A powder particle spraying device

Abstract

The utility model discloses a kind of powder particle spraying devices;Including shell, inner cover, elastic sliding member and pressurized air supply part;Shell front end is equipped with spout, and outside is equipped with material bottle interface;Inner cover is inserted in shell rear end and is limited in shell interior, and inner cover inside is equipped with storage section;Elastic sliding member is inserted in inner cover rear end and slides in inner cover interior, and with storage section enclose and form storage cavity;Pressurized air supply part is installed in inner cover rear end and is in abutment with elastic sliding member;When pressing, push elastic sliding member from first position compression movement to second position, and generate towards storage cavity flow pressurized air current;When elastic sliding member is in first position, storage cavity is communicated with material bottle interface, in second position, storage cavity is communicated with spout.The scheme is through the position switching mechanism before and after pressing, ensure that the amount of powder particles stored in storage cavity is consistent in each pressing operation, and airflow pushes out process is stable, realizes the uniform control of single spraying amount.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a powder particle spraying device. Background Technology

[0002] In medical practice and laboratory research, the local delivery of powder particles (e.g., for wound treatment, tissue engineering, or drug coating) is an important and common technique. Powder particles, due to their wide availability, ability to carry various active ingredients, and adaptability to different forms (e.g., powder, microspheres), play a crucial role in a variety of scenarios.

[0003] However, existing technologies for spraying such powder particles onto target areas (such as wounds, tissue surfaces, or specific carriers) generally face the challenge of controlling the spray volume each time, leading to uneven distribution of powder particles within the target area. Furthermore, the difficulty in controlling the spray volume each time can result in insufficient or excessive particles in certain areas, thereby increasing potential risks. In addition, to achieve the desired coverage or dosage, operators often need to spray repeatedly, which not only prolongs the operation time and reduces efficiency but also easily leads to problems such as uncontrolled spraying or overspraying. Utility Model Content

[0004] The purpose of this invention is to provide a powder particle spraying device that aims to solve the problem of uneven spraying volume in existing devices for delivering powder particles.

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is achieved through the following technical solution: providing a powder particle spraying device, comprising:

[0006] The outer casing is hollow inside and has a spray nozzle at the front end, while the outer side has a material bottle interface.

[0007] An inner cover is inserted into the rear end of the outer shell and confined within the outer shell; the inner cover has a storage section inside the inner cover.

[0008] An elastic sliding member is inserted into the rear end of the inner cover and slides inside the inner cover, forming a storage cavity with the storage section;

[0009] The press-operated air supply unit is installed at the rear end of the inner cover and abuts against the elastic sliding member; it is used to push the elastic sliding member from the first position to the second position when pressed, and generate a press-operated airflow toward the storage cavity;

[0010] When the elastic sliding member is in the first position, the storage chamber is connected to the material bottle interface; when the elastic sliding member is in the second position, the storage chamber is connected to the spray nozzle.

[0011] Furthermore, the storage section of the inner cover is a non-closed cavity that runs through the top and bottom;

[0012] The elastic sliding member is provided with a first enclosure portion and a second enclosure portion, which are located at the top and bottom of the storage section, respectively.

[0013] When the elastic slider is in the first position, the first enclosure opens to drive the storage chamber to communicate with the bottle interface;

[0014] When the elastic slider is in the second position, the second enclosure opens to drive the storage chamber to communicate with the spray nozzle.

[0015] Furthermore, the elastic slider includes:

[0016] The movement has a front sliding limit located inside the inner cover and a rear end located outside the rear end of the inner cover.

[0017] An elastic element is installed at the rear end of the movement and undergoes elastic compression when the movement moves forward;

[0018] The sliding block is mounted on the movement at its rear end;

[0019] The front end of the movement and the front end of the sliding block form the first enclosure and the second enclosure.

[0020] Furthermore, the sliding block has a first connecting part at its rear end, and the movement has a second connecting part. The sliding block and the movement are connected through the first connecting part and the second connecting part.

