A classification device for vacuum air-atomized powder production

Abstract

The present application relates to the technical field of metal powder production, in particular to a grading device for vacuum gas atomization powder production, comprising a vacuum treatment box, a vertical feeding pipe arranged inside the vacuum treatment box, an accelerating projection pipe arranged below the vertical feeding pipe, an arc-shaped guide pipe arranged at the front end of the accelerating projection pipe, the top end of the arc-shaped guide pipe being connected with the lower end of the vertical feeding pipe, and a plurality of accelerating coils arranged outside the accelerating projection pipe. The metal powder is horizontally accelerated and projected by the magnetic field of the plurality of screening coils, and the horizontal projection distance of the metal powder with different particle sizes and weights is different, the horizontal projection distance of the metal powder with larger particle size and weight is smaller, thereby completing the grading of the metal powder, and the whole screening and grading process is carried out in the closed vacuum treatment box, so that the metal powder can be prevented from being oxidized by contacting air, and the production quality of the metal powder is improved.

Description

Technical Field

[0001] This invention relates to the field of metal powder production technology, and in particular to a grading device for vacuum atomization powder production. Background Technology

[0002] Vacuum atomization powder preparation is a method for preparing metal powders. Its principle is to use a high-pressure gas flow to atomize liquid metal into fine droplets under vacuum, and then rapidly solidify them into spherical or subspherical particles during flight. This method can produce high-quality, high-purity, and highly uniform metal powders. However, since the particle size of the solidified metal powders varies, it is necessary to separate and collect powders of different particle sizes.

[0003] Patent application number CN202022232279.X discloses a vacuum atomization alloy powder grading device, including a working platform, a shaking structure, and a grading structure. The working platform has symmetrically arranged support columns on its upper right side, with the upper ends of the support columns fixedly connected to the bottom surface of the chute. A U-shaped frame is located in the middle of the upper surface of the working platform. The shaking structure is mounted on the longitudinal plate of the U-shaped frame, with its upper end fixedly connected to the bottom surface of the hopper. A sliding strip on the right side of the hopper's bottom surface is slidably connected to the chute. The grading structure is located on the upper surface of the working platform, corresponding to the discharge port of the hopper. A control switch group is located on the front side of the working platform, with its input end electrically connected to an external power source. This vacuum atomization alloy powder grading device achieves uniform feeding of alloy powder, prevents excessive alloy powder from affecting the grading effect, and achieves high-efficiency grading of the alloy powder.

[0004] However, it separates and classifies metal powders of different particle sizes by blowing down metal powders through the airflow generated by the fan. The metal powder produced by air atomization powder production has a very small particle size, resulting in a relatively large surface area and stronger activity. In particular, metal powders containing iron, cobalt, nickel and other metals are very easily oxidized by water vapor and oxygen in the airflow during the air classification process, which reduces the quality of metal powder production. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a vacuum atomization powder classification device to solve the problem that metal powder is oxidized by air flow during the air classification process, resulting in a decrease in the production quality of metal powder.

[0006] To achieve the above objectives, the present invention provides a grading device for vacuum atomization powder production, comprising a vacuum processing chamber, wherein a vertically upward material pipe is disposed inside the vacuum processing chamber, and further comprising:

[0007] An accelerating projectile tube is disposed below the vertical feed tube. An arc-shaped guide tube is provided at the front end of the accelerating projectile tube. The top end of the arc-shaped guide tube is connected to the bottom end of the vertical feed tube. Multiple accelerating coils are nested on the outside of the accelerating projectile tube. The multiple accelerating coils are evenly arranged along the horizontal center line of the accelerating projectile tube.

[0008] A horizontal guide tube is disposed between the accelerating ejector tube and the arc-shaped guide tube. The accelerating ejector tube is connected to the bottom end of the arc-shaped guide tube through the horizontal guide tube. Screening coils are arranged parallel and symmetrically on the upper and lower sides of the horizontal guide tube. A screening opening is provided in the middle of the bottom of the horizontal guide tube. A conical guide plate is provided on the top surface of the screening coil located on the lower side of the horizontal guide tube. A screening box is provided at the bottom of the vacuum treatment box.

[0009] A feeding conveyor belt is positioned above the vertical feeding pipe. The rear end of the feeding conveyor belt is located directly above the top opening of the vertical feeding pipe. A horizontal feeding cylinder is positioned above the feeding conveyor belt. A horizontal feeding port is opened at the bottom end of the horizontal feeding cylinder. A V-shaped pusher plate is positioned on the rear side of the horizontal feeding cylinder. The V-shaped pusher plate is parallel to the top surface of the feeding conveyor belt and has a gap between them.

[0010] A unit grading box is located at the rear of the vacuum treatment box. Multiple unit grading boxes are evenly arranged end to end along the center line of the vacuum treatment box. A conical collection trough is provided at the bottom of the unit grading box.

