Powder distributor

Abstract

The invention relates to the technical field of 3D printing, in particular to a powder distributor, and aims to solve the problem that in the prior art, a powder distributor of a 3D device suitable for printing two or more metal materials at a time is lacked. In order to achieve the purpose, the powder distributor comprises a powder bin, a cantilever, an auger mechanism, a powder distribution opening, a motor and a plug pulling valve mechanism, metal powder is stored through the powder bin, the metal powder falling from the powder bin is guided out to the powder distribution opening through the auger mechanism, the powder distribution opening is opened through the plug pulling valve mechanism, and powder is distributed through the powder distribution opening. According to the powder distributor, through the structure, powder can directly fall, the uniform powder distribution thickness can be obtained, the metal powder density is enough, and therefore the powder distributor can be suitable for a 3D device for printing two or more metal materials at a time.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing technology, and in particular to SLS technology (Selective Laser Sintering). Specifically, a powder distributor for a 3D device used for printing two or more metal materials at a time is provided. Background Art

[0002] Up to now, some domestic and foreign manufacturers are at the forefront of the 3D printing technology that can print more than two metal materials at a time. The second or more metal powders are distributed by using a negative pressure suction plate to absorb the metal powder, and then using compressed air to blow away the metal powder outside the slice pattern. The negative pressure suction plate and the remaining metal powder are then moved to the corresponding position of the printing area, the negative pressure is removed, and the metal powder is scattered on the printing area by gravity.

[0003] Although this process is easy to implement, there are problems with the metal crystal structure after solidification being not ideal, which affects the overall mechanical properties of the part; the internal metal structure of the molded part will have quality defects such as pores, cracks and looseness; the first metal powder can easily be contaminated, resulting in part quality problems.

[0004] The above-mentioned technical difficulties have resulted in the technology of printing more than two metal materials at a time not being able to form products to meet market demand. Therefore, there is an urgent need to develop a 3D printing method and device for printing multiple metal materials at a time to overcome the above-mentioned technical difficulties. There is also an urgent need to develop a powder distributor suitable for the 3D device that prints more than two metal materials at a time. Summary of the Invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the prior art lacks a powder distributor suitable for a 3D device that prints more than two metal materials at a time.

[0006] The present invention provides a powder distributor, which is a cantilever structure and includes: Powder bin, hollow inside, used to store metal powder; A cantilever is provided below the powder bin, wherein the interior of the cantilever is filled with inert gas; an auger mechanism, disposed inside the cantilever and connected to the powder bin, for guiding the metal powder falling from the powder bin; a powder distribution port, provided at the cantilever end of the cantilever, for distributing the metal powder; a motor connected to the auger mechanism and configured to provide power to the auger mechanism; and A plug valve mechanism is partially arranged outside the cantilever and the remaining part is arranged inside the cantilever. The plug valve mechanism is connected to the powder distribution port and is configured to open or close the powder distribution port.

[0007] In the preferred technical solution of the above-mentioned powder distributor, the powder distributor further includes a three-way connector, one branch of the three-way connector is connected to the powder bin, another branch of the three-way connector is connected to the motor, and another branch of the three-way connector is connected to the auger mechanism.

[0008] In the preferred technical solution of the above-mentioned powder distributor, the auger mechanism includes a sleeve and an auger, the auger is arranged in the sleeve along the axial direction of the sleeve, and the auger is connected to the motor through a shaft.

[0009] In the preferred technical solution of the above-mentioned powder distributor, the powder distribution port is a rod with a hollow middle part, and the outside of the powder distribution port includes a first section, a second section, a third section and a fourth section from the first end to the second end. The first section to the third section are cylindrical sections and the diameters gradually decrease. The inner wall of the first section is provided with an internal thread for connecting the plug valve mechanism, the side wall of the first section is provided with a radial hole for connecting the auger mechanism, the fourth section is a conical section and is transitionally connected to the third section, and the fourth section has a mouth for discharging powder.

[0010] In the preferred technical solution of the above-mentioned powder distributor, the mouth of the fourth section is in the shape of a trumpet and is configured as a parabolic pressing mouth to compact the metal powder.