[0021] Furthermore, the first enclosure is provided with a connecting port;

[0022] When the elastic sliding member is in the first position, the storage cavity and the bottle interface are connected through the communication port;

[0023] When the elastic slider is in the second position, the storage cavity is isolated from the bottle interface.

[0024] Furthermore, the sliding block is a groove structure with a accommodating space on its surface;

[0025] When the elastic sliding member is in the first position, the storage chamber is isolated from the spray nozzle;

[0026] When the elastic slider is in the second position, the sliding block storage chamber and the spray nozzle are connected through the sliding block receiving space.

[0027] Furthermore, the elastic element includes a compression spring fitted onto the movement.

[0028] Furthermore, the press-to-air unit includes an air bladder; the opening of the air bladder is connected to the rear end of the inner cover and communicates with the storage chamber;

[0029] When the airbag is pressed, the elastic slider is pushed from the first position to the second position, generating a pressurized airflow toward the storage chamber.

[0030] Furthermore, the outer shell is provided with a card interface, and the inner cover is provided with a buckle. The inner cover is engaged with the card interface by the buckle to be confined inside the outer shell.

[0031] Furthermore, the particle size of the powder particles ranges from 1 to 3000 micrometers.

[0032] The beneficial effects of this embodiment are as follows: In the initial state, the elastic slider is located in the first position. At this time, the storage chamber is connected to an external bottle through the bottle interface, and the powder particles enter the storage chamber from the bottle interface and are stored therein. When the user operates the press air supply unit, the pressing action pushes the elastic slider from the first position to the second position, and at the same time, the press air supply unit generates a press airflow towards the storage chamber. During the process of the elastic slider moving to the second position, the connection between the storage chamber and the bottle interface is cut off, and it is connected to the spray nozzle at the front end of the outer shell instead. At this time, the press airflow evenly sprays the powder particles in the storage chamber through the spray nozzle. Then, when the pressing action is released, the elastic slider elastically returns to the first position, and the storage chamber is reconnected to the bottle interface, and the connection is switched back to the bottle interface. At this time, the powder particles enter the storage chamber from the bottle interface again and are stored therein. By repeating this process and switching positions before and after pressing, the amount of powder particles stored in the storage chamber is consistent in each pressing operation, and the airflow propels the spraying process stably. This achieves highly uniform control of the spraying volume per spray, avoiding dosage fluctuations caused by unstable filling or spraying in traditional devices, and improving the reliability of the spraying device. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the overall structure of the powder and particle spraying device provided in an embodiment of the present invention.

[0035] Figure 2This is a cross-sectional structural diagram of the powder and particle spraying device provided in an embodiment of the present invention (with the elastic sliding member located in the first position).

[0036] Figure 3 This is a cross-sectional structural diagram of the powder and particle spraying device provided in an embodiment of the present invention (the elastic sliding member is located in the second position).

[0037] Figure 4 This is a partial structural schematic diagram of the powder and particle spraying device provided in an embodiment of the present invention.

[0038] Figure 5 for Figure 4 A first-person perspective diagram of the exploded structure.

[0039] Figure 6 for Figure 4 A second-view diagram of the explosion structure.

[0040] Figure 7 This is a schematic diagram of the assembly structure of the movement and the sliding block provided in an embodiment of the present utility model.

[0041] Figure 8 This is a schematic diagram of the assembly structure of the hybrid connector and the material bottle provided in an embodiment of the present invention.

[0042] Explanation of the markings in the image:

[0043] 1. Outer shell; 11. Spray nozzle; 12. Material bottle interface; 13. Extension plate;

[0044] 2. Inner cover; 21. Non-closed cavity; 22. Inlet; 23. Snap fastener;

[0045] 3. Elastic sliding element; 31. Mechanism; 311. Communicating port; 312. Second connecting part; 32. Sliding block; 321. First connecting part; 33. Elastic element;

[0046] 4. Press the air supply unit;

[0047] 5. Hybrid connector; 51. Protrusion;

[0048] 6. Material bottle. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0050] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0051] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0052] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0053] Please see Figures 1 to 4 This utility model provides a powder particle spraying device, comprising:

[0054] The outer casing 1 is hollow inside and has a spray nozzle 11 at the front end, and a material bottle interface 12 on the outside.

