A nano- and micron powder feeder

Abstract

The present invention discloses a nano- and micron powder feeder, comprising a powder bucket, a powder bucket cover and a powder bucket bottom plate, wherein the powder bucket cover and the powder bucket bottom plate are detachably mounted on the upper and lower ends of the powder bucket respectively by a plurality of assembly bolts, and two fixing clips are axially arranged on the side wall of the powder bucket; two through holes are provided on the powder bucket cover plate, one of which is externally threadedly connected to an air inlet interface; the other through hole is externally threadedly connected to a powder outlet joint, and the other end of the powder outlet pipe is connected to a plasma spray gun, thereby quantitatively conveying powder to the ion spray gun; a first oscillator is vertically mounted on the side wall of the powder bucket, and a second oscillator is coaxially mounted on the lower end surface of the powder bucket bottom plate; a spiral air supply unit is also provided on the powder bucket bottom plate, and a gas inlet is provided on the side wall of the powder bucket bottom plate, and the gas inlet is connected to the spiral air supply unit for conveying dry gas to the spiral air supply unit.

Description

Technical Field

[0001] The invention belongs to the technical field of powder metallurgy, in particular to a nano- and micron-powder feeder. Background Art

[0002] A powder feeder is used to supply powder material to a plasma spraying device. Conventional powder feeder structures, such as those disclosed in the invention patent with publication number CN117888054A, utilize metering holes circumferentially formed on a metering disk, which are connected to a powder outlet channel during rotation. This allows the air pressure output by the jet mechanism to eject the powder in the metering holes into a powder outlet pipe. While this design achieves quantitative powder delivery, the powder suffers from poor fluidity and dispersibility in actual use, particularly for nano- and micron-sized powders, which have strong adsorption capabilities and are prone to agglomeration, resulting in powder blockage and uneven powder discharge.

[0003] Therefore, it is necessary to provide a nano- and micron-powder feeder to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a nano- and micron-sized powder feeder, comprising a powder hopper, a powder hopper cover, and a powder hopper bottom plate, wherein the powder hopper cover and the powder hopper bottom plate are detachably mounted on the upper and lower ends of the powder hopper, respectively, by a plurality of assembly bolts, thereby forming a sealed powder storage space within the powder hopper, and two fixing buckles are axially arranged on the side wall of the powder hopper;

[0005] The upper end surface of the powder barrel cover is provided with a feed port for feeding powder into the powder barrel, and a sealing cover is provided outside the feed port;

[0006] The powder barrel cover is provided with two through holes, one of which is externally threadedly connected to an air inlet interface, to which an air pipe is externally connected; the other through hole is externally threadedly connected to a powder outlet connector, to which a powder outlet pipe is externally connected, and the other end of the powder outlet pipe is connected to the plasma spray gun, thereby quantitatively conveying powder to the ion spray gun;

[0007] A first oscillator is vertically mounted on the side wall of the powder barrel, and a second oscillator is coaxially mounted on the lower end surface of the powder barrel bottom plate;

[0008] A spiral air supply unit is also provided on the bottom plate of the powder hopper. The spiral air supply unit uses multiple conductive tubes to extend into the powder hopper from the bottom of the powder hopper. The spiral air supply unit cooperates with the second oscillator to ultrasonically oscillate the powder in the powder hopper. A gas inlet is provided on the side wall of the bottom plate of the powder hopper. The gas inlet is connected to the spiral air supply unit and is used to supply dry gas to the spiral air supply unit. The spiral air supply unit disperses the dry gas into the powder hopper through each conductive tube, so that the powder in the powder hopper flows in a spiral direction, so that the powder flows and disperses to form an aerosol, which is then quickly discharged through the powder outlet joint along with the airflow in the air inlet interface.

[0009] Furthermore, preferably, the powder barrel and the powder barrel bottom plate are both provided with oscillator fixing bolts, the first oscillator and the second oscillator are respectively connected to the oscillator fixing bolts, and the first oscillator and the second oscillator are provided with power interfaces.

