Radio frequency plasma powder spheroidizing device

Abstract

The utility model discloses a radio frequency plasma powder spheroidizing device, which relates to the technical field of spherical powder forming equipment and comprises a plasma torch reaction chamber, and a reaction cavity is arranged in the reaction chamber. The device further comprises a radio frequency coil. A nozzle assembly is mounted on the reaction chamber top plate; an inverted-cone-shaped guide plate is arranged at the bottom of the reaction cavity, and a material collecting assembly capable of being transversely pulled away is arranged below the guide plate. The device is simple in structure and reliable in function, powder to be treated and working gas are injected into the reaction cavity through the nozzle assembly, enter a molten state after being heated and are in a spherical shape under the action of surface tension; and after being cooled, the powder falls on the flow guide plate and is collected to enter the box body, the box body which is cooled by the first cooling plate cools the spherical powder which already falls into the material collecting assembly, so that the spherical powder which falls in sequence is prevented from being adhered to one another, the forming probability of planetary powder is reduced, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spherical powder forming equipment, in particular to a radio frequency plasma powder spheroidizing device. Background Art

[0002] Spherical powders are produced using radio frequency induction plasma. Irregularly shaped powder particles are sprayed into a plasma torch via a carrier gas through a feed gun, where they are rapidly heated and melted. Surface tension causes the molten particles to form highly spherical droplets that solidify rapidly in a very short time, resulting in a spherical powder.

[0003] In traditional technology, some spherical powders are not completely cooled and solidified when they fall to the bottom of the plasma torch, resulting in mutual squeezing and adhesion, forming planetary powders. Planetary powders are inferior powders, and if the proportion of planetary powders is too large, it will affect the quality of 3D products. Summary of the Invention

[0004] In order to overcome the problem in the above background technology that "part of the spherical powder is not completely cooled and solidified to form planetary powder, resulting in reduced product quality", the utility model provides a radio frequency plasma powder spheroidization device.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a radio frequency plasma powder spheroidization device, comprising a plasma torch reaction chamber, cooling water channels are provided in the side walls and bottom plate of the reaction chamber, and circulating cooling water is provided in the cooling water channels; a reaction cavity is provided in the reaction chamber; the device also comprises a radio frequency coil, which is sleeved on the outer periphery of the upper part of the reaction chamber; a nozzle assembly is installed on the top plate of the reaction chamber, a vacuum pump is installed on the outer wall of the reaction chamber, and the vacuum pump is connected to the reaction cavity; an inverted cone-shaped guide plate is provided at the bottom of the reaction cavity, a guide hole is provided at the center of the guide plate, and a laterally detachable aggregate assembly is provided below the guide plate, a first cooling plate is installed in the bottom plate of the reaction chamber, and the first cooling plate is placed directly below the guide hole; a cylindrical or quasi-cylindrical second cooling plate is installed at the inner wall of the reaction chamber, and the second cooling plate is in contact with the guide plate.

[0006] As a further optimization solution of the present invention, a discharge port for extracting the aggregate assembly is provided at the bottom of the side wall of the reaction chamber, and a door body for sealing the discharge port is installed at the position of the discharge port.

[0007] As a further optimized solution of the present invention, the aggregate assembly includes a box body for receiving spherical powder and abutment blocks and a press-fit structure connected to the left and right sides of the box body.

[0008] As a further optimization solution of the present invention, the reaction chamber is in the shape of a straight cylinder with a fixed diameter.

[0009] As a further optimization solution of the present invention, a guide tip is installed on the upper surface of the bottom plate of the reaction chamber, and the side wall of the guide tip is fixedly connected to the inner wall of the reaction chamber; a guide groove adapted to the guide tip is opened at the edge of the guide block.

[0010] As a further optimization solution of the present invention, two parallel guide ribs are installed on the upper surface of the bottom plate of the reaction chamber, and the openings of the gaps between the guide ribs point to the discharge port and the guide tip respectively.