[0055] The inner cover 2 is inserted into the rear end of the outer shell 1 and is confined to the inside of the outer shell 1. The inner cover 2 has a material storage section inside.

[0056] The elastic sliding member 3 is inserted into the rear end of the inner cover 2 and slides inside the inner cover 2, and forms a storage cavity with the storage section;

[0057] The press-operated air supply unit 4 is installed at the rear end of the inner cover 2 and abuts against the elastic sliding member 3; it is used to push the elastic sliding member 3 from the first position to the second position when pressed, and generate a press airflow toward the storage chamber.

[0058] When the elastic sliding member 3 is in the first position, the storage chamber is connected to the material bottle interface 12; when the elastic sliding member 3 is in the second position, the storage chamber is connected to the spray nozzle 11.

[0059] In this embodiment, in the initial state, the elastic slider 3 is located in the first position. At this time, the storage chamber is connected to the external bottle 6 (for holding powder particles) through the bottle interface 12. The powder particles enter the storage chamber from the bottle interface 12 and are stored therein. When the user operates the press air supply unit 4, the pressing action pushes the elastic slider 3 from the first position to the second position, and at the same time, the press air supply unit 4 generates a press airflow towards the storage chamber. During the process of the elastic slider 3 moving to the second position, the connection between the storage chamber and the bottle interface 12 is cut off, and it is connected to the spray nozzle 11 at the front end of the outer shell 1. At this time, the press airflow sprays the powder particles in the storage chamber evenly through the spray nozzle 11. Then, when the pressing action is released, the elastic slider 3 elastically returns to the first position, and the storage chamber is reconnected to the bottle interface 12. At this time, the powder particles enter the storage chamber from the bottle interface 12 again and are stored therein. By repeating this process and switching positions before and after pressing, the amount of powder particles stored in the storage chamber is consistent in each pressing operation, and the airflow propels the spraying process stably. This achieves highly uniform control of the spraying volume per spray, avoiding dosage fluctuations caused by unstable filling or spraying in traditional devices, and improving the reliability of the spraying device.

[0060] In some embodiments, the device is suitable for spraying powder particles of various particle size ranges, including 1-3000 micrometers.

[0061] Preferably, the particles can be powder particles with a particle size range of 100-1000 micrometers.

[0062] Furthermore, this application can be equipped with press-type air supply units 4 of various specifications, each generating a different size of press-type airflow. Based on this, when spraying larger diameter powder particles, a press-type air supply unit 4 generating a larger press-type airflow can be selected to ensure that the powder particles are effectively dispersed and sprayed evenly. Conversely, when spraying smaller diameter powder particles, a press-type air supply unit 4 generating a smaller press-type airflow can be selected to avoid excessive dispersion leading to powder loss or uneven spraying. This design allows the device to adapt to the spraying needs of powder particles of different sizes, improving its practicality and flexibility.

[0063] Please see Figure 2 The shell 1 of this application will be described in detail below.

[0064] In one embodiment, the front end of the outer shell 1 has a gradually narrowing sandblasting nozzle, and the rear end of the outer shell 1 is an insertion port. The front end of the inner cover 2 can be inserted into the interior of the outer shell 1 through the insertion port at the rear end of the outer shell 1.

[0065] In one embodiment, the bottle interface 12 on the outer side of the outer shell 1 is adapted to the bottle opening of the bottle 6, and the bottle 6 can be stably installed in the bottle interface 12.

[0066] Combination Figure 3 and Figure 4 In one embodiment, the outer shell 1 is provided with a snap-fit ​​interface, and the inner cover 2 is provided with a snap-fit ​​23. The inner cover 2 is snapped into the snap-fit ​​interface by the snap-fit ​​23 to confine it inside the outer shell 1. The snap-fit ​​engagement prevents the inner cover 2 from shifting during operation, and it can also be easily separated for cleaning or maintenance during disassembly.

