CN212194221U - A new type of 3D printing nozzle with linear focus - Google Patents

Abstract

The utility model discloses a novel 3D printing nozzle with linear focusing, which comprises a nozzle body, a powder feeding pipe and an aerodynamic lens; the top of the spray head body is provided with a laser inlet, the bottom of the spray head body is provided with a spray head outlet, the top of the spray head body is provided with a buffer cavity, the buffer cavity is communicated with the laser inlet, and the bottom of the buffer cavity is provided with a laser outlet; the aerodynamic lens is located the shower nozzle originally internally, the top and the cushion chamber of aerodynamic lens are connected, the bottom and the bottom of shower nozzle body of aerodynamic lens are connected, aerodynamic lens respectively with laser outlet and shower nozzle export intercommunication, aerodynamic lens is including a plurality of lens cavitys that from top to bottom set up, the bottom of every lens cavity is equipped with the penetration hole, laser inlet, laser outlet, penetration hole and shower nozzle export are located same straight line, send the powder pipe to pass shower nozzle body and aerodynamic lens intercommunication, adjust the high position of shower nozzle body and machined part when being convenient for 3D prints.

Description

A new type of 3D printing nozzle with linear focus

technical field

The utility model relates to the technical field of 3D printing equipment, in particular to a novel 3D printing nozzle with linear focusing.

Background technique

3D printing is a cumulative manufacturing technology, that is, a rapid prototyping machine, which makes three-dimensional objects by comparing digital model files, printing layers of adhesive materials such as metal powder or plastic, and printing layers of adhesive materials. At this stage, some 3D printers spray the powder on the workpiece through the powder feeding nozzle, and then melt the powder through laser heating to manufacture the required products. The powder feeding channel is focused on a point, which is exactly at the position where the workpiece needs to be processed, and then is melted in contact with the laser, so the problem is that the distance between the powder feeding nozzle and the workpiece is fixed and cannot be easily adjusted. , which complicates the process.

At the same time, the existing 3D printer nozzles are prone to clogging and broken raw materials. The reason is that the heat dissipation is insufficient. The existing printer nozzles have insufficient heat dissipation, and the space inside the nozzles is dense, which cannot effectively dissipate heat.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a new type of 3D printing nozzle with linear focus, which solves the problem that the distance between the powder feeding nozzle and the workpiece is fixed and cannot be adjusted conveniently.

The technical scheme of the utility model is as follows: a new type of 3D printing nozzle with linear focus, comprising a nozzle body, a powder feeding tube and an aerodynamic lens; the top of the nozzle body is provided with a laser inlet, the bottom of the nozzle body is provided with a nozzle outlet, and the nozzle The top of the body is provided with a buffer cavity, the buffer cavity is connected with the laser inlet, and the bottom of the buffer cavity is provided with a laser outlet; the aerodynamic lens is located in the nozzle body, the top of the aerodynamic lens is connected with the buffer cavity, and the aerodynamic lens The bottom is connected with the bottom of the nozzle body, the aerodynamic lens is connected with the laser outlet and the nozzle outlet respectively, the aerodynamic lens includes a plurality of lens cavities arranged from top to bottom, and the bottom of each lens cavity is provided with a penetration hole , the laser inlet, the laser outlet, the penetrating hole and the nozzle outlet are located on the same straight line, and the powder feeding pipe passes through the nozzle body and communicates with the aerodynamic lens. By arranging the aerodynamic lens and the powder feeding tube together in the nozzle body, the laser and the powder to be processed are in the same line, which facilitates the adjustment of the height position of the nozzle body and the workpiece during 3D printing, and improves the powder feeding accuracy.

Further, the volumes of the plurality of lens cavities gradually decrease from top to bottom, and the diameters of the plurality of penetration holes gradually decrease from top to bottom. The pressure difference from top to bottom is formed in the plurality of lens cavities, so that the powder carried by the gas is ejected from the nozzle body from top to bottom, and the powder is gradually focused on a straight line in the process.

Further, the powder feeding tube is arranged obliquely, and one end of the center line of the powder feeding tube points to the penetration hole. The powder in the powder feeding tube can directly enter the penetration hole, so that the powder is linearly gathered in the aerodynamic lens, and a precise particle beam is formed through the aerodynamic lens.

