A powder feeding nozzle for efficient self-cleaning in the process of powder feeding type laser cladding additive manufacturing and its usage method

Abstract

A powder feeding nozzle for efficient self-cleaning in the process of powder feeding laser cladding additive manufacturing and its usage method, which relates to a powder feeding nozzle for cleaning powder blockage in the process of powder feeding additive manufacturing and its usage method. The present invention aims to solve the technical problem that the powder feeding channel inside the powder feeding mechanism is prone to blockage and difficult to clean during the process of powder feeding laser cladding additive manufacturing. The present invention realizes the automatic cleaning of the blocked powder inside the powder feeding mechanism by regulating the movement of the metal wire driven by the motor, providing strong support for the automation and intelligentization of the additive manufacturing process. The powder feeding nozzle for efficient self-cleaning in the process of powder feeding laser cladding additive manufacturing proposed by the present invention is simple to operate and small in size, and can adapt to various working conditions; the powder feeding nozzle for efficient self-cleaning in the process of powder feeding laser cladding additive manufacturing proposed by the present invention can be remotely controlled through computer programming, with a high degree of automation.

Description

Technical Field

[0001] The present invention relates to a powder feeding nozzle for cleaning powder blockage in the powder feeding additive manufacturing process and a method for using the same. Background Art

[0002] Metal laser additive manufacturing technology has currently become a key technology in intelligent manufacturing in the fields of aviation, aerospace, medical, automotive, etc. Laser additive manufacturing (LAM) is an additive manufacturing technology with a laser as the energy source. This technology has completely changed the traditional metal part processing mode and is mainly divided into selective laser melting technology (SLM) using powder bed powder laying and laser metal deposition technology (LMD) using a synchronous feeding method. Among them, laser metal deposition technology is further divided into powder feeding laser metal deposition and wire feeding laser metal deposition according to the form of the filler material. Powder feeding laser metal deposition has the advantages of high flexibility, high flexibility, and unrestricted processing size, and there is already a relatively mature manufacturing process. This technology uses a laser as the heat source, feeds powder into the molten pool to form a cladding layer, and then forms a complete workpiece by layer-by-layer and path-by-path stacking. The stability of powder delivery is one of the key factors affecting the forming quality of the workpiece. Under high-intensity and long-term work, powder blockage is likely to occur inside the powder feeding mechanism, resulting in problems such as unstable powder flow and uneven output powder distribution. To address this problem, the currently common method is to observe the powder output situation and the surface state of the molten pool with the naked eye or use a professional camera to photograph the morphology of the output powder. Most of the time, after problems occur, the powder feeding head is disassembled for inspection and then cleaned. This method has a cumbersome operation process and will cause great losses of manpower and material resources. Therefore, developing a highly efficient self-cleaning powder feeding nozzle for the powder feeding laser cladding additive manufacturing process has very important engineering significance. Summary of the Invention

[0003] The present invention aims to solve the technical problem that the powder feeding channel inside the powder feeding mechanism in the powder feeding laser cladding additive manufacturing process is easily blocked and difficult to clean, and provides a highly efficient self-cleaning powder feeding nozzle for the powder feeding laser cladding additive manufacturing process and a method for using the same.

[0004] The highly efficient self-cleaning powder feeding nozzle for the powder feeding laser cladding additive manufacturing process of the present invention is composed of a powder feeding head 1, a high-speed cleaning module 2, a motor control module 3, a powder feeding bin 4, and a bearing 5;

[0005] The center of the top of the powder feeding head 1 is a central axis connecting rod 1-1, and an external thread 1-1-1 is provided on the outer wall of the upper part of the central axis connecting rod 1-1; the middle part of the powder feeding head 1 is a convex platform 1-3, and a plurality of first circular powder feeding channels 1-2 are evenly arranged in a circle on the upper surface of the convex platform 1-3; a circular powder nozzle channel 1-4 is arranged inside the bottom of the powder feeding head 1, and the bottom of the first circular powder feeding channel 1-2 is communicated with the powder nozzle channel 1-4;