[0011] Furthermore, a storage trough is provided below the feeding conveyor belt, and vertical feed cylinders are symmetrically arranged on the left and right sides of the feeding conveyor belt. The lower opening of the vertical feed cylinder is located at the bottom of the storage trough. A spiral feeding plate is rotatably fitted inside the vertical feed cylinder, and a feeding motor is connected to the outer end of the spiral feeding plate. A vertical feed cylinder is connected above the horizontal feed cylinder, and an inclined guide pipe is provided between the top end of the vertical feed cylinder and the top end of the vertical feed cylinder. The vertical feed cylinder and the vertical feed cylinder are interconnected through the inclined guide pipe.

[0012] Furthermore, the width of the horizontal feed port is the same as the width of the feeding conveyor belt, the width of the feeding conveyor belt is the same as the width of the vertical feed pipe, and the widths of the vertical feed pipe, the arc-shaped guide pipe, the horizontal guide pipe, and the accelerating ejector pipe are all the same. The vertical feed pipe and the accelerating ejector pipe are arranged perpendicularly to each other.

[0013] Furthermore, lifting guide frames are symmetrically arranged on the left and right sides of the V-shaped pusher plate. The V-shaped pusher plate is slidably connected to the lifting guide frames. The lifting guide frames are perpendicular to the feeding conveyor belt. Lifting screw sleeves are provided at both ends of the V-shaped pusher plate. An adjusting screw is provided in the middle of the lifting guide frame. An adjusting motor is connected to the shaft end of the adjusting screw.

[0014] Furthermore, the rear end of the vacuum treatment chamber and both ends of the unit grading chamber are provided with fitting openings, and a fitting sealing ring is provided around the middle of the fitting opening. The vacuum treatment chamber and the unit grading chamber are connected and sealed to each other through the fitting openings and the fitting sealing rings. Positioning sleeves and positioning pins are respectively provided on the outer side of the fitting openings at both ends of the vacuum treatment chamber. The positioning sleeves and the positioning pins are correspondingly arranged and their dimensions are matched.

[0015] Furthermore, multiple traction reels are arranged around the outer side of the vacuum treatment box. The traction reels are rotatably connected to the vacuum treatment box. A sealed motor is connected to the shaft end of the traction reel. The sealed motor is fixedly connected to the vacuum treatment box. A traction steel cable is wound around the outer side of the traction reel. A closed cover plate is fixedly connected to the outer end of the traction steel cable. The size of the closed cover plate matches the size of the fitting opening.

[0016] Furthermore, a horizontal collecting cylinder is provided at the lower end of the conical collecting trough, and a collecting opening is provided at the top of the horizontal collecting cylinder. The interior of the horizontal collecting cylinder is connected to the interior of the conical collecting trough through the collecting opening. A loading and unloading opening is provided at the front end of the horizontal collecting cylinder, and an annular sealing ring is provided in the middle of the loading and unloading opening. A unit storage cylinder is nested and slidably arranged inside the horizontal collecting cylinder. The unit storage cylinder and the annular sealing ring are dimensionally matched. A connecting opening is provided in the middle of the unit storage cylinder, and the connecting opening is correspondingly arranged with the collecting opening.

[0017] Furthermore, a sliding sealing plug is nested inside the horizontal collecting cylinder. The dimensions of the horizontal collecting cylinder and the sliding sealing plug are matched. A return spring is provided in the middle of the sliding sealing plug. When the unit storage cylinder is horizontally slid into the horizontal collecting cylinder along the loading and unloading opening, it pushes the sliding sealing plug to move backward synchronously to open the collecting opening. When the unit storage cylinder is horizontally slid out of the horizontal collecting cylinder along the loading and unloading opening, the return spring pushes the sliding sealing plug to move forward synchronously to close the collecting opening.

[0018] Furthermore, an inner storage cylinder is fitted inside the unit storage cylinder. Rotary joints are provided at both the front and rear ends of the inner storage cylinder. The inner storage cylinder is rotatably connected to the unit storage cylinder through the rotary joints. A storage opening is provided in the middle of the outer wall of the inner storage cylinder. The storage opening and the communication opening are configured to cooperate with each other.

[0019] Furthermore, a rotating handle is connected to the front side of the rotary joint at the front end of the inner storage cylinder. A positioning sleeve is provided in the middle of the rotating handle. An elastic positioning pin is slidably fitted inside the positioning sleeve. An unlocking lever is connected in the middle of the elastic positioning pin. Two positioning locking grooves are provided on the front end face of the unit storage cylinder. The elastic positioning pin and the positioning locking groove are sized to match each other. The two positioning locking grooves are symmetrically arranged, and one of the positioning locking grooves is oriented in the same direction as the connecting opening.

[0020] The beneficial effects of this invention are as follows: As can be seen from the above description, the vacuum atomization powder grading device provided by this invention uniformly conveys metal powder to a vertical feed pipe via a feeding conveyor belt, and guides it to a horizontal guide pipe along the vertical feed pipe and the arc-shaped guide pipe. When the screening coils arranged parallel on the upper and lower sides of the horizontal guide pipe are energized, an upward magnetic field is formed, which helps the moving metal powder to counteract the gravity of movement and pass through the horizontal guide pipe to the accelerating ejection tube. Impurities in the metal powder, not affected by the magnetic field, naturally fall through the screening opening, thus completing one screening operation. The metal powder entering the accelerating ejection tube is horizontally accelerated and ejected by the magnetic field of multiple screening coils. The horizontal ejection distance of metal powders with different particle sizes and weights is also different. The larger the particle size and weight of the metal powder, the shorter the horizontal ejection distance, thus completing the grading of the metal powder. The entire screening and grading process is carried out in a closed vacuum treatment chamber, which can avoid the metal powder from contacting air and oxidizing, and is beneficial to improving the production quality of metal powder. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the internal structure of the vacuum processing chamber according to an embodiment of the present invention;

[0023] Figure 2 This is a front view of an embodiment of the present invention.