[0010] Furthermore, as a preference, a gas flow sleeve is installed on the powder barrel cover directly below the air inlet interface, and a plurality of flow holes are opened at the bottom of the gas flow sleeve;

[0011] A discharge head is installed on the powder barrel cover just below the powder discharge joint, and a plurality of powder holes are opened on the circumferential side wall of the discharge head.

[0012] Furthermore, preferably, the spiral air supply unit includes:

[0013] The conductive tubes are arranged circumferentially, each having a threaded groove on its lower side wall, and the powder barrel bottom plate has a plurality of corresponding threaded holes, and the conductive tubes are threadedly connected to the threaded holes;

[0014] The inner tank is provided in the middle of the upper end surface of the powder barrel bottom plate, and the gas inlet is connected to the side wall of the inner tank;

[0015] A fixed plate is sealed and assembled with the inner tank, and each of the conductive tubes is vertically passed through and fixed on the fixed plate;

[0016] The air guide holes are provided on the side wall of the conducting tube near the thread groove. The dry gas in the gas inlet enters the inner groove and is dispersed into the conducting tube through the air guide holes.

[0017] Furthermore, preferably, a straight slot is provided on the side wall of the conductive tube above the air guide hole, and an inner tube is coaxially connected to the conductive tube, and a plurality of side holes are distributed on the wall of the inner tube, and each of the side holes is spirally distributed along the axial direction of the inner tube;

[0018] The inner tube is also provided with a plurality of micro-holes distributed in a spiral pattern in the same direction;

[0019] The straight slots of each conductive tube are oriented in a tangential direction of the circumferential distribution thereof.

[0020] Furthermore, preferably, the diameter of the microholes is not larger than the diameter of the side holes, and when the inner tube is in the absence of external force, each of the microholes and the side holes is staggered with the straight slot.

[0021] Furthermore, preferably, a shaft sleeve is slidably connected to the interior of the lower end of the conductive tube, the lower end of the shaft sleeve is configured as a conical structure, and the inner wall of the conductive tube is provided with a broken notch, the lower end of the shaft sleeve is slidably and sealingly matched with the broken notch, and a plurality of connecting holes are provided on the side wall of the shaft sleeve;

[0022] An inner spring is connected between the shaft sleeve and the conducting tube, and the shaft sleeve is in sealing contact with the broken notch due to the elastic force of the inner spring;

[0023] A connecting sleeve is rotatably connected in the conductive tube, one end of the connecting sleeve is fixed to the inner tube, one end of the shaft sleeve is slidably connected to the connecting sleeve, an axle pin is fixed on the side wall of the shaft sleeve, and a spiral groove is opened on the inner wall of the connecting sleeve, and the axle pin slides along the spiral groove.

[0024] Furthermore, preferably, the sleeve slides upward along the axial direction of the conductive tube under the push of the dry gas flow. At this time, the inner tube rotates synchronously with the connecting sleeve, so that the side holes are connected with the straight slots one by one in a bottom-up order. At this time, the microholes on the same vertical line are also gradually connected with the straight slots in a bottom-up order, and the dry gas enters the powder barrel through the corresponding side holes and microholes.

[0025] Furthermore, preferably, the spiral air supply unit controls the pressure of the drying gas according to the powder stock in the powder barrel, so that one of the side holes on the inner tube and the microholes on the same straight line are respectively located inside and above the powder stock.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The first and second oscillators used in the present invention can provide ultrasonic vibration in the horizontal and vertical directions of the powder bucket, thereby fully dispersing the powder in the powder bucket;

[0028] The spiral air supply unit mainly used in the present invention can have multiple conduction tubes to spirally supply air to the powder barrel, so that a spiral upward airflow is formed in the powder barrel, so that the powder can quickly form an aerosol, thereby improving the fluidity and uniformity of the powder output. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is an exploded view of the structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the powder barrel bottom plate of the present invention;

[0032] Figure 4 This is a half-section view of the structure of the powder barrel bottom plate of the present invention;

[0033] Figure 5 Schematic diagram of the structure of the spiral air supply unit in the present invention;

[0034] Figure 6 Schematic diagram of the structure of the conduction tube in the present invention;