[0011] In the preferred technical solution of the above-mentioned powder distributor, the plug valve mechanism includes: an electromagnet, disposed outside the cantilever, and providing a driving force for the plug valve mechanism; A pull rod, a portion of which is located outside the cantilever and connected to the electromagnet, and the remaining portion of the pull rod is located inside the cantilever, and the pull rod is used for transmission; A rocker arm, one end of which is connected to the pull rod via a pin and is used to change the direction of movement; a slider, located above the other end of the rocker arm; A guide sleeve is located below the other end of the rocker arm and is fixedly connected to the powder distribution port to provide a movement guide for the needle valve; A needle valve is perpendicular to the cantilever, one end of which passes through the guide sleeve and the rocker arm and extends into the slider, and is installed in the slider through a pin shaft, and the other end is used to close or open the powder distribution port; Among them, the electromagnet generates a pulling force when it is energized, pulling the pull rod and driving the rocker arm to rotate, so that the needle valve is lifted and the powder dispensing port is opened. The electromagnet generates a thrust when it is de-energized, pushing the pull rod and driving the rocker arm to rotate, so that the needle valve falls and the powder dispensing port is closed.

[0012] In the preferred technical solution of the above-mentioned powder distributor, the needle valve is a solid rod, and the outside of the needle valve includes a first needle valve section, a second needle valve section, a third needle valve section, a fourth needle valve section and a fifth needle valve section from the first end to the second end. The first needle valve section to the fourth needle valve section are cylindrical sections, and the diameter of the first needle valve section is smaller than the diameter of the second needle valve section. The first needle valve section is provided with a needle valve radial through hole for passing the pin, and the surface of the first needle valve section below the needle valve radial through hole is provided with a symmetrical plane, which cooperates with the rocker arm to limit the rotation of the needle valve, and the diameters of the second needle valve section to the fourth needle valve section gradually decrease. The fifth needle valve section is a conical section and matches the mouth of the powder distribution port.

[0013] In the preferred technical solution of the above-mentioned powder distributor, the guide sleeve is a sleeve with an axially provided guide sleeve through hole, the guide sleeve through hole is used to accommodate the needle valve, the outside of the guide sleeve includes a frustum section, an external thread section and a conical section from the first end to the second end, the external thread section is fixedly connected to the internal thread of the first section of the powder distribution port, and the conical section is used to provide guidance for the metal powder.

[0014] In the preferred technical solution of the above-mentioned powder distributor, an external thread is provided at the lower position of the second section of the powder distribution port, and the powder distributor also includes a Z-direction adjustment mechanism, which is connected to the cantilever and the powder distribution port and is used to adjust the powder distribution thickness of the powder distribution port.

[0015] In the preferred technical solution of the above-mentioned powder distributor, the Z-direction adjustment mechanism includes: An adjusting bolt is installed below the first section of the powder distribution port and is threadedly connected to the cantilever; a back nut connected to the adjusting bolt; and A lock nut connected to the external thread of the second section of the powder distribution port; The adjusting bolt is engaged with the cantilever to adjust the position of the adjusting bolt relative to the cantilever, thereby adjusting the powder distribution thickness of the powder distribution port.

[0016] When adopting the above technical solution, the powder distributor of the present invention includes a powder hopper, a cantilever, an auger mechanism, a powder distribution port, a motor, and a plug valve mechanism. The powder hopper stores metal powder, the auger mechanism guides the metal powder that falls from the powder hopper to the powder distribution port, and the plug valve mechanism opens the powder distribution port to distribute the powder. The powder distributor of the present invention, through the above structure, can directly distribute powder, achieve a uniform powder thickness, and have sufficient metal powder density. Therefore, the powder distributor is suitable for 3D printing devices that print two or more metal materials at a time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 is a schematic three-dimensional diagram of a powder distributor according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic three-dimensional diagram of the middle powder distributor without the cantilever and connecting plate; Figure 3 yes Figure 1 A schematic three-dimensional diagram of the powder distributor without the cantilever, sleeve and guide sleeve; Figure 4 yes Figure 3 A magnified view of part A in FIG; Figure 5 yes Figure 1 Schematic three-dimensional diagram of the middle powder distribution port; Figure 6 yes Figure 1 A schematic perspective view of the middle rocker arm; Figure 7 yes Figure 1 A schematic perspective view of the middle slider; Figure 8 yes Figure 1 A schematic perspective view of the middle needle valve; Figure 9 yes Figure 1 Schematic perspective view of the middle guide sleeve.