[0024] Figure 3This is a schematic diagram of the internal structure of the unit grading box in the disassembled state according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the accelerating projectile tube according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the feeding conveyor belt according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the V-shaped pusher plate according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the unit grading box according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the internal structure of the unit grading box according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the unit storage cylinder according to an embodiment of the present invention;

[0031] Figure 10 This is a partial structural diagram of the inner storage cylinder according to an embodiment of the present invention.

[0032] The diagram is marked as follows:

[0033] 1. Vacuum processing box; 101. Packing tube; 102. Traction reel; 103. Sealing motor; 104. Traction cable; 105. Sealing cover plate; 2. Accelerating ejection tube; 201. Accelerating coil; 202. Arc-shaped guide tube; 203. Vertical feed tube; 204. Horizontal guide tube; 205. Screening coil; 206. Screening opening; 207. Conical guide plate; 208. Screening box; 3. Storage tank; 301. Vertical feed cylinder; 302. Spiral feed plate; 303. Feeding motor; 304. Inclined guide tube; 4. Feeding conveyor belt; 401. Vertical feed cylinder; 402. Horizontal feed cylinder; 403. Horizontal feed port; 5. V-shaped pusher plate; 501. 502. Lifting guide frame; 503. Lifting screw sleeve; 504. Adjusting screw; 505. Adjusting motor; 6. Unit grading box; 601. Fitting opening; 602. Fitting sealing ring; 603. Conical collection trough; 604. Positioning sleeve; 605. Positioning pin; 7. Horizontal collection cylinder; 701. Collection opening; 702. Loading and unloading opening; 703. Annular sealing ring; 704. Sliding sealing plug; 705. Return spring; 8. Unit storage cylinder; 801. Connecting opening; 802. Positioning locking groove; 9. Inner storage cylinder; 901. Storage opening; 902. Rotary joint; 903. Rotary handle; 904. Positioning sliding sleeve; 905. Elastic positioning pin; 906. Unlocking lever. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0035] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a grading device for vacuum atomization powder production includes a vacuum processing chamber 1, with a vertical feed pipe 203 installed inside the vacuum processing chamber 1, and further includes:

[0037] The accelerating projectile tube 2 is located below the vertical material tube 203. The front end of the accelerating projectile tube 2 is provided with an arc-shaped guide tube 202. The top end of the arc-shaped guide tube 202 is connected to the bottom end of the vertical material tube 203. Multiple accelerating coils 201 are nested on the outside of the accelerating projectile tube 2. The multiple accelerating coils 201 are evenly arranged along the horizontal center line of the accelerating projectile tube 2.

[0038] A horizontal guide tube 204 is disposed between the accelerating ejector tube 2 and the arc-shaped guide tube 202. The accelerating ejector tube 2 is connected to the bottom end of the arc-shaped guide tube 202 through the horizontal guide tube 204. Screening coils 205 are arranged parallel and symmetrically on the upper and lower sides of the horizontal guide tube 204. A screening opening 206 is provided in the middle of the bottom of the horizontal guide tube 204. A conical guide plate 207 is provided on the top surface of the screening coil 205 located on the lower side of the horizontal guide tube 204. A screening box 208 is provided at the bottom of the vacuum treatment box 1.

[0039] The feeding conveyor belt 4 is positioned above the vertical feeding pipe 203. The rear end of the feeding conveyor belt 4 is located directly above the top opening of the vertical feeding pipe 203. A horizontal feeding cylinder 402 is positioned above the feeding conveyor belt 4. A horizontal feeding port 403 is opened at the bottom end of the horizontal feeding cylinder 402. A V-shaped pusher plate 5 is positioned on the rear side of the horizontal feeding cylinder 402. The V-shaped pusher plate 5 is parallel to the top surface of the feeding conveyor belt 4 and has a gap between them.

[0040] Unit grading boxes 6 are located at the rear of vacuum treatment box 1. Multiple unit grading boxes 6 are evenly arranged end to end along the center line of vacuum treatment box 1. A conical collection trough 603 is provided at the bottom of unit grading box 6.