[0006] The described high-speed cleaning module 2 is of a ring structure. There is a ring of external gears 2-3 on its outer sidewall, and multiple second circular powder feeding channels 2-1 with the same diameter as the first circular powder feeding channel 1-2 are arranged on its upper surface for powder transmission. The number of the first circular powder feeding channels 1-2 is the same as that of the second circular powder feeding channels 2-1. There is a circular groove 2-4 at the middle position of the high-speed cleaning module 2. Multiple metal filaments 2-2 are vertically and fixedly arranged on the outer ring directly below each second circular powder feeding channel 2-1 within the circular groove 2-4. The length of the metal filaments 2-2 is 0.5 mm to 1 mm greater than the depth of the circular groove 2-4. A bearing 5 is also sleeved outside the central axis connecting rod 1-1. The high-speed cleaning module 2 is connected to the boss 1-3 through the bearing 5, and the high-speed cleaning module 2 rotates freely relative to the boss 1-3. During the additive manufacturing process, the central axes of the second circular powder feeding channels 2-1 coincide with the central axes of the first circular powder feeding channels 1-2. The lower surface of the high-speed cleaning module 2 is in close contact with the upper surface of the boss 1-3 (since the metal filaments 2-2 are relatively thin, the metal filaments 2-2 are slightly compressed and bent at this time).

[0007] A powder feeding port 4-1 is arranged on the upper surface of the described powder feeding bin 4. The center of the powder feeding bin 4 is of a hollow structure and an internal thread 4-2 is arranged on its inner wall. The powder feeding bin 4 is threadedly connected to the external thread 1-1-1 through the internal thread 4-2 to fix the powder feeding bin 4 on the central axis connecting rod 1-1. The lower end of the powder feeding bin 4 is in close contact with the upper end of the high-speed cleaning module 2 to form a sealed circular cavity for powder transmission.

[0008] The described motor control module 3 is composed of a transmission gear 3-1 and a control motor 3-2. The transmission gear 3-1 is fixed at the lower end of the control motor 3-2. The control motor 3-2 is arranged on the powder feeding bin 4, and the transmission gear 3-1 meshes with the external gear 2-3.

[0009] The usage method of the powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process of the present invention is as follows:

[0010] During the additive manufacturing process, the central axes of the second circular powder feeding channels 2-1 coincide with the central axes of the first circular powder feeding channels 1-2. Powder flows in from the powder feeding port 4-1 on the upper surface of the powder feeding bin 4, flows into the first circular powder feeding channel 1-2 after passing through the second circular powder feeding channels 2-1, and finally enters the powder nozzle channel 1-4 and is sent to the molten pool.

[0011] When there is a powder blockage problem at the upper position in the first circular powder feeding channel 1-2, first close the external powder feeder to stop powder feeding, start the control motor 3-2 to drive the transmission gear 3-1 to rotate at high speed. Since the external gear 2-3 meshes with the transmission gear 3-1, it drives the high-speed cleaning module 2 to rotate at high speed. During the rotation of the high-speed cleaning module 2, the metal filaments 2-2 on its lower surface move in the annular groove 2-4. Since the length of the metal filaments 2-2 is greater than the depth of the annular groove 2-4, the lower ends of the metal filaments 2-2 can enter the first circular powder feeding channel 1-2 to clean the blocked powder downward, thus achieving the purpose of self-cleaning. It can also sweep the powder leaking on the upper surface of the convex platform 1-3 into the first circular powder feeding channel 1-2.

[0012] The structure of the metal filaments 2-2 is similar to that of a steel brush, and the blocked powder is cleaned by frictional sweeping.

[0013] Advantages of the present invention:

[0014] 1. The present invention provides a powder feeding nozzle capable of achieving high-speed self-cleaning during the powder feeding type laser cladding additive manufacturing process. By adjusting the control motor 3-2 to drive the metal filaments 2-2 to move, the automatic cleaning of the blocked powder inside the powder feeding mechanism is realized, providing strong support for the automation and intelligence of the additive manufacturing process.

[0015] 2. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process proposed by the present invention is simple to operate and small in size, and can adapt to various working conditions;

[0016] 3. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process proposed by the present invention can be remotely controlled through computer programming, with a high degree of automation. Description of the drawings

[0017] Figure 1 It is a schematic diagram of the overall powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process in the first specific embodiment;

[0018] Figure 2 It is a schematic diagram of the overall powder feeding head 1 in the first specific embodiment;

[0019] Figure 3 It is a schematic diagram above the high-speed cleaning module 2 in the first specific embodiment;

[0020] Figure 4 It is a schematic diagram below the high-speed cleaning module 2 in the first specific embodiment;

[0021] Figure 5 For Figure 4 partial enlarged view of;