[0011] As a further optimization solution of the present invention, the crimping structure is arc-shaped and its two ends are fixedly connected to the box body respectively, and the outer wall of the crimping structure is adapted to the inner surface of the door body; the door body is an arc-shaped plate-like structure.

[0012] As a further optimization scheme of the present invention, the box body is a rectangular structure with no top and a bottom, and the side wall of the box body close to the abutment block includes a first vertical plate and a second vertical plate, the first vertical plate and the second vertical plate are connected by a hinge and a torsion spring is installed at the hinge position; the diversion hole is square and adapted to the opening of the box body.

[0013] As a further optimization solution of the present invention, the second vertical plate is installed above the first vertical plate, and the lower surface of the guide plate is provided with an adaptive arc groove for the rotation and rebound of the second vertical plate.

[0014] As a further optimization solution of the present invention, the heat dissipation end of the first cooling plate is inserted into the cooling water channel and contacts the cooling water; the heat dissipation end of the second cooling plate is inserted into the cooling water channel and contacts the cooling water.

[0015] In summary, the benefits of the present invention are: the present invention has a simple structure and reliable functions, the powder to be processed and the working gas are injected into the reaction chamber through the nozzle assembly, enter a molten state after heating, and present a spherical shape under the action of surface tension; after the powder is cooled, it falls on the guide plate and gathers into the box body, and the box body, which is cooled by the first cooling plate, cools the spherical powder that has fallen into the aggregate assembly, thereby avoiding mutual adhesion between the spherical powders that fall one after another, reducing the probability of forming planetary powder, and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application is further described below with reference to the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2Schematic diagram of the installation position and structure of the aggregate components;

[0019] Figure 3 It is a top view of the aggregate component in the installed state;

[0020] Figure 4 This is a top view of the door body and the press-fit structure;

[0021] Figure 5 Schematic diagram of the connection structure between the first vertical plate and the second vertical plate of the box;

[0022] Figure 6 It is a schematic diagram of the deflector when viewed from above.

[0023] Description of reference numerals:

[0024] In the figure,

[0025] 1. Reaction chamber; 11. Reaction cavity; 12. Feed port; 13. Discharge port; 14. Door; 15. Guide tip; 16. Guide rib;

[0026] 2. Radio frequency coil;

[0027] 3. Nozzle assembly;

[0028] 4. Vacuum pump;

[0029] 5. Guide plate; 51. Adaptive arc groove;

[0030] 6. Aggregate assembly; 61. Box body; 611. First vertical plate; 612. Second vertical plate; 62. Abutment block; 63. Pressing structure;

[0031] 7. First cooling plate;

[0032] 8. Second cooling plate. DETAILED DESCRIPTION

[0033] Based on the above structural features of the present application, the implementation methods of the present application are further described:

[0034] Reference Figures 1 to 6 The present embodiment provides a radio frequency plasma powder spheroidization device, including a plasma torch reaction chamber 1. Cooling water channels are opened in the side walls and bottom plate of the reaction chamber 1, and circulating cooling water is provided in the cooling water channels; the cooling water channels are connected and communicated with an external water tank and a liquid pump through a water supply pipe and a drainage pipe, and the liquid pump can press the circulating cooling water in the water tank into the cooling water channel to achieve temperature control; a reaction cavity 11 is provided in the reaction chamber 1.

[0035] Reference Figure 1 and Figure 2, and also includes a radio frequency coil 2, which is sleeved on the outer periphery of the upper part of the reaction chamber 1 and fixedly connected to the outer wall of the reaction chamber 1 through a fixing frame.

