CN211542412U

CN211542412U - Be suitable for last powder feeding device of SLM, SLS and BJ

Info

Publication number: CN211542412U
Application number: CN201922050810.9U
Authority: CN
Inventors: 杨永强; 翁丰强; 吴世彪; 陈杰; 魏宏鸣
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-09-22
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses an upper powder feeding device suitable for SLM, SLS and BJ, which comprises a powder storage cylinder, a lower powder conveying mechanism and a lower powder hopper; the powder storage cylinder is arranged above the powder discharging conveying mechanism; the powder feeding and conveying mechanism comprises a driving rolling shaft, a driven rolling shaft and a toothed belt, the driving rolling shaft and the driven rolling shaft are arranged on two side edges of the powder storage cylinder, and the toothed belt is wound on the driving rolling shaft and the driven rolling shaft; and a powder discharging funnel is arranged on one side of the driving rolling shaft, and a powder outlet of the powder discharging funnel faces the powder paving vehicle. The utility model discloses an on send whitewashed device to use the cingulum to convey powder, the tooth top of cingulum and store up whitewashed jar wall and form inclosed space, the powder is difficult for leaking the powder in data send process. The utility model relates to a 3D prints technical field.

Description

Be suitable for last powder feeding device of SLM, SLS and BJ

Technical Field

The utility model relates to a 3D prints technical field, in particular to last powder feeding device who is suitable for SLM, SLS and BJ.

Background

BJ (Binder Jetting), also known as cohesive jet, inkjet powder printing. BJ is a manufacturing technique in which one or more materials are continuously bonded as entities, and then a sample is obtained by a post-heat treatment. 3D printing (additive manufacturing), also known as rapid prototyping, where SLM (selective laser melting) and SLS (selective laser sintering) are one manufacturing technique for building three-dimensional objects by successively fusing more than one thin layer of material.

BJ. SLM and SLS equipment all need to realize the shop powder function, and three kinds of equipment feeding mode are similar or even the same. The three materials are supplied by the powder supply device, and then the powder is spread on the printing platform by the horizontal powder spreading device. Powder bed additive manufacturing is the most common of the three, and the efficiency of the powder feeding device in the powder feeding mode influences the efficiency of the whole process. The existing upper powder feeding device usually adopts a falling powder feeding mode realized by combining powder gravity with a rolling bearing (rolling shaft), the powder feeding mode has the advantages that the powder feeding mode is realized by the fact that the powder is fed by a groove of the rolling shaft, the falling powder amount is reduced when the air pressure of a machine is greater than one atmospheric pressure, when the air pressure of a working area is less than one atmospheric pressure, the automatic powder leakage is caused, the powder laying is inaccurate, unnecessary waste is possibly caused, the powder laying effect is influenced, the processing efficiency is greatly reduced, and the device is not favorable for batch production.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect and not enough, provide a last powder feeding device who is suitable for SLM, SLS and BJ, it is less influenced by atmospheric pressure, can effectively reduce or even eliminate the powder leakage phenomenon.

The purpose of the utility model can be realized by the following technical scheme: an upper powder feeding device suitable for SLM, SLS and BJ comprises a powder storage cylinder, a lower powder conveying mechanism and a lower powder hopper; the powder storage cylinder is arranged above the powder discharging conveying mechanism; the powder feeding and conveying mechanism comprises a driving rolling shaft, a driven rolling shaft and a toothed belt, the driving rolling shaft and the driven rolling shaft are arranged on two side edges of the powder storage cylinder, and the toothed belt is wound on the driving rolling shaft and the driven rolling shaft; and a powder discharging funnel is arranged on one side of the driving rolling shaft, and a powder outlet of the powder discharging funnel faces the powder paving vehicle.

Preferably, the toothed belt comprises a tooth top and a tooth bottom, and the tooth top and the powder storage cylinder wall form a closed space. The tooth top width of the toothed belt is greater than or equal to the tooth bottom width, and the tooth top width is less than or equal to the wall thickness of the powder storage cylinder. The tooth top of the toothed belt and the wall of the powder storage cylinder form a closed space, so that powder is not easy to leak in the conveying process.

As a preferable technical scheme, the powder storage cylinder, the powder discharging conveying mechanism and the powder discharging hopper are covered by a shell cover.

As a preferable technical scheme, the driving rolling shaft and the driven rolling shaft are driven by a power motor and roll along the same direction. The power motor can be a stepping motor.

