Flexible cloth powder port, flexible needle valve and cloth powder device

Abstract

The utility model relates to metal 3D printing technical field, concretely provides a flexible cloth powder port, flexible needle valve and cloth powder ware, aims at solving the problem that the existing technology is easy to appear warping when printing parts, leading to rigid cloth powder port and needle valve are damaged. For this purpose, the utility model's flexible cloth powder port adopts split type structure, including the first cloth powder stem made of rigid material and the second cloth powder stem made of flexible material, when printing parts appear warping, can produce elastic deformation, avoid printing parts and flexible cloth powder port being damaged. The utility model's flexible needle valve adopts split type structure, and its second needle valve stem is made of flexible material, can avoid printing parts and flexible needle valve being damaged. The utility model's cloth powder ware includes above-mentioned flexible cloth powder port and flexible needle valve, can avoid printing parts, flexible cloth powder port and flexible needle valve being damaged.

Description

Technical Field

[0001] This utility model relates to the field of metal 3D printing (additive manufacturing) technology, and in particular to a flexible powder feeding port, a flexible needle valve and a powder feeder. Background Technology

[0002] Metal 3D printing is an advanced manufacturing technology that directly creates complex metal parts by depositing layers of metal material, breaking through the limitations of traditional processing methods on the structural complexity of parts. Metal 3D printing technology can be divided into various processes according to different material forms and energy sources. Among them, SLS technology (Selective Laser Sintering) is one of the commercially mature mainstream technologies.

[0003] In SLS technology, the powder distributor of the 3D printing device is used to distribute metal powder. The powder distributor includes a rigid powder dispensing port and a needle valve. The metal powder is arranged by the needle valve cooperating with the powder dispensing port.

[0004] During the development of metal 3D printing, the uncertainty of the printing process makes it easy for printed parts to warp, leading to damage to the rigid powder distribution nozzle and needle valve. To solve this problem, there is an urgent need to develop a flexible powder distribution nozzle, a flexible needle valve, and a powder distributor. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that in the development process of existing metal 3D printing, due to the uncertainty of the printing process, the printed parts are prone to warping, which leads to damage to the rigid powder feeding port and needle valve.

[0006] In a first aspect, this utility model provides a flexible powder dispensing nozzle for dispensing metal powder. The flexible powder dispensing nozzle is a hollow rod with a split structure, and includes: The first powder-dispensing rod is made of rigid material; The second powder dispensing rod is made of a flexible material and has an opening for dispensing powder. The first powder-dispensing rod and the second powder-dispensing rod are connected by an insertion.

[0007] In the preferred embodiment of the above-mentioned flexible powder dispensing nozzle, the outer part of the first powder dispensing rod 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 with gradually decreasing diameters. The inner wall of the first section is provided with internal threads, and the side wall of the first section is provided with radial holes. The second section is provided with external threads, and the fourth section is a conical section with barbs at the end.

[0008] In the preferred embodiment of the above-mentioned flexible powder dispensing nozzle, the outer part of the second powder dispensing rod includes a flared section, a cylindrical section and a conical section from the first end to the second end, and the flared section and the barbs of the fourth section form an insertion connection.

[0009] In a second aspect, this utility model also provides a flexible needle valve, wherein the flexible needle valve is a solid rod, the flexible needle valve adopts a split structure, and the flexible needle valve includes: The first valve stem is made of a rigid material; The second needle valve rod is made of flexible material and is used to close or open the flexible powder application port. The first needle valve stem and the second needle valve stem are connected by an insertion.

[0010] In the preferred embodiment of the above-mentioned flexible needle valve, the outer part of the first needle valve rod from the first end to the second end includes a first needle valve section, a second needle valve section, a third needle valve section and a fourth needle valve section. 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 radial through hole and a symmetrical plane. The fourth needle valve section is provided with needle valve barbs.

