CN107303606A - A kind of powder feeding formula laser 3D printing carrier gas type powder feeder - Google Patents

Abstract

The invention belongs to the technical field of powder-feeding laser 3D printing, and specifically relates to a powder-feeding laser 3D printing air-carrying powder feeder. It includes stirring motor, powder feeding barrel, agitator, powder pan, powder suction device, powder pan airtight cavity and rotating motor, wherein the powder pan is rotatably set in the powder pan airtight cavity, and is connected with the rotating machine located below the powder pan airtight cavity. The output shaft of the motor is connected, the powder tray is provided with an annular groove, and the sealed cavity of the powder tray is provided with a powder suction port and a powder drop port corresponding to the annular groove, the powder suction device and The powder feeding barrel is respectively arranged on the powder suction port and the powder dropping port, and the agitator is arranged in the powder feeding barrel and is connected with the output shaft of the stirring motor arranged outside the powder feeding barrel. The invention has stable conveying efficiency and is suitable for conveying low fluidity and ultrafine powder.

Description

A powder feeding type laser 3D printing carrier air powder feeder

technical field

The invention belongs to the technical field of powder-feeding laser 3D printing, and specifically relates to a powder-feeding laser 3D printing air-carrying powder feeder.

technical background

3D printing technology, also known as Additive Manufacturing (AM) technology, is a multidisciplinary process involving physics, chemistry, materials science and engineering, computer science and technology, control science and engineering, mechanical engineering, biomedicine and engineering. Cutting-edge advanced manufacturing technology in cross-fields. Powder-feeding laser 3D printing technology is a new advanced manufacturing technology developed by combining rapid prototyping technology and synchronous feeding laser cladding technology. It uses high-energy laser beams to locally melt the metal surface to form a molten pool, and simultaneously Raw materials are sent into the molten pool synchronously to form a new metal layer that is metallurgically combined with the base metal and has a very low dilution rate. , Layer by layer cladding to accumulate functional three-dimensional metal solid parts of any shape or near-shaped parts that only require a small amount of finishing.

3D printing technology has a very broad application prospect, and is hailed as one of the carriers of the third industrial revolution by developed countries in Europe and the United States, which will drive disruptive changes in many fields such as industrial production, new materials, and lean manufacturing. How to improve the efficiency, accuracy and stability of powder feeding is the bottleneck problem faced by the current powder feeding laser 3D printing technology. At present, the commonly used powder feeders mainly have the following forms: screw type, scraper type, drum type and fluidized type. Among them, the scraper type powder feeding principle is simple, the structure is stable, and the application range is relatively wide. However, the current scraper-type powder feeder requires the powder to have good spherical shape and fluidity, and it is difficult to transport ultra-fine powder (above 325 mesh).

Contents of the invention

In view of the above problems, the object of the present invention is to provide a powder feeding type laser 3D printing carrier air powder feeder. The powder feeder solves the problems of low powder delivery efficiency and inability to deliver low fluidity and ultrafine powders in the current laser 3D printing powder feeder.

In order to achieve the above object, the present invention adopts the following technical solutions:

A powder-feeding laser 3D printing air-carrying powder feeder, including a stirring motor, a powder feeding barrel, a stirrer, a powder pan, a powder suction device, a powder pan airtight cavity and a rotating motor, wherein the powder pan is rotatably arranged on the powder In the airtight chamber of the powder disk, and connected with the output shaft of the rotating motor located below the airtight chamber of the powder disk, the powder disk is provided with an annular groove, and the airtight chamber of the powder disk is provided with a groove corresponding to the ring groove. The powder suction port and the powder drop port, the powder suction device and the powder feeding barrel are respectively arranged on the powder suction port and the powder drop port, the agitator is arranged in the powder feeding barrel, and is arranged outside the powder feeding barrel The output shaft of the stirring motor is connected.