Further, the bottoms of the plurality of lens cavities are inclined, the penetration holes are located in the center of the bottoms, and the bottoms of the lens cavities are inclined toward the penetration holes. By arranging the bottom of the lens cavity to be inclined toward the penetrating hole, dust can be avoided in each lens cavity.

Further, the new type of linear focusing 3D printing nozzle further includes a sealing glass, which is installed at the laser outlet to seal the gap between the buffer cavity and the aerodynamic lens. The sealing glass is used to insulate the powder while not obstructing the passage of the laser light.

Further, the new type of linear focusing 3D printing nozzle further includes a plurality of cooling fins, the inner wall of the nozzle body is provided with a cooling cavity, the cooling cavity is provided with a cooling liquid inlet and a cooling liquid outlet, and the cooling cavity is filled with cooling liquid. One end of the heat sink is in contact with the aerodynamic lens, and the other end is in contact with the cooling cavity. By setting the heat sink, the aerodynamic lens is assisted to dissipate heat, and at the same time, the heat sink conducts the heat to the cooling cavity, which further enhances the heat dissipation effect and prevents the temperature of the nozzle body from being too high.

Further, the cooling liquid inlet and the cooling liquid outlet are respectively arranged on the side walls of the nozzle body, the cooling liquid inlet is connected with the water inlet pipe, and the cooling liquid outlet is connected with the water outlet pipe. The cooling cavity and the external cooling liquid form a closed loop, absorb the heat absorbed by the heat sink from the aerodynamic lens, and bring out the nozzle body, which has the effect of cooling in time.

Further, the powder feeding tube is connected to an external powder feeding machine, an external laser is provided at the laser inlet, and the laser is injected from the laser inlet.

The working principle of the above-mentioned linear focusing new 3D printing nozzle is that the external laser is installed at the laser inlet. The laser passes through the laser inlet, runs through the entire aerodynamic lens, and exits from the nozzle outlet. The powder feeding tube passes through the inclined angle and the aerodynamic lens. Connected, the powder is fed into the aerodynamic lens, the powder is linearly gathered in the aerodynamic lens, and a precise particle beam is formed through the aerodynamic lens, while the gas is in the aerodynamic lens from top to bottom. The pressure difference is formed in the cavity, so that the gas carries the powder out of the nozzle body from top to bottom, and the laser and the particle beam are on the same line, which is convenient for adjusting the height position of the nozzle and the workpiece during 3D printing, and the cooling liquid is stored in the cooling cavity. Through the cooling liquid inlet and cooling liquid outlet, it forms a closed-loop circuit with the external cooling liquid, absorbs the heat absorbed by the heat sink from the aerodynamic lens, and brings out the nozzle body, which has the effect of cooling in time.

Compared with the prior art, the utility model has the following beneficial effects:

The new 3D printing nozzle with linear focusing of the utility model is arranged in the nozzle body together with the aerodynamic lens and the powder feeding tube, so that the laser and the powder to be processed are in the same straight line, which is convenient for adjusting the nozzle body and processing during 3D printing. The height position of the piece is improved, and the powder feeding accuracy is improved.

The novel 3D printing nozzle with linear focusing of the utility model is provided with a cooling cavity and a cooling fin, the cooling cavity and the external cooling liquid form a closed loop, absorb the heat absorbed by the cooling fin from the aerodynamic lens, and bring out the nozzle body, It has the effect of cooling in time.

Description of drawings

FIG. 1 is a schematic structural diagram of a new type of linear focusing 3D printing nozzle of the present invention.

FIG. 2 is a cross-sectional view of the new 3D printing nozzle with linear focus of the present invention.

3 is a cross-sectional view of a new type of 3D printing nozzle with linear focus in Embodiment 2 of the present invention.

FIG. 4 is a cross-sectional view of another new linearly focused 3D printing nozzle in Embodiment 2 of the present invention.

FIG. 5 is a schematic diagram of the linear focusing of powder in the new linear focusing 3D printing nozzle of the present invention.