As a preferred technical scheme, a sealing cover is arranged at the top of the powder storage cylinder and detachably connected with a cylinder body of the powder storage cylinder. The powder storage cylinder can be conveniently opened by the sealing cover.

According to a preferable technical scheme, the upper part of the sealing cover is provided with a powder adding pipe, and a butterfly valve is installed on the powder adding pipe. The powder adding pipe and the butterfly valve are arranged, so that powder can be conveniently added into the powder storage cylinder.

As a preferable technical scheme, the bottom of the powder paving vehicle is provided with a scraper and is driven by a power device.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model discloses store up the powder in the powder jar and spread the back by the cingulum, store up the volume reduction of the powder of powder jar, and along with the circulation rotation of cingulum, when the new cingulum part that does not pass the powder got into the powder jar of storage, the air at the bottom of the tooth has been mended and has been lost that partial volume of powder for the atmospheric pressure change in the powder jar of storage is little, receives the atmospheric pressure influence for a short time.

2. The utility model discloses an on send whitewashed device to use the cingulum to convey powder, the tooth top of cingulum and store up whitewashed jar wall and form inclosed space, the powder is difficult for leaking the powder in data send process.

3. The utility model discloses by the tooth bottom dress powder of cingulum, send powder to powder funnel down, store up the powder of powder jar and receive the action of gravity, all fill the powder at the bottom of the tooth at every turn, send the powder volume stable.

4. The utility model discloses an on send whitewashed device to have relative independence, can install a plurality of on this send whitewashed devices on same SLM, SLS or BJ equipment, realize the confession powder function of the arbitrary compound mode of multiple material to be favorable to improving machining efficiency, the suitability is wider, helps mass production.

Drawings

FIG. 1 is a schematic diagram of the upper powder feeder according to the embodiment of the present invention;

FIG. 2 is a schematic structural view of an upper powder feeding device in an embodiment of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2;

fig. 4 is a partial enlarged view of the toothed belt in an embodiment of the present invention.

Wherein: 1: powder storage cylinder, 2: driven roller, 3: driving roller, 4: toothed belt, 41: tooth bottom, 42: tooth tip, 43: closed zone, 5: powder feeding funnel, 6: housing cover, 7: powder adding pipe, 71: butterfly valve, 8: powder, 9: stepping motor, 10: seal cap, 11: powder paving vehicle, 111: scraper, 12: molding cylinder, 121: forming cylinder base, 122: forming cylinder screw rod, 13: ink jet vehicle, 14: a working platform.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

As shown in FIG. 1, the upper powder feeding device suitable for SLM, SLS and BJ comprises a powder storage cylinder, a lower powder conveying mechanism and a lower powder hopper.

Store up the powder jar and be used for the storage to print the powder, it is installed in powder transport mechanism top down, and the top is equipped with sealed lid, and sealed lid is detained in the cylinder body upper end that stores up the powder jar, conveniently opens and stores up the powder jar. Sealed lid upper portion is equipped with the powder pipe for add and print the powder, add and install the butterfly valve on the powder pipe, the butterfly valve is opened and to be added the powder, adds the powder and accomplishes the back, closes the butterfly valve and seals.

The powder feeding and conveying mechanism comprises a driving rolling shaft, a driven rolling shaft and a toothed belt, the driving rolling shaft and the driven rolling shaft are arranged on two side edges of the powder storage cylinder, and the toothed belt is wound on the driving rolling shaft and the driven rolling shaft. The stepping motor is arranged on one side of the driving rolling shaft and drives the driving rolling shaft and the driven rolling shaft to roll in the same direction. The powder feeding amount of the powder feeding device can be controlled by controlling the stepping rotating speed. As shown in fig. 2, the toothed belt includes a tooth top and a tooth bottom, the tooth bottom is used for carrying powder, and the toothed belt is driven by the driving roller and the driven roller to move, so that the powder on the toothed belt is conveyed. In order to form a sealing area between the tooth top of the toothed belt and the powder storage cylinder wall and prevent powder leakage, the tooth top width of the toothed belt is designed to be larger than or equal to the tooth bottom width, and the tooth top width is smaller than or equal to the wall thickness of the powder storage cylinder. Therefore, the tooth top and the powder storage cylinder wall form a sealing area, and the powder is not easy to leak in the powder conveying process. In the embodiment, the upper powder feeding device mainly loads and feeds powder to the lower powder hopper by the tooth bottoms of the toothed belts, the gravity borne by the powder in the powder storage cylinder is concentrated at the cylinder bottom, the tooth bottoms of the toothed belts can be filled with the powder every time, and the powder feeding amount is stable. After the powder storage cylinder is conveyed out of the powder by the toothed belt, the volume of the powder in the powder storage cylinder is reduced, and along with the cyclic rotation of the toothed belt, the air filled at the tooth bottom enters the powder storage cylinder when a new toothed belt part without powder transmission enters the powder storage cylinder, and the newly-entered air supplements the volume of the part losing powder in the powder storage cylinder, so that the air pressure change of the powder storage cylinder is not large, and the influence of the air pressure is small.

