CN110328365B

CN110328365B - 3D printing device and powder conveying mechanism thereof

Info

Publication number: CN110328365B
Application number: CN201910616210.6A
Authority: CN
Inventors: 汪丰林; 丁笑; 李敬; 李华城; 袁晓波; 李军旗
Original assignee: Shenzhen Jingjiang Yunchuang Technology Co Ltd
Current assignee: Shenzhen Fulian Jingjiang Technology Co ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2021-05-28
Anticipated expiration: 2039-07-09
Also published as: CN110328365A

Abstract

The invention provides a 3D printing device which comprises a main body and a powder conveying mechanism, wherein the main body comprises a shell, a forming cavity is formed by the shell in a surrounding mode, the powder conveying mechanism comprises a roller, a powder conveying pipe and a rotary driving piece, the roller comprises an outer barrel and an inner barrel, the outer barrel is arranged above the shell, the inner barrel is rotatably arranged in the outer barrel, the content is used for containing powder, the inner barrel is provided with a first opening, the outer barrel is provided with a second opening, the second opening faces the shell, the rotary driving piece is connected with the inner barrel to drive the inner barrel to rotate, the powder flows out from the first opening after the inner barrel rotates, one end of the powder conveying pipe is aligned with the second opening to receive the powder flowing out from the second opening, and the other end of the powder conveying pipe extends into the forming cavity to convey the powder. The invention also provides a powder conveying mechanism.

Description

3D printing device and powder conveying mechanism thereof

Technical Field

The invention relates to metal processing equipment, in particular to a powder conveying mechanism and a 3D printing device with the powder conveying mechanism.

Background

As a novel metal workpiece manufacturing technology, metal 3D printing can realize rapid forming and customized production of products. The selective laser melting technology is a common mode for metal 3D printing at present, and has the characteristics of high precision, high forming density and the like. The powder paving is used as a powder supply mode with the widest application of the selective laser melting technology, the thickness of each layer of powder can be ensured to be consistent with the thickness of the slice, and the sintering quality of each layer of powder is improved.

At present, the powder conveying mechanism of the printing equipment adopts a built-in mode, and the bin door needs to be opened for temporarily adding powder when the powder amount is insufficient in the printing process, so that the printing gas atmosphere is destroyed, and the printing progress is also influenced.

Disclosure of Invention

In view of the above, it is desirable to provide an external powder conveying mechanism to solve the above problems.

The utility model provides a 3D printing device, includes main part and defeated powder mechanism, and the main part includes the casing is around forming the die cavity, defeated powder mechanism includes cylinder, defeated powder pipe and rotary driving piece, the cylinder includes urceolus and inner tube, the urceolus is located the casing top, the inner tube is rotationally located in the urceolus, the inner tube is used for holding the powder, the inner tube is equipped with first opening, the urceolus is equipped with the second opening, the second opening orientation the casing, rotary driving piece connects the inner tube is in order to drive its rotation, the inner tube rotates the back will the powder by first opening flows, defeated powder pipe one end is aimed at the second opening in order to accept by the powder that the second opening flows, defeated powder pipe other end stretches into in order to carry the powder in the die cavity.

A powder conveying mechanism is used for conveying powder and comprises a roller, a powder conveying pipe and a rotary driving piece, wherein the roller comprises an outer barrel and an inner barrel, the inner barrel is rotatably arranged in the outer barrel and used for containing the powder, the inner barrel is provided with a first opening, the outer barrel is provided with a second opening, the rotary driving piece is connected with the inner barrel to drive the inner barrel to rotate, the powder flows out of the first opening after the inner barrel rotates, one end of the powder conveying pipe is aligned to the second opening to receive the powder flowing out of the second opening, and the powder conveying pipe is used for conveying the powder.

The roller of the powder conveying mechanism of the 3D printing device is arranged above the shell, so that the powder conveying mechanism is convenient to replace, and the problem that the powder is required to be replaced when the powder amount is not enough in the printing process is solved. The powder is conveyed through the powder conveying pipe, the utilization rate of the powder is improved, and the problem that the powder needs to be recycled after printing is completed is solved. The original open powder bin is replaced, the roller can prevent the powder from floating in the air, and the production environment is improved.