[0011] In the preferred embodiment of the above-mentioned flexible needle valve, the outer side of the second needle valve rod includes a fifth needle valve section, a sixth needle valve section, and a needle valve cone section from the first end to the second end. The fifth needle valve section has a groove inside, and the groove matches the barbs of the needle valve to form an insertion structure. The needle valve cone section closes or opens the flexible powder application port.

[0012] In the preferred embodiment of the above-mentioned flexible needle valve, the number of barbs of the needle valve is multiple, and the number of grooves is multiple and corresponds one-to-one with the barbs of the needle valve.

[0013] In a third aspect, this utility model also provides a powder dispenser, which includes a flexible powder dispensing port and a flexible needle valve. The flexible powder dispensing nozzle is a hollow rod with a split structure. The flexible powder dispensing nozzle includes a first powder dispensing rod and a second powder dispensing rod. The first powder dispensing rod is made of a rigid material, and the second powder dispensing rod is made of a flexible material. The second powder dispensing rod has an opening for dispensing powder. The first powder dispensing rod and the second powder dispensing rod are connected by an insertion joint. The flexible needle valve is a solid rod with a split structure. The flexible needle valve includes a first needle valve rod and a second needle valve rod. The first needle valve rod is made of a rigid material, and the second needle valve rod is made of a flexible material. The second needle valve rod is used to close or open the flexible powder outlet. The first needle valve rod and the second needle valve rod are connected by an insertion.

[0014] In the preferred embodiment of the powder distributor described above, the outer part of the first powder distributor rod 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 with gradually decreasing diameters. The inner wall of the first section is provided with internal threads, and the side wall of the first section is provided with radial holes. The second section is provided with external threads, and the fourth section is a conical section with barbs at the end. The outer part of the first needle valve stem from the first end to the second end includes a first needle valve section, a second needle valve section, a third needle valve section and a fourth needle valve section. 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 radial through hole and a symmetrical plane. The fourth needle valve section is provided with needle valve barbs.

[0015] In the preferred embodiment of the powder applicator described above, the outer part of the second powder applicator rod includes a flared section, a cylindrical section and a conical section from the first end to the second end, and the flared section is connected to the barbs of the fourth section by an insertion connection. The second needle valve rod includes a fifth needle valve section, a sixth needle valve section, and a needle valve cone section from the first end to the second end. The fifth needle valve section has a groove inside, which matches the barbs of the needle valve to form an insertion structure. The needle valve cone section closes or opens the flexible powder application port.

[0016] With the above technical solutions adopted, the flexible toner nozzle of this utility model adopts a split structure, including a first toner dispensing rod and a second toner dispensing rod connected by an insertion joint. The first toner dispensing rod is made of a rigid material, and the second toner dispensing rod is made of a flexible material, making the flexible toner nozzle flexible. When the printed part warps, it can generate elastic deformation, avoiding damage to the printed part and the flexible toner nozzle. The flexible needle valve of this utility model adopts a split structure, including a first needle valve rod and a second needle valve rod connected by an insertion joint. The first needle valve rod is made of a rigid material, and the second needle valve rod is made of a flexible material, making the flexible needle valve flexible. When the printed part warps, it can generate elastic deformation, avoiding damage to the printed part, the flexible toner nozzle, and the flexible needle valve. The toner dispenser of this utility model includes the above-mentioned flexible toner nozzle and flexible needle valve, which can generate elastic deformation when the printed part warps, avoiding damage to the printed part, the flexible toner nozzle, and the flexible needle valve. Attached Figure Description

[0017] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which: Figure 1 This is a schematic wireframe diagram of the flexible powder outlet of this utility model; Figure 2 This is a schematic perspective view of the flexible powder outlet of this utility model; Figure 3 yes Figure 1 A schematic three-dimensional view of the first powder distribution rod of the medium-flexible powder distribution port; Figure 4 yes Figure 1 A schematic three-dimensional view of the second powder distribution rod at the medium-flexible powder distribution port; Figure 5 This is a schematic wireframe diagram of the flexible needle valve of this utility model; Figure 6 This is a schematic perspective view of the flexible needle valve of this utility model; Figure 7 yes Figure 1 A schematic 3D view of the first needle stem of a flexible needle valve; Figure 8 yes Figure 1 A schematic 3D view of the second needle valve stem of a flexible needle valve; Figure 9 This is a schematic perspective view of the powder dispenser of this utility model; Figure 10 yes Figure 9 A schematic 3D view of the powder distributor with the cantilever and connecting plate removed.