[0036] Reference Figure 1 A nozzle assembly 3 is installed on the top plate of the reaction chamber 1. The nozzle assembly 3 is inserted and fixed in the feed port 12 opened on the top plate of the reaction chamber 1 and is sealed and fixed by bolts and rubber rings. A vacuum pump 4 is installed on the outer wall of the reaction chamber 1. The vacuum pump 4 is connected to the reaction chamber 11; the vacuum pump 4 is used to evacuate the reaction chamber 11 before the reaction. The nozzle assembly 3 includes a nozzle and a number of auxiliary air pipes arranged on the outer wall of the nozzle. The nozzle and the auxiliary air pipes are respectively connected and connected to the corresponding gas cylinders and air pumps. The carrier gas (such as argon) carries the powder to be treated and is injected into the reaction chamber 11 through the nozzle. The auxiliary air pipe is used to inject sheath gas (such as a mixture of argon and hydrogen), cooling gas and other required working gases into the reaction chamber 11 as needed.

[0037] Reference Figure 1 and Figure 2 , an inverted cone-shaped guide plate 5 is provided at the bottom of the reaction chamber 11, and the guide plate 5 is fixed to the bottom position of the inner wall of the reaction chamber 1 by bolts. A guide hole is provided at the center of the guide plate 5, and an aggregate assembly 6 that can be pulled out laterally is provided below the guide plate 5. After cooling, the spherical powder falls on the guide plate 5 and rolls into the aggregate assembly 6. The user can quickly remove the spherical powder by replacing the aggregate assembly 6. A first cooling plate 7 is installed in the bottom plate of the reaction chamber 1, and the first cooling plate 7 is placed directly below the guide hole. When the aggregate assembly 6 is placed below the guide plate 5, it is pressed against the first cooling plate 7. The first cooling plate 7 is used to cool the aggregate assembly 6 to prevent the spherical powder from adhering to the aggregate assembly 6; at the same time, the spherical powder that has fallen into the aggregate assembly 6 is cooled to prevent the spherical powders that have fallen one after another from adhering to each other.

[0038] Reference Figure 1 and Figure 2 A second cooling plate 8, which is cylindrical or quasi-cylindrical (e.g., a cylindrical structure formed by a plurality of rectangular straight plates), is mounted on the inner wall of the reaction chamber 1. The second cooling plate 8 contacts the guide plate 5. The second cooling plate 8 cools the guide plate 5 to prevent the spherical powder from sticking to the guide plate 5 when it collides with the spherical powder.

[0039] Reference Figure 1 and Figure 2 A discharge port 13 for extracting the aggregate assembly 6 is provided at the bottom of the side wall of the reaction chamber 1, and a door body 14 for sealing the discharge port 13 is installed at the position of the discharge port 13. The door body 14 is openable and closable (for example, connected by a hinge) and lockable (for example, connected by a spring buckle).

[0040] Reference Figure 2 and Figure 3 The aggregate assembly 6 includes a box body 61 for receiving spherical powder and abutment blocks 62 and a press-fit structure 63 connected to the left and right sides of the box body 61. The abutment blocks 62 are detachably connected to the outer wall of the box body 61 by bolts, and the press-fit structure 63 is detachably connected to the outer wall of the box body 61 by bolts.

[0041] Reference Figure 3 The reaction chamber 11 is in the shape of a straight cylinder with a fixed diameter.

[0042] Reference Figure 2 and Figure 3 A guide tip 15 is mounted on the upper surface of the bottom plate of the reaction chamber 1 (e.g., fixedly connected by bolts). The sidewall of the guide tip 15 is fixedly connected to the inner sidewall of the reaction chamber 1 (e.g., fixedly connected by bolts). A guide groove adapted for the guide tip 15 is formed at the edge of the guide block. The guide tip 15 and the guide groove are used to prevent the aggregate assembly 6 from rotating within the cylindrical reaction chamber 11. Furthermore, the crimping structure 63 can always remain aligned with the door body 14 without deflection, so that after the reaction is completed, the user can grasp the crimping structure 63 and easily remove the aggregate assembly 6.

[0043] Reference Figure 2 and Figure 3 Two parallel guide ribs 16 are installed on the upper surface of the bottom plate of the reaction chamber 1 (for example, fixedly connected by bolts), and the openings of the gaps between the guide ribs 16 point to the discharge port 13 and the guide tip 15 respectively.

