal force of bar stock molten liquid, which can form more and finer powder by strengthening the centrifugal force of molten liquid, and improve the yield of fine powder.

Description

Technical Field

[0001] This utility model relates to the field of novel metal powder metallurgy technology, and in particular to a plasma gun mounting assembly and a plasma rotary atomizing device. Background Technology

[0002] Plasma rotating electrode atomization powder production process can produce all conductive metal powders. The produced powders are of high quality, but the low yield of fine powder (<53μm) leads to high powder costs and selling prices, severely limiting the market. Therefore, improving the yield of fine powder is the key to plasma rotating electrode atomization powder production process.

[0003] In existing plasma rotating electrode atomization powder making equipment, the plasma gun is installed with its axis aligned with the axis of the rod. During powder making, the plasma arc generated by the plasma gun melts the rod. After the rod melts into small droplets, it is thrown apart by the centrifugal force of rotation and cools during its flight in the atomization chamber to form fine powder.

[0004] The existing technology has the following technical defects: the plasma gun axis is installed in alignment with the rod axis and the fixed position of the plasma gun cannot be adjusted. During powder production, the high-speed argon gas atoms ejected by the plasma gun impact the rod in a straight line, and the kinetic energy is completely dissipated and not utilized. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a plasma gun mounting assembly and a plasma rotary atomizing device, which adjusts the mounting angle of the plasma gun so that the fine powder can be separated perpendicular to the axis of the shaft system, thereby improving the yield of fine powder.

[0006] To achieve the above objectives, this utility model provides a plasma gun mounting assembly, including a mounting bracket and a mounting plate. The plasma gun is connected to the mounting bracket via the mounting plate, and the position and angle of the plasma gun relative to the mounting bracket are adjustable. The mounting plate includes a base plate and a side plate, which are connected. The base plate has a slotted hole, and the mounting bracket has a mounting bracket connection hole. The mounting bracket connection hole is aligned with the slotted hole, and a locking element is provided between them. The side plate has an arc-shaped hole and a rotation center hole. The plasma gun is provided with a rotating connector and a limiting connector. The rotating connector is hinged to the rotation center hole, and the limiting connector is disposed in the arc-shaped hole to limit the rotation angle of the plasma gun.

[0007] Preferably, the extension direction of the waist-shaped hole is parallel to the horizontal plane.

[0008] Preferably, the rotation angle of the plasma gun is 45° to 65°.

[0009] To achieve the above or other objectives, this utility model also discloses a plasma rotary atomizing device, including the aforementioned plasma gun mounting assembly, as well as an atomizing chamber, a rod, a rod rotation assembly, and a drive assembly. The rod is detachably mounted on the rod rotation assembly. Both the rod and the plasma gun are located in the atomizing chamber. The rod is connected to a plasma power anode, and the plasma gun is connected to a plasma power cathode. The drive assembly is connected to the rod rotation assembly or to the plasma gun mounting assembly.

[0010] Preferably, the bar rotation assembly includes an electric spindle and a mechanical shaft. The electric spindle is connected to one end of the mechanical shaft to drive the rotation of the mechanical shaft. A mechanical shaft connection hole is provided on the other end of the mechanical shaft away from the electric spindle, and the bar is detachably mounted on the mechanical shaft through the mechanical shaft connection hole. The plasma power anode is connected to the bar through the mechanical shaft.

[0011] Preferably, the mechanical shaft connection hole is a threaded hole, and the end of the bar stock is provided with threads. The bar stock is detachably connected to the mechanical shaft through the threads and the threaded hole.

[0012] Preferably, the atomizing chamber is filled with an inert gas.

[0013] Preferably, a first through hole is provided on the side wall of the atomizing chamber, through which the rod enters the atomizing chamber; a second through hole is provided on the other side wall of the atomizing chamber, through which the mounting bracket passes, and a sealing element is provided between the mounting bracket and the second through hole.