[0018] The symbols in the diagram represent the following meanings: 100 powder dispenser, 10 powder bins 20 cantilever, 30. Screw mechanism, 31. Sleeve 40 flexible powder outlet, 41 First powder-distributing rod, 411 First section, 412 Second section, 413 Third section, 414 Fourth section, 415 Internal thread, 416 Radial hole, 417 External thread, 418 Barbs 42 Second powder-dispensing rod, 421 Flared section, 422 Cylindrical section, 423 Conical section, 424 Mouth, 50 motors 60. Plug valve mechanism; 61. Electromagnet; 62. Pull rod; 63. Rocker arm; 64. Slider; 65. Guide sleeve; 66. Flexible needle valve. 661 First needle valve stem, 6611 First section of needle valve, 6612 Second section of needle valve, 6613 Third section of needle valve, 6614 Fourth section of needle valve, 6615 Radial through hole, 6616 Flat surface, 6617 Needle valve barbs 662 Second needle valve stem, 6621 Fifth section of needle valve, 6622 Sixth section of needle valve, 6623 Conical section of needle valve, 6624 Groove. 70 tee connector, 71 threaded plug, 80 connecting plate, 90 Z-axis adjustment mechanism, 91 adjusting bolt, 92 back nut, 93 lock nut Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of 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 can make adjustments as needed to adapt to specific application scenarios.

[0020] It should be noted that in the description of this utility model, 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 must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. 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 this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] like Figure 1 As shown, you can also see Figures 2-4 To address the problem in existing metal 3D printing development where uncertainties in the printing process easily lead to warping of printed parts, damaging rigid powder dispensing nozzles and needle valves, this invention provides a flexible powder dispensing nozzle 40 for distributing metal powder. The flexible powder dispensing nozzle 40 is a hollow rod with a split structure, generally comprising: a first powder dispensing rod 41 and a second powder dispensing rod 42. The first powder dispensing rod 41 is made of a rigid material, such as steel, stainless steel, or an alloy. The second powder dispensing rod 42 is made of a flexible material and has an opening 424 for powder dispensing. The flexible material can be rubber. The first powder dispensing rod 41 and the second powder dispensing rod 42 are connected by an insertion joint.

[0023] The flexible toner nozzle 40 of this utility model adopts a split structure, including a first toner rod 41 and a second toner rod 42 that are plugged in. The first toner rod 41 is made of rigid material, and the second toner rod 42 is made of flexible material, so that the flexible toner nozzle 40 is flexible. When the printed part warps, the second toner rod 42 made of flexible material can generate elastic deformation, avoiding damage to the printed part and the flexible toner nozzle 40.

[0024] As one possible implementation method, such as Figure 3 As shown, the outer surface of the first powder-dispensing rod 41 includes a first section 411, a second section 412, a third section 413, and a fourth section 414 from the first end to the second end. The first section 411, second section 412, and third section 413 are all cylindrical sections with gradually decreasing diameters. The inner wall of the first section 411 has an internal thread 415 for connecting to a stopcock valve mechanism. The side wall of the first section 411 has a radial hole 416 for connecting to a auger mechanism. The second section 412 has an external thread 417 for connecting to a Z-axis adjustment mechanism. The fourth section 414 is a tapered section 423, and its end has barbs 418.

[0025] As one possible implementation method, such as Figure 4 As shown, the exterior of the second powder-dispensing rod 42 includes a flared section 421, a cylindrical section 422, and a conical section 423 from the first end to the second end. The flared section 421 and the barbs 418 of the fourth section 414 form an interlocking connection and are interference fits.