As shown in fig. 3 and 4, a powder hopper is installed on the side of the driving roller, and when powder is transferred to the driving roller through the toothed belt, the powder falls onto the powder paving vehicle through the powder hopper. In order to form the integral upper powder feeding device, the powder storage cylinder, the lower powder conveying mechanism and the lower powder hopper are covered by a shell cover.

The powder paving vehicle is arranged under the lower powder hopper, the bottom of the powder paving vehicle is provided with a scraper, and the scraper is driven by a power device to move on the working platform. After the powder falls on the powder spreading vehicle, the powder spreading vehicle is driven by the power device to move towards the forming cylinder, the powder is scraped onto the forming cylinder base, the ink spraying vehicle above the forming cylinder sprays ink to the powder on the forming cylinder base, and the forming cylinder base completes downward movement under the action of the forming cylinder screw rod, so that ink-jet printing is realized.

The utility model relates to a be suitable for last powder feeding device of SLM, SLS and BJ's theory of operation as follows: and opening a butterfly valve, and adding a proper amount of powder into the powder storage cylinder through a powder adding pipe. And turning on the stepping motor, and driving the toothed belt to move by the stepping motor. The powder in the powder storage cylinder moves to the driving roller along with the toothed belt, and falls into the powder falling hopper; the powder falls onto a powder spreading vehicle along a powder falling funnel to realize powder falling. Stopping the stepping motor and stopping powder falling. The powder spreading vehicle is driven by the power device to move towards the forming cylinder to scrape powder onto the forming cylinder base, the ink spraying vehicle above the forming cylinder sprays ink to the powder on the forming cylinder base, and the forming cylinder base completes downward movement under the action of the forming cylinder screw rod, so that ink-jet printing is realized.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The upper powder feeding device suitable for the SLM, the SLS and the BJ is characterized by comprising a powder storage cylinder, a lower powder conveying mechanism and a lower powder hopper; the powder storage cylinder is arranged above the powder discharging conveying mechanism; the powder feeding and conveying mechanism comprises a driving rolling shaft, a driven rolling shaft and a toothed belt, the driving rolling shaft and the driven rolling shaft are arranged on two side edges of the powder storage cylinder, and the toothed belt is wound on the driving rolling shaft and the driven rolling shaft; and a powder discharging funnel is arranged on one side of the driving rolling shaft, and a powder outlet of the powder discharging funnel faces the powder paving vehicle.

2. The upward powder feeding device suitable for the SLM, SLS and BJ as recited in claim 1, wherein said toothed belt includes a tooth top and a tooth bottom, the tooth top and the powder storage cylinder wall form a closed space.

3. The upward powder feeding device suitable for the SLM, SLS and BJ as recited in claim 2, wherein the tooth top width of the toothed belt is greater than or equal to the tooth bottom width, and the tooth top width is less than or equal to the wall thickness of the powder storage cylinder.

4. The upward powder delivery apparatus for SLM, SLS and BJ as recited in claim 1, wherein said powder storage cylinder, said powder hopper and said powder delivery mechanism are covered by a housing cover.

5. The powder feeding device suitable for the SLM, SLS and BJ as recited in claim 1, wherein said driving roller and said driven roller are driven by a power motor and roll in the same direction.

6. The upward powder feeding device suitable for the SLM, SLS and BJ as recited in claim 1, wherein a sealing cover is arranged at the top of the powder storage cylinder, and the sealing cover is detachably connected with the cylinder body of the powder storage cylinder.

7. The powder feeding device suitable for the SLM, SLS and BJ as recited in claim 6, wherein said sealing cover is provided with a powder feeding tube at the upper part, and a butterfly valve is installed on the powder feeding tube.

8. The powder feeding device suitable for the SLM, SLS and BJ as claimed in claim 1, wherein the bottom of the powder paving vehicle is provided with a scraper and driven by a power device.