Additive manufacturing powder circulating device

Abstract

The utility model discloses a powder circulating device for additive manufacturing. The powder circulating device comprises a powder storage cylinder; printing a forming platform; a forming cylinder; a lifting platform; the powder falling mechanism comprises a containing groove used for containing powder; the powder screening mechanism is used for receiving the powder output by the powder falling mechanism, and a powder screen for filtering the powder is arranged in the powder screening mechanism; the powder returning mechanism is used for conveying the powder output from the powder screening mechanism; the powder transition cylinder is connected with the powder returning mechanism; wherein the powder transition cylinder is connected with the powder storage cylinder, and the horizontal plane where the powder transition cylinder is located is higher than the horizontal plane where the powder storage cylinder is located. By means of the mode, the material adding work efficiency can be improved, harm caused by long-time manual powder contact is reduced, the problems that in powder material adding, powder taking, screening and powder feeding are tedious, time consumption is large, production efficiency is low, and labor cost is high are effectively solved, the automation degree of equipment is also improved, and production efficiency is improved. Therefore, high-efficiency and low-cost production can be carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printers, and particularly relates to an additive manufacturing powder recycling device. Background Art

[0002] Additive manufacturing technology (i.e., 3D printers) is a new type of high-end rapid prototyping technology, including wire feeding additive manufacturing and powder feeding additive manufacturing technologies, and the powder feeding additive manufacturing technology includes laser / electron beam powder bed melting technology, powder binder jetting technology, etc.

[0003] However, in the traditional method, during powder additive manufacturing (i.e., when a 3D printer is printing), the powder cannot be recycled in real time. The generated powder requires a large amount of manual powder taking, screening, powder feeding and other operations, which affects the working duration of the 3D printer and results in low efficiency. At the same time, it will also cause health problems of the respiratory tract and lungs due to long-term human contact with the powder. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides an additive manufacturing powder recycling device to solve the above technical problems.

[0006] (II) Technical Solutions

[0007] To solve the above technical problems, the utility model provides the following technical solutions: an additive manufacturing powder recycling device, including a powder storage cylinder for outputting powder, a printing and forming platform, a forming cylinder arranged in the printing and forming platform, and a lifting table that can be lifted and arranged in the forming cylinder. It is characterized in that it further includes: a powder falling mechanism arranged in the printing and forming platform, wherein the powder falling mechanism includes a receiving groove arranged in the printing and forming platform and used for receiving powder, and the forming cylinder is arranged at the center of the receiving groove; a powder screening mechanism arranged below one end of the bottom of the receiving groove and used for receiving the powder output from the powder falling mechanism, wherein a powder sieve for filtering the powder is arranged in the powder screening mechanism; a powder return mechanism, the bottom end of which is connected to the powder screening mechanism and used for conveying the powder output from the powder screening mechanism; a powder transition cylinder arranged above the printing and forming platform, wherein the powder transition cylinder is connected to the powder return mechanism to convey the powder output from the powder screening mechanism into the powder transition cylinder through the powder return mechanism; wherein, the powder transition cylinder is connected to the powder storage cylinder, and the horizontal plane where the powder transition cylinder is located is higher than the horizontal plane where the powder storage cylinder is located, so that the powder in the powder transition cylinder automatically flows back into the powder storage cylinder.

[0008] Further, the molding cylinder is in a rectangular three-dimensional shape, and the receiving groove is in a rectangular three-dimensional shape, wherein the length and width of the horizontal cross-section of the molding cylinder are both smaller than the length and width of the horizontal cross-section of the receiving groove.

[0009] Further, one end of the bottom of the receiving groove is provided with a powder discharging outlet, and the powder discharging mechanism further includes a powder conveying channel connected to the powder discharging outlet and a powder discharging shaft rotatably arranged in the powder conveying channel, wherein the top end of the powder screening mechanism is connected to the bottom end of the powder conveying channel.