[0026] like Figure 5 As shown, see also Figures 6-8 This utility model also provides a flexible needle valve 66, the orifice of which is a solid rod. The flexible needle valve 66 adopts a split structure and generally includes: a first needle valve rod 661 and a second needle valve rod 662. The first needle valve rod 661 is made of a rigid material, which can be a metal. The second needle valve rod 662 is made of a flexible material and is used to close or open the flexible powder application port 40. The flexible material can be rubber. The assembly position of the second needle valve rod 662 corresponds to the second powder application rod 42. The first needle valve rod 661 and the second needle valve rod 662 are plugged together.

[0027] The flexible needle valve 66 of this utility model adopts a split structure, including a first needle valve rod 661 and a second needle valve rod 662 that are plugged in. The first needle valve rod 661 is made of rigid material, and the second needle valve rod 662 is made of flexible material, which makes the flexible needle valve 66 flexible. When the printed part warps, the second needle valve rod 662 made of flexible material can generate elastic deformation, avoiding damage to the printed part and the flexible needle valve 66.

[0028] As one possible implementation method, such as Figure 7 As shown, the outer surface of the first needle valve stem 661, from the first end to the second end, includes a first needle valve section 6611, a second needle valve section 6612, a third needle valve section 6613, and a fourth needle valve section 6614. The diameter of the first needle valve section 6611 is smaller than the diameter of the second needle valve section 6612. The first needle valve section 6611 has a radial through hole 6615 for a pin to pass through, connecting the flexible needle valve 66 to the slider. The surface of the first needle valve section 6611 below the radial through hole 6615 has a symmetrical plane 6616, which cooperates with the rocker arm to restrict the rotation of the flexible needle valve 66. The fourth needle valve section 6614 has needle valve barbs 6617.

[0029] As one possible implementation method, such as Figure 8 As shown, the outer surface of the second needle valve stem 662, from the first end to the second end, includes a fifth needle valve section 6621, a sixth needle valve section 6622, and a needle valve cone section 6623. The fifth needle valve section 6621 has a groove 6624 inside, which mates with the needle valve barb 6617 to form a plug-in structure and an interference fit. The needle valve cone section 6623 closes or opens the flexible powder application port 40.

[0030] In one possible implementation, the number of needle valve barbs 6617 is multiple, and the number of grooves 6624 is multiple and corresponds one-to-one with the needle valve barbs 6617. For example, the number of needle valve barbs 6617 is two, and the number of grooves 6624 is two. The number of needle valve barbs 6617 can also be three, and the number of grooves 6624 can be three. The number of needle valve barbs 6617 can also be four, and the number of grooves 6624 can be four.

[0031] In the third aspect, such as Figure 9 As shown, see also Figure 1-8 and Figure 10 This utility model also provides a powder distributor 100 with a cantilever structure, such as... Figure 9 As shown, the powder distributor 100 generally includes: a powder hopper 10, a cantilever 20, an auger mechanism 30, a flexible powder dispensing port 40, a motor 50, a stopper valve mechanism 60, a three-way connector 70, a connecting plate 80, and a Z-axis adjustment mechanism 90. The powder hopper 10 is used to store metal powder. The auger mechanism 30 is used to discharge the metal powder falling from the powder hopper 10. The flexible powder dispensing port 40 is used to dispense the metal powder. The motor 50 provides power to the auger mechanism 30. The stopper valve mechanism 60 is configured to open or close the flexible powder dispensing port 40. Figure 10 As shown, the stopper valve mechanism 60 includes: an electromagnet 61, a pull rod 62, a rocker arm 63, a slider 64, a guide sleeve 65, and a flexible needle valve 66 (see [reference]). Figure 5Electromagnet 61 provides driving force for the stopcock valve mechanism 60. Pull rod 62 is used for transmission. Rocker arm 63 is used to change the direction of movement. Slider 64 is used to compensate for displacement. Guide sleeve 65 provides motion guidance for flexible needle valve 66. Flexible needle valve 66 is used to close or open flexible powder outlet 40. Specifically, when electromagnet 61 is energized, it generates pulling force, pulling pull rod 62 and rotating rocker arm 63, causing flexible needle valve 66 to rise and open flexible powder outlet 40. When electromagnet 61 is de-energized, it generates pushing force, pushing pull rod 62 and rotating rocker arm 63, causing flexible needle valve 66 to fall and close flexible powder outlet 40. A plug 71 is provided at the lower part of the three-way connector 70, which is used to discharge excess metal powder. Z-axis adjustment mechanism 90 includes: adjusting bolt 91, back nut 92, and lock nut 93.