[0018] The symbols in the figure mean the following: 100 powder dispensers, 10 powder bins, 20 cantilever, 30 auger mechanism, 31 casing, 32 auger, 40 powder distribution port, 41 first section, 411 internal thread, 412 radial hole, 42 second section, 421 external thread, 43 third section, 44 fourth section, 441 mouth, 50 motors, 60 Plug valve mechanism, 61 Electromagnet, 62 Pull rod, 63 Rocker arm, 631 First through hole, 632 Second through hole, 633 Notch, 64 Slider, 641 Slotted hole, 642 Slider through hole, 65 Guide sleeve, 651 Guide sleeve through hole, 652 Cone section, 653 External thread section, 654 Cone section, 66 Needle valve, 661 Needle valve first section, 6611 Needle valve radial through hole, 6612 Plane, 662 Needle valve second section, 663 Needle valve third section, 664 Needle valve fourth section, 665 Needle valve fifth section, 67 Spring, 70 tee connector, 71 plug, 80 connecting plate, 90 Z-axis adjustment mechanism, 91 adjusting bolt, 92 back nut, 93 lock nut. DETAILED DESCRIPTION

[0019] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications.

[0020] It should be noted that in the description of the present invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; they may refer to direct connection or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0022] like Figure 1 See also Figure 2-Figure 9, in order to solve the problem that the prior art lacks a powder distributor suitable for 3D printing of more than two metal materials at a time. The present invention provides a powder distributor 100, which is a cantilever structure and can generally include: a powder bin 10, a cantilever 20, an auger mechanism 30, a powder distribution port 40, a motor 50 and a plug valve mechanism 60. The interior of the powder bin 10 is hollow and is used to store metal powder. The cantilever 20 is arranged below the powder bin 10, and the interior of the cantilever 20 is filled with inert gas to avoid printing defects caused by oxygen contained in the cantilever 20. The auger mechanism 30 is arranged inside the cantilever 20 and is connected to the powder bin 10 for guiding the metal powder falling from the powder bin 10. The powder distribution port 40 is arranged at the cantilever end of the cantilever 20 for arranging the metal powder. The motor 50 is connected to the auger mechanism 30 for providing power to the auger mechanism 30. A portion of the plug valve mechanism 60 is disposed outside the cantilever 20 , and the remaining portion of the plug valve mechanism 60 is disposed inside the cantilever 20 . The plug valve mechanism 60 is connected to the powder distribution port 40 and is configured to open or close the powder distribution port 40 .

[0023] When the above technical solution is adopted, the powder distributor 100 of the present invention includes a powder bin 10, a cantilever 20, an auger mechanism 30, a powder distribution port 40, a motor 50, and a plug valve mechanism 60. The powder bin 10 stores metal powder, and the auger mechanism 30 guides the metal powder falling from the powder bin 10 to the powder distribution port 40. The plug valve mechanism 60 opens the powder distribution port 40 so that the powder distribution port 40 distributes powder. After the powder distribution is completed, the plug valve mechanism 60 closes the powder distribution port 40. Through the above structure, the powder distributor 100 of the present invention can directly drop powder, obtain a uniform powder distribution thickness, and have sufficient metal powder density. Therefore, the above powder distributor 100 is suitable for 3D devices that print two or more metal materials at a time.

[0024] As a possible implementation, Figure 1 See also Figure 2 The powder distributor 100 further includes a three-way connector 70, one branch of the three-way connector 70 is connected to the powder bin 10, as shown in FIG. Figure 1 The upper branch of the middle three-way connector 70 is connected to the powder bin 10, and the other branch of the three-way connector 70 is connected to the motor 50. Figure 1 The branch on the left side of the middle three-way connector 70 is connected to the motor 50, and another branch of the three-way connector 70 is connected to the auger mechanism 30. Figure 1 The branch on the right side of the middle three-way connector 70 is connected to the auger mechanism 30. Furthermore, the three-way connector 70 is connected to the motor 50 through a flange. A screw plug 71 is provided at the bottom of the three-way connector 70 for discharging excess metal powder.