[0010] Further, the horizontal width of the inner hole of the powder conveying channel is equal to the horizontal width of the powder discharging shaft, a plurality of powder collecting grooves are arranged at intervals on the outer wall of the powder discharging shaft, the bottom of the receiving groove is arranged as an inclined surface, and the horizontal plane where one end of the bottom of the receiving groove is located is lower than the horizontal plane where the other end of the bottom of the receiving groove is located. The powder discharging mechanism further includes a powder discharging auxiliary block in a triangular prism shape, and the powder discharging auxiliary block is arranged between the side wall at the other end of the receiving groove and the molding cylinder.

[0011] Further, the powder screening mechanism includes a powder screening bin and a vibrator. The top end of the powder screening bin is connected to the bottom end of the powder conveying channel, and the bottom end of the powder screening bin is connected to the bottom end of the powder returning mechanism. The powder screening mesh is arranged in the middle of the powder screening bin, and the vibrator is arranged on the powder screening mesh to drive the powder screening mesh to vibrate.

[0012] Further, the bottom surface of the inner cavity of the powder screening bin is arranged in an inclined shape, and the horizontal plane where one end of the bottom surface of the inner cavity of the powder screening bin is located is lower than the horizontal plane where the other end of the bottom surface of the inner cavity of the powder screening bin is located. One end of the bottom surface of the inner cavity of the powder screening bin is provided with a powder screening bin powder outlet connected to the bottom end of the powder returning mechanism.

[0013] Further, the powder returning mechanism includes an inclined returning mechanism housing and a conveyor belt. A receiving cavity is arranged along the length direction in the returning mechanism housing. A first synchronous shaft is rotatably arranged at one end of the receiving cavity, and a second synchronous shaft is rotatably arranged at the other end of the receiving cavity. The conveyor belt is wound around the first synchronous shaft and the second synchronous shaft. A plurality of support plates are arranged at intervals along the length direction of the conveyor belt. The support plates and the conveyor belt form a clamping groove for receiving powder. A powder returning inlet connected to the powder screening bin powder outlet is arranged at the bottom end of one side surface of the returning mechanism housing, and a powder returning outlet connected to the powder transition cylinder is arranged at the top end of the other side of the returning mechanism housing.

[0014] Further, it further includes: a dust residue cylinder, connected to the bottom end of the returning mechanism housing, for recovering the powder in the receiving cavity.

[0015] Furthermore, the lengths of the multiple support plates are the same. When the conveyor belt conveys powder upward, the outermost end of the support plate at the lowest position forms a first included angle with the straight line D parallel to the conveyor belt and the straight line C perpendicular to the horizontal. The end bottom plate position of the powder outlet of the powder screening bin is within the first included angle. When the conveyor belt discharges powder downward, the outermost end of the support plate at the highest position forms a second included angle with the straight line B parallel to the conveyor belt and the straight line A perpendicular to the horizontal. The inner end bottom plate of the powder return outlet is within the second included angle.

[0016] Furthermore, a receiving cavity is provided inside the powder transition cylinder. A powder feeding port communicating with the receiving cavity and connected to the powder return outlet is provided at the top end of the powder transition cylinder. A partition block in a triangular three-dimensional shape is provided inside the receiving cavity, dividing the receiving cavity into a symmetrically arranged first receiving cavity and a second receiving cavity. A first inclined channel communicating with the first receiving cavity and a second inclined channel communicating with the second receiving cavity are extended and provided at the bottom of the powder transition cylinder, and both the first inclined channel and the second inclined channel are communicated with the powder storage cylinder.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present utility model provides an additive manufacturing powder recycling device, which has the following beneficial effects: The additive manufacturing powder recycling device disclosed by the present utility model includes a powder storage cylinder, a printing and forming platform, a forming cylinder, a lifting table, a powder dropping mechanism, a powder screening mechanism, a powder return mechanism, and a powder transition cylinder. Among them, the powder transition cylinder is connected to the powder storage cylinder, so that the powder in the powder transition cylinder automatically flows back into the powder storage cylinder. In the above manner, the present utility model can automatically recover the powder and re-transport it into the powder storage cylinder without printing operation processing, which can effectively improve the additive manufacturing efficiency, reduce the harm caused by the long duration of manual contact with the powder, effectively solve the problems of cumbersome powder taking, screening, powder feeding, large time consumption, low production efficiency, and high labor cost in powder additive manufacturing, and also improve the automation degree of the equipment, so as to enable high-efficiency and low-cost production. Description of the Drawings