[0067] In one embodiment, the rear end of the housing 1 is further provided with an extension piece 13 facing outward, the extension piece 13 being used to assist the operator in holding the device with one hand for operation.

[0068] Combination Figures 4 to 6 The inner cover 2 of this application will be described in detail below.

[0069] In one embodiment, the storage section of the inner cover 2 is a non-closed cavity 21 that extends from the top to the bottom; the elastic sliding member 3 is provided with a first enclosure and a second enclosure, which are located at the top and bottom of the storage section, respectively; when the elastic sliding member 3 is in the first position, the first enclosure opens to drive the storage cavity to communicate with the bottle interface 12; when the elastic sliding member 3 is in the second position, the second enclosure opens to drive the storage cavity to communicate with the spray nozzle 11.

[0070] In this embodiment, the storage section of the inner cover 2 is designed as a non-closed cavity 21 with the top and bottom connected. The top of the storage section is the inlet 22, and the bottom of the storage section is a hollow structure. The first and second enclosures of the elastic slider 3 are located at the top and bottom of the storage section, respectively. When the elastic slider 3 is in the first position, the first enclosure is open, allowing the storage cavity to connect with the bottle interface 12 through the top, and the powder particles can flow smoothly into the storage cavity for filling. When the user presses the air supply part 4 to push the elastic slider 3 to the second position, the first enclosure closes to isolate the bottle interface 12, and the second enclosure opens, allowing the storage cavity to connect with the spray nozzle 11 through the bottom, and the powder particles are sprayed out under the action of airflow. Based on this, the opening and closing of the storage chamber are controlled by the mechanical switching action of the first enclosure and the second enclosure during the filling and spraying stages, respectively, to prevent powder particle leakage or external contamination. At the same time, it ensures that the storage chamber reaches the same volume each time it is filled, further enhancing the uniformity and consistency of the single spraying amount and reducing operational errors.

[0071] In one embodiment, the rear end of the inner cover 2 is further provided with an extension portion corresponding to the extension piece 24 in the outward direction, which facilitates the accurate installation of the inner cover 2.

[0072] The elastic slider 3 of this application is described in detail below.

[0073] In one embodiment, the elastic slider 3 includes a mechanism 31, an elastic element 33, and a sliding block 32; the front end of the mechanism 31 is located inside the inner cover 2, and the rear end of the mechanism 31 is located outside the rear end of the inner cover 2; the elastic element 33 is installed on the rear end of the mechanism 31, and the elastic element 33 is elastically compressed when the mechanism 31 moves forward; the rear end of the sliding block 32 is installed on the mechanism 31; wherein, the front end of the mechanism 31 and the front end of the sliding block 32 form a first enclosure and a second enclosure.

[0074] In this embodiment, the sliding limit of the mechanism 31 is located inside the inner cover 2, and the rear end of the mechanism 31 extends to the outside of the rear end of the inner cover 2. The rear end of the sliding block 32 is fixed to the mechanism 31, and the elastic element 33 (such as a compression spring) is fitted onto the rear end of the mechanism 31. When the user does not press, the elastic element 33 keeps the mechanism 31 and the sliding block 32 in the first position. The front end of the mechanism 31 and the front end of the sliding block 32 together form the first enclosure and the second enclosure, maintaining the filling state of the storage cavity. When the air supply part 4 is pressed, the mechanism 31 is pushed forward and slides, the elastic element 33 is compressed, and the mechanism 31 and the sliding block 32 move synchronously to the second position, and the enclosure switches to the connected state. Based on this, the integrated design of the mechanism 31, the sliding block 32 and the elastic element 33 provides a smooth and resettable sliding motion. The compression and storage of energy in the elastic element 33 allows the auxiliary device to quickly return to the first position when released, ensuring that the stroke of each spraying cycle is fixed, thereby maintaining the stable volume of the storage chamber, effectively supporting the uniform control of the single spraying amount, and improving the durability of the device.

