Metal 3D printer powder recycling device

Abstract

The utility model relates to metal 3D printing technical field, and its in order to solve the problem that the filter screen is abraded by metal powder and needs frequent replacement due to long -term use when the existing filter screen directly filters and recycles metal 3D printer powder, the utility model provides a kind of metal 3D printer powder recovery device, including air extraction pipe, jar body, buffer assembly and multistage filtering assembly;The top of the jar body is equipped with feed inlet;The air extraction pipe is communicated with the top of the jar body;The buffer assembly is located in the one end of the jar body close to the air extraction pipe;Multistage the filtering assembly is spaced apart in the inside of the jar body;The buffer assembly is located in the top of multistage the filtering assembly;The metal powder airflow that is drawn into jar body is decelerated and buffered in advance by the buffer assembly provided by the utility model, and cooperate with multistage filtering assembly to enhance buffering effect, realize the efficient recovery of powder and the effective removal of unqualified powder.

Description

Technical Field

[0001] This invention relates to the field of metal 3D printing technology, specifically to a powder recovery device for metal 3D printers. Background Technology

[0002] Laser selective melting (SLM) is widely used in metal 3D printing, with metal powder as its raw material. During the printing process, the fumes generated by the high-temperature vaporization of the molten pool scatter the laser beam, requiring a circulating airflow for cleaning. During this cleaning process, some normal powder is carried away from the powder bed and enters the fan filtration system. The powder that settles in the cyclone separation system accounts for about 20%-40% of the total powder consumption. This results in generally low powder utilization in metal 3D printing, leading to resource waste and increased costs.

[0003] In existing technologies, a filter screen is usually installed in the collection container for filtration and recycling. For example, the metal 3D printer powder recovery device disclosed in patent CN222326715U uses the rotation of an eccentric wheel to impact a lifting plate, causing a T-shaped block to slide in a T-groove, which in turn drives the rotation of a rotating plate. This rotation of the rotating plate drives the rotation of the filter screen, thus shaking the filter screen and separating the powder from the unqualified powder. However, to ensure filtration accuracy, the filter screen is often made of high-precision metal mesh (such as stainless steel woven mesh). After long-term friction with hard metal powder, it is prone to wear and tear, requiring regular replacement and resulting in a limited lifespan for the filter screen.

[0004] Based on the above description, there is an urgent need for a metal 3D printer powder recycling device that can efficiently recycle powder with a long service life. Utility Model Content

[0005] The purpose of this invention is to provide a metal 3D printer powder recovery device, which aims to solve the technical problem that the existing method of directly filtering and recovering metal 3D printer powder with a filter screen will cause the filter screen to be worn by metal powder after long-term use, requiring frequent replacement.

[0006] The embodiments of this utility model are achieved through the following technical solutions: A powder recycling device for a metal 3D printer includes an exhaust pipe, a tank, a buffer assembly, and a multi-stage filtration assembly; the top of the tank is provided with a feed inlet; the exhaust pipe is connected to the top of the tank; the buffer assembly is disposed inside the tank near the exhaust pipe; the multi-stage filtration assembly is spaced apart inside the tank; and the buffer assembly is disposed on top of the multi-stage filtration assembly.

[0007] Preferably, the buffer assembly is a buffer layer; the tank body is divided into a feeding chamber and a filtering chamber by the buffer layer; the exhaust pipe is connected to the feeding chamber; the multi-stage filtering assembly is disposed in the filtering chamber; the buffer layer is provided with multiple buffer channels at intervals along the axial direction; the feeding chamber is connected to the filtering chamber by the multiple buffer channels.

[0008] Preferably, the filter assembly includes a filter disc and a plurality of positioning blocks disposed at the bottom of the filter disc; the filter disc is disposed in the filter chamber; and the inner side wall of the tank is provided with a plurality of limiting grooves for the plurality of positioning blocks to be embedded.

[0009] Preferably, the filter disc is inclined and disposed inside the tank.

[0010] Preferably, the buffer assembly includes an arc-shaped perforated plate and an annular perforated plate; the arc-shaped perforated plate is disposed at one end of the tank body near the exhaust pipe; the arc-shaped perforated plate is connected to the inner side wall of the top of the tank body through the annular perforated plate; the arc-shaped perforated plate is disposed at the top of the multi-stage filtration assembly.

[0011] Preferably, the multiple filter components are spaced apart in the axial direction inside the tank; a first support component is provided between adjacent pairs of filter components.