[0044] Reference Figure 3 and Figure 4 The crimping structure 63 is arc-shaped and removably connected to the housing 61 at both ends via bolts. The outer wall of the crimping structure 63 mates with the inner surface of the door 14, which is a curved plate-like structure. The arc-shaped crimping structure 63 adapts to the curved door 14 and the circular reaction chamber 11, making it easier for users to grasp.

[0045] Reference Figure 3 and Figure 4 The box body 61 is a rectangular parallelepiped structure with no top and a bottom. The rectangular parallelepiped structure facilitates the box body 61 to be stacked and stored after being pulled out.

[0046] Reference Figures 4 to 6 The sidewall of the box 61 near the abutment block 62 includes a first upright plate 611 and a second upright plate 612, which are connected by a hinge with a torsion spring installed at the hinge position. The guide hole is square and matches the opening of the box 61 to prevent spherical powder from bouncing out through the gap between the bottom of the guide plate 5 and the opening of the box 61, thereby reducing production losses. The top of the guide plate 5 is rounded to accommodate the cylindrical reaction chamber 11.

[0047] Reference Figure 5 , the second vertical plate 612 is installed above the first vertical plate 611, and the lower surface of the guide plate 5 is provided with an adaptive arc groove 51 for the rotation and rebound of the second vertical plate 612. The adaptive arc groove 51 is adapted to the top of the second vertical plate 612. The height of the bottom end of the guide plate 5 is lower than the height of the top of the side wall of the box body 61 to prevent the spherical powder from bouncing out. When the user inserts the aggregate assembly 6 into the reaction chamber 11, the second vertical plate 612 is hit by the bottom end of the guide plate 5 and rotates inward. When the bottom end of the guide plate 5 is completely placed in the center of the top opening of the box body 61, the second vertical plate 612 flips and resets under the action of the torsion spring.

[0048] The first cooling plate 7 and the second cooling plate 8 are both electrically driven semiconductor heat conducting plates (e.g., Bi2Te3-Sb2Te3 and Bi2Te3-Bi2Se3 semiconductor refrigeration plates based on bismuth telluride). The heat dissipation end of the first cooling plate 7 is inserted into the cooling water channel and contacts the cooling water; the heat dissipation end of the second cooling plate 8 is inserted into the cooling water channel and contacts the cooling water. The first cooling plate 7 is used to quickly transfer heat from the aggregate assembly 6 to the cooling water for discharge, while the second cooling plate 8 is used to quickly transfer heat from the aggregate assembly 6 to the cooling water for discharge.

[0049] The present invention also includes an electrical cabinet installed on a workbench in a production workshop; a liquid pump, an air pump, a vacuum pump 4, a radio frequency coil 2, a first cooling plate 7, and a second cooling plate 8 are respectively connected to the electrical cabinet through wires and signal lines; the electrical cabinet is connected to an external power supply and an external computer through wires and signal lines, and the computer controls the start and stop of the liquid pump, the air pump, the vacuum pump 4, the radio frequency coil 2, the first cooling plate 7, and the second cooling plate 8 in the present invention through the electrical cabinet.

[0050] The utility model has a simple structure and reliable function. The powder to be processed and the working gas are injected into the reaction chamber 11 through the nozzle assembly 3, enter a molten state after being heated, and present a spherical shape under the action of surface tension; after cooling, the powder falls on the guide plate 5 and is collected into the box 61. The box 61, which is cooled by the first cooling plate 7, cools the spherical powder that has fallen into the aggregate assembly 6, thereby avoiding mutual adhesion between the spherical powders that fall successively, reducing the probability of forming planetary powders, and improving product quality.

[0051] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0052] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, direct connections, connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] To sum up, for those skilled in the art, according to the guidance of this utility model, without departing from the principles and spirit of this utility model, changes, modifications, replacements and deformations made to this utility model still fall within the scope of protection of this utility model.