[0035] Figure 7 Schematic diagram of the structure of the inner tube in the present invention;

[0036] Figure 8 A partial structural cross-sectional view of the conductive tube of the present invention;

[0037] Figure 9 Schematic diagram of the structure of the connecting sleeve in the present invention;

[0038] Figure 10 This is a schematic diagram of spiral air supply when the spiral air supply unit of the present invention is working;

[0039] In the figure: 1. Powder barrel; 11. Fixing buckle; 12. First oscillator; 13. Second oscillator; 14. Oscillator fixing bolt; 2. Powder barrel cover; 21. Sealing cover; 22. Air inlet interface; 23. Powder outlet connector; 24. Gas flow sleeve; 25. Discharge head; 3. Powder barrel bottom plate; 31. Gas inlet; 32. Threaded hole; 33. Inner groove; 34. Fixing plate; 4. Spiral air supply unit; 41. Conducting tube; 42. Air guide hole; 43. Straight slot; 44. Inner tube; 45. Side hole; 46. Micropore; 5. Bushing; 51. Connecting hole; 52. Inner spring; 53. Connecting sleeve; 54. Axle pin; 55. Spiral groove. DETAILED DESCRIPTION

[0040] See also Figures 1-10 In an embodiment of the present invention, a nano- and micron-sized powder feeder includes a powder hopper 1, a powder hopper cover 2, and a powder hopper bottom 3. The powder hopper cover 2 and the powder hopper bottom 3 are detachably mounted on the upper and lower ends of the powder hopper 1 by a plurality of assembly bolts, respectively, so that a sealed powder storage space is formed in the powder hopper 1. Two fixing buckles 11 are axially arranged on the side wall of the powder hopper 1.

[0041] The upper end surface of the powder barrel cover 2 is provided with a feed port for feeding powder into the powder barrel 1 , and a sealing cover 21 is mounted outside the feed port;

[0042] The powder barrel cover 2 has two through holes, one of which is externally threadedly connected to an air inlet interface 22, to which an air pipe is externally connected; the other through hole is externally threadedly connected to a powder outlet connector 23, to which a powder outlet pipe is externally connected, the other end of which is connected to the plasma spray gun, thereby quantitatively conveying powder to the ion spray gun;

[0043] A first vibrator 12 is vertically mounted on the side wall of the powder hopper 1, and a second vibrator 13 is coaxially mounted on the lower end surface of the powder hopper bottom plate 3. The first vibrator 12 provides horizontal ultrasonic vibrations to the powder inside the powder hopper from the side wall, while the second vibrator 13 provides vertical ultrasonic vibrations to the powder inside the powder hopper from below, thereby effectively promoting dynamic dispersion of the powder inside the powder hopper and preventing agglomeration and caking in the powder hopper.

[0044] A spiral air supply unit 4 is also provided on the powder barrel bottom plate 3. The spiral air supply unit 4 extends into the powder barrel 1 from the bottom of the powder barrel 1 using multiple conduction tubes 41. The spiral air supply unit 4 cooperates with the second oscillator 13 to ultrasonically oscillate the powder in the powder barrel 1. A gas inlet 31 is provided on the side wall of the powder barrel bottom plate 3. The gas inlet 31 is connected to the spiral air supply unit 4 and is used to supply dry gas to the spiral air supply unit 4. The spiral air supply unit 4 disperses the dry gas into the powder barrel 1 through each conduction tube 41, so that the powder in the powder barrel 1 flows in a spiral flow, so that the powder flows and disperses to form an aerosol. In this state, the powder particles have high dispersion and fluidity, avoid agglomeration, and are quickly discharged through the powder outlet joint 23 with the airflow in the air inlet interface 22.

[0045] In this embodiment, the powder barrel 1 and the powder barrel bottom plate 3 are both provided with an oscillator fixing bolt 14, and the first oscillator 12 and the second oscillator 13 are respectively connected to the oscillator fixing bolts 14, and the first oscillator 12 and the second oscillator 13 are provided with a power interface.