[0019] Figure 1 is a three-dimensional structural schematic diagram of the additive manufacturing powder recycling device of the present utility model;

[0020] Figure 2 is Figure 1 the sectional structural schematic diagram of the additive manufacturing powder recycling device in

[0021] Figure 3 is Figure 1 the first partial structural schematic diagram of the additive manufacturing powder recycling device in

[0022] Figure 4 is Figure 1 a schematic diagram of the second partial structure of the powder recycling device in additive manufacturing;

[0023] Figure 5 is Figure 1 a schematic diagram of the third partial structure of the powder recycling device in additive manufacturing;

[0024] Figure 6 is Figure 1 a schematic diagram of the powder dropping shaft of the powder dropping mechanism in;

[0025] Figure 7 is Figure 1 a schematic diagram of the powder transition cylinder in;

[0026] Figure 8 is Figure 1 a schematic diagram of the first partial sectional structure of the powder return mechanism in;

[0027] Figure 9 is Figure 1 a schematic diagram of the second partial sectional structure of the powder return mechanism in. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] As Figure 1-9 shown, the present invention discloses an additive manufacturing powder recycling device, which includes a powder storage cylinder 10 for outputting powder, a printing and forming platform 11, a forming cylinder 12 arranged in the printing and forming platform 11, a lifting platform 13 that can be lifted and arranged in the forming cylinder 12, a powder dropping mechanism 14, a powder screening mechanism 15, a powder return mechanism 16, and a powder transition cylinder 17.

[0030] The powder dropping mechanism 14 is arranged in the printing and forming platform 11, wherein the powder dropping mechanism 14 includes a receiving groove 141 arranged in the printing and forming platform 11 and used for receiving powder, and the forming cylinder 12 is arranged at the center of the receiving groove 141.

[0031] Preferably, the forming cylinder 12 is in a rectangular three-dimensional shape, the receiving groove 141 is in a rectangular three-dimensional shape, wherein the length and width of the horizontal cross-section of the forming cylinder 12 are both smaller than the length and width of the horizontal cross-section of the receiving groove 141. Or the length and width of the horizontal cross-section of the top end of the forming cylinder 12 are both smaller than the length and width of the horizontal cross-section of the top end of the receiving groove 141.

[0032] It should be understood that when performing powder bed fusion additive manufacturing, the powder in the powder storage cylinder 10 is layer-by-layer spread into the forming cylinder 12 for printing. After printing is completed, the lifting platform 13 is lifted to take out the printed sample. At this time, the excess powder that has not been adhesively formed in the forming cylinder 12 overflows and flows into the receiving groove 141. In addition, the powder storage cylinder 10, the printing and forming platform 11, the forming cylinder 12, and the lifting platform 13 in this embodiment can be realized by products in the prior art, and their principles and structures will not be elaborated here one by one.

[0033] In this embodiment, the bottom of the receiving groove 141 is arranged as an inclined surface, so the powder falling into the receiving groove 141 will move in one direction. Specifically, the horizontal plane where one end of the bottom of the receiving groove 141 is located is lower than the horizontal plane where the other end of the bottom of the receiving groove 141 is located, so that the powder falling into the receiving groove 141 will flow towards one end of the bottom of the receiving groove 141.

[0034] Furthermore, the powder falling mechanism 14 further includes a powder falling auxiliary block 140 in the shape of a triangular prism, and the powder falling auxiliary block 140 is arranged between the side wall at the other end of the receiving groove 141 and the forming cylinder 12. It should be understood that since the powder falling auxiliary block 140 is in the shape of a triangular prism, when the powder falls into the receiving groove 141, some powder quickly falls into the other end of the receiving groove 141 through the powder falling auxiliary block 140, and the powder at the other end of the receiving groove 141 will also quickly flow to one end of the receiving groove 141.

