Device for preventing atomized powder from being blown back

Abstract

The utility model discloses a device for preventing atomized powder from being blown back, which comprises a restraining mechanism, a heating mechanism, a blowing mechanism and a control mechanism, the restraining mechanism is mounted on the inner side of a heating crucible, the restraining mechanism comprises a heat insulation plate, and a restraining cylinder is mounted at the lower end of the heat insulation plate; and the constraint airflow generation mechanism is arranged on the inner side of the atomization tower, and the upper end of the constraint airflow generation mechanism is provided with a connecting block and is connected with the inner wall of the atomization tower. The utility model belongs to the technical field of metal powder preparation, and aims to solve the problem that in the prior art, the effect of inhibiting backflow of superfine powder is poor. According to the technical effects, the exhaust holes are evenly formed in the lower side of the annular air pipe, inert gas in the annular air pipe can be guided out along with the exhaust holes, a downward stable airflow field is formed, it is guaranteed that powder which is not completely cooled is cooled in an accelerated mode, meanwhile, backflow superfine powder is blocked outside an incompletely-cooled area, and therefore the powder cooling efficiency is improved. And satellite powder is prevented from being formed by contact with powder which is not completely cooled, and the purpose of improving the sphericity degree of the powder is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal powder preparation, in particular to an anti-atomized powder blowback device. Background Art

[0002] Spherical metal powder has good fluidity, stable bulk density and other advantages, making it an essential raw material and consumable in the fields of metal 3D printing, surface cladding, spraying, metal injection molding, etc. The use of gas atomization technology to manufacture spherical metal powder has become one of the commonly used methods in industry, especially in the field of spherical metal powder manufacturing of titanium, zirconium and their alloys. The currently commonly used technology is to melt the raw material rod by high-frequency conical coil and crucible-free induction heating to form continuous or semi-continuous droplets, and then use high-pressure gas through a gas atomization nozzle to manufacture spherical metal and alloy powders.

[0003] The prior art uses similar devices to reduce the contact between the blown powder and the wall of the atomization chamber. At the same time, the reflected airflow after the gas passes through the atomization chamber wall can improve the trajectory of the jet airflow, reduce powder adhesion and agglomeration, and thus reduce the satellite powder content of the atomized powder. This method does not form a downward stable airflow field, but only plays a role in improving the trajectory of the jet airflow. It has a poor effect on reducing the backflow of ultrafine powders and is not suitable for atomization environments where the length of the atomization tower is limited and the backflow is serious. Utility Model Content

[0004] To this end, the utility model provides an anti-atomized powder blowback device to solve the above-mentioned problems in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] According to a first aspect of the utility model, a device for preventing atomized powder from blowing back comprises:

[0007] A restraining mechanism is installed on the inner side of the heating crucible, and the restraining mechanism comprises a heat-insulating plate, and a restraining cylinder is installed at the lower end of the heat-insulating plate;

[0008] The constrained airflow generating mechanism is arranged on the inner side of the atomizing tower, and a connecting block is installed on the upper end of the constrained airflow generating mechanism and is connected with the inner wall of the atomizing tower.

[0009] Furthermore, an inclined hole structure is provided on the inner side of the upper end of the heat insulation board.

[0010] Furthermore, a limiting block is installed on the lower side of the heating crucible, which is arranged on the lower side of the heating crucible, and the inner side of the upper end of the limiting block is inclined.

[0011] Furthermore, the limiting block is in a snap-fit ​​connection with the lower end of the heating crucible, and the lower end of the heating crucible is provided with an inclined hole structure.

[0012] Furthermore, the constrained airflow generating mechanism comprises an annular air pipe, and an exhaust hole is opened on the lower side of the annular air pipe.

[0013] Furthermore, the exhaust holes are evenly arranged on the lower side of the annular air pipe.

[0014] The utility model has the following advantages:

[0015] 1. Through the exhaust holes evenly arranged on the lower side of the annular air pipe, the inert gas in the annular air pipe can be discharged through the exhaust holes to form a downward stable airflow field, ensuring that the incompletely cooled powder is cooled faster, and at the same time, the refluxed ultrafine powder is blocked outside the incompletely cooled area to avoid contact with the incompletely cooled powder to form satellite powder, thereby achieving the purpose of improving the sphericity of the powder;

[0016] 2. Two cavities are formed inside the heating crucible through the heat insulation plate. The cavity located on the lower side of the heat insulation plate reduces the heat dissipated to the outside after the raw material rod passes through the constraint tube, thereby accelerating the melting efficiency of the raw material rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A front cross-sectional view of an anti-atomized powder blowback device provided in some embodiments of the utility model.

[0018] Figure 2 A front view of the connection between a heating crucible and a heating mechanism of an anti-atomized powder blowback device provided in some embodiments of the present invention.