[0046] As a preferred embodiment, a gas flow sleeve 24 is installed on the powder barrel cover 2 just below the air inlet port 22, and a plurality of flow holes are opened at the bottom of the gas flow sleeve 24;

[0047] A discharge head 25 is installed on the powder barrel cover 2 just below the powder discharge joint 23 . A plurality of powder holes are opened on the circumferential side wall of the discharge head 25 so that powder can be discharged quickly through the powder holes.

[0048] In this embodiment, the spiral air supply unit 4 includes:

[0049] The circumferentially arranged transmission tubes 41 each have a threaded groove formed on the sidewall of their lower ends. The powder hopper bottom plate 3 has a plurality of corresponding threaded holes 32 formed therein, and the transmission tubes 41 are threadedly connected to the threaded holes 32. The transmission tubes 41 are mounted on the powder hopper bottom plate 3 and can cooperate with the second oscillator 13 to provide acoustic wave transmission to the powder in the powder hopper during operation of the powder feeder.

[0050] The inner groove 33 is provided in the middle of the upper end surface of the powder barrel bottom plate 3, and the gas inlet 31 is connected to the side wall of the inner groove 33;

[0051] The fixed plate 34 is sealed and assembled with the inner groove 33, and each of the conductive tubes 41 is vertically connected and fixed on the fixed plate 34;

[0052] The air guide holes 42 are provided on the side wall of the conductive tube 41 near the thread groove. The dry gas in the gas inlet 31 enters the inner groove 33 and is dispersed into the conductive tube 41 through the air guide holes 42 . The dry gas can further ensure the dryness of the powder.

[0053] In this embodiment, a straight slot 43 is formed on the side wall of the conductive tube 41 above the air guide hole 42, and an inner tube 44 is coaxially connected to the conductive tube 41. The inner tube 44 has a plurality of side holes 45 distributed on the wall thereof, and the side holes 45 are spirally distributed along the axial direction of the inner tube 44.

[0054] The inner tube 44 is also provided with a plurality of micro-holes 46 distributed in a spiral pattern in the same direction;

[0055] The straight slots of each of the conductive tubes 41 are oriented in a tangential direction of the circumferential distribution thereof, so that when the conductive tubes are conveying dry gas, the dry gas can form a spiral rise in the powder barrel, further improving the fluidity of the powder in the aerosol state.

[0056] In this embodiment, the aperture of the micropores 46 is no larger than the aperture of the side holes 45, and when the inner tube 44 is not subjected to external force, each of the micropores 46 and the side holes 45 is staggered with the straight slot 43, that is, when the powder feeder is not working, each conduction tube is in a sealed state to prevent powder from leaking from the straight slot.

[0057] As a preferred embodiment, the lower end of the conductive tube 41 is slidably connected to a sleeve 5. The lower end of the sleeve 5 is configured as a tapered structure, and the inner wall of the conductive tube 41 is provided with a broken notch. The lower end of the sleeve 5 slides and seals with the broken notch. The side wall of the sleeve 5 is provided with a plurality of connecting holes 51.

[0058] An inner spring 52 is connected between the sleeve 5 and the conducting tube 41, and the sleeve 5 is in sealing contact with the broken notch due to the elastic force of the inner spring 52;

[0059] A connecting sleeve 53 is rotatably connected in the conductive tube 41, one end of the connecting sleeve 53 is fixed to the inner tube 44, and one end of the shaft sleeve 5 is slidably connected to the connecting sleeve 53. An axle pin 54 is fixed on the side wall of the shaft sleeve 5, and a spiral groove 55 is provided on the inner wall of the connecting sleeve 53. The axle pin 54 slides along the spiral groove 55, so that when the shaft sleeve 5 slides up and down, it can drive the inner tube and the connecting sleeve to rotate synchronously through the sliding action of the axle pin 54 and the spiral groove 55, so that the microholes 46 and the side holes 45 on the inner tube are connected to the straight slot 43.