[0041] In this embodiment, the device conveys metal powder via a feeding conveyor belt 4. The metal powder in the horizontal feeding cylinder 402 falls naturally onto the surface of the feeding conveyor belt 4 through the horizontal feeding cylinder 402 and the horizontal feeding port 403. The feeding conveyor belt 4 moves horizontally, causing the metal powder on it to pass through a V-shaped pusher plate 5. The V-shaped pusher plate 5 and the top surface of the feeding conveyor belt 4 are parallel to each other and have a gap. Therefore, the metal powder can be smoothed into a uniform layer by the V-shaped pusher plate 5. Then, the metal powder continues to be evenly conveyed to the vertical feed pipe 203 by the feeding conveyor belt 4. The thin layer of metal powder is then spread along... The vertical feed pipe 203 and the arc-shaped feed pipe 202 guide and convey the material to the horizontal guide pipe 204, where it moves horizontally and flies out at a certain speed. The screening coils 205, which are arranged parallel to each other on the upper and lower sides of the horizontal guide pipe 204, can form an upward magnetic field when energized. This helps the moving metal powder to counteract the gravity of the movement and pass through the horizontal guide pipe 204 to the accelerating ejector tube 2. Impurities in the metal powder, not affected by the magnetic field, naturally fall through the screening opening 206, thus completing one screening operation. The metal powder entering the accelerating ejector tube 2 is horizontally accelerated and ejected by the magnetic field of multiple screening coils 205.

[0042] According to Ampere's force formula, the force exerted by the electromagnetic coil on the object can be calculated as follows:

[0043]

[0044] Where F is the Ampere force, N1 and N2 are the number of turns of the electromagnetic coil and the object, I1 and I2 are the currents of the electromagnetic coil and the object, M is the mutual inductance coefficient of the electromagnetic coil and the object, and x is the position of the object relative to the electromagnetic coil.

[0045] According to Newton's second law, the acceleration of the object can be calculated as follows:

[0046]

[0047] Where a is acceleration and m is the mass of the object;

[0048] As can be seen from the above formula, if the size, number of turns, current, and mutual inductance of the electromagnetic coil remain constant, then the acceleration of an object is inversely proportional to its mass. That is, the smaller the mass, the greater the acceleration; the greater the mass, the smaller the acceleration.

[0049] According to kinematic formulas, the relationship between the displacement, initial velocity, final velocity, and time of an object moving within an electromagnetic coil can be calculated:

[0050] v = v0 + at

[0051]

[0052] Where v is the final velocity, v0 is the initial velocity, s is the displacement, and t is the time;

[0053] As can be seen from the above formula, after moving a certain distance within an electromagnetic coil of the same size, i.e., s is fixed, if the initial velocity of the object is the same, i.e. v0 is fixed, then the final velocity is directly proportional to the acceleration. That is to say, the greater the acceleration, the faster the final velocity; the smaller the acceleration, the slower the final velocity.

[0054] In summary, when an object is accelerated and launched within an electromagnetic coil of the same size, if other conditions remain unchanged (such as current, number of turns, mutual inductance, displacement, initial velocity, etc.), then the smaller the mass of the object, the greater the acceleration and the faster the final velocity; the larger the mass of the object, the smaller the acceleration and the slower the final velocity.

[0055] According to kinematic formulas, the relationship between the displacement, final velocity, and time of an object during horizontal projectile launch can be calculated:

[0056] x = vt

[0057] Where x is the distance in the horizontal projectile direction, t is the time, and v is the initial velocity in the horizontal projectile direction, we can conclude that the smaller the mass of the object, the greater the acceleration, the faster the final velocity, and the greater the displacement distance in the horizontal projectile direction; the greater the mass of the object, the smaller the acceleration, the slower the final velocity, and the smaller the displacement distance in the horizontal projectile direction.

[0058] Therefore, the horizontal throwing distance of metal powders with different particle sizes and weights is also different. The horizontal throwing distance of metal powders with larger particle sizes and weights is smaller, while the horizontal throwing distance of metal powders with larger particle sizes and weights is larger. Thus, the metal powders with different particle sizes and weights, which are accelerated by the magnetic field, naturally fall into the conical collection trough 603 of the corresponding unit classification box 6 to complete the classification of metal powders. The entire screening and classification process is carried out in a closed vacuum treatment box 1, which can avoid the metal powders from contacting the air and oxidizing, and is conducive to improving the production quality of metal powders.

[0059] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, preferably, the device stores the metal powder to be processed through a storage trough 3 located below the feeding conveyor belt 4. Vertical feed cylinders 301 are symmetrically arranged on the left and right sides of the feeding conveyor belt 4. A spiral feeding plate 302 is rotatably fitted inside the vertical feed cylinder 301, and a feeding motor 303 is connected to the outer end of the spiral feeding plate 302. The lower opening of the vertical feed cylinder 301 is located at the bottom of the storage trough 3, so the metal powder in the storage trough 3 can naturally flow into the vertical feed cylinder 301 and be fed by the feeding motor 303. 3. The drive screw feeder 302 rotates to convey metal powder upward along the vertical feed cylinder 301. The vertical feed cylinder 401 is connected above the horizontal feed cylinder 402. An inclined guide pipe 304 is provided between the top of the vertical feed cylinder 401 and the top of the vertical feed cylinder 301. The vertical feed cylinder 401 and the vertical feed cylinder 301 are connected to each other through the inclined guide pipe 304. The metal powder is then conveyed to the vertical feed cylinder 401 through the inclined guide pipe 304 and further conveyed to the horizontal feed cylinder 402 for feeding.