[0014] Preferably, the mounting bracket is cylindrical.

[0015] As described above, the plasma gun mounting assembly and plasma rotary atomizing device involved in this utility model have the following beneficial effects:

[0016] In this invention, the plasma gun uses inert gas as the plasma carrier. Inert gas atoms themselves possess a certain linear velocity, even reaching supersonic speeds. In this application, the mounting angle of the plasma gun is adjusted via a mounting plate, dividing the kinetic energy of the inert gas atoms into two directional vectors. One vector coincides with the axis of the molten rod, causing it to dissipate; the other, perpendicular to the axis, coincides with the centrifugal force of the molten rod, strengthening the centrifugal force of the molten liquid. Since the formation of fine powder from the molten rod is proportional to the centrifugal force on the liquid, the molten rod can form more and finer powder, improving the yield of fine powder. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the plasma rotary atomizing device involved in this utility model;

[0018] Figure 2yes Figure 1 A schematic diagram of the middle edge AA;

[0019] Figure 3 yes Figure 1 A schematic diagram of the middle edge BB.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Electric spindle; 2. Mechanical spindle; 3. Bar stock; 31. Bar stock center axis; 4. Plasma gun; 5. Mounting plate; 51. Mounting plate side plate; 510. Rotation center hole; 511. Arc hole; 52. Mounting plate bottom plate; 520. Waist-shaped hole; 521. Locking element; 6. Mounting bracket; 7. Atomization chamber. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0023] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0024] This utility model provides a plasma gun mounting assembly, which, for ease of description, is as follows: Figure 1 As shown, the left and right directions of the paper are defined as left and right, the top and bottom directions as top and bottom, and the front and back directions as front and back.

[0025] like Figures 1-3As shown, this utility model provides a plasma gun mounting assembly, including a mounting bracket 6 and a mounting plate 5. The plasma gun 4 is connected to the mounting bracket 6 via the mounting plate 5, and the position and angle of the plasma gun 4 relative to the mounting bracket 6 are adjustable. The mounting plate 5 includes a mounting plate base plate 52 and a mounting plate side plate 51. The front end of the mounting plate base plate 52 is fixedly connected to the right end of the mounting plate side plate 51. A waist-shaped hole 520 is provided through the mounting plate base plate 52 in the left-right direction. A mounting bracket connection hole is provided on the left end face of the mounting bracket 6. The mounting bracket connection hole is aligned with the waist-shaped hole 520, and a locking member 521 is provided in both. An arc-shaped hole 511 and a rotation center hole 510 are provided through the mounting plate side plate 51 in the front-back direction. A rotating connector and a limiting connector are provided on the plasma gun 4. The rotating connector is hinged to the rotation center hole 510, and the limiting connector is provided in the arc-shaped hole 511 to limit the rotation angle of the plasma gun 4.

[0026] The plasma gun mounting assembly of this utility model includes a mounting bracket 6 with mounting bracket connection holes, and a mounting plate base 52 with an oblong hole 520. The oblong hole 520 is aligned with the mounting bracket connection hole, and a locking element 521 is provided between them, thus enabling the position adjustment of the mounting plate 5 relative to the mounting bracket 6 in the front-back direction. The mounting plate side plate 51 has an arc-shaped hole 511 and a rotation center hole 510. The plasma gun 4 is equipped with a rotating connector and a limiting connector. The rotating connector is hinged to the rotation center hole 510, and the limiting connector is located in the arc-shaped hole 511, thus enabling the angle adjustment of the plasma gun 4 relative to the mounting plate 5. By adjusting the position and angle of the plasma gun 4 relative to the mounting bracket 6 through the mounting plate 5, the inert gas atoms ejected by the plasma gun 4 have two directional vectors, strengthening the centrifugal force of the molten droplets, forming more and finer powder, and improving the yield of fine powder. The locking element 521 can be a screw, bolt, or locating pin.