[0075] Combination Figure 7 As shown, in one embodiment, the rear end of the sliding block 32 is provided with a first connecting part 321, and the movement 31 is provided with a second connecting part 312. The sliding block 32 and the movement 31 are connected through the first connecting part 321 and the second connecting part 312.

[0076] In this embodiment, the second connecting portion 312 at the rear end of the sliding block 32 is inserted into or engaged with the first connecting portion 321 on the movement 31, thus firmly fixing the sliding block 32 to the movement 31. During the movement of the elastic sliding member 3, this connection structure ensures that the sliding block 32 and the movement 31 move synchronously as a whole, avoiding relative displacement. Based on this, the connection between the first connecting portion 321 and the second connecting portion 312 enhances the structural stability of the component and prevents the sliding block 32 from loosening or shifting during operation. Furthermore, the first connecting portion 321 and the second connecting portion 312 can adopt a snap-fit ​​or plug-in structure.

[0077] In one embodiment, the first enclosure is provided with a communication port 311; when the elastic sliding member 3 is in the first position, the storage cavity and the bottle interface 12 are connected through the communication port 311; when the elastic sliding member 3 is in the second position, the storage cavity and the bottle interface 12 are isolated from each other.

[0078] In this embodiment, when the elastic sliding member 3 is in the first position, the connecting port 311 on the first enclosure directly connects the storage chamber and the bottle interface 12 (i.e., the connecting port 311, the inlet 22, and the bottle interface 12 are correspondingly connected), and the powder particles can flow into the storage chamber through the connecting port 311 (see reference). Figure 2 When the elastic slider 3 moves to the second position, the connecting port 311 on the first enclosure moves accordingly, and the storage chamber and the bottle interface 12 are closed by the non-connecting port position of the first enclosure, so that the bottle interface 12 and the inlet 22 are completely isolated from the storage chamber (see reference). Figure 3 ).

[0079] In one embodiment, the sliding block 32 is a groove structure with a accommodating space on its surface; when the elastic sliding member 3 is in the first position, the storage chamber is isolated from the spray nozzle 11; when the elastic sliding member 3 is in the second position, the storage chamber of the sliding block 32 and the spray nozzle 11 are connected through the accommodating space of the sliding block 32.

[0080] In this embodiment, the surface of the sliding block 32 is designed as a groove structure with a accommodating space. When the elastic sliding member 3 is in the first position, the accommodating space is the bottom space of the storage cavity and ensures that the bottom of the storage cavity is sealed. When the elastic sliding member 3 moves to the second position, the sliding block 32 moves accordingly, so that the accommodating space on the surface of the sliding block 32 is offset from the bottom of the storage cavity and communicates with the spray nozzle 11. At this time, the entire storage cavity will be connected with the spray nozzle 11. In this way, with the push of the airflow, the powder particles in the entire storage cavity can be sprayed out from the spray nozzle 11.

[0081] In one embodiment, the press-operated air supply unit 4 includes an airbag; the opening of the airbag is connected to the rear end of the inner cover 2 and communicates with the storage cavity; when the airbag is pressed, the elastic sliding member 3 is pushed from the first position to the second position and a press airflow is generated toward the storage cavity.

[0082] In this embodiment, the opening of the airbag is threaded to the rear end of the inner cover 2, and the opening of the airbag is connected to the storage chamber (i.e., airflow is possible). When the user squeezes the airbag, it deforms. While the airbag is deforming, it abuts against the rear end of the elastic sliding member 3, and the deformation force pushes the elastic sliding member 3 from the first position to the second position. On the other hand, the deformed airbag can generate a pressing airflow, which flows into the storage chamber and can spray the powder particles in the storage chamber out through the spray nozzle 11.

[0083] In this embodiment, the airbag serves as a simple air source, generating a stable and controllable airflow that propels the powder particles out evenly. Its flexible design makes it easy to operate, ensuring consistent airflow intensity with each press. This, combined with the fixed volume of the storage chamber, enables precise and uniform control of the amount sprayed per application, reducing the impact of human factors.