[0060] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, preferably, the device uses a V-shaped pusher plate 5 to spread the metal powder into a uniform layer. The V-shaped pusher plate 5 has a V-shaped structure, which facilitates pushing excess metal powder to both sides and allowing it to fall naturally into the storage tank 3 for circulating feeding. Lifting guide frames 501 are symmetrically arranged on the left and right sides of the V-shaped pusher plate 5, and the V-shaped pusher plate 5 and the lifting guide frames 501 are slidably connected. The lifting guide frames 501 and the feeding conveyor belt 4 are perpendicular to each other. Lifting screw sleeves 502 are provided at both ends of the V-shaped pusher plate 5, and an adjusting screw 503 is provided in the middle of the lifting guide frame 501. An adjusting motor 504 is connected to the shaft end of the adjusting screw 503. Therefore, the adjusting motor 504 can drive the V-shaped pusher plate 5 to move up and down through the adjusting screw 503 and the lifting screw sleeves 502, so as to adjust the distance between the V-shaped pusher plate 5 and the feeding conveyor belt 4. The feed rate is adjustable according to requirements, making it more flexible and convenient to use. The feeding conveyor belt 4 evenly transports the metal powder to the vertical feed pipe 203, and further guides it along the vertical feed pipe 203 and the arc-shaped guide pipe 202 to the horizontal guide pipe 204 and the accelerating ejection pipe 2. The width of the horizontal feed port 403 is the same as the width of the feeding conveyor belt 4, and the width of the feeding conveyor belt 4 is the same as the width of the vertical feed pipe 203. The widths of the vertical feed pipe 203, the arc-shaped guide pipe 202, the horizontal guide pipe 204, and the accelerating ejection pipe 2 are all the same. The vertical feed pipe 203 and the accelerating ejection pipe 2 are set perpendicular to each other so that the metal powder can be evenly transported and ejected. This avoids a large amount of metal powder entering the pipe at the same time, causing blockage or collisions during acceleration, which would affect the classification. This helps to improve the overall reliability and classification accuracy of the device.

[0061] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, preferably, the device accelerates and propels metal powder using a magnetic field, causing metal powders of different particle sizes and weights to fall naturally into the conical collection troughs 603 of the corresponding unit grading boxes 6, thereby completing the grading of the metal powder. The multiple unit grading boxes 6 have a detachable structure. The rear end of the vacuum treatment box 1 and both ends of the unit grading boxes 6 are provided with fitting openings 601. A fitting sealing ring 602 is arranged around the middle of the fitting opening 601. The vacuum treatment box 1 and the unit grading boxes 6 are connected and sealed to each other through the fitting openings 601 and the fitting sealing rings 602. The outer sides of the fitting openings 601 at both ends of the vacuum treatment box 1 are respectively provided with positioning sleeves 604 and positioning pins 605. The positioning sleeves 604 and positioning pins 605 are arranged correspondingly to each other and their dimensions are matched, so as to facilitate the assembly and installation of the corresponding number of unit grading boxes 6 according to the needs, making it more convenient and faster to use.

[0062] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, preferably, a plurality of traction shafts 102 are arranged around the outer side of the vacuum processing chamber 1 of the device. The traction shafts 102 are rotatably connected to the vacuum processing chamber 1. A sealed motor 103 is connected to the shaft end of the traction shaft 102. The sealed motor 103 is fixedly connected to the vacuum processing chamber 1. A traction steel cable 104 is wound around the outer side of the traction shaft 102. A sealing cover plate 105 is fixedly connected to the outer end of the traction steel cable 104. The sealing cover plate 105 and the fitting opening 601 are sized to match, thereby allowing the vacuum processing chamber to... After being assembled and installed with the unit grading box 6, the sealing cover 105 can be fitted into the fitting opening 601 of the outermost unit grading box 6. The traction shaft 102 is driven to rotate by the sealing motor 103 to wind up the traction cable 104. The traction cable 104 then drives the sealing cover 105 to tighten, so that the sealing cover 105 presses against all the unit grading boxes 6, making it easier for the whole device to form a closed environment. This makes it easier to extract the internal air to form a vacuum environment, and also makes loading, unloading and adjustment more convenient and quick.