[0022] Figure 6Schematic diagram of the powder feeding bin 4 and the high-speed cleaning module 2 in Embodiment 1;

[0023] Figure 7 Schematic diagram of the motor control module 3 in Embodiment 1. Specific Embodiment

[0024] Specific Embodiment 1: This embodiment is a powder feeding nozzle for efficient self-cleaning in the process of powder feeding type laser cladding additive manufacturing. As Figures 1-7 shown, it is specifically composed of a powder feeding head 1, a high-speed cleaning module 2, a motor control module 3, a powder feeding bin 4 and a bearing 5;

[0025] The center of the top of the powder feeding head 1 is a central axis connecting rod 1-1, and an external thread 1-1-1 is provided on the outer wall of the upper part of the central axis connecting rod 1-1; the middle part of the powder feeding head 1 is a boss 1-3, and a plurality of first circular powder feeding channels 1-2 are evenly arranged in a circle on the upper surface of the boss 1-3; an annular powder nozzle channel 1-4 is arranged inside the bottom of the powder feeding head 1, and the bottom of the first circular powder feeding channel 1-2 is communicated with the powder nozzle channel 1-4;

[0026] The high-speed cleaning module 2 is of an annular structure, an outer gear 2-3 is arranged on the outer side wall, and a plurality of second circular powder feeding channels 2-1 with the same diameter as the first circular powder feeding channels 1-2 are arranged on the upper surface for powder transmission, and the number of the first circular powder feeding channels 1-2 is the same as that of the second circular powder feeding channels 2-1; a circular groove 2-4 is arranged at the middle position of the high-speed cleaning module 2, and a plurality of metal filaments 2-2 are vertically and fixedly arranged on the outer circle directly below each second circular powder feeding channel 2-1 in the circular groove 2-4, and the length of the metal filaments 2-2 is 0.5 mm to 1 mm greater than the depth of the circular groove 2-4; a bearing 5 is also sleeved outside the central axis connecting rod 1-1, and the high-speed cleaning module 2 is connected to the boss 1-3 through the bearing 5, and the high-speed cleaning module 2 rotates freely relative to the boss 1-3; during the additive manufacturing process, the central axis of the second circular powder feeding channel 2-1 coincides with the central axis of the first circular powder feeding channel 1-2; the lower surface of the high-speed cleaning module 2 is in close contact with the upper surface of the boss 1-3;

[0027] The upper surface of the powder feeding bin 4 is provided with a powder feeding port 4-1, the center of the powder feeding bin 4 is of a hollow structure and an internal thread 4-2 is arranged on its inner wall, and the powder feeding bin 4 is threadedly connected to the external thread 1-1-1 through the internal thread 4-2 to fix the powder feeding bin 4 on the central axis connecting rod 1-1; the lower end of the powder feeding bin 4 is in close contact with the upper end of the high-speed cleaning module 2 to form a sealed circular cavity for powder transmission;

[0028] The described motor control module 3 is composed of a transmission gear 3-1 and a control motor 3-2. The transmission gear 3-1 is fixed at the lower end of the control motor 3-2. The control motor 3-2 is arranged on the powder feeding bin 4, and the transmission gear 3-1 meshes with the external gear 2-3.

[0029] Specific Embodiment 2: The difference between this embodiment and Specific Embodiment 1 is that: the bearing 5 is a rolling bearing. Others are the same as Specific Embodiment 1.

[0030] Specific Embodiment 3: The difference between this embodiment and Specific Embodiment 1 or 2 is that: the module number of the transmission gear 3-1 and the external gear 2-3 is 1.25. Others are the same as Specific Embodiment 1 or 2.

[0031] Specific Embodiment 4: The difference between this embodiment and any one of Specific Embodiments 1 to 3 is that: the transmission ratio of the transmission gear 3-1 and the external gear 2-3 is 15:1. Others are the same as any one of Specific Embodiments 1 to 3.

[0032] Specific Embodiment 5: The difference between this embodiment and Specific Embodiment 4 is that: a computer is further arranged outside the powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process, and the signal input end of the control motor 3-2 is connected to the signal output end of the computer. Others are the same as Specific Embodiment 4.

[0033] Specific Embodiment 6: The difference between this embodiment and Specific Embodiment 5 is that: the diameter of the metal wire 2-2 is 0.1 mm and the material is stainless steel. Others are the same as Specific Embodiment 5.

