A screening device for an air current classifier
By designing an inclined screen and a debris discharge port in the air classifier, and combining it with vibration cleaning by a pneumatic ultrasonic device, the problem of metal debris blockage was solved, and efficient continuous production of the air classifier was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA WEAPON SCI ACADEMY NINGBO BRANCH
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-14
AI Technical Summary
When processing metal powder prepared by gas atomization, existing air classifiers are prone to pipe blockage and classifier wheel jamming caused by metal fragments, resulting in low production efficiency and high manpower consumption.
Design an air classifier screening device, including an inclined screen and a fragment discharge port, combined with a pneumatic ultrasonic device for vibration cleaning, and a chuck structure for easy disassembly, to achieve effective separation of metal fragments and continuous production.
It effectively prevents the accumulation of metal fragments, avoids equipment failure, improves production efficiency, and enables continuous production.
Smart Images
Figure CN224486762U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a screening device, specifically to a screening device for an air classifier. Background Technology
[0002] Electrode-induction gas atomization is a technique that uses a high-speed gas flow to impact liquid metal, breaking it into micron-sized droplets, which are then rapidly cooled and solidified into spherical powders in an inert gas environment. The metal powders produced by gas atomization typically have a wide particle size range, from 0 to 250 μm, and include numerous millimeter-sized fragments. However, the raw material powders used in laser powder bed additive manufacturing (L-PBF) are typically 15-53 μm, those for electron beam powder bed additive manufacturing (E-PBF) are typically 53-105 μm, and those for injection molding (MIM) are typically 5-20 μm. Therefore, the wide-particle-size powders produced by gas atomization need to be sieved into powders of the required particle size for each technology.
[0003] An air classifier is a device that uses aerodynamic fields (centrifugal force, gravity, inertial force, etc.) to finely classify powder particles. The core of an air classifier is to separate coarse and fine particles by utilizing the difference in forces acting on particles within the airflow field.
[0004] However, if the powder produced by atomization is directly fed into the classifier, the millimeter-sized fragments can easily cause pipe blockage and jam the classifying wheel, leading to equipment failure. Therefore, the powder usually needs to be manually sieved using a 250μm sieve before being mechanically sieved using an air classifier. This not only greatly affects production efficiency but also consumes a lot of manpower. Summary of the Invention
[0005] The technical problem to be solved by this utility model is to provide a screening device for an air classifier that is simple in structure, reasonable in operation, and convenient in operation, in view of the above-mentioned technical status, which can effectively separate metal fragments in powder and improve the production efficiency of the classifier.
[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an air classifier screening device, characterized in that: it includes a shell, a powder feeding port is provided at the upper end of the shell, a backward-inclined screen is provided laterally in the middle of the shell, a fragment discharge port is provided at the bottom of the rear end of the shell, and an air classifier feed port is provided at the middle of the bottom of the shell.
[0007] As an improvement, the shell has a funnel-shaped structure with a flat upper surface, the powder feeding port is located on the front side of the upper end of the shell, and the upper part of the shell narrows backward and bends downward to form a fragment discharge port.
[0008] Furthermore, the lower part of the shell is conical, the feed inlet of the air classifier is located at the bottom middle of the conical structure, the height of the upper rear side of the conical structure is lower than the height of the upper front side, the upper rear side of the conical structure is connected to the rear bend of the shell, the screen is placed at an angle on the upper end of the conical structure, and the outer wall of the screen abuts against the inner wall of the shell.
[0009] Furthermore, the outer shell is equipped with a pneumatic ultrasonic device that can vibrate the shell and facilitate debris removal.
[0010] Finally, the powder feeding port, the fragment discharge port, and the air classifier inlet are each equipped with a chuck structure that can be connected to the chuck of the material tank.