[0063] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9As shown, preferably, the device collects the graded metal powder through the conical collecting trough 603 of the unit grading box 6. A horizontal collecting cylinder 7 is provided at the lower end of the conical collecting trough 603, and a collecting opening 701 is provided at the top of the horizontal collecting cylinder 7. The interior of the horizontal collecting cylinder 7 is connected to the interior of the conical collecting trough 603 through the collecting opening 701. A loading / unloading opening 702 is provided at the front end of the horizontal collecting cylinder 7, and an annular sealing ring 703 is provided in the middle of the loading / unloading opening 702. A unit storage cylinder 8 is nested and slidably arranged inside the horizontal collecting cylinder 7. The unit storage cylinder 8 and the annular sealing ring 703 are dimensionally matched. A connecting opening 801 is provided in the middle of the unit storage cylinder 8, and the connecting opening 801 corresponds to the collecting opening 701. Therefore, the metal powder falling into the conical collecting trough 603 can naturally fall into the unit storage cylinder 8 through the connecting opening 801 and the collecting opening 701. The unit storage cylinder 8 can be horizontally slid in and out, facilitating the collection and extraction of the corresponding metal powder as needed, making it more convenient and faster to use. Furthermore, a sliding sealing plug 704 is nested inside the horizontal collecting cylinder 7. The dimensions of the horizontal collecting cylinder 7 and the sliding sealing plug 704 are matched. A return spring 705 is connected in the middle of the sliding sealing plug 704. When the unit storage cylinder 8 is horizontally slid into the horizontal collecting cylinder 7 along the loading / unloading opening 702, it pushes the sliding sealing plug 704 backward to open the collecting opening 701. When the unit storage cylinder 8 is horizontally slid out of the horizontal collecting cylinder 7 along the loading / unloading opening 702, the return spring 705 pushes the sliding sealing plug 704 forward to close the collecting opening 701. This ensures that the unit storage cylinder 8 maintains the overall sealing of the device before and after installation, preventing air from entering the oxide metal powder and improving the quality of metal powder production.

[0064] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, preferably, the device collects and stores graded metal powder through a detachable unit storage cylinder 8. An inner storage cylinder 9 is fitted inside the unit storage cylinder 8. Rotary joints 902 are provided at both ends of the inner storage cylinder 9, which is rotatably connected to the unit storage cylinder 8 via the rotary joints 902. A storage opening 901 is provided in the middle of the outer wall of the inner storage cylinder 9. The storage opening 901 and the connecting opening 801 are mutually fitted, allowing powder to enter the inner storage cylinder 9 for storage through the storage opening 901 and the connecting opening 801. After storage, the inner storage cylinder 9 can be rotated to simultaneously close the storage opening 901 and the connecting opening 801, facilitating the removal of the unit storage cylinder 8 for transfer and transportation of the metal powder. This also ensures that the metal powder remains airtight, which is beneficial for improving the quality of metal powder production. The rotary joint 902 at the front end of the inner storage cylinder 9... A rotating handle 903 is provided on the side connection, which facilitates the rotation of the inner storage cylinder 9 and the moving unit storage cylinder 8. A positioning sleeve 904 is provided in the middle of the rotating handle 903. An elastic positioning pin 905 is slidably fitted inside the positioning sleeve 904. An unlocking lever 906 is provided in the middle of the elastic positioning pin 905. Two positioning locking grooves 802 are provided on the front end face of the unit storage cylinder 8. The elastic positioning pin 905 and the positioning locking groove 802 are sized to match each other. The two positioning locking grooves 802 are symmetrically arranged. One of the positioning locking grooves 802 is oriented in the same direction as the connecting opening 801. Thus, by inserting the elastic positioning pin 905 into the positioning locking groove 802, it is easy to rotate, lock and position the inner storage cylinder 9, maintain the overall sealing, and prevent the inner storage cylinder 9 from rotating and opening the storage opening 901 and the connecting opening 801 during movement, making it more reliable and convenient to use.

[0065] In use, firstly, the required number of unit grading boxes 6 are stacked and installed on the vacuum treatment chamber 1 according to the needs. Then, the sealing cover 105 is fitted into the fitting opening 601 of the outermost unit grading box 6. The sealing motor 103 drives the traction shaft 102 to rotate and wind up the traction cable 104. In turn, the traction cable 104 drives the sealing cover 105 to tighten, so that the sealing cover 105 presses against all the unit grading boxes 6, making the whole device form a closed environment. Then, the internal air is extracted through the packing tube 101 arranged on the side wall of the vacuum treatment chamber 1 to form a vacuum environment. The metal powder to be processed is filled into the storage tank 3. Then, the feeding motor 303 drives the spiral feeding plate 302 to rotate and feed the metal powder vertically upwards into the feeding cylinder 3. 01. The metal powder is conveyed upwards, then through the inclined guide pipe 304 to the vertical feed cylinder 401, and further conveyed to the horizontal feed cylinder 402. The metal powder in the horizontal feed cylinder 402 falls naturally onto the surface of the feeding conveyor belt 4 through the horizontal feed cylinder 402 and the horizontal feed port 403. The feeding conveyor belt 4 moves horizontally, carrying the metal powder on it past the V-shaped pusher plate 5. The V-shaped pusher plate 5 can smooth the metal powder into a uniform layer. Then, the metal powder continues to be evenly conveyed by the feeding conveyor belt 4 to the vertical feed pipe 203. The thin layer of metal powder is guided along the vertical feed pipe 203 and the arc-shaped guide pipe 202 to the horizontal guide pipe 204, where it flies out at a certain speed, landing on the upper and lower sides of the horizontal guide pipe 204. When the parallel screening coils 205 are energized, they form an upward magnetic field. The translating metal powder, counteracting gravity, is translating through the horizontal guide tube 204 to the accelerating ejection tube 2. Impurities in the metal powder, unaffected by the magnetic field, naturally fall through the screening opening 206, thus completing one screening operation. The metal powder entering the accelerating ejection tube 2 is horizontally accelerated and ejected by the magnetic fields of the multiple screening coils 205. The horizontal ejection distance varies depending on the particle size and weight of the metal powder; larger particle sizes result in shorter horizontal ejection distances, while larger particle sizes result in longer horizontal ejection distances. Thus, the metal powders of different particle sizes, accelerated and ejected by the magnetic field, naturally fall into the conical collection trough 603 of the corresponding unit grading box 6, completing the metal powder sorting process. The metal powder is classified, and the metal powder falling into the conical collection trough 603 can naturally fall into the unit storage cylinder 8 through the connecting opening 801 and the collection opening 701, and enter the inner storage cylinder 9 for storage through the storage opening 901 and the connecting opening 801. After storage is completed, the elastic positioning pin 905 is pulled out of the positioning locking groove 802 on the side of the connecting opening 801 by the unlocking lever 906 to unlock it. Then, the inner storage cylinder 9 is rotated half a turn by rotating the handle 903, and the elastic positioning pin 905 is inserted into another positioning locking groove 802 to lock it. Then, the unit storage cylinder 8 can be pulled out as a whole, and another unit storage cylinder 8 can be installed. Then, the inner storage cylinder 9 is unlocked and rotated half a turn and locked again, thus completing the metal powder classification and material handling work.