[0019] Figure 3 A bottom view of a constrained airflow generating mechanism of an anti-atomized powder blowback device provided in some embodiments of the present utility model.

[0020] In the figure: 1. atomizing tower, 2. heating mechanism, 3. heating crucible, 4. restraining mechanism, 401. heat insulation board, 402. restraining cylinder, 5. nozzle, 6. connecting block, 7. restraining airflow generating mechanism, 701. annular air pipe, 702. exhaust hole, 8. limiting block. DETAILED DESCRIPTION

[0021] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0022] like Figures 1 to 3 As shown, an anti-atomized powder blowback device in the embodiment of the first aspect of the utility model comprises: an atomizing tower 1, a heating mechanism 2 is installed at the upper end thereof, and a heating crucible 3 is installed on the inner side of the heating mechanism 2, the raw material rod in the heating crucible 3 is heated by the heating mechanism 2 to melt it, and then the inclined setting of the bottom of the inner side of the heating crucible 3 is used to facilitate the drainage of the melted raw material, and a nozzle 5 is installed at the lower end of the heating mechanism 2, so that the nozzle 5 can spray the molten raw material, and through the inclined opening on the inner side of the lower end of the nozzle 5, the raw material is conveniently atomized and diffused;

[0023] The restraint mechanism 4 is installed on the inner side of the heating crucible 3. The restraint mechanism 4 includes a heat insulation plate 401. A restraint cylinder 402 is installed on the lower end of the heat insulation plate 401. An inclined hole structure is provided on the inner side of the upper end of the heat insulation plate 401 to facilitate the introduction of the raw material rod. The restraint cylinder 402 can increase the restraint on the outer side of the raw material rod to keep it upright, which is convenient for gradually melting the raw material rod. The heat insulation plate 401 forms two cavities on the inner side of the heating crucible 3. The cavity located on the lower side of the heat insulation plate 401 has less heat dissipated to the outside after the raw material rod is penetrated by the restraint cylinder 402, thereby accelerating the melting efficiency of the raw material rod.

[0024] The limit block 8 is arranged at the lower side of the heating crucible 3, and the inner side of the upper end of the limit block 8 is inclined. The limit block 8 is engaged with the lower end of the heating crucible 3. The lower end of the heating crucible 3 is provided with an inclined hole structure, which is convenient for aligning and installing the heating crucible 3 with the limit block 8 after replacement;

[0025] The constrained airflow generating mechanism 7 is arranged on the inner side of the atomizing tower 1, and the upper end of the constrained airflow generating mechanism 7 is installed with a connecting block 6 and connected to the inner wall of the atomizing tower 1. The constrained airflow generating mechanism 7 includes an annular air pipe 701, and the lower side of the annular air pipe 701 is provided with exhaust holes 702, and the exhaust holes 702 are evenly arranged on the lower side of the annular air pipe 701, so that the inert gas in the annular air pipe 701 can be discharged along the exhaust holes 702 to form a downward stable airflow field, thereby ensuring that the incompletely cooled powder is cooled faster, and at the same time, the refluxed ultrafine powder is blocked outside the incompletely cooled area to avoid contact with the incompletely cooled powder to form satellite powder, thereby achieving the purpose of improving the sphericity of the powder.

Claims

1. A device for preventing atomized powder from blowing back, characterized in that: include: A restraining mechanism (4) installed on the inner side of the heating crucible (3), the restraining mechanism (4) comprising a heat insulation plate (401), a restraining cylinder (402) being installed at the lower end of the heat insulation plate (401); The constrained airflow generating mechanism (7) is arranged on the inner side of the atomizing tower (1), and a connecting block (6) is installed on the upper end of the constrained airflow generating mechanism (7) and is connected to the inner wall of the atomizing tower (1).

2. The anti-atomized powder blowback device according to claim 1, characterized in that: An inclined hole structure is provided on the inner side of the upper end of the heat insulation board (401).

3. The anti-atomized powder blowback device according to claim 1, characterized in that: A limit block (8) is also installed on the lower side of the heating crucible (3), which is arranged on the lower side of the heating crucible (3), and the inner side of the upper end of the limit block (8) is arranged in an inclined manner.

4. The anti-atomized powder blowback device according to claim 3, characterized in that: The limiting block (8) is in a snap-fit ​​connection with the lower end of the heating crucible (3), and the lower end of the heating crucible (3) is provided with an inclined hole structure.

5. The anti-atomized powder blowback device according to claim 1, characterized in that: The constrained airflow generating mechanism (7) comprises an annular air pipe (701), and an exhaust hole (702) is provided on the lower side of the annular air pipe (701).

6. The anti-atomized powder blowback device according to claim 5, characterized in that: The exhaust holes (702) are evenly arranged on the lower side of the annular air pipe (701).

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