[0084] Please see Figure 8 In one embodiment, the powder spraying device further includes a mixing connector 5, which has two mating interfaces for holding the bottles 6 to be mixed; when the two bottles 6 are mated in the two mating interfaces, they are sealed and connected to each other.

[0085] In this embodiment, the mixing connector 5 has two mating interfaces. The interior of each interface can be designed to hold a protrusion 51 along the outer edge of the bottle opening 6. Each interface can hold one bottle 6. When two bottles 6 are engaged in the mating interfaces, they are interconnected through a sealing interface, allowing the powder particles to mix between the bottles. After mixing, the mixed powder particles are fed into the device through the bottle interface 12. Based on this, two-component or multi-component powder particle spraying can be achieved.

[0086] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A powder particle spraying device, characterized by, include: shell; It has a hollow interior and a spray nozzle at the front end, and a material bottle interface on the outside. An inner cover is inserted into the rear end of the outer shell and confined within the outer shell; the inner cover has a storage section inside the inner cover. An elastic sliding member is inserted into the rear end of the inner cover and slides inside the inner cover, forming a storage cavity with the storage section; The press-operated air supply unit is installed at the rear end of the inner cover and abuts against the elastic sliding member; it is used to push the elastic sliding member from the first position to the second position when pressed, and generate a press-operated airflow toward the storage cavity; When the elastic sliding member is in the first position, the storage chamber is connected to the material bottle interface; when the elastic sliding member is in the second position, the storage chamber is connected to the spray nozzle.

2. The powder particle spraying apparatus according to claim 1, wherein The storage section of the inner cover is a non-closed cavity that runs through the top and bottom. The elastic sliding member is provided with a first enclosure portion and a second enclosure portion, which are located at the top and bottom of the storage section, respectively. When the elastic slider is in the first position, the first enclosure opens to drive the storage chamber to communicate with the bottle interface; When the elastic slider is in the second position, the second enclosure opens to drive the storage chamber to communicate with the spray nozzle.

3. The powder particle spraying device of claim 2, wherein, The elastic slider includes: The movement has a front sliding limit located inside the inner cover and a rear end located outside the rear end of the inner cover. An elastic element is installed at the rear end of the movement and undergoes elastic compression when the movement moves forward; The sliding block is mounted on the movement at its rear end; The front end of the movement and the front end of the sliding block form the first enclosure and the second enclosure.

4. The powder particle spraying apparatus according to claim 3, wherein The sliding block has a first connecting part at its rear end, and the movement has a second connecting part. The sliding block and the movement are connected through the first connecting part and the second connecting part.

5. The powder / particle spraying device according to claim 3, characterized in that, The first enclosure is provided with a communication port; When the elastic sliding member is in the first position, the storage cavity and the bottle interface are connected through the communication port; When the elastic slider is in the second position, the storage cavity is isolated from the bottle interface.

6. The powder particle spraying apparatus of claim 3, wherein, The sliding block is a groove structure with a accommodating space on its surface; When the elastic sliding member is in the first position, the storage chamber is isolated from the spray nozzle; When the elastic slider is in the second position, the sliding block storage chamber and the spray nozzle are connected through the sliding block receiving space.

7. The powder particle spraying apparatus of claim 3, wherein, The elastic element includes a compression spring fitted onto the movement.

8. The powder particle spraying apparatus of claim 1, wherein, The press-to-air supply unit includes an air bladder; the opening of the air bladder is connected to the rear end of the inner cover and communicates with the storage chamber; When the airbag is pressed, the elastic slider is pushed from the first position to the second position, generating a pressurized airflow toward the storage chamber.

9. The powder particle sprinkling apparatus according to claim 1, wherein, The outer shell is provided with a card interface, and the inner cover is provided with a buckle. The inner cover is engaged with the card interface by the buckle to be confined inside the outer shell.

10. The powder particle sprinkling apparatus according to claim 1, wherein, The particle size of the powder is in the range of 1-3000 micrometers.

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