[0066] The vacuum atomization powder grading device provided by this invention uniformly conveys metal powder to a vertical feed pipe 203 via a feeding conveyor belt 4, and guides it along the vertical feed pipe 203 and the arc-shaped guide pipe 202 to a horizontal guide pipe 204. When the screening coils 205, which are arranged parallel to each other on the upper and lower sides of the horizontal guide pipe 204, are energized, an upward magnetic field is formed. This allows the moving metal powder to overcome gravity and pass through the horizontal guide pipe 204 to the accelerating ejection tube 2. Impurities in the metal powder, not affected by the magnetic field, naturally fall through the screening opening 206, thus completing one screening operation. The metal powder entering the accelerating ejection tube 2 is horizontally accelerated and ejected by the magnetic field of multiple screening coils 205. The horizontal ejection distance varies depending on the particle size and weight of the metal powder; the larger the particle size and weight, the shorter the horizontal ejection distance. This completes the grading of the metal powder. The entire grading process is carried out in a closed vacuum treatment chamber 1, which avoids oxidation of the metal powder due to contact with air, thus improving the quality of metal powder production.

[0067] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0068] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A grading device for vacuum atomization powder production, comprising a vacuum processing chamber (1), wherein a vertical feed pipe (203) is provided inside the vacuum processing chamber (1), characterized in that, Also includes: An accelerating projectile tube (2) is disposed below the vertical feed tube (203). An arc-shaped guide tube (202) is provided at the front end of the accelerating projectile tube (2). The top end of the arc-shaped guide tube (202) is connected to the bottom end of the vertical feed tube (203). Multiple accelerating coils (201) are nested on the outside of the accelerating projectile tube (2). The multiple accelerating coils (201) are evenly arranged along the horizontal center line of the accelerating projectile tube (2). A horizontal guide tube (204) is disposed between the accelerating ejector tube (2) and the arc-shaped guide tube (202). The accelerating ejector tube (2) is connected to the bottom end of the arc-shaped guide tube (202) through the horizontal guide tube (204). Screening coils (205) are arranged parallel and symmetrically on the upper and lower sides of the horizontal guide tube (204). A screening opening (206) is provided in the middle of the bottom of the horizontal guide tube (204). A conical guide plate (207) is provided on the top surface of the screening coil (205) located on the lower side of the horizontal guide tube (204). A screening box (208) is provided at the bottom of the vacuum treatment box (1). A feeding conveyor belt (4) is set above the vertical feeding pipe (203). The rear end of the feeding conveyor belt (4) is located directly above the top opening of the vertical feeding pipe (203). A horizontal feeding cylinder (402) is set above the feeding conveyor belt (4). A horizontal feeding port (403) is opened at the bottom end of the horizontal feeding cylinder (402). A V-shaped pusher plate (5) is set on the rear side of the horizontal feeding cylinder (402). The V-shaped pusher plate (5) and the top surface of the feeding conveyor belt (4) are arranged parallel to each other and have a gap. Unit grading box (6) is set on the rear side of the vacuum treatment box (1). Multiple unit grading boxes (6) are evenly arranged end to end along the center line of the vacuum treatment box (1). A conical collection trough (603) is provided at the bottom of the unit grading box (6). A storage tank (3) is provided below the feeding conveyor belt (4). Vertical feed cylinders (301) are symmetrically arranged on the left and right sides of the feeding conveyor belt (4). The lower opening of the vertical feed cylinder (301) is located at the bottom of the storage tank (3). A spiral feeding plate (302) is fitted and rotated inside the vertical feed cylinder (301). A feeding motor (303) is connected to the outer end of the spiral feeding plate (302). A vertical feed cylinder (401) is connected above the horizontal feed cylinder (402). An inclined guide pipe (304) is provided between the top end of the vertical feed cylinder (401) and the top end of the vertical feed cylinder (301). The vertical feed cylinder (401) and the vertical feed cylinder (301) are interconnected through the inclined guide pipe (304). The width of the horizontal feed port (403) is the same as the width of the feeding conveyor belt (4), the width of the feeding conveyor belt (4) is the same as the width of the vertical feed pipe (203), the width of the vertical feed pipe (203), the arc-shaped guide pipe (202), the horizontal guide pipe (204) and the accelerating projectile pipe (2) are all the same, and the vertical feed pipe (203) and the accelerating projectile pipe (2) are arranged perpendicular to each other; The V-shaped pusher plate (5) is symmetrically provided with lifting guide frames (501) on the left and right sides. The V-shaped pusher plate (5) is slidably connected to the lifting guide frame (501). The lifting guide frame (501) and the feeding conveyor belt (4) are perpendicular to each other. The left and right ends of the V-shaped pusher plate (5) are provided with lifting screw sleeves (502). The middle of the lifting guide frame (501) is provided with an adjusting screw (503). The shaft end of the adjusting screw (503) is connected to an adjusting motor (504).