[0027] Preferred, such as Figure 1 , Figure 3 As shown, the extension direction of the waist-shaped hole 520 is parallel to the horizontal plane. In this embodiment, the length of the waist-shaped hole 520 extends in the front-to-back direction, the width extends in the up-down direction, and the depth extends in the left-to-right direction. The depth of the waist-shaped hole 520 is the same as the thickness of the mounting plate base 52. Since the length of the waist-shaped hole 520 extends in the front-to-back direction, the plasma gun 4 can be adjusted in the front-to-back direction relative to the mounting bracket 6. Furthermore, there are two waist-shaped holes 520, which are arranged parallel to each other in the up-down direction on the mounting plate base 52.

[0028] Preferred, such as Figure 1As shown, the rotation angle of the plasma gun 4 is 45° to 65°. In this embodiment, the rotation angle of the plasma gun 4 is the angle between the nozzle of the plasma gun 4 and the central axis 31 of the rod. When the nozzle of the plasma gun 4 is parallel to the central axis 31 of the rod, that is, when the nozzle of the plasma gun 4 is directly facing the end face of the rod 3, the kinetic energy carried by the plasma impacts the rod 3 in a straight line, and the kinetic energy is completely dissipated. When the nozzle of the plasma gun 4 is perpendicular to the central axis 31 of the rod, that is, when the nozzle of the plasma gun 4 is directly facing the outer circumferential surface of the rod 3, the kinetic energy carried by the plasma impacts the rod 3 perpendicularly, and the melting of the rod 3 may be difficult. Therefore, the rotation angle of the plasma gun 4 is set to 45° to 65° (counterclockwise direction is positive), preferably 60°. Correspondingly, the rotation angle of the plasma gun 4 can also be set to -45° to -65° (counterclockwise direction is positive). At this point, the kinetic energy carried by the plasma ejected from the plasma gun 4 can both melt the rod material 3 and provide centrifugal force to the fine powder droplets. In this embodiment, the rotation angle of the plasma gun 4 is determined according to the magnitude of the plasma power supply current and the dispersion of the flame.

[0029] To achieve the above or other objectives, this utility model also discloses a plasma rotary atomizing device, such as... Figure 1 As shown, the assembly includes the aforementioned plasma gun mounting assembly, as well as an atomizing chamber 7, a rod 3, a rod rotation assembly, and a drive assembly. The rod 3 is detachably mounted on the right end face of the rod rotation assembly. Both the rod 3 and the plasma gun 4 are located within the atomizing chamber 7. The rod 3 is connected to a plasma power anode, and the plasma gun 4 is connected to a plasma power cathode. The drive assembly is connected to the rod rotation assembly or to the plasma gun mounting assembly. In this embodiment, the purpose of the drive assembly is to ensure the continuous generation of an electric arc between the plasma power anode and the plasma power cathode as the rod 3 continues to melt, and to maintain a constant distance between the plasma gun 4 and the rod 3 through the drive assembly.

[0030] Preferred, such as Figure 1 As shown, the bar stock rotation assembly includes an electric spindle 1 and a mechanical shaft 2. The left end of the electric spindle 1 is connected to the left end of the mechanical shaft 2 via a coupling, which drives the rotation of the mechanical shaft 2. A mechanical shaft connection hole is provided on the right end of the mechanical shaft 2, through which the bar stock 3 is detachably mounted on the mechanical shaft 2. The plasma power anode is connected to the bar stock 3 via the mechanical shaft 2. In this embodiment, a carbon brush is provided on the outer circumferential surface of the mechanical shaft 2 for connecting the plasma power anode, thereby achieving the connection between the plasma power anode and the bar stock 3.

[0031] Furthermore, in this embodiment, the mechanical shaft connection hole is a threaded hole, and the end of the bar 3 is provided with threads. The bar 3 is detachably connected to the mechanical shaft 2 through the threads and the threaded hole.