Drawings

Fig. 1 is a schematic diagram of a 3D printing apparatus according to an embodiment of the present invention.

Description of the main elements

3D printing device 100

Main body 10

Housing 11

Molding cavity 101

Forming table 12

Scraper 13

Powder conveying mechanism 30

Roller 31

Outer barrel 312

Second opening 3121

Inner barrel 314

First opening 3141

Powder conveying pipe 32

Funnel part 323

Rotary drive 33

Electric control 35

First gate 36

Second gate 37

Air-feeding member 38

Sensor 39

Powder 200

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, a 3D printing apparatus 100 according to a preferred embodiment of the invention includes a main body 10 and a powder conveying mechanism 30. The powder conveying mechanism 30 is disposed above the main body 10, and is configured to convey the powder 200 to the main body 10. The body 10 is used to sinter the powder 200 to form a workpiece.

The main body 10 includes a housing 11, a forming table 12, and a scraper 13. The housing 11 surrounds a forming cavity 101. The forming platform 12 is arranged at the bottom of the forming cavity 101. The scraper 13 is arranged in the forming cavity 101 and above the forming platform 12. The scraper 13 is used to spread the powder 200 over the forming table 12.

The main body 10 may be designed in a manner common in the industry of 3D printing apparatuses, and will not be described in detail herein.

The powder conveying mechanism 30 includes a roller 31, a powder conveying pipe 32 and a rotary driving member 33. The drum 31 is provided above the housing 11 for containing the powder 200. The powder conveying pipe 32 is arranged through the housing 11 and used for conveying the powder 200 in the roller 31 to the forming platform 12. The rotary driving member 33 is disposed on the housing 11 for driving the roller 31 to rotate so as to make the powder 200 flow.

The drum 31 includes an outer cylinder 312 and an inner cylinder 314. The outer cylinder 312 is mounted on the housing 11 via a bracket. The inner cylinder 314 is rollably disposed in the outer cylinder 312. A certain gap exists between the wall of the inner cylinder 314 and the wall of the outer cylinder 312. The inner barrel 314 is used to contain the powder 200. The inner cylinder 314 has a first opening 3141 in its peripheral wall. The peripheral wall of the outer cylinder 312 is provided with a second opening 3121. The rotary driving member 33 is connected to the inner cylinder 314 to drive the inner cylinder 314 to rotate, and the powder 200 flows out from the first opening 3141 after the inner cylinder 314 rotates. The second opening 3121 faces the housing 11 and is aligned with the powder conveying pipe 32. The powder conveying pipe 32 receives the powder 200 flowing out from the second opening 3121 and conveys the powder to the forming cavity 101.

Preferably, the powder conveying mechanism 30 further comprises a gas sending member 38. The duct of the air-sending member 38 extends between the inner cylinder 314 and the outer cylinder 312. The air delivery member 38 is used to introduce hot air between the inner cylinder 314 and the outer cylinder 312 to dry the powder 200.

The rotary driving member 33 drives the inner cylinder 314 to rotate, and as the inner cylinder 314 rotates, the powder 200 flows out of the outer cylinder 312 through the first opening 3141 and flows into the molding cavity 101 through the second opening 3121 and the powder conveying pipe 32.

Preferably, the powder conveying mechanism 30 further includes an electric control member 35, a first gate 36 and a second gate 37. The first shutter 36 is disposed on the inner cylinder 314 and is used for controlling the opening and closing of the first opening 3141. The second shutter 37 is provided on the outer cylinder 312 to control opening and closing of the second opening 3121. The electrical control 35 is electrically connected to the first gate 36 and the second gate 37 respectively to control the on/off thereof.

Preferably, the electrical control 35 is also electrically connected to the air feeding member 38. After the second shutter 37 is closed, the air feeder 38 is controlled to supply hot air to dry the powder 200.

Preferably, the powder conveying mechanism 30 further comprises a sensor 39. The sensor 39 is arranged in the forming cavity 101 for sensing the position of the scraper 13. The electrical control 35 is electrically connected to the sensor 39. When the sensor 39 senses that the scraper 13 is located at the zero position, the electric control 35 controls the second shutter 37 to close and controls the air blowing member 38 to blow air.