The powder feeding barrel is a closed cavity, and the lower end of the closed cavity is a conical structure that facilitates the powder to fall smoothly. The bottom of the conical structure is provided with a powder outlet.

The powder feeding barrel is further connected with the powder storage barrel, and the connection between the powder storage barrel and the vacuum device is provided with a filtering device to prevent the powder in the powder storage barrel from being sucked away.

The lower end of the powder feeding bucket is connected to the powder feeding port on the sealed cavity of the powder pan through the powder dropping block, and the powder suction device is connected to the powder sucking port on the sealed cavity of the powder pan through the powder sucking block.

The powder falling block and the powder absorbing block have the same structure, and both of them are provided with a concave hole on the upper part to cooperate with the powder absorbing device or the powder feeding barrel, and a convex hole on the lower part to cooperate with the annular groove on the powder plate. introduced.

The powder feeding barrel is detachably connected to the conical structure at the bottom.

The powder suction port and the powder drop port on the airtight cavity of the powder pan are arranged symmetrically.

Air pressure balance ports are provided on the powder feeding barrel and the closed cavity of the powder pan, and the two air pressure balance ports are connected through a ventilation pipe.

The powder suction device is a powder suction nozzle, and the agitator is a multi-section rod structure.

The powder feeding bucket is made of plexiglass.

Advantage of the present invention and beneficial effect are:

1. The present invention proposes a powder-feeding laser 3D printing air-carrying powder feeder, which has stable conveying efficiency and is suitable for low fluidity and ultra-fine powder conveying. The whole set of equipment has the advantages of low powder feeding rate, high powder feeding accuracy and stability; it can carry out mixed transportation of single metal powder or multiple powders; it can carry out long-distance transportation; the powder supply process is uninterrupted forming processing and other advantages.

2. The stirrer in the present invention uses an external stirring motor and uses a multi-section rod stirring structure to break up the powder agglomeration, so that the low-fluidity powder can be smoothly conveyed, and the powder conveying efficiency is improved.

3. In the present invention, the bottom of the powder feeding barrel adopts a conical design, which facilitates the smooth falling of powder.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of powder falling block of the present invention;

Fig. 3 is a sectional view of A-A in Fig. 2 .

Among them, 1 is the stirring motor, 2 is the powder feeding barrel, 3 is the agitator, 4 is the powder plate, 5 is the powder falling block, 51 is the protruding platform, 52 is the hollow space, 53 is the concave hole, 6 is the powder suction block, 7 is an air pressure balance port, 8 is a powder suction device, 9 is a closed cavity of a powder pan, and 10 is a rotating motor.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of the present invention. As shown in Figure 1, a powder-feeding laser 3D printing air-carrying powder feeder provided by the present invention includes a stirring motor 1, a powder feeding barrel 2, an agitator 3, a powder plate 4, a powder suction device 8, and a powder plate The closed chamber 9 and the rotating motor 10, wherein the powder disc 4 is rotatably arranged in the closed chamber 9 of the powder disc, and the powder disc 4 is connected with the output shaft of the rotating motor 10 located below the closed chamber 9 of the powder disc through a coupling. The powder pan 4 is provided with an annular groove, and the powder pan airtight cavity 9 is provided with a powder suction port and a powder drop port corresponding to the annular groove, and the powder suction device 8 and the powder feeding barrel 2 are respectively arranged on the powder suction port and the powder drop port, and the agitator 3 is arranged in the powder feeding barrel 2 and connected with the output shaft of the stirring motor 1 arranged outside the powder feeding barrel 2 .

The powder feeding barrel 2 is an airtight cavity, and the lower end of the airtight cavity is a conical structure that facilitates the powder to fall smoothly. The bottom of the conical structure is provided with a powder outlet. The powder feeding barrel 2 is detachably connected to the conical structure at the bottom.