[0032] like Figure 9 As shown, see also Figures 1-4 The flexible powder dispensing nozzle 40 is a hollow rod with a split structure. It includes a first powder dispensing rod 41 and a second powder dispensing rod 42. The first powder dispensing rod 41 is made of a rigid material, and the second powder dispensing rod 42 is made of a flexible material. The second powder dispensing rod 42 has an opening 424 for dispensing powder. The first powder dispensing rod 41 and the second powder dispensing rod 42 are connected by an insertion joint. Figure 5 As shown, see also Figures 6-8 The flexible needle valve 66 is a solid rod. The flexible needle valve 66 adopts a split structure. The flexible needle valve 66 includes a first needle valve rod 661 and a second needle valve rod 662. The first needle valve rod 661 is made of rigid material, and the second needle valve rod 662 is made of flexible material. The second needle valve rod 662 is used to close or open the flexible powder outlet 40. The first needle valve rod 661 and the second needle valve rod 662 are connected by insertion.

[0033] The toner dispenser of this invention includes the aforementioned flexible toner outlet 40 and flexible needle valve 66. Therefore, when the printed part warps, the second toner rod 42 and the second needle valve rod 662, made of flexible material, can undergo elastic deformation, preventing damage to the printed part, the flexible toner outlet 40, and the flexible needle valve 66.

[0034] As one possible implementation method, such as Figure 3 As shown, the outer surface of the first powder-dispensing rod 41 includes a first section 411, a second section 412, a third section 413, and a fourth section 414 from the first end to the second end. The first section 411 to the third section 413 are cylindrical sections with gradually decreasing diameters. The inner wall of the first section 411 has an internal thread 415, and the side wall of the first section 411 has a radial hole 416. The second section 412 has an external thread 417, and the fourth section 414 is a tapered section with barbs 418 at its end. Figure 7As shown, the outer part of the first needle valve stem 661 from the first end to the second end includes a first needle valve section 6611, a second needle valve section 6612, a third needle valve section 6613, and a fourth needle valve section 6614. The diameter of the first needle valve section 6611 is smaller than the diameter of the second needle valve section 6612. The first needle valve section 6611 is provided with a radial through hole 6615 and a symmetrical plane 6616. The fourth needle valve section 6614 is provided with needle valve barbs 6617.

[0035] As one possible implementation method, such as Figure 4 As shown, the exterior of the second powder-dispensing rod 42, from the first end to the second end, includes a flared section 421, a cylindrical section 422, and a conical section 423. The flared section 421 forms an insertion connection with the barbs 418 of the fourth section 414. Figure 8 As shown, the exterior of the second needle valve stem 662 from the first end to the second end includes a fifth needle valve section 6621, a sixth needle valve section 6622, and a needle valve cone section 6623. The interior of the fifth needle valve section 6621 is provided with a groove 6624. The groove 6624 and the needle valve barb 6617 are matched to form a plug-in structure. The needle valve cone section 6623 closes or opens the flexible powder application port 40.