2. The grading device for vacuum atomization powder production according to claim 1, characterized in that, The rear end of the vacuum treatment box (1) and both ends of the unit grading box (6) are provided with fitting openings (601). A fitting sealing ring (602) is provided around the middle of the fitting opening (601). The vacuum treatment box (1) and the unit grading box (6) are connected to each other by fitting openings (601) and fitting sealing rings (602). A positioning sleeve (604) and a positioning pin (605) are respectively provided on the outer side of the fitting openings (601) provided at both ends of the vacuum treatment box (1). The positioning sleeve (604) and the positioning pin (605) are provided corresponding to each other and their sizes are matched.

3. The grading device for vacuum atomization powder production according to claim 1, characterized in that, Multiple traction reels (102) are arranged around the outer side of the vacuum treatment box (1). The traction reels (102) are rotatably connected to the vacuum treatment box (1). A sealed motor (103) is connected to the shaft end of the traction reel (102). The sealed motor (103) is fixedly connected to the vacuum treatment box (1). A traction steel cable (104) is wound around the outer side of the traction reel (102). A closed cover plate (105) is fixedly connected to the outer end of the traction steel cable (104). The size of the closed cover plate (105) matches the size of the fitting opening (601).

4. The grading device for vacuum atomization powder production according to claim 1, characterized in that, A horizontal collecting cylinder (7) is provided at the lower end of the conical collecting trough (603). A collecting opening (701) is provided at the top of the horizontal collecting cylinder (7). The interior of the horizontal collecting cylinder (7) is connected to the interior of the conical collecting trough (603) through the collecting opening (701). A loading and unloading opening (702) is provided at the front end of the horizontal collecting cylinder (7). An annular sealing ring (703) is provided in the middle of the loading and unloading opening (702). A unit storage cylinder (8) is nested and slidably provided inside the horizontal collecting cylinder (7). The unit storage cylinder (8) and the annular sealing ring (703) are sized to match each other. A connecting opening (801) is provided in the middle of the unit storage cylinder (8). The connecting opening (801) and the collecting opening (701) are correspondingly arranged.

5. The grading device for vacuum atomization powder production according to claim 4, characterized in that, A sliding sealing plug (704) is nested inside the horizontal collecting cylinder (7). The dimensions of the horizontal collecting cylinder (7) and the sliding sealing plug (704) are matched. A return spring (705) is provided in the middle of the sliding sealing plug (704). When the unit storage cylinder (8) slides horizontally into the horizontal collecting cylinder (7) along the loading and unloading opening (702), it pushes the sliding sealing plug (704) to move backward synchronously to open the collecting opening (701). When the unit storage cylinder (8) slides horizontally out of the horizontal collecting cylinder (7) along the loading and unloading opening (702), the return spring (705) pushes the sliding sealing plug (704) to move forward synchronously to close the collecting opening (701).

6. The grading device for vacuum atomization powder production according to claim 5, characterized in that, An inner storage cylinder (9) is fitted inside the unit storage cylinder (8). Rotary joints (902) are provided at both the front and rear ends of the inner storage cylinder (9). The inner storage cylinder (9) is rotatably connected to the unit storage cylinder (8) through the rotary joints (902). A storage opening (901) is provided in the middle of the outer wall of the inner storage cylinder (9). The storage opening (901) and the connecting opening (801) are configured to cooperate with each other.

7. The grading device for vacuum atomization powder production according to claim 6, characterized in that, A rotating handle (903) is connected to the front side of the rotating joint (902) at the front end of the inner storage cylinder (9). A positioning sleeve (904) is provided in the middle of the rotating handle (903). An elastic positioning pin (905) is fitted and slidably provided on the inner side of the positioning sleeve (904). An unlocking lever (906) is connected in the middle of the elastic positioning pin (905). Two positioning locking grooves (802) are provided on the front end face of the unit storage cylinder (8). The elastic positioning pin (905) and the positioning locking groove (802) are sized to match each other. The two positioning locking grooves (802) are symmetrically arranged. One of the positioning locking grooves (802) is in the same orientation as the connecting opening (801).

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