[0025] As a possible implementation, Figure 2 See also Figure 3 、 Figure 4 The auger mechanism 30 includes a sleeve 31 and an auger 32 (see Figure 3 ), the auger 32 is arranged in the sleeve 31 along the axial direction of the sleeve 31, and the auger 32 is connected to the motor 50 through a shaft. Furthermore, a coupling is installed on the outside of the shaft.

[0026] As a possible implementation, Figure 5 As shown, the powder distribution port 40 is a rod with a hollow center. The exterior of the powder distribution port 40 includes a first section 41, a second section 42, a third section 43 and a fourth section 44 from the first end to the second end. The first section 41, the second section 42 to the third section 43 are cylindrical sections with gradually decreasing diameters. The inner wall of the first section 41 is provided with an internal thread 411 for connecting to the plug valve mechanism 60. The side wall of the first section 41 is provided with a radial hole 412 for connecting to the auger mechanism 30. The fourth section 44 is a conical section and is transitionally connected to the third section 43. The fourth section 44 has an opening 441 for discharging powder.

[0027] As a possible implementation, Figure 5 As shown, the mouth 441 of the fourth section 44 is in a trumpet shape and is configured as a parabolic pressing mouth to compact the metal powder.

[0028] As a possible implementation, Figure 2 As shown, the plug valve mechanism 60 includes: an electromagnet 61, a pull rod 62, a rocker arm 63, a slider 64, a guide sleeve 65 and a needle valve 66. The electromagnet 61 is arranged on the outside of the cantilever 20, and the electromagnet 61 provides driving force for the plug valve mechanism 60. The electromagnet 61 is fixed to the three-way connector 70 through the connecting plate 80. A part of the pull rod 62 is located outside the cantilever 20 and is connected to the electromagnet 61 through the connecting piece. The rest of the pull rod 62 is located inside the cantilever 20. The pull rod 62 is used for transmission. The rocker arm 63 is arranged inside the cantilever 20, and one end of the rocker arm 63 is connected to the pull rod 62 by a pin shaft. The rocker arm 63 is used to change the direction of movement. The slider 64 is arranged inside the cantilever 20, and the slider 64 is located above the other end of the rocker arm 63. The slider 64 is used to compensate for displacement. A guide sleeve 65 is disposed within the cantilever 20, below the other end of the rocker arm 63. The guide sleeve 65 is fixedly connected to the powder distribution port 40 and serves to provide a motion guide for the needle valve 66. The needle valve 66 is disposed within the cantilever 20, perpendicular to the cantilever 20. One end of the needle valve 66 passes through the guide sleeve 65 and the rocker arm 63 and extends into the slider 64, where it is mounted via a pin. The other end of the needle valve 66 is used to close or open the powder distribution port 40. When the electromagnet 61 is energized, it generates a pulling force, which pulls the pull rod 62 and drives the rocker arm 63 to rotate, causing the needle valve 66 to rise and open the powder distribution port 40. When the electromagnet 61 is de-energized, it generates a thrust, which pushes the pull rod 62 and drives the rocker arm 63 to rotate, causing the needle valve 66 to fall and close the powder distribution port.

[0029] Specifically, in other embodiments, the electromagnet 61 may also be replaced by a cylinder and a push rod, or by a motor.

[0030] As a possible implementation, Figure 6 As shown, rocker arm 63 is L-shaped, with a first through-hole 631 and a second through-hole 632 defined at one end and in the middle of rocker arm 63, respectively, for receiving corresponding pins. The pin at one end of rocker arm 63 connects to tie rod 62, while the pin in the middle of rocker arm 63 connects to cantilever 20, serving as the pivot axis of rocker arm 63. A notch 633 is defined at the other end of rocker arm 63, allowing needle valve 66 to pass through.