Claims

1. A radio frequency plasma powder spheroidization device, characterized by: It comprises a plasma torch reaction chamber (1), wherein cooling water channels are provided in the side walls and the bottom plate of the reaction chamber (1), and circulating cooling water is provided in the cooling water channels; a reaction cavity (11) is provided in the reaction chamber (1); It also includes a radio frequency coil (2), wherein the radio frequency coil (2) is sleeved on the outer periphery of the upper portion of the reaction chamber (1); A nozzle assembly (3) is installed on the top plate of the reaction chamber (1), a vacuum pump (4) is installed on the outer wall of the reaction chamber (1), and the vacuum pump (4) is connected to the reaction cavity (11); An inverted conical guide plate (5) is provided at the bottom of the reaction chamber (11), a guide hole is provided at the center of the guide plate (5), and a laterally withdrawable aggregate assembly (6) is provided below the guide plate (5). A first cooling plate (7) is installed in the bottom plate of the reaction chamber (1), and the first cooling plate (7) is placed directly below the guide hole; a cylindrical or quasi-cylindrical second cooling plate (8) is installed at the inner side wall of the reaction chamber (1), and the second cooling plate (8) is in contact with the guide plate (5).

2. The radio frequency plasma powder spheroidization device according to claim 1, characterized in that: A discharge port (13) for extracting the material collection assembly (6) is provided at the bottom of the side wall of the reaction chamber (1), and a door (14) for sealing the discharge port (13) is installed at the position of the discharge port (13).

3. The radio frequency plasma powder spheroidization device according to claim 2, characterized in that: The aggregate assembly (6) comprises a box (61) for receiving spherical powder, and abutment blocks (62) and a press-fit structure (63) connected to the left and right sides of the box (61).

4. The radio frequency plasma powder spheroidization device according to claim 3, characterized in that: The reaction chamber (11) is in the shape of a straight cylinder with a fixed diameter.

5. The radio frequency plasma powder spheroidization device according to claim 4, characterized in that: A guide tip (15) is mounted on the upper surface of the bottom plate of the reaction chamber (1), and the side wall of the guide tip (15) is fixedly connected to the inner side wall of the reaction chamber (1); a guide groove adapted to fit the guide tip (15) is provided at the edge of the guide block.

6. The radio frequency plasma powder spheroidization device according to claim 5, characterized in that: Two parallel guide ribs (16) are installed on the upper surface of the bottom plate of the reaction chamber (1), and the openings of the gaps between the guide ribs (16) point to the discharge port (13) and the guide tip (15) respectively.

7. The radio frequency plasma powder spheroidization device according to claim 6, characterized in that: The crimping structure (63) is arc-shaped and its two ends are fixedly connected to the box body (61), and the outer wall of the crimping structure (63) is adapted to the inner surface of the door body (14); the door body (14) is an arc-shaped plate-like structure.

8. The radio frequency plasma powder spheroidization device according to claim 7, characterized in that: The box body (61) is a rectangular parallelepiped structure with no top and a bottom. The side wall of the box body (61) close to the abutment block (62) includes a first vertical plate (611) and a second vertical plate (612). The first vertical plate (611) and the second vertical plate (612) are connected by a hinge, and a torsion spring is installed at the hinge position. The diversion hole is square and is adapted to the opening of the box body (61).

9. The radio frequency plasma powder spheroidization device according to claim 8, characterized in that: The second vertical plate (612) is installed above the first vertical plate (611), and the lower surface of the guide plate (5) is provided with an adaptive arc groove (51) for the rotation and rebound of the second vertical plate (612).

10. The radio frequency plasma powder spheroidization device according to any one of claims 1 to 9, characterized in that: The heat dissipation end of the first cooling plate (7) is inserted into the cooling water channel and contacts the cooling water; the heat dissipation end of the second cooling plate (8) is inserted into the cooling water channel and contacts the cooling water.

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