The powder feeding barrel 2 is further connected with the powder storage barrel, and the connection between the powder storage barrel and the vacuum device is provided with a filter device to prevent the powder in the powder storage barrel from being sucked away. The filter device adopts Conventional mesh structure. The powder delivery barrel 2 adopts a fully sealed design, and a powder transfer channel is set between the powder storage barrel, so that powder materials can be added to the powder delivery barrel 2 at any time under anaerobic conditions. The powder storage barrel maintains an oxygen-free environment in the powder storage barrel by first vacuuming and then replenishing argon, and realizes adding powder to the powder feeding barrel 2 online through the powder delivery channel. By setting the powder storage barrel, automatic powder supply during processing can be realized.

The powder storage barrel is sealed with a sealing ring. After the powder is added to the powder storage barrel, the air brought in during powder addition is sucked out by a vacuum pump. In order to prevent the powder from being sucked away, a special filter device is equipped at the connection between the powder storage barrel and the vacuum pump. In order to balance the air pressure of the powder storage barrel and the powder delivery barrel 2, so that the powder flows down smoothly, the air in the powder storage barrel is drained and filled with argon. In the present embodiment, the diameter of the powder storage barrel is 100 mm, and the height of the barrel is 300 mm.

For the convenience of observing the amount of powder in the powder feeding barrel 2, the powder feeding barrel 2 is made of plexiglass. In this embodiment, the barrel diameter of the powder feeding barrel 2 is 100mm, and the barrel height is 300mm.

The lower end of the powder feeding bucket 2 is connected to the powder feeding port on the closed cavity 9 of the powder pan through the powder falling block 5, and the powder suction device 8 is connected to the suction port on the closed cavity 9 of the powder pan through the powder suction block 6. Powder connection.

As shown in Figure 2 and Figure 3, the upper part of the powder falling block 5 is provided with a concave hole 53 that is connected with the powder suction device 8 or the powder feeding bucket 2, and the lower part is provided with an annular ring that is connected with the powder plate 4. The protruding table 51 is matched with the groove, and the middle part of the powder falling block 5 is provided with a hollow space 52 .

In order to avoid the eccentric rotation of the powder plate 4 caused by the pressing force of the powder falling block 5 and the powder absorbing block 6 on the powder plate 4, the powder suction port and the powder falling port on the sealed cavity 9 of the powder plate are arranged symmetrically so that the powder falling The blocks 5 and the powder suction blocks 6 are symmetrically distributed on the powder pan 4, so that the force on the powder pan 4 is uniform, and the stability and smoothness of rotation are improved.

The air pressure balance port 7 is provided on the powder feeding barrel 2 and the powder pan airtight cavity 9, and the two air pressure balance ports 7 are connected by a ventilation pipe, which balances the pressure in the powder feeding barrel 2 and the powder pan airtight cavity, In order to facilitate the continuous and stable falling of powder. At the same time, the air pressure balance air pipe also plays a role in preventing the negative pressure difference between the powder feeding barrel 2 and the closed cavity of the powder pan to reduce the flow of powder or prevent the powder from falling.

The powder suction device 8 is a powder suction nozzle, the function of the powder suction nozzle is to stably suck out the powder, and through effective cooperation with the powder suction block 6, the powder in the annular groove of the powder pan 4 is smoothly sucked out.

The agitator 3 is a multi-section rod structure, and the agitator 3 is used to prevent powder agglomeration and ensure the stability and precision of powder feeding. Ultra-fine powder and low fluidity powder are prone to agglomeration and bridging, and it is difficult to ensure that the powder falls into the annular groove evenly and continuously, so the commonly used powder feeder is often unable to transport this type of powder. This invention solves this problem by designing the agitator One problem, the mixer uses an external stirring motor and uses a multi-section rod stirring structure to break up the powder agglomeration, so that those low-fluidity powders can be smoothly conveyed, and the powder conveying efficiency is improved.