[0035] The powder screening mechanism 15 is arranged below one end of the bottom of the receiving groove 141 and is used to receive the powder output from the powder falling mechanism 14, and a powder sieve mesh 151 for filtering the powder is arranged in the powder screening mechanism 15.

[0036] The bottom end of the powder conveying-back mechanism 16 is connected to the powder screening mechanism 15 and is used to convey the powder output from the powder screening mechanism 15. It should be understood that the powder conveying-back mechanism 16 is horizontally inclined.

[0037] The powder transition cylinder 17 is arranged above the printing and forming platform 11, and the powder transition cylinder 17 is connected to the powder conveying-back mechanism 16 to convey the powder output from the powder screening mechanism 15 into the powder transition cylinder 17 through the powder conveying-back mechanism 16.

[0038] In this embodiment, the powder transition cylinder 17 is connected to the powder storage cylinder 10. The horizontal plane where the powder transition cylinder 17 is located is higher than the horizontal plane where the powder storage cylinder 10 is located, so that the powder in the powder transition cylinder 17 automatically flows back into the powder storage cylinder 10. It should be understood that since the horizontal plane where the powder transition cylinder 17 is located is higher than the horizontal plane where the powder storage cylinder 10 is located, the powder in the powder transition cylinder 17 will automatically flow back into the powder storage cylinder 10 due to gravity without the need for additional power drive, saving costs.

[0039] In this embodiment, a powder discharging outlet 1411 is provided at one end of the bottom of the receiving groove 141. The powder discharging mechanism 14 further includes a powder conveying channel 142 connected to the powder discharging outlet 1411 and a powder discharging shaft 143 rotatably arranged in the powder conveying channel 142. The top end of the powder screening mechanism 15 is connected to the bottom end of the powder conveying channel 142, so that the powder in the receiving groove 141 is input into the powder conveying channel 142 through the powder discharging outlet 1411 and is input into the powder screening mechanism 15 through the powder conveying channel 142.

[0040] Preferably, the horizontal width of the inner hole of the powder conveying channel 142 is equal to the horizontal width of the powder discharging shaft 143. A plurality of powder collecting grooves 1431 are arranged at intervals on the outer wall of the powder discharging shaft 143. It should be understood that the horizontal length of the inner hole of the powder conveying channel 142 is equal to the horizontal length of the powder discharging shaft 143. Therefore, when the powder discharging shaft 143 does not rotate, the powder discharging shaft 143 blocks the powder conveying channel 142, so that the powder in the powder conveying channel 142 cannot flow into the powder screening mechanism 15. The plurality of powder collecting grooves 1431 are arranged along the length direction of the powder discharging shaft 143, and the powder collecting grooves 1431 are used for collecting powder. When the powder discharging shaft 143 rotates, the powder collecting grooves 1431 of the powder discharging shaft 143 carry the powder to rotate together, and finally the powder in the powder collecting grooves 1431 falls into the powder screening mechanism 15. Thus, the powder discharging amount can be controlled by controlling the rotation speed of the powder discharging shaft 143 as needed.

[0041] It should be noted that the powder discharging shaft 143 of this embodiment is connected to the first driving motor, and the powder discharging shaft 143 can be driven to rotate by the first driving motor.

[0042] In this embodiment, the powder screening mechanism 15 includes a powder screening bin 150 and a vibrator. The top end of the powder screening bin 150 is connected to the bottom end of the powder conveying channel 142, and the bottom end of the powder screening bin 140 is connected to the bottom end of the powder conveying-back mechanism 16, so that the powder input into the powder screening bin 150 from the powder conveying channel 142 flows into the powder conveying-back mechanism 16 after being filtered by the powder screening mesh 151.