[0011] Compared with existing technologies, the advantages of this invention are as follows: An inclined screen is installed inside the casing, along with a fragment discharge port, to filter metal fragments in the powder, preventing the accumulation of metal fragments from continuous screening at the screen and avoiding blockage of pipelines and jamming of the grading wheels, thus preventing production interruptions; a pneumatic ultrasonic device is installed outside the casing, vibrating to promptly remove fragments from the screen, improving cleaning efficiency; the powder feeding port, grading machine inlet, and fragment discharge port are all designed with chuck devices that can be connected to the material tank chuck for easy disassembly. This invention has a simple and reasonable structure, effectively separating metal fragments from the powder, enabling continuous production, and greatly improving the production efficiency of the grading machine. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0013] Figure 2 for Figure 1 Top view;
[0014] Figure 3 for Figure 2 A sectional view along line AA. Detailed Implementation
[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0016] like Figure 1 , 2 As shown in Figures 1 and 3, a screening device for an air classifier includes a housing 1. The upper end of the housing 1 is provided with a powder feeding port 11. The middle part of the housing 1 is provided with a rearwardly inclined screen 2. The bottom of the rear end of the housing is provided with a fragment discharge port 12. The middle position of the bottom of the housing 1 is provided with an air classifier feed port 13.
[0017] The specific structure is as follows: the shell 1 is a funnel-shaped structure with a flat upper surface. The powder feeding port 11 is located on the front side of the upper end of the shell 1. The upper part of the shell 1 narrows backward and bends downward to form a fragment discharge port 12. The lower part of the shell 1 is conical. The air classifier inlet 13 is located at the bottom middle of the conical structure 10. The height of the rear side of the upper end of the conical structure 10 is lower than the height of the front side of the upper end. The rear side of the upper end of the conical structure 10 is connected to the bend at the rear end of the shell 0. The screen 2 is placed at an angle on the upper end of the conical structure 10. The outer wall of the screen 2 abuts against the inner wall of the shell 1. In this way, the fragments can be gradually cleared out of the screen 2, preventing the accumulation of metal fragments generated by continuous screening at the screen 2 and causing production interruption. A pneumatic ultrasonic device is installed on the shell 1 to vibrate the shell 1 and make the fragments clear from the screen 2 in a timely manner.
[0018] The powder feeding port 11, the fragment discharge port 12, and the air classifier inlet 13 are each equipped with a chuck structure, which can be connected to the material tank chuck for easy disassembly and to seal and isolate air (argon protection is required when screening active metals).
[0019] During operation, the powder is added through the powder feeding port 11. Vibration is achieved by a pneumatic ultrasonic device, causing metal fragments to slide down along the inclined screen 2 and enter the fragment discharge port for separation. This effectively prevents metal fragments from accumulating at the screen 2 and causing production interruptions, thus greatly improving production efficiency.
[0020] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A screening device for an air classifier, characterized in that: It includes a shell, with a powder feeding port at the top, a backward-sloping screen in the middle of the shell, a fragment discharge port at the bottom of the rear end of the shell, and an air classifier feed port at the middle of the bottom of the shell.
2. The screening device according to claim 1, characterized in that: The shell has a funnel-shaped structure with a flat upper surface. The powder feeding port is located on the front side of the upper end of the shell. The upper part of the shell narrows backward and bends downward to form a fragment discharge port.
3. The screening device according to claim 2, characterized in that: The lower part of the shell is conical, and the feed inlet of the air classifier is located at the bottom middle of the conical structure. The height of the upper rear side of the conical structure is lower than the height of the upper front side. The upper rear side of the conical structure is connected to the bend at the rear end of the shell. The screen is placed at an angle on the upper end of the conical structure, and the outer wall of the screen abuts against the inner wall of the shell.
4. The screening device according to claim 1, 2, or 3, characterized in that: The shell is equipped with a pneumatic ultrasonic device that can vibrate the shell and facilitate the removal of debris.
5. The screening device according to claim 1, 2, or 3, characterized in that: The powder feeding port, the fragment discharge port, and the air classifier inlet are each equipped with a chuck structure that can be connected to the chuck of the material tank.