The powder disc 4 is a powder transfer device, and the depth of the annular groove on the powder disc 4 is one of the important determinants of the powder feeding amount. The powder falls into the annular groove by the powder feeding barrel 2 under its own gravity, and the powder is fed by The powder feeding barrel 2 falls into the annular groove, and the powder plate 4 is driven by the rotating motor 10 (precision DC motor) to transfer the fallen powder from the powder drop port to the powder discharge port. The powder plate 4 is made of 45# steel, and the surface needs to be treated with anti-oxidation.

The concave hole 53 on the top of the powder dropping block 5 is connected with the powder outlet at the bottom of the powder feeding barrel 2 , and the protruding platform 51 at the bottom is in contact with the annular groove of the powder tray 4 . The inner and outer circular arcs of the protruding platform 51 are in contact with the inner and outer circles of the annular groove of the powder tray 4 respectively to play a guiding role. The inner and outer arcs are hollow, and the powder falls into the limited volume space in the annular groove through the powder falling block 5 from the powder falling port. The structure of the powder suction block 6 is similar to that of the powder falling block 5 .

The present invention has the advantages of low powder feeding rate, high powder feeding accuracy and stability; it can carry out mixed transportation of single metal powder or multiple powders;

The above description is only an implementation manner of the present invention, and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims (10)

1. a kind of powder feeding formula laser 3D printing carrier gas type powder feeder, it is characterised in that including stirring motor (1), powder feeding bucket (2), Agitator (3), powder disk (4), device for inhaling powdery substances (8), powder disk closed chamber (9) and electric rotating machine (10), wherein powder disk (4) are rotationally It is arranged in powder disk closed chamber (9) and is connected with the output shaft of the electric rotating machine (10) below powder disk closed chamber (9), institute Powder disk (4) is stated provided with annular groove, the powder disk closed chamber (9) is provided with suction powder mouthful corresponding with the annular groove With powder falling mouthful, the device for inhaling powdery substances (8) and powder feeding bucket (2) are respectively arranged in the suction powder mouthful and powder falling mouthful, the agitator (3) it is arranged in powder feeding bucket (2) and the output shaft of the stirring motor (1) outside with being arranged at powder feeding bucket (2) is connected.

2. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 1, it is characterised in that the powder feeding bucket (2) it is airtight cavity, the pyramidal structure that the lower end of the airtight cavity smoothly falls for ease of powder, the bottom of the pyramidal structure Provided with meal outlet.

3. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 2, it is characterised in that the powder feeding bucket (2) further it is connected with power collecting bucket, the connection of the power collecting bucket and vacuum extractor and junction are provided with preventing the storage powder The filter that powder in bucket is pumped.

4. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 2, it is characterised in that the powder feeding bucket (2) lower end is connected by powder falling block (5) with the powder feeding mouthful on the powder disk closed chamber (9), and the device for inhaling powdery substances (8) is by inhaling Powder agglomates (6) is connected with the suction powder mouthful on the powder disk closed chamber (9).

5. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 4, it is characterised in that the powder falling block (5) with inhale powder agglomates (6) structure it is identical, be top be provided with the device for inhaling powdery substances (8) or powder feeding bucket (2) be connected it is recessed Hole, bottom is provided with coordinates the protrusion platform contacted with the annular groove on the powder disk (4).

6. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 2, it is characterised in that the powder feeding bucket (2) it is to be detachably connected with the pyramidal structure of bottom.

7. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 1, it is characterised in that the powder disk is close Suction powder mouthful and powder falling mouthful in closed chamber (9) are symmetrical arranged.

8. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 1, it is characterised in that the powder feeding bucket (2) air pressure balance mouthful (7) and in powder disk closed chamber (9) is equipped with, two air pressure balances mouthful (7) are connected by breather pipe.

9. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 1, it is characterised in that the suction powder dress (8) are put for starch sucking nozzle, the agitator (3) is Multi section bar structure.

10. the powder feeding formula laser 3D printing carrier gas type powder feeder according to claims 1, it is characterised in that the powder feeding Bucket (2) is made of lucite.