[0031] As a possible implementation, Figure 7 As shown, the slider 64 is provided with a slot 641 in the axial direction for passing the needle valve 66 so that the needle valve 66 can only move up and down. The slider 64 is provided with a slider through hole 642 in the radial direction for passing the pin shaft.

[0032] As a possible implementation, Figure 8 As shown, the needle valve 66 is a solid rod. From the first end to the second end, the exterior of the needle valve 66 comprises a first needle valve section 661, a second needle valve section 662, a third needle valve section 663, a fourth needle valve section 664, and a fifth needle valve section 665. The first needle valve section 661, the second needle valve section 662, the third needle valve section 663, and the fourth needle valve section 664 are cylindrical sections. The diameter of the first needle valve section 661 is smaller than that of the second needle valve section 662. The first needle valve section 661 is provided with a radial needle valve hole 6611 for the pin to pass through. A symmetrical flat surface 6612 is provided on the surface of the first needle valve section 661 below the radial needle valve hole 6611. The flat surface 6612 cooperates with the notch 633 of the rocker arm 63 to restrict the rotation of the needle valve 66. The diameters of the second needle valve section 662, the third needle valve section 663, and the fourth needle valve section gradually decrease. The fifth section 665 of the needle valve is a tapered section and matches the opening 441 of the powder distribution port 40 .

[0033] As a possible implementation, Figure 9 As shown, the guide sleeve 65 is a sleeve with a guide sleeve through hole 651 in the axial direction. The guide sleeve through hole 651 is used to accommodate the needle valve 66. The outer portion of the guide sleeve 65 includes a frustum section 652, an external thread section 653 and a conical section 654 from the first end to the second end. The external thread section 653 is connected to the powder distribution port 40 (see Figure 5 ) in the first paragraph 41 (cf. Figure 5 ) internal thread 411 (see Figure 5 The cone section 654 is used to provide a guide for the metal powder.

[0034] As a possible implementation, Figure 8 See also Figure 9The plug valve mechanism 60 further includes a spring 67, which is mounted on the first section 661 of the needle valve (see Figure 8 ) for buffering the plug valve mechanism 60 (see Figure 1 ) closing force.

[0035] As a possible implementation, Figure 5 As shown, the lower portion of the second section 42 of the powder dispensing port 40 is provided with an external thread 421. Figure 1 See also Figure 2 The powder distributor 100 further includes a Z-axis adjustment mechanism 90 connected to the cantilever 20 and the powder distribution port 40 for adjusting the powder distribution thickness of the powder distribution port 40 .

[0036] As a possible implementation, Figure 2 As shown, the Z-direction adjustment mechanism 90 includes: an adjusting bolt 91, a back nut 92 and a lock nut 93. The adjusting bolt 91 is installed in the first section 41 of the powder dispensing port 40 (see Figure 5 ) below and is threadedly connected to the cantilever 20, pressing against the lower end surface of the first section 41 of the powder distribution port 40. The back nut 92 is connected to the adjusting bolt 91 to lock the adjusting bolt 91. The lock nut 93 is connected to the second section 42 of the powder distribution port 40 (see Figure 5 ) external thread 421 (see Figure 5 ) on the cantilever 20 , and lock the adjustment position. The adjusting bolt 91 is engaged with the cantilever 20 to adjust the position of the adjusting bolt 91 relative to the cantilever 20 , thereby adjusting the powder distribution thickness of the powder distribution port 40 .

[0037] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A powder distributor, characterized in that: The powder distributor is a cantilever structure, comprising: Powder bin, hollow inside, used to store metal powder; A cantilever is provided below the powder bin, wherein the interior of the cantilever is filled with inert gas; an auger mechanism, disposed inside the cantilever and connected to the powder bin, for guiding the metal powder falling from the powder bin; a powder distribution port, provided at the cantilever end of the cantilever, for distributing the metal powder; a motor connected to the auger mechanism and configured to provide power to the auger mechanism; and A plug valve mechanism is partially arranged outside the cantilever and the remaining part is arranged inside the cantilever. The plug valve mechanism is connected to the powder distribution port and is configured to open or close the powder distribution port.