[0034] Specific Embodiment 7: The difference between this embodiment and Specific Embodiment 6 is that: the metal wire 2-2 is connected to the surface of the annular groove 2-4 by brazing. Others are the same as Specific Embodiment 6.

[0035] Specific Embodiment 8: The difference between this embodiment and Specific Embodiment 7 is that: there are 20 first circular powder feeding channels 1-2, and the diameter is 10 mm. Others are the same as Specific Embodiment 8.

[0036] Specific Embodiment 9: The difference between this embodiment and Specific Embodiment 8 is that: the control motor 3-2 is a stepping motor. Others are the same as Specific Embodiment 8.

[0037] Specific Embodiment 10: This embodiment is the usage method of the powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process in Specific Embodiment 1. The specific process is as follows:

[0038] During the additive manufacturing process, the central axis of the second circular powder feeding channel 2-1 coincides with the central axis of the first circular powder feeding channel 1-2. The powder flows in from the powder feeding port 4-1 on the upper surface of the powder feeding bin 4, flows into the first circular powder feeding channel 1-2 after passing through the second circular powder feeding channel 2-1, and finally enters the powder nozzle channel 1-4 and is sent to the molten pool.

[0039] When a powder blockage problem occurs at a position near the upper part of the first circular powder feeding channel 1-2, first, close the external powder feeder to stop powder feeding, and start the control motor 3-2 to drive the transmission gear 3-1 to rotate at high speed. Since the external gear 2-3 meshes with the transmission gear 3-1, it drives the high-speed cleaning module 2 to rotate at high speed. During the rotation of the high-speed cleaning module 2, the metal filaments 2-2 on its lower surface move in the annular groove 2-4. Since the length of the metal filaments 2-2 is greater than the depth of the annular groove 2-4, the lower end of the metal filaments 2-2 can enter the first circular powder feeding channel 1-2 to clean the blocked powder downward, thereby achieving the purpose of self-cleaning. It can also sweep the powder leaking on the upper surface of the boss 1-3 into the first circular powder feeding channel 1-2.

[0040] The following experiments are used to verify the present invention:

[0041] Experiment 1: This experiment is a powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process. As Figures 1-7 shown, it is specifically composed of a powder feeding head 1, a high-speed cleaning module 2, a motor control module 3, a powder feeding bin 4, and a bearing 5.

[0042] The center of the top of the powder feeding head 1 is a central axis connecting rod 1-1, and an external thread 1-1-1 is provided on the outer wall of the upper part of the central axis connecting rod 1-1; the middle part of the powder feeding head 1 is a boss 1-3, and a plurality of first circular powder feeding channels 1-2 are evenly arranged in a circle on the upper surface of the boss 1-3; an annular powder nozzle channel 1-4 is arranged inside the bottom of the powder feeding head 1, and the bottom of the first circular powder feeding channel 1-2 is communicated with the powder nozzle channel 1-4.

[0043] The described high-speed cleaning module 2 is of a ring structure. An outer gear 2-3 is provided on the outer side wall, and a plurality of second circular powder feeding channels 2-1 with the same diameter as the first circular powder feeding channel 1-2 are provided on the upper surface for powder transmission. The number of the first circular powder feeding channels 1-2 is the same as that of the second circular powder feeding channels 2-1. A circular groove 2-4 is provided at the middle position of the high-speed cleaning module 2. A plurality of metal filaments 2-2 are vertically and fixedly provided on the outer ring directly below each second circular powder feeding channel 2-1 in the circular groove 2-4. The length of the metal filaments 2-2 is 0.5 mm to 1 mm greater than the depth of the circular groove 2-4. A bearing 5 is also sleeved outside the central axis connecting rod 1-1. The high-speed cleaning module 2 is connected to the boss 1-3 through the bearing 5, and the high-speed cleaning module 2 rotates freely relative to the boss 1-3. During the additive manufacturing process, the central axis of the second circular powder feeding channel 2-1 coincides with the central axis of the first circular powder feeding channel 1-2. The lower surface of the high-speed cleaning module 2 is in close contact with the upper surface of the boss 1-3.

[0044] A powder feeding port 4-1 is provided on the upper surface of the described powder feeding bin 4. The center of the powder feeding bin 4 is of a hollow structure and an internal thread 4-2 is provided on its inner wall. The powder feeding bin 4 is threadedly connected to the external thread 1-1-1 through the internal thread 4-2 to fix the powder feeding bin 4 on the central axis connecting rod 1-1. The lower end of the powder feeding bin 4 is in close contact with the upper end of the high-speed cleaning module 2 to form a sealed circular cavity for powder transmission.