Nozzle body 1, powder feeding tube 2, aerodynamic lens 3, sealing glass 4, heat sink 5, laser inlet 6, nozzle outlet 7, buffer cavity 8, laser outlet 9, lens cavity 10, penetration hole 11, cooling Cavity 12 , cooling liquid inlet 13 , cooling liquid outlet 14 .

Detailed ways

The present utility model will be further described in detail below with reference to the examples, but the embodiments of the present utility model are not limited thereto.

Example 1

As shown in FIG. 1 and FIG. 2 , this embodiment provides a new type of 3D printing nozzle with linear focus, including a nozzle body 1 , a powder feeding tube 2 , an aerodynamic lens 3 , a sealing glass 4 and a heat sink 5 .

As shown in Figures 1 and 2, the nozzle body is in the shape of a pen head, the top of the nozzle body is provided with a laser inlet 6, the bottom of the nozzle body is provided with a nozzle outlet 7, and the top of the nozzle body is provided with a buffer cavity 8, the buffer cavity and the laser The inlet is connected, the bottom of the buffer cavity is provided with a laser outlet 9, an external laser is arranged at the laser inlet, and the laser is injected from the laser inlet.

As shown in Figure 1 and Figure 2, the aerodynamic lens is located in the nozzle body, the top of the aerodynamic lens is connected to the buffer cavity, and the sealing glass is installed at the laser outlet to seal the gap between the buffer cavity and the aerodynamic lens, The sealing glass is used to isolate the powder and not hinder the passage of the laser light; the bottom of the aerodynamic lens is connected with the bottom of the nozzle body, and the aerodynamic lens is connected with the laser outlet and the nozzle outlet respectively. A plurality of lens cavities 10, each lens cavity is provided with a penetration hole 11 at the bottom, the laser inlet, the laser outlet, the penetration hole and the nozzle outlet are located on the same straight line, and the volume of the plurality of lens cavities gradually increases from top to bottom. The diameter of the plurality of penetrating holes gradually decreases from top to bottom, so that the pressure difference from top to bottom is formed in the plurality of lens cavities, so that the powder carried by the gas is ejected from the nozzle body from top to bottom.

As shown in Figures 1 and 2, the inner wall of the nozzle body is provided with a cooling cavity 12, the cooling cavity is provided with a cooling liquid inlet 13 and a cooling liquid outlet 14, the cooling liquid is filled in the cooling cavity, and the cooling liquid inlet and the cooling liquid outlet are respectively provided in On the side wall of the nozzle body, the cooling liquid inlet is connected to the water inlet pipe, the cooling liquid outlet is connected to the water outlet pipe, one end of the plurality of radiating fins abuts against the aerodynamic lens, and the other end abuts the cooling cavity. The radiating fins are made of good thermal conductivity. It is made of metal material. The cooling fins are arranged to assist the aerodynamic lens to dissipate heat. At the same time, the cooling fins conduct heat to the cooling cavity. The heat is brought out of the nozzle body, which has the effect of cooling in time.

The working principle of the above-mentioned linear focusing new 3D printing nozzle is that the external laser is installed at the laser inlet. The laser passes through the laser inlet, runs through the entire aerodynamic lens, and exits from the nozzle outlet. The powder feeding tube passes through the inclined angle and the aerodynamic lens. Connected, the powder is fed into the aerodynamic lens, the powder is linearly gathered in the aerodynamic lens, and a precise particle beam is formed through the aerodynamic lens, while the gas is in the aerodynamic lens from top to bottom. The pressure difference is formed in the cavity, so that the gas carries the powder out of the nozzle body from top to bottom, and the laser and the particle beam are on the same line, which is convenient for adjusting the height position of the nozzle and the workpiece during 3D printing, and the cooling liquid is stored in the cooling cavity. Through the cooling liquid inlet and cooling liquid outlet, it forms a closed-loop circuit with the external cooling liquid, absorbs the heat absorbed by the heat sink from the aerodynamic lens, and brings out the nozzle body, which has the effect of cooling in time.