[0012] Preferably, a second support component is provided between the arc-shaped perforated plate and the filter assembly.

[0013] Preferably, the spacing between the multi-stage filter components increases sequentially in the direction away from the exhaust duct.

[0014] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects: This invention uses a buffer component to slow down and buffer the airflow of metal powder drawn into the tank in advance, and works in conjunction with a multi-stage filtration component to enhance the buffering effect, thereby reducing the wear of metal powder on the filter disc and the tank, thus extending the service life of the filter disc, reducing the replacement frequency, and also enabling efficient recovery of powder and effective removal of unqualified powder. Attached Figure Description

[0015] Figure 1 The main sectional view provided for Example 1; Figure 2 for Figure 1 Enlarged schematic diagram of local structure A in the middle; Figure 3 Top sectional view provided for Example 1; Figure 4 The main sectional view provided for Example 2; Figure 5 for Figure 4 Enlarged schematic diagram of local structure B in the middle; Figure 6 This is a top sectional view provided for Example 2.

[0016] Icons: 1-Exhaust pipe, 2-Tank body, 3-Buffer assembly, 31-Buffer layer, 311-Buffer channel, 32-Arc-shaped perforated plate, 33-Annular perforated plate, 4-Filter assembly, 41-Filter disc, 42-Positioning block, 5-Limiting groove block, 6-First support assembly, 7-Second support assembly. Detailed Implementation

[0017] The specific implementation method is described below with reference to the accompanying drawings.

[0018] Example 1 Specifically, such as Figures 1 to 3 As shown, a powder recycling device for a metal 3D printer includes an exhaust pipe 1, a tank 2, a buffer assembly 3, and a multi-stage filter assembly 4. The top of the tank 2 has a feed inlet. The exhaust pipe 1 communicates with the top of the tank 2. The buffer assembly 3 is located inside the tank 2 near the exhaust pipe 1. The multi-stage filter assembly 4 is spaced apart inside the tank 2. The buffer assembly 3 is located on top of the multi-stage filter assembly 4. The buffer assembly 3 is a buffer layer 31. The tank 2 is divided into a feed chamber and a filter chamber by the buffer layer 31. The exhaust pipe 1 communicates with the feed chamber. The multi-stage filter assembly 4 is located inside the filter chamber. The buffer layer 31 has multiple buffer channels 311 spaced apart along the axial direction. The feed chamber communicates with the filter chamber through the multiple buffer channels 311.

[0019] In this embodiment, the filter assembly 4 includes a filter disc 41 and a plurality of positioning blocks 42 disposed at the bottom of the filter disc 41; the filter disc 41 is disposed in the filter chamber; the inner side wall of the tank body 2 is provided with a plurality of limiting grooves 5 for the plurality of positioning blocks 42 to be embedded.

[0020] In this embodiment, the buffer layer 31 is made of buffer materials suitable for high-hardness, high-temperature powder recycling scenarios, such as silicon carbide ceramic composite material, wear-resistant cast iron, and glass fiber reinforced polytetrafluoroethylene.

[0021] The working principle of this embodiment is as follows: The exhaust pipe 1 also introduces the powder airflow into the tank 2 through negative pressure. The smoke powder airflow enters from the top of the tank 2 and first passes through the buffer channels 311 of the buffer layer 31 for deceleration and buffering. Then it is further screened by the multi-stage filter discs 41. The filter discs 41 are inclined inside the tank 2 to further enhance the buffering effect, reduce the wear of metal powder on the filter discs 41 and the tank 2, thereby extending the service life of the filter discs 41, reducing the replacement frequency, and also realizing the efficient recovery of powder and the effective removal of unqualified powder.

[0022] Example 2 Specifically, such as Figures 4 to 6As shown, a powder recycling device for a metal 3D printer includes an exhaust pipe 1, a tank 2, a buffer assembly 3, and a multi-stage filter assembly 4. The tank 2 has a feed inlet at its top. The exhaust pipe 1 is connected to the top of the tank 2. The buffer assembly 3 is located inside the tank 2 near the exhaust pipe 1. The multi-stage filter assembly 4 is spaced apart inside the tank 2. The buffer assembly 3 is located on top of the multi-stage filter assembly 4. The buffer assembly 3 includes an arc-shaped perforated plate 32 and an annular perforated plate 33. The arc-shaped perforated plate 32 is located at the end of the tank 2 near the exhaust pipe 1. The arc-shaped perforated plate 32 is connected to the inner wall of the top of the tank 2 via the annular perforated plate 33. The arc-shaped perforated plate 32 is located on top of the multi-stage filter assembly 4.

