Continuous powder feeding device

Abstract

The utility model belongs to the field of additive manufacturing, and relates to a continuous powder feeding device which comprises a powder storage barrel, a vacuum powder feeding pipe air inlet pipe, a powerful powder feeding pipe, a vacuum powder feeding pipe and a negative pressure generating device, and the vacuum powder feeding pipe air inlet pipe is communicated with the vacuum powder feeding pipe. The powder storage barrel is communicated with the negative pressure generating device through a vacuum powder feeding pipe; and the powerful powder feeding pipe is communicated with the vacuum powder feeding pipe. The continuous powder feeding device can prevent the conveying pipeline from being blocked, and is stable in pipeline pressure and high in powder feeding efficiency.

Description

Technical Field

[0001] The utility model belongs to the field of additive manufacturing and relates to a powder feeding device, in particular to a continuous powder feeding device. Background Art

[0002] In the process of metal additive manufacturing, it is often necessary to use negative pressure pneumatics to transport metal powders. Most of the negative pressure pneumatic conveying systems currently used in the market are dense phase conveying. In the process of powder delivery (conveying metal powder), they rely on natural aspiration to replenish air. The powder and gas mixing is uneven, and the negative pressure system (such as the use of a fan) has a small proportion of useful work, high energy consumption, and low conveying efficiency. At the same time, in the process of negative pressure pneumatic conveying, the unstable pipeline pressure (for example, the pipeline is blocked due to the accumulation of metal powder) often causes discontinuous powder delivery, which is intermittent, fast and slow, and has a significant impact on downstream processing equipment and processing technology, affecting the quality of additive manufacturing. Utility Model Content

[0003] In order to solve the above technical problems existing in the background technology, the utility model provides a continuous powder feeding device which can avoid the blockage of the conveying pipeline, stabilize the pipeline pressure and has high powder feeding efficiency.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A continuous powder feeding device comprises a powder storage barrel, a vacuum powder feeding pipe air inlet pipe, a vacuum powder feeding pipe and a negative pressure generating device, wherein the vacuum powder feeding pipe air inlet pipe is connected with the vacuum powder feeding pipe; the powder storage barrel is connected with the negative pressure generating device through the vacuum powder feeding pipe; the characteristic is that the continuous powder feeding device also comprises a strong powder feeding pipe connected with the vacuum powder feeding pipe.

[0006] The powerful powder delivery pipe is coaxial with the vacuum powder delivery pipe; the vacuum powder delivery pipe is connected with the negative pressure generating device through the powerful powder delivery pipe.

[0007] The above-mentioned powerful powder feeding pipe is provided with a powerful powder feeding air inlet pipe, and the pressure entering the powerful powder feeding pipe through the powerful powder feeding air inlet pipe is not greater than the pressure generated by the negative pressure generating device.

[0008] The above-mentioned continuous powder feeding device also includes a non-return device arranged between the vacuum powder feeding pipe and the strong powder feeding pipe.

[0009] The non-return device is provided with a non-return device air inlet pipe which is communicated with the non-return device.

[0010] The pressure and air flow rate at the inlet end of the air inlet pipe of the vacuum powder feeding pipe are both adjustable.

[0011] The negative pressure value of the negative pressure generating device is adjustable.

[0012] The above-mentioned continuous powder feeding device also includes a vacuum pressure gauge which is connected with the vacuum powder feeding pipe.

[0013] The advantages of the utility model are:

[0014] The utility model provides a continuous powder feeding device, including a powder storage barrel, a vacuum powder feeding pipe air inlet pipe, a vacuum powder feeding pipe and a negative pressure generating device, wherein the vacuum powder feeding pipe air inlet pipe is connected with the vacuum powder feeding pipe; the powder storage barrel is connected with the negative pressure generating device through the vacuum powder feeding pipe; in addition, the continuous powder feeding device provided by the utility model also includes a strong powder feeding pipe connected with the vacuum powder feeding pipe. The strong powder feeding pipe can be used to strongly impact the powder feeding pipeline between the vacuum powder feeding pipe and the negative pressure generating device, so that the powder feeding pipeline will not be blocked due to the accumulation of metal powder, that is, the strong powder feeding pipe has the function of clearing the pipeline; at the same time, the utility model is provided with a check device to prevent the powder storage barrel from being pressurized due to excessive pipeline pressure during the purge process. In addition, the utility model is provided with a flow and pressure regulating device in the air supply system, and the controllable adjustment of the powder feeding efficiency can be achieved through the matching adjustment of the pressure and flow in the entire pipeline, so that the entire powder feeding process becomes accurate and controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the continuous powder feeding device provided by the utility model;

[0016] in:

[0017] 1-powder storage barrel; 2-vacuum pressure gauge; 3-vacuum powder delivery pipe; 4-vacuum powder delivery pipe air inlet pipe; 5-check device; 6-powerful powder delivery pipe; 7-powder delivery pipeline; 8-negative pressure generating device; 9-powerful powder delivery air inlet pipe; 10-check device air inlet pipe. DETAILED DESCRIPTION