[0032] Preferably, the atomization chamber 7 is filled with an inert gas. In this embodiment, argon is used as the inert gas. In other embodiments, the choice of inert gas depends on the material of the rod. Since there are gaps between the rod rotating assembly, the plasma gun mounting assembly, and the side wall of the atomization chamber 7, the inert gas needs to be continuously filled into the atomization chamber 7 to ensure that the atomization chamber 7 is under a slight positive pressure and to prevent air from entering the interior of the atomization chamber 7.

[0033] Preferred, such as Figure 1 As shown, a first through hole is provided on the left side wall of the atomization chamber 7, through which the rod 3 enters the atomization chamber 7; a second through hole is provided on the right side wall of the atomization chamber 7, through which the mounting bracket 6 passes, and a sealing element is provided between the mounting bracket 6 and the second through hole. In this embodiment, the rod 3 and the plasma gun 4 are at the same horizontal height, or the horizontal height of the plasma gun 4 is slightly higher than the horizontal height of the rod 3 (based on the fact that the plasma gun 4 can impact the end face of the rod 3 when rotating), to ensure that the arc between the plasma power supply anode and the plasma power supply cathode is continuously generated.

[0034] Furthermore, in this embodiment, the mounting bracket 6 is cylindrical, and a sealing element is provided between the mounting bracket 6 and the second through hole to reduce the leakage of inert gas in the atomization chamber 7.

[0035] The working principle of the plasma gun mounting assembly and plasma rotary atomizing device involved in this utility model is as follows:

[0036] First, the operator follows the instructions in the appendix. Figures 1-3 Based on the descriptions of the aforementioned components, the components are installed. The rod 3 is installed on the left side of the atomizing chamber 7, and the plasma gun 4 is installed on the right side of the atomizing chamber 7. The plasma gun 4 is then mounted onto the mounting plate 5 via a rotating connector, a limiting connector, an arc-shaped hole 511, and a rotation center hole 510, and the rotation angle of the plasma gun 4 is adjusted. The mounting plate 5 is then connected to the mounting frame 6 via a waist-shaped hole 520, a mounting bracket connection hole, and a locking member 521, and the front-to-back position of the mounting plate 5 on the mounting frame 6 is adjusted.

[0037] Next, the atomization chamber 7 is evacuated first, and then argon gas is introduced. The plasma gun 4 is started to generate an electric arc, and at the same time, the electric spindle 1 is started to rotate. The electric spindle 1 drives the rod 3 to rotate at high speed through the mechanical shaft 2. The electric arc breaks down the argon gas, causing the argon gas to generate argon atoms, which impact the end of the rod 3 to generate high temperature. The high temperature gradually melts the rod 3. The molten metal liquid is thrown out under the action of centrifugal force. The molten droplets spheroidize and solidify during the flight to form spherical powder.

[0038] Finally, as the bar stock 3 gradually melts, the drive assembly moves the bar stock 3 toward the plasma gun 4, or the drive assembly moves the plasma gun 4 toward the bar stock 3, maintaining the distance between the bar stock 3 and the plasma gun 4 to ensure the continuous generation of the electric arc.

[0039] Because there is a certain angle between the plasma gun 4 and the central axis 31 of the rod, the kinetic energy of the argon atoms is divided into two directional vectors. One vector coincides with the central axis 31 of the rod and is scattered and annihilated to melt the rod 3. The other perpendicular vector coincides with the centrifugal force of the molten droplet, which strengthens the centrifugal force, thereby obtaining a finer powder.

[0040] This utility model relates to a plasma gun mounting assembly and a plasma rotary atomizing device, which enhances the centrifugal force of the molten droplets. At the same rotation speed, it can improve the yield of fine powder, reduce costs and selling prices, thereby achieving better economic benefits and market share. It is applicable to the field of producing 3D printing metal powder using plasma rotary atomizing equipment (PREP equipment).