2. The powder distributor according to claim 1, characterized in that: It also includes a three-way connector, one branch of the three-way connector is connected to the powder bin, another branch of the three-way connector is connected to the motor, and another branch of the three-way connector is connected to the auger mechanism.

3. The powder distributor according to claim 1, characterized in that: The auger mechanism includes a sleeve and an auger. The auger is arranged in the sleeve along the axial direction of the sleeve. The auger is connected to the motor through a shaft.

4. The powder distributor according to claim 1, characterized in that: The powder distribution port is a rod with a hollow middle part. The outside of the powder distribution port includes a first section, a second section, a third section and a fourth section from the first end to the second end. The first section to the third section are cylindrical sections and the diameters gradually decrease. The inner wall of the first section is provided with an internal thread for connecting the plug valve mechanism. The side wall of the first section is provided with a radial hole for connecting the auger mechanism. The fourth section is a conical section and is transitionally connected to the third section. The fourth section has a mouth for discharging powder.

5. The powder distributor according to claim 4, characterized in that: The mouth of the fourth section is in a trumpet shape and is configured as a parabolic pressing mouth to compact the metal powder.

6. The powder distributor according to claim 4, characterized in that: The plug valve mechanism comprises: an electromagnet, disposed outside the cantilever, and providing a driving force for the plug valve mechanism; A pull rod, a portion of which is located outside the cantilever and connected to the electromagnet, and the remaining portion of the pull rod is located inside the cantilever, and the pull rod is used for transmission; A rocker arm, one end of which is connected to the pull rod via a pin and is used to change the direction of movement; a slider, located above the other end of the rocker arm; A guide sleeve is located below the other end of the rocker arm and is fixedly connected to the powder distribution port to provide a movement guide for the needle valve; A needle valve is perpendicular to the cantilever, one end of which passes through the guide sleeve and the rocker arm and extends into the slider, and is installed in the slider through a pin shaft, and the other end is used to close or open the powder distribution port; Among them, the electromagnet generates a pulling force when it is energized, pulling the pull rod and driving the rocker arm to rotate, so that the needle valve is lifted and the powder dispensing port is opened. The electromagnet generates a thrust when it is de-energized, pushing the pull rod and driving the rocker arm to rotate, so that the needle valve falls and the powder dispensing port is closed.

7. The powder distributor according to claim 6, characterized in that: The needle valve is a solid rod, and the exterior of the needle valve includes a first needle valve section, a second needle valve section, a third needle valve section, a fourth needle valve section and a fifth needle valve section from the first end to the second end. The first needle valve section to the fourth needle valve section are cylindrical sections, and the diameter of the first needle valve section is smaller than the diameter of the second needle valve section. The first needle valve section is provided with a needle valve radial through hole for passing the pin. A symmetrical plane is provided on the surface of the first needle valve section below the needle valve radial through hole, and the plane cooperates with the rocker arm to limit the rotation of the needle valve. The diameters of the second needle valve section to the fourth needle valve section gradually decrease. The fifth needle valve section is a conical section and matches the mouth of the powder distribution port.

8. The powder distributor according to claim 6, characterized in that: The guide sleeve is a sleeve with an axial guide sleeve through hole, and the guide sleeve through hole is used to accommodate the needle valve. The exterior of the guide sleeve includes a frustum section, an external thread section and a conical section from the first end to the second end. The external thread section is fixedly connected to the internal thread of the first section of the powder distribution port, and the conical section is used to provide guidance for the metal powder.

9. The powder distributor according to claim 6, characterized in that: An external thread is provided at the lower position of the second section of the powder distributing port, and the powder distributing device also includes a Z-direction adjustment mechanism, which is connected to the cantilever and the powder distributing port and is used to adjust the powder distributing thickness of the powder distributing port.

10. The powder distributor according to claim 9, characterized in that: The Z-direction adjustment mechanism includes: An adjusting bolt is installed below the first section of the powder distribution port and is threadedly connected to the cantilever; a back nut connected to the adjusting bolt; and A lock nut connected to the external thread of the second section of the powder distribution port; The adjusting bolt is engaged with the cantilever to adjust the position of the adjusting bolt relative to the cantilever, thereby adjusting the powder distribution thickness of the powder distribution port.

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