[0043] Preferably, the powder screening mesh 151 is arranged in the middle of the powder screening bin 150, and the vibrator is arranged on the powder screening mesh 151 to drive the powder screening mesh 151 to vibrate. It should be understood that the vibrator of this embodiment can be implemented by using products in the prior art, and the principles and structures thereof will not be elaborated here one by one.

[0044] Further, the bottom surface of the inner cavity of the powder screening bin 150 is inclined, wherein the horizontal plane where one end of the bottom surface of the inner cavity of the powder screening bin 150 is located is lower than the horizontal plane where the other end of the bottom surface of the inner cavity of the powder screening bin 150 is located, so that the powder in the powder screening bin 150 will flow from the other end of the bottom surface of the inner cavity of the powder screening bin 150 to the one end of the bottom surface of the inner cavity of the powder screening bin 150.

[0045] Preferably, a powder screening bin powder outlet 1501 connected to the bottom end of the powder return mechanism 16 is provided at one end of the bottom surface of the inner cavity of the powder screening bin 150.

[0046] In this embodiment, the powder return mechanism 16 includes an inclined return mechanism housing 161 and a conveyor belt 162. A receiving cavity 160 is provided along the length direction inside the return mechanism housing 161. A first synchronous shaft 1601 is rotatably provided at one end of the receiving cavity 160, and a second synchronous shaft 1602 is rotatably provided at the other end of the receiving cavity 160. The conveyor belt 162 is wound around the outside of the first synchronous shaft 1601 and the second synchronous shaft 1602, so that when the first synchronous shaft 1601 or the second synchronous shaft 1602 rotates, the conveyor belt 162 is driven to rotate.

[0047] It should be noted that the first synchronous shaft 1601 or the second synchronous shaft 1602 of this embodiment is connected to the second driving motor to drive the first synchronous shaft 1601 or the second synchronous shaft 1602 to rotate through the second driving motor, thereby driving the conveyor belt 162 to rotate (such as Figure 4 the counterclockwise rotation shown).

[0048] Further, a plurality of support plates 1621 are provided at intervals along the length direction of the conveyor belt 162. A clamping groove for receiving powder is formed between the support plates 1621 and the conveyor belt 162. A powder return inlet 1611 connected to the powder screening bin powder outlet 1501 is provided at the bottom end of one side surface of the return mechanism housing 161, and a powder return outlet 1612 connected to the powder transition cylinder 17 is provided at the top end of the other side of the return mechanism housing 161. So that the powder input from the powder screening bin powder outlet 1501 of the powder screening bin 150 enters the receiving cavity 160 from the powder return inlet 1611 and falls into the clamping groove formed between the support plates 1621 and the conveyor belt 162. As the conveyor belt 162 moves, the powder carried by the clamping groove finally falls into the powder return outlet 1612 and is conveyed from the powder return outlet 1612 to the powder transition cylinder 17.

[0049] Preferably, the lengths of the plurality of support plates 1621 are the same, and the width of the support plates 1621 is the same as the width of the conveyor belt 162.

[0050] In order to enable the powder to accurately fall into the clamping groove formed by the support plate 1621 and the conveyor belt 162, in this embodiment, when the conveyor belt 162 conveys powder upward (i.e., rotates counterclockwise), the outermost end of the support plate 1621 at the lowest position (i.e., Figure 8 the support plate 1621-1 in Figure 8 , the support plate at the lowest position on the same side as the powder outlet 1501 of the powder screening bin) forms a first included angle a with the straight line D parallel to the conveyor belt 162 and the straight line C perpendicular to the horizontal. The end bottom plate position of the powder outlet 1501 of the powder screening bin is within the first included angle a. It should be understood that when the end bottom plate position of the powder outlet 1501 of the powder screening bin is within the first included angle a, the powder input from the powder outlet 1501 of the powder screening bin can just fall into the clamping groove formed by the support plate 1621 and the conveyor belt 162. When the end bottom plate position of the powder outlet 1501 of the powder screening bin is not within the first included angle a, the powder input from the powder outlet 1501 of the powder screening bin hardly or rarely falls into the clamping groove formed by the support plate 1621 and the conveyor belt 162.