[0041] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0042] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A plasma gun mounting assembly, characterized in that: Includes a mounting bracket (6) and a mounting plate (5). The plasma gun (4) is connected to the mounting bracket (6) via the mounting plate (5), and the position and angle of the plasma gun (4) relative to the mounting bracket (6) are adjustable. The rotation angle of the plasma gun (4) is adjusted and set according to the magnitude of the plasma power supply current and the dispersion of the flame. The mounting plate (5) includes a mounting plate base plate (52) and a mounting plate side plate (51). The mounting plate base plate (52) is connected to the mounting plate side plate (51). The mounting plate base plate (52) has a waist-shaped hole (520). The mounting bracket (6) has a mounting bracket connection hole. The mounting bracket connection hole is aligned with the waist-shaped hole (520) and a locking element (521) is provided in both. The mounting plate side plate (51) is provided with an arc-shaped hole (511) and a rotation center hole (510). The plasma gun (4) is provided with a rotating connector and a limiting connector. The rotating connector is hinged to the rotation center hole (510). The limiting connector is set in the arc-shaped hole (511) to limit the rotation angle of the plasma gun (4).

2. The plasma gun mounting assembly according to claim 1, characterized in that: The extension direction of the waist-shaped hole (520) is parallel to the horizontal plane.

3. The plasma gun mounting assembly according to claim 1, characterized in that: The rotation angle of the plasma gun (4) is 45°~65°.

4. A plasma rotary atomizing device, comprising the plasma gun mounting assembly as described in any one of claims 1-3, characterized in that: It also includes an atomization chamber (7), a rod (3), a rod rotation assembly, and a drive assembly. The rod (3) is detachably mounted on the rod rotation assembly. The rod (3) and the plasma gun (4) are both located in the atomization chamber (7). The rod (3) is connected to a plasma power anode, and the plasma gun (4) is connected to a plasma power cathode. The drive assembly is connected to the rod rotation assembly or to the plasma gun mounting assembly. The rod (3) and the plasma gun (4) are at the same horizontal level, or the horizontal level of the plasma gun (4) is slightly higher than that of the rod (3), so that the plasma gun (4) can impact the end face of the rod (3) when rotating, ensuring that the electric arc between the plasma power anode and the plasma power cathode is continuously generated. The drive assembly is used to keep the distance between the plasma gun (4) and the rod (3) unchanged, ensuring the continuous generation of the electric arc between the plasma power anode and the plasma power cathode.

5. The plasma rotary atomizing device according to claim 4, characterized in that: The bar rotation assembly includes an electric spindle (1) and a mechanical shaft (2). The electric spindle (1) is connected to one end of the mechanical shaft (2) to drive the rotation of the mechanical shaft (2). A mechanical shaft connection hole is provided on the other end of the mechanical shaft (2) away from the electric spindle (1). The bar (3) is detachably mounted on the mechanical shaft (2) through the mechanical shaft connection hole. The plasma power anode is connected to the bar (3) through the mechanical shaft (2).

6. The plasma rotary atomizing device according to claim 5, characterized in that: The mechanical shaft connection hole is a threaded hole, and the end of the bar (3) is provided with threads. The bar (3) is detachably connected to the mechanical shaft (2) through the threads and the threaded hole.

7. The plasma rotary atomizing device according to claim 4, characterized in that: The atomization chamber (7) is filled with inert gas.

8. The plasma rotary atomizing device according to claim 4, characterized in that: A first through hole is provided on the side wall of the atomizing chamber (7), and the bar (3) passes through the first through hole and enters the atomizing chamber (7); a second through hole is provided on the other side wall of the atomizing chamber (7), and the mounting bracket (6) passes through the second through hole, and a sealing element is also provided between the mounting bracket (6) and the second through hole.

9. The plasma rotary atomizing device according to claim 8, characterized in that: The mounting bracket (6) is cylindrical.

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