[0036] The technical solution of this utility model has 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 protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A flexible powder dispensing nozzle for dispensing metal powder, characterized in that, The flexible powder dispensing nozzle is a hollow rod-like component. The flexible powder dispensing nozzle adopts a split structure and includes: The first powder-dispensing rod is made of rigid material; The second powder dispensing rod is made of a flexible material and has an opening for dispensing powder. The first powder-dispensing rod and the second powder-dispensing rod are connected by an insertion.

2. The flexible powder dispensing nozzle according to claim 1, characterized in that, The outer part of the first powder-dispensing rod 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 with gradually decreasing diameters. The inner wall of the first section is provided with internal threads, and the side wall of the first section is provided with radial holes. The second section is provided with external threads, and the fourth section is a conical section with barbs at the end.

3. The flexible powder dispensing nozzle according to claim 2, characterized in that, The exterior of the second powder-dispensing rod includes a flared section, a cylindrical section, and a conical section from the first end to the second end. The flared section is connected to the barbs of the fourth section by an insertion joint.

4. A flexible needle valve, characterized in that, The flexible needle valve is a solid rod, and the flexible needle valve adopts a split structure. The flexible needle valve includes: The first valve stem is made of a rigid material; The second needle valve rod is made of flexible material and is used to close or open the flexible powder application port. The first needle valve stem and the second needle valve stem are connected by an insertion.

5. The flexible needle valve according to claim 4, characterized in that, The outer part of the first needle valve stem from the first end to the second end includes a first needle valve section, a second needle valve section, a third needle valve section and a fourth needle valve section. 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 radial through hole and a symmetrical plane. The fourth needle valve section is provided with needle valve barbs.

6. The flexible needle valve according to claim 5, characterized in that, The second needle valve rod includes a fifth needle valve section, a sixth needle valve section, and a needle valve cone section from the first end to the second end. The fifth needle valve section has a groove inside, which matches the barbs of the needle valve to form an insertion structure. The needle valve cone section closes or opens the flexible powder application port.

7. The flexible needle valve according to claim 6, characterized in that, The needle valve has multiple barbs, and the grooves have multiple grooves that correspond one-to-one with the needle valve barbs.

8. A powder dispenser, characterized in that, The powder dispenser includes a flexible powder dispensing port and a flexible needle valve. The flexible powder dispensing nozzle is a hollow rod with a split structure. The flexible powder dispensing nozzle includes a first powder dispensing rod and a second powder dispensing rod. The first powder dispensing rod is made of a rigid material, and the second powder dispensing rod is made of a flexible material. The second powder dispensing rod has an opening for dispensing powder. The first powder dispensing rod and the second powder dispensing rod are connected by an insertion joint. The flexible needle valve is a solid rod with a split structure. The flexible needle valve includes a first needle valve rod and a second needle valve rod. The first needle valve rod is made of a rigid material, and the second needle valve rod is made of a flexible material. The second needle valve rod is used to close or open the flexible powder outlet. The first needle valve rod and the second needle valve rod are connected by an insertion.

9. The powder distributor according to claim 8, characterized in that, The outer part of the first powder-dispensing rod from the first end to the second end includes a first section, a second section, a third section and a fourth section. The first section to the third section are cylindrical sections with gradually decreasing diameters. The inner wall of the first section is provided with internal threads, and the side wall of the first section is provided with radial holes. The second section is provided with external threads, and the fourth section is a conical section with barbs at the end. The outer part of the first needle valve stem from the first end to the second end includes a first needle valve section, a second needle valve section, a third needle valve section and a fourth needle valve section. 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 radial through hole and a symmetrical plane. The fourth needle valve section is provided with needle valve barbs.

10. The powder distributor according to claim 9, characterized in that, The exterior of the second powder-dispensing rod includes a flared section, a cylindrical section, and a conical section from the first end to the second end. The flared section and the barbs of the fourth section form an insert connection. The second needle valve rod includes a fifth needle valve section, a sixth needle valve section, and a needle valve cone section from the first end to the second end. The fifth needle valve section has a groove inside, which matches the barbs of the needle valve to form an insertion structure. The needle valve cone section closes or opens the flexible powder application port.

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