[0051] In order to enable the powder in the clamping groove of the conveyor belt 162 to accurately fall into the powder return outlet 1612, in this embodiment, when the conveyor belt 162 discharges powder downward (i.e., rotates counterclockwise), the outermost end of the support plate 1621 at the highest position (i.e., Figure 9 the support plate 1621-2 in Figure 9 , the support plate at the highest position on the same side as the powder return outlet 1612. Additionally, the support plate above the support plate 1621-2 is not completely on the same side as the powder return outlet 1612) forms a second included angle b with the straight line B parallel to the conveyor belt 162 and the straight line A perpendicular to the horizontal. The inner end bottom plate of the powder return outlet 1612 is within the second included angle b. It should be understood that when the inner end bottom plate of the powder return outlet 1612 is within the second included angle b, the powder falling from the clamping groove of the conveyor belt 162 can just fall into the powder return outlet 1612. When the inner end bottom plate of the powder return outlet 1612 is not within the second included angle b, the powder falling from the clamping groove of the conveyor belt 162 hardly or rarely falls into the powder return outlet 1612, and most of it will fall into the receiving cavity 160.

[0052] Furthermore, the additive manufacturing powder recycling device further includes a dust residue cylinder 18, wherein the dust residue cylinder 18 is connected to the bottom end of the return mechanism housing 161 and is used to recycle the powder in the receiving cavity 160. It should be understood that the horizontal plane where the connection port of the dust residue cylinder 18 and the return mechanism housing 161 is located is lower than the powder return inlet 1611. There will be some dust during the transportation of the powder in the receiving cavity 160, and after the dust precipitates, it enters the dust residue cylinder 18 from the bottom end of the return mechanism housing 161.

[0053] In this embodiment, a receiving inner cavity is provided in the powder transition cylinder 17. A powder feeding port that is communicated with the receiving inner cavity and connected to the powder return outlet 1612 is provided at the top of the powder transition cylinder 17. A partition block 173 in a triangular three-dimensional shape is provided in the receiving inner cavity, and the receiving inner cavity is divided into a symmetrically arranged first receiving inner cavity 171 and a second receiving inner cavity 172. A first inclined channel 174 communicated with the first receiving inner cavity 171 and a second inclined channel 175 communicated with the second receiving inner cavity 172 are extended and provided at the bottom of the powder transition cylinder 17. Both the first inclined channel 174 and the second inclined channel 175 are communicated with the powder storage cylinder 10, so that the powder input from the powder return outlet 1612 enters the receiving cavity through the powder feeding port, and then is separated by the partition block 173 and enters the first receiving inner cavity 171 and the second receiving inner cavity 172 respectively. Finally, the powder naturally flows into the powder storage cylinder 10 through the first inclined channel 174 and the second inclined channel 175 according to gravity, achieving the effect of powder recovery and reuse.

[0054] Preferably, the first receiving inner cavity 171 and the second receiving inner cavity 172 are symmetrically arranged, and the first inclined channel 174 and the second inclined channel 175 are both inclined, which can enable the powder to better flow back into the powder storage cylinder 10, thus preventing the existence of powder storage blind spots.

[0055] It should be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An additive manufacturing powder circulation device, comprising a powder storage cylinder for outputting powder, a printing and forming platform, a forming cylinder arranged in the printing and forming platform, and a lifting platform that can be lifted and lowered in the forming cylinder, characterized in that: Also includes: A powder dropping mechanism is arranged in the printing and forming platform, wherein the powder dropping mechanism comprises a receiving groove arranged in the printing and forming platform and used to receive powder, and the forming cylinder is arranged at the center of the receiving groove; A powder screening mechanism is arranged below one end of the bottom of the receiving groove, and is used to receive the powder output from the powder dropping mechanism, wherein a powder screen is provided in the powder screening mechanism for filtering the powder; A powder return mechanism, the bottom end of which is connected to the powder screening mechanism, and is used to transport the powder output from the powder screening mechanism; A powder transition cylinder is arranged above the printing and forming platform, wherein the powder transition cylinder is connected to the powder return mechanism so as to transport the powder output from the powder screening mechanism to the powder transition cylinder through the powder return mechanism; The powder transition cylinder is connected to the powder storage cylinder, and the horizontal plane of the powder transition cylinder is higher than the horizontal plane of the powder storage cylinder, so that the powder in the powder transition cylinder automatically flows back into the powder storage cylinder.