[0045] The described motor control module 3 is composed of a transmission gear 3-1 and a control motor 3-2. The transmission gear 3-1 is fixed at the lower end of the control motor 3-2. The control motor 3-2 is arranged on the powder feeding bin 4, and the transmission gear 3-1 meshes with the outer gear 2-3.

[0046] The described bearing 5 is a rolling bearing.

[0047] The module of the transmission gear 3-1 and the outer gear 2-3 is 1.25.

[0048] The transmission ratio of the transmission gear 3-1 and the outer gear 2-3 is 15:1.

[0049] A computer is also provided outside the described powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process. The signal input end of the control motor 3-2 is connected to the signal output end of the computer.

[0050] The diameter of the described metal filaments 2-2 is 0.1 mm, and the material is stainless steel.

[0051] The metal filaments 2-2 are connected to the surface of the circular groove 2-4 through brazing.

[0052] There are 20 first circular powder feeding channels 1-2 in total, and the diameter is 10 mm.

[0053] The control motor 3-2 described above is a stepper motor;

[0054] The usage method of the powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process is as follows:

[0055] During the additive manufacturing process, the central axis of the second circular powder feeding channel 2-1 coincides with the central axis of the first circular powder feeding channel 1-2. The powder flows in from the powder feeding port 4-1 on the upper surface of the powder feeding bin 4, flows into the first circular powder feeding channel 1-2 after passing through the second circular powder feeding channel 2-1, and finally enters the powder nozzle channel 1-4 and is sent to the molten pool;

[0056] When there is a powder blockage problem at the position near the upper part in the first circular powder feeding channel 1-2, first close the external powder feeder to stop powder feeding, start the control motor 3-2 to drive the transmission gear 3-1 to rotate at high speed. Since the external gear 2-3 meshes with the transmission gear 3-1, the high-speed cleaning module 2 is driven to rotate at high speed. During the rotation of the high-speed cleaning module 2, the metal filaments 2-2 on its lower surface move in the annular groove 2-4. Since the length of the metal filaments 2-2 is greater than the depth of the annular groove 2-4, the lower end of the metal filaments 2-2 can enter the first circular powder feeding channel 1-2 to clean the blocked powder downward, thus achieving the purpose of self-cleaning. It can also sweep the powder leaking on the upper surface of the boss 1-3 into the first circular powder feeding channel 1-2.

[0057] The structure of the metal filaments 2-2 is similar to that of a steel brush, and the blocked powder is cleaned by friction sweeping.

[0058] The beneficial effects of this experiment:

[0059] 1. This experiment presents a powder feeding nozzle that can achieve high-speed self-cleaning during the powder feeding type laser cladding additive manufacturing process. By regulating the control motor 3-2 to drive the movement of the metal filaments 2-2, the automatic cleaning of the blocked powder inside the powder feeding mechanism is realized, providing strong support for the automation and intelligence of the additive manufacturing process.

[0060] 2. The powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process proposed in this experiment is simple to operate and small in size, and can adapt to various working conditions;

[0061] 3. The powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process proposed in this experiment can be remotely controlled through computer programming, with a high degree of automation.