[0018] See also Figure 1The present utility model provides a continuous powder feeding device, which is the same as the prior art in that it includes a powder storage barrel 1, a vacuum powder feeding pipe air inlet pipe 4, a vacuum powder feeding pipe 3 and a negative pressure generating device 8, wherein the vacuum powder feeding pipe air inlet pipe 4 is connected to the vacuum powder feeding pipe 3; the powder storage barrel 1 is connected to the negative pressure generating device 8 through the vacuum powder feeding pipe 3; however, different from the prior art, the continuous powder feeding device provided by the present utility model also includes a strong powder feeding pipe 6 connected to the vacuum powder feeding pipe 3. The strong powder feeding pipe 6 can be used to strongly impact the pipeline between the vacuum powder feeding pipe 3 and the negative pressure generating device 8, that is, the powder feeding pipe 7, so that the powder feeding pipe 7 will not be blocked due to the accumulation of metal powder. Exemplarily, the strong powder feeding pipe 6 used in the present utility model is coaxial with the vacuum powder feeding pipe 3; the vacuum powder feeding pipe 3 is connected to the negative pressure generating device 8 through the strong powder feeding pipe 6. The strong powder feeding pipe 6 is provided with a strong powder feeding air inlet pipe 9, and the pressure entering the strong powder feeding pipe 6 through the strong powder feeding air inlet pipe 9 is not greater than the pressure generated by the negative pressure generating device 8. The continuous powder feeding device also includes a vacuum pressure gauge 2 connected to the vacuum powder feeding pipe 3.

[0019] At the same time, in order to prevent the metal powder in the vacuum powder feeding pipe 3 from backflowing when the powerful powder feeding pipe 6 is used, the continuous powder feeding device provided by the utility model also includes a check device 5 arranged between the vacuum powder feeding pipe 3 and the powerful powder feeding pipe 6. For example, the check device can be a pinch valve. The check device 5 is provided with a check device air inlet pipe 10 that is connected to the check device 5.

[0020] The working principle of the utility model is as follows: negative pressure is generated by a negative pressure generating device 8, compressed gas is introduced into the air inlet pipe 10 of the non-return device, the pipeline between the non-return device 5 and the powder storage barrel 1 is isolated, and inert gas is introduced into the strong powder feeding air inlet pipe 9 to purge the entire pipeline, and the residual powder therein (or accumulated on the inner wall of the powder feeding pipeline 7) is blown away to prevent the pipeline pressure from being too high during the formal powder feeding process; after the purge is completed, the gas path in the non-return device 5 is disconnected, and the entire pipeline is unblocked. At this time, inert gas begins to be introduced into the air inlet pipe 4 of the vacuum powder feeding pipe, and pipeline powder feeding begins.

[0021] The pressure at the inlet end of the vacuum powder delivery pipe inlet pipe 4 and the air intake flow rate are both adjustable. Preferably, the pressure of the negative pressure generating device 8 is also adjustable. By adjusting the negative pressure value generated by the negative pressure generating device 8 and the air intake flow rate and pressure of the vacuum powder delivery pipe inlet pipe 4, the flow rate in the entire powder delivery pipeline can reach a fixed value, at which time the powder can be transported at a uniform and stable speed. By different matching values, different conveying speeds of the material can be achieved, and the speed can be adjusted.

Claims

1. A continuous powder feeding device, comprising a powder storage bucket (1), a vacuum powder feeding pipe air inlet pipe (4), a vacuum powder feeding pipe (3) and a negative pressure generating device (8), wherein the vacuum powder feeding pipe air inlet pipe (4) is connected to the vacuum powder feeding pipe (3); the powder storage bucket (1) is connected to the negative pressure generating device (8) through the vacuum powder feeding pipe (3); characterized in that: The continuous powder feeding device also includes a strong powder feeding pipe (6) which is connected to the vacuum powder feeding pipe (3).

2. The continuous powder feeding device according to claim 1, characterized in that: The powerful powder delivery pipe (6) is coaxial with the vacuum powder delivery pipe (3); the vacuum powder delivery pipe (3) is connected to the negative pressure generating device (8) through the powerful powder delivery pipe (6).

3. The continuous powder feeding device according to claim 2, characterized in that: The powerful powder delivery pipe (6) is provided with a powerful powder delivery air inlet pipe (9), and the pressure entering the powerful powder delivery pipe (6) through the powerful powder delivery air inlet pipe (9) is not greater than the pressure generated by the negative pressure generating device (8).

4. The continuous powder feeding device according to claim 3 is characterized in that: The continuous powder feeding device further comprises a non-return device (5) arranged between the vacuum powder feeding pipe (3) and the strong powder feeding pipe (6).

5. The continuous powder feeding device according to claim 4, characterized in that: The non-return device (5) is provided with a non-return device air inlet pipe (10) which is in communication with the non-return device (5).

6. The continuous powder feeding device according to any one of claims 1 to 5, characterized in that: The pressure and air intake flow rate at the inlet end of the vacuum powder delivery pipe air intake pipe (4) are both adjustable.

7. The continuous powder feeding device according to claim 6, characterized in that: The negative pressure value of the negative pressure generating device (8) is adjustable.

8. The continuous powder feeding device according to claim 7, characterized in that: The continuous powder feeding device also includes a vacuum pressure gauge (2) which is in communication with the vacuum powder feeding pipe (3).

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