[0023] In this embodiment, the multi-stage filter components 4 are spaced apart along the axial direction inside the tank 2; a first support component 6 is provided between adjacent pairs of filter components 4. A second support component 7 is provided between the arc-shaped perforated plate 32 and the filter components 4; wherein, the first support component 6 is a support cylinder or multiple support rods; similarly, the second support component 7 is also a support cylinder or multiple support rods.

[0024] In this embodiment, the filter component 4 is a perforated plate. The spacing of the multi-stage perforated plates increases sequentially along the direction away from the exhaust pipe 1, while the pore size gradually decreases at the same time, thereby achieving multi-stage sieving.

[0025] The working principle of this embodiment is as follows: the exhaust pipe 1 also introduces the powder airflow into the tank 2 through negative pressure; the buffer assembly 3 adopts a combination of arc-shaped perforated plate 32 and annular perforated plate 33. The curved structure of the arc-shaped perforated plate 32 can guide the airflow along the arc-shaped path, reduce the airflow speed, achieve preliminary buffering, and reduce the wear on the subsequent multi-stage filter assembly 4; the annular perforated plate 33 plays the role of fixing the arc-shaped perforated plate 32. The two work together to buffer the airflow and reduce the impact on the filter assembly below; the buffered airflow enters the multi-stage filter assembly 4 downwards. The adjacent filter assembly 4 maintains a stable distance through the first support assembly 6. The second support assembly 7 between the arc-shaped perforated plate 32 and the filter assembly 4 further enhances the stability of the upper structure of the device.

Claims

1. A powder recycling device for a metal 3D printer, comprising an exhaust pipe (1), characterized in that: It also includes a tank (2), a buffer assembly (3) and a multi-stage filter assembly (4); the top of the tank (2) is provided with a feed inlet; the exhaust pipe (1) is connected to the top of the tank (2); the buffer assembly (3) is located inside the tank (2) near the exhaust pipe (1); the multi-stage filter assembly (4) is spaced apart inside the tank (2); the buffer assembly (3) is located on top of the multi-stage filter assembly (4).

2. The metal 3D printer powder recycling device according to claim 1, characterized in that: The buffer assembly (3) is a buffer layer (31); the tank (2) is divided into a feeding chamber and a filtering chamber by the buffer layer (31); the exhaust pipe (1) is connected to the feeding chamber; the multi-stage filtering assembly (4) is disposed in the filtering chamber; the buffer layer (31) is provided with multiple buffer channels (311) at intervals along the axial direction; the feeding chamber is connected to the filtering chamber by multiple buffer channels (311).

3. The metal 3D printer powder recycling device according to claim 2, characterized in that: The filter assembly (4) includes a filter disc (41) and a plurality of positioning blocks (42) disposed at the bottom of the filter disc (41); the filter disc (41) is disposed in the filter chamber; the inner side wall of the tank (2) is provided with a plurality of limiting grooves (5) for the plurality of positioning blocks (42) to be embedded.

4. The metal 3D printer powder recycling device according to claim 3, characterized in that: The filter disc (41) is inclined inside the tank (2).

5. The metal 3D printer powder recycling device according to claim 1, characterized in that: The buffer assembly (3) includes an arc-shaped perforated plate (32) and an annular perforated plate (33); the arc-shaped perforated plate (32) is located at one end of the tank (2) near the exhaust pipe (1); the arc-shaped perforated plate (32) is connected to the inner side wall of the top of the tank (2) through the annular perforated plate (33); the arc-shaped perforated plate (32) is located at the top of the multi-stage filter assembly (4).

6. The metal 3D printer powder recycling device according to claim 5, characterized in that: The multi-stage filter components (4) are spaced apart in the axial direction inside the tank (2); a first support component (6) is provided between adjacent pairs of filter components (4).

7. The metal 3D printer powder recycling device according to claim 6, characterized in that: A second support component (7) is provided between the arc-shaped perforated plate (32) and the filter assembly (4).

8. The metal 3D printer powder recycling device according to claim 7, characterized in that: The spacing of the multi-stage filter components (4) increases sequentially in the direction away from the exhaust pipe (1).

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