One end of the powder conveying pipe 32 is aligned with the second opening 3121, and the other end thereof extends into the forming cavity 101 and is located above the scraper 13.

Preferably, the powder conveying pipe 32 includes a funnel part 323. The funnel portion 323 is located at an end toward the second opening 3121. The funnel 323 is used for receiving the powder 200.

Preferably, the length of the powder conveying pipe 32 is larger than that of the scraper 13 in the direction perpendicular to the moving direction of the scraper 13 in the plane of the forming platform.

When the 3D printing device 100 is in use: the rotary drive 33 rotates the inner barrel 314. As the inner cylinder 314 rotates, the powder 200 in the inner cylinder 314 flows out of the first opening 3141 and enters the forming cavity 101 through the second opening 3121 and along the powder conveying pipe 32 under the action of gravity. The scraper 13 spreads the powder in the molding cavity 101 on the molding platform 12. When the powder 200 needs to be dried, the second gate 37 is closed, the first gate 36 is opened and an appropriate amount of the powder 200 is discharged into the outer cylinder 312, and hot air is introduced into the open air-sending member 38 to dry the powder 200. When it is desired to dry the powder 200 while printing: after the sensor 39 senses that the scraper 13 is at the zero position, the electric control 35 controls the second gate 37 to close and controls the air feeding member 38 to blow air, and after the scraper 13 moves to the working position, the electric control 35 controls the air feeding member 38 to stop blowing air and opens the second gate 37 to release the powder 200.

The roller 31 of the 3D printing device 100 is arranged above the shell 11 and is convenient to replace, and the problem that the powder needs to be replaced by opening a bin door when the powder amount is insufficient in the printing process is solved. By placing the powder barrel at a high position of the 3D printing device 100, a greater gravity difference is obtained, improving the flowability of the powder during printing. Powder is conveyed through the powder conveying pipe 32, the utilization rate of the powder is improved, and the problem that the powder needs to be recycled after printing is completed is solved. The original open powder bin is replaced, the roller 31 can prevent the powder from floating in the air, and the production environment is improved.

Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a 3D printing device, includes main part and defeated powder mechanism, and the main part includes casing and scraper, the casing is around forming the shaping chamber, the scraper is located in the shaping chamber, its characterized in that: defeated powder mechanism includes cylinder, defeated powder pipe and rotary driving piece, the cylinder includes urceolus and inner tube, the urceolus is located the casing top, the inner tube rotationally locates in the urceolus, the inner tube is used for holding the powder, the inner tube is equipped with first opening, the urceolus is equipped with the second opening, the second opening orientation the casing, rotary driving piece connects the inner tube is in order to drive its rotation, the inner tube rotates the back will the powder by first opening flows, defeated powder pipe one end is aimed at the second opening in order to accept by the powder that the second opening flows, defeated powder pipe other end stretches into in the shaping chamber in order to carry the powder.

2. The 3D printing apparatus according to claim 1, wherein: the powder conveying mechanism further comprises an air feeding piece, a pipeline of the air feeding piece extends into a position between the inner cylinder and the outer cylinder, and the air feeding piece is used for introducing hot air into a position between the inner cylinder and the outer cylinder to dry powder.

3. The 3D printing apparatus according to claim 2, wherein: the powder conveying mechanism further comprises an electric control part, a first gate and a second gate, the first gate is arranged on the inner barrel, the second gate is arranged on the outer barrel, and the electric control part is respectively and electrically connected with the first gate and the second gate so as to respectively control the first gate to open and close the first opening and control the second gate to open and close the second opening.

4. The 3D printing apparatus according to claim 3, wherein: defeated powder mechanism still includes the sensor, the sensor is located be used for responding to in the shaping cavity the position of scraper, electric control spare electric connection the sensor reaches the piece of sending gas, with when the scraper is located zero point position, control the piece of sending gas is dried the powder.

5. The 3D printing apparatus according to claim 1, wherein: the powder conveying pipe comprises a funnel part, the funnel part is located at one end facing the second opening, and the funnel part is used for receiving powder.

6. The 3D printing apparatus according to claim 1, wherein: and the length of the powder conveying pipe is greater than that of the scraper along the direction vertical to the moving direction of the scraper.