[0060] In this embodiment, the sleeve 5 slides upward along the axial direction of the conductive tube 41 under the push of the dry gas flow. At this time, the inner tube 44 rotates synchronously with the connecting sleeve 53, so that the side holes 45 are connected with the straight slot 43 one by one in a bottom-up order. At this time, the micropores 46 on the same vertical line are also gradually connected with the straight slot 43 in a bottom-up order, and the dry gas enters the powder barrel 1 through the corresponding side holes 45 and micropores 46. It should be noted that when the spiral air supply unit 4 is delivering dry gas, at least one side hole 45 and micropore 46 is connected with the straight slot 43. At this time, a part of the dry gas is discharged into the powder barrel through the side holes 45, and a part of the gas is discharged into the powder barrel through the micropores 46.

[0061] In this embodiment, the spiral air supply unit 4 controls the pressure of the drying gas according to the powder inventory in the powder hopper, so that one of the side holes 45 on the inner tube 44 and the micropores 46 on the same line are respectively located inside and above the powder inventory. That is to say, the optimal working mode of the spiral air supply unit 4 is: first, the powder inventory in the powder hopper is obtained based on visual judgment or a weighing sensor, and then the spiral air supply unit 4 adjusts the pressure of the drying gas based on the powder inventory, so that the side holes on the inner tube are located at a depth of about 5 cm below the powder inventory. At this time, the drying gas can flow into the powder and carry the powder upward, while the micropores on the same line are located above the powder inventory. The remaining drying gas flows and carries the powder in the suspended circulation state in the powder hopper through the micropores, thereby ensuring the overall density and dispersion uniformity of the powder aerosol state, so that the subsequent gas enters the powder hopper through the air inlet interface and is discharged from the powder outlet joint 23 at the same time as the drying gas, avoiding powder blockage and agglomeration.

[0062] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A nano- and micron powder feeder, comprising a powder barrel (1), a powder barrel cover (2), and a powder barrel bottom plate (3), characterized in that: The powder barrel cover (2) and the powder barrel bottom plate (3) are detachably mounted on the upper and lower ends of the powder barrel (1) respectively by a plurality of assembly bolts, so that a closed powder storage space is formed in the powder barrel (1), and two fixing buckles (11) are axially arranged on the side wall of the powder barrel (1); The upper end surface of the powder barrel cover (2) is provided with a feed port for feeding powder into the powder barrel (1), and a sealing cover (21) is mounted outside the feed port; The powder barrel cover (2) is provided with two through holes, one of which is externally threadedly connected to an air inlet interface (22), and the air inlet interface (22) is externally connected to an air pipe; the other through hole is externally threadedly connected to a powder outlet connector (23), and the powder outlet connector (23) is externally connected to a powder outlet pipe, and the other end of the powder outlet pipe is connected to a plasma spray gun, thereby quantitatively conveying powder to the plasma spray gun; A first oscillator (12) is vertically mounted on the side wall of the powder barrel (1), and a second oscillator (13) is coaxially mounted on the lower end surface of the powder barrel bottom plate (3); A spiral air supply unit (4) is further provided on the powder barrel bottom plate (3). The spiral air supply unit (4) extends from the bottom of the powder barrel (1) into the powder barrel (1) using a plurality of conduction tubes (41). The spiral air supply unit (4) cooperates with the second oscillator (13) to ultrasonically oscillate the powder in the powder barrel (1). A gas inlet (31) is provided on the side wall of the powder barrel bottom plate (3). The gas inlet (31) is connected to the spiral air supply unit (4) and is used to deliver dry gas to the spiral air supply unit (4). The spiral air supply unit (4) disperses the dry gas into the powder barrel (1) through each conduction tube (41), so that the powder in the powder barrel (1) flows in a spiral manner, so that the powder flows and disperses to form an aerosol, which is then quickly discharged through the powder outlet joint (23) along with the air flow in the air inlet interface (22); The spiral air supply unit (4) comprises: The conductive tubes (41) are arranged circumferentially, and the lower side walls of the conductive tubes (41) are all provided with threaded grooves, and the powder barrel bottom plate (3) is correspondingly provided with a plurality of threaded holes (32), and the conductive tubes (41) are threadedly connected to the threaded holes (32); The inner groove (33) is provided in the middle of the upper end surface of the powder barrel bottom plate (3), and the gas inlet (31) is connected to the side wall of the inner groove (33); A fixed plate (34) is sealed and assembled with the inner groove (33), and each of the conductive tubes (41) is vertically passed through and fixed on the fixed plate (34); The air guide holes (42) are provided on the side wall of the conductive tube (41) near the thread groove. The dry gas in the gas inlet (31) enters the inner groove (33) and is dispersed into the conductive tube (41) through the air guide holes (42).