As shown in Figure 5, the above-mentioned principle of linear focusing of powder in the new 3D printing nozzle with linear focusing, the two adjacent lens chambers in the aerodynamic lens, the pressure on one side of the penetrating hole is P, and the pressure on the other side is P. P', P>P', when the air flow carries the powder particles through the penetration hole driven by the pressure difference between the upper and lower lens chambers, due to the drag force of the high-speed air flow, the powder particles will approach the axis and pass through the penetration hole, and then due to the gas The speed of radial diffusion is small, and the powder particles near the axis are also subjected to a small radial force, the powder particles will remain near the axis, and the airflow will spread to the entire lens cavity, so that the powder particles are separated from the original airflow and Aggregated near the axis, the fundamental reason for the linear focusing of powder particles is the difference in inertia between particles and gas molecules.

Example 2

As shown in FIG. 3 and FIG. 4 , the difference between this embodiment and Embodiment 1 is that the bottoms of the plurality of lens cavities are inclined, the penetrating holes are located in the center of the bottoms, and the bottoms of the lens cavities are inclined toward the penetrating holes. . By arranging the bottom of the lens cavity to be inclined toward the penetrating hole, dust can be avoided in each lens cavity.

As mentioned above, the present utility model can be better realized, and the above-mentioned embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of implementation of the present utility model; and modifications are all covered by the scope of protection required by the claims of the present invention.

Claims (8)

1. A novel 3D printing nozzle with linear focusing is characterized by comprising a nozzle body, a powder feeding pipe and an aerodynamic lens;

the top of the spray head body is provided with a laser inlet, the bottom of the spray head body is provided with a spray head outlet, the top of the spray head body is provided with a buffer cavity, the buffer cavity is communicated with the laser inlet, and the bottom of the buffer cavity is provided with a laser outlet;

the aerodynamic lens is located the shower nozzle body, the top and the buffer chamber of aerodynamic lens are connected, the bottom and the bottom of shower nozzle body of aerodynamic lens are connected, aerodynamic lens respectively with laser outlet and shower nozzle export intercommunication, aerodynamic lens is including a plurality of lens cavitys that set up from top to bottom, the bottom of every lens cavity is equipped with the penetration hole, laser inlet, laser outlet, penetration hole and shower nozzle export are located same straight line, send the powder pipe to pass shower nozzle body and aerodynamic lens intercommunication.

2. The linearly focusing novel 3D printing nozzle as claimed in claim 1, wherein the volume of the lens cavities is gradually reduced from top to bottom, and the diameter of the penetrating holes is gradually reduced from top to bottom.

3. The novel linear focusing 3D printing nozzle as claimed in claim 1, wherein the powder feeding pipe is arranged obliquely, and one end of the center line of the powder feeding pipe points to the penetrating hole.

4. The novel linear focusing 3D printing nozzle as claimed in claim 1, wherein the bottoms of the plurality of lens cavities are inclined, the penetrating hole is located at the center of the bottom, and the bottom of the lens cavity is inclined towards the penetrating hole.

5. The novel linear focusing 3D printing nozzle as claimed in claim 1, further comprising a sealing glass, wherein the sealing glass is installed at the laser outlet to seal the gap between the buffer chamber and the aerodynamic lens.

6. The novel linear focusing 3D printing nozzle as claimed in claim 1, further comprising a plurality of cooling fins, wherein the inner wall of the nozzle body is provided with a cooling cavity, the cooling cavity is provided with a cooling liquid inlet and a cooling liquid outlet, the cooling cavity is filled with cooling liquid, and one end of each of the plurality of cooling fins abuts against the aerodynamic lens and the other end of each of the plurality of cooling fins abuts against the cooling cavity.

7. The novel linear focusing 3D printing nozzle as claimed in claim 6, wherein the cooling liquid inlet and the cooling liquid outlet are respectively disposed on the side wall of the nozzle body, the cooling liquid inlet is connected to a water inlet pipe, and the cooling liquid outlet is connected to a water outlet pipe.

8. The novel linear focusing 3D printing nozzle as claimed in claim 1, wherein the powder feeding pipe is connected to an external powder feeder, an external laser is provided at the laser inlet, and the laser is emitted from the laser inlet.

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