Claims

1. A powder feeding nozzle for efficient self-cleaning in the process of powder feeding type laser cladding additive manufacturing, characterized in that The powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process is composed of a powder feeding head (1), a high-speed cleaning module (2), a motor control module (3), a powder feeding bin (4) and a bearing (5). The center of the top of the powder feeding head (1) is a central axis connecting rod (1-1), and an external thread (1-1-1) is arranged on the outer wall of the upper part of the central axis connecting rod (1-1); the middle part of the powder feeding head (1) is a convex platform (1-3), and a plurality of first circular powder feeding channels (1-2) are evenly arranged in a circle on the upper surface of the convex platform (1-3); an annular powder nozzle channel (1-4) is arranged inside the bottom of the powder feeding head (1), and the bottom of the first circular powder feeding channel (1-2) is communicated with the powder nozzle channel (1-4). The high-speed cleaning module (2) is of an annular structure, an outer gear (2-3) is arranged on the outer side wall, and a plurality of second circular powder feeding channels (2-1) with the same diameter as the first circular powder feeding channels (1-2) are arranged on the upper surface for powder transmission, and the number of the first circular powder feeding channels (1-2) is the same as that of the second circular powder feeding channels (2-1); an annular groove (2-4) is arranged at the middle position of the high-speed cleaning module (2), and a plurality of metal filaments (2-2) are vertically and fixedly arranged on the outer ring under each second circular powder feeding channel (2-1) in the annular groove (2-4), and the length of the metal filaments (2-2) is 0.5 mm to 1 mm greater than the depth of the annular groove (2-4); a bearing (5) is also sleeved outside the central axis connecting rod (1-1), and the high-speed cleaning module (2) is connected to the convex platform (1-3) through the bearing (5), and the high-speed cleaning module (2) rotates freely relative to the convex platform (1-3); during the additive manufacturing process, the central axes of the second circular powder feeding channels (2-1) coincide with the central axes of the first circular powder feeding channels (1-2); the lower surface of the high-speed cleaning module (2) is closely attached to the upper surface of the convex platform (1-3). A powder feeding port (4-1) is arranged on the upper surface of the powder feeding bin (4), the center of the powder feeding bin (4) is of a hollow structure and an internal thread (4-2) is arranged on its inner wall, and the powder feeding bin (4) is threadedly connected to the external thread (1-1-1) to fix the powder feeding bin (4) on the central axis connecting rod (1-1); the lower end of the powder feeding bin (4) is closely attached to the upper end of the high-speed cleaning module (2) to form a sealed circular cavity for powder transmission. The motor control module (3) is composed of a transmission gear (3-1) and a control motor (3-2), the transmission gear (3-1) is fixed at the lower end of the control motor (3-2), the control motor (3-2) is arranged on the powder feeding bin (4), and the transmission gear (3-1) is meshed with the outer gear (2-3).

2. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process according to claim 1, wherein The bearing (5) is a rolling bearing.

3. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process according to claim 1, wherein The module of the transmission gear (3-1) and the outer gear (2-3) is 1.

25.

4. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process according to claim 1, characterized in that The transmission ratio of the transmission gear (3-1) and the outer gear (2-3) is 15:

1.

5. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process according to claim 1, wherein A computer is also provided outside the powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process. The signal input end of the control motor (3-2) is connected to the signal output end of the computer.

6. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process according to claim 1, characterized in that The diameter of the metal wire (2-2) is 0.1 mm and its material is stainless steel.

7. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process according to claim 1, characterized in that The metal wire (2-2) is connected to the surface of the annular groove (2-4) by brazing.

8. The powder feeding nozzle for efficient self-cleaning in the process of powder feeding type laser cladding additive manufacturing according to claim 1, characterized in that There are 20 first circular powder feeding channels (1-2) with a diameter of 10 mm.

9. The powder feeding nozzle for efficient self-cleaning during the powder feeding type laser cladding additive manufacturing process according to claim 1, wherein The control motor (3-2) is a stepper motor.

10. The usage method of a powder feeding nozzle for efficient self-cleaning in the process of powder feeding type laser cladding additive manufacturing according to claim 1, characterized in that The usage method of the powder feeding nozzle for efficient self-cleaning in the powder feeding type laser cladding additive manufacturing process is as follows: During the additive manufacturing process, the central axis of the second circular powder feeding channel (2-1) coincides with the central axis of the first circular powder feeding channel (1-2). The powder flows in from the powder feeding port (4-1) on the upper surface of the powder feeding bin (4), flows into the first circular powder feeding channel (1-2) after passing through the second circular powder feeding channel (2-1), and finally enters the powder nozzle channel (1-4) and is sent to the molten pool. When there is a powder blockage problem at a position near the upper part of the first circular powder feeding channel (1-2), first close the external powder feeder to stop powder feeding, start the control motor (3-2) to drive the transmission gear (3-1) to rotate at high speed. Since the external gear (2-3) meshes with the transmission gear (3-1), the high-speed cleaning module (2) is driven to rotate at high speed. During the rotation of the high-speed cleaning module (2), the metal wire (2-2) on its lower surface moves in the annular groove (2-4). Since the length of the metal wire (2-2) is greater than the depth of the annular groove (2-4), the lower end of the metal wire (2-2) can enter the first circular powder feeding channel (1-2) to clean the blocked powder downward, thereby achieving the purpose of self-cleaning. It can also sweep the powder leaking on the upper surface of the boss (1-3) into the first circular powder feeding channel (1-2).

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