2. The nano- and micron-powder feeder according to claim 1, characterized in that: The powder barrel (1) and the powder barrel bottom plate (3) are both provided with an oscillator fixing bolt (14), the first oscillator (12) and the second oscillator (13) are respectively connected to the oscillator fixing bolts (14), and the first oscillator (12) and the second oscillator (13) are provided with power interfaces.

3. The nano- and micron-powder feeder according to claim 1, characterized in that: A gas flow sleeve (24) is installed on the powder barrel cover (2) just below the air inlet interface (22), and a plurality of flow holes are opened at the bottom of the gas flow sleeve (24); A discharge head (25) is installed on the powder barrel cover (2) just below the powder discharge joint (23), and a plurality of powder holes are opened on the circumferential side wall of the discharge head (25).

4. The nano- and micron-powder feeder according to claim 1, characterized in that: A straight slot (43) is provided on the side wall of the conductive tube (41) above the air guide hole (42), and an inner tube (44) is coaxially connected to the conductive tube (41), and a plurality of side holes (45) are distributed on the wall of the inner tube (44), and each of the side holes (45) is spirally distributed along the axial direction of the inner tube (44); The inner tube (44) is also provided with a plurality of micro-holes (46) distributed in a spiral pattern in the same direction; The straight slots of each of the conductive tubes (41) are oriented in a tangential direction of the circumferential distribution thereof.

5. The nano- and micron-powder feeder according to claim 4, characterized in that: The aperture of the microhole (46) is not larger than that of the side hole (45), and when the inner tube (44) is not subjected to external force, each of the microholes (46) and the side hole (45) is staggered with the straight slot (43).

6. The nano- and micron-powder feeder according to claim 4, characterized in that: The lower end of the conductive tube (41) is internally slidably connected to a shaft sleeve (5), the lower end of the shaft sleeve (5) is configured as a conical structure, and the inner wall of the conductive tube (41) is provided with a broken notch, the lower end of the shaft sleeve (5) is slidably and sealingly matched with the broken notch, and a plurality of connecting holes (51) are provided on the side wall of the shaft sleeve (5); An inner spring (52) is connected between the shaft sleeve (5) and the conducting tube (41), and the shaft sleeve (5) is in sealing contact with the broken notch due to the elastic force of the inner spring (52); A connecting sleeve (53) is rotatably connected in the conductive tube (41), one end of the connecting sleeve (53) is fixed to the inner tube (44), one end of the shaft sleeve (5) is slidably connected to the connecting sleeve (53), an axle pin (54) is fixed on the side wall of the shaft sleeve (5), and a spiral groove (55) is opened on the inner wall of the connecting sleeve (53), and the axle pin (54) slides along the spiral groove (55).

7. The nano- and micron-sized powder feeder according to claim 6, characterized in that: The shaft sleeve (5) slides upward along the axial direction of the conducting tube (41) under the push of the dry gas flow. At this time, the inner tube (44) rotates synchronously with the connecting sleeve (53), so that the side holes (45) are connected to the straight slots (43) one by one in a bottom-up order. At this time, the micro holes (46) on the same vertical line are also connected to the straight slots (43) in a bottom-up order. The dry gas enters the powder barrel (1) through the corresponding side holes (45) and micro holes (46).

8. The nano- and micron-sized powder feeder according to claim 6, characterized in that: The spiral air supply unit (4) controls the pressure of the drying gas according to the powder storage in the powder barrel, so that one of the side holes (45) on the inner tube (44) and the microholes (46) on the same straight line are respectively located inside and above the powder storage.

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