2. The additive manufacturing powder circulation device according to claim 1, characterized in that: The forming cylinder is in a rectangular three-dimensional shape, and the receiving groove is in a rectangular three-dimensional shape, wherein the length and width of the horizontal cross section of the forming cylinder are both smaller than the length and width of the horizontal cross section of the receiving groove.

3. The additive manufacturing powder circulation device according to claim 1, characterized in that: A powder outlet is provided at one end of the bottom of the receiving groove, and the powder dropping mechanism also includes a powder conveying channel connected to the powder outlet and a powder dropping shaft rotatably arranged in the powder conveying channel, wherein the top end of the powder screening mechanism is connected to the bottom end of the powder conveying channel.

4. The additive manufacturing powder circulation device according to claim 3, characterized in that: The horizontal width of the inner hole of the powder conveying channel is equal to the horizontal width of the powder dropping shaft, and a plurality of powder collecting grooves are arranged at intervals on the outer wall of the powder dropping shaft. The bottom of the receiving groove is arranged in an inclined surface, and the horizontal plane where one end of the bottom of the receiving groove is located is lower than the horizontal plane where the other end of the bottom of the receiving groove is located, wherein the powder dropping mechanism also includes a triangular-shaped powder dropping auxiliary block, wherein the powder dropping auxiliary block is arranged between the side wall of the other end of the receiving groove and the forming cylinder.

5. The additive manufacturing powder circulation device according to claim 3, characterized in that: The powder screening mechanism includes a powder screening bin and a vibrator, the top of the powder screening bin is connected to the bottom of the powder conveying channel, the bottom of the powder screening bin is connected to the bottom of the powder return mechanism, wherein the powder screen is arranged in the middle of the powder screening bin, and the vibrator is arranged on the powder screen to drive the powder screen to vibrate.

6. The additive manufacturing powder circulation device according to claim 5, characterized in that: The bottom surface of the inner cavity of the powder sieving bin is arranged in an inclined shape, and the horizontal plane where one end of the bottom surface of the inner cavity of the powder sieving bin is located is lower than the horizontal plane where the other end of the bottom surface of the inner cavity of the powder sieving bin is located, wherein one end of the bottom surface of the inner cavity of the powder sieving bin is provided with a powder outlet of the powder sieving bin connected to the bottom end of the powder return mechanism.

7. The additive manufacturing powder circulation device according to claim 6, characterized in that: The powder return mechanism includes an inclined return mechanism shell and a conveyor belt, a receiving cavity is provided in the return mechanism shell along its length direction, a first synchronous shaft is rotatably provided at one end of the receiving cavity, and a second synchronous shaft is rotatably provided at the other end of the receiving cavity, and the conveyor belt is arranged around the first synchronous shaft and the second synchronous shaft, wherein the conveyor belt is provided with a plurality of support plates at intervals along its length direction, the support plates and the conveyor belt form a clamping groove for accommodating powder, and a powder return inlet connected to the powder outlet of the powder screening bin is provided at the bottom end of one side surface of the return mechanism shell, and a powder return outlet connected to the powder transition cylinder is provided at the top end of the other side of the return mechanism shell.

8. The additive manufacturing powder circulation device according to claim 7, characterized in that: Also includes: The dust residual material cylinder is connected to the bottom end of the housing of the return mechanism and is used for recovering the powder in the receiving cavity.

9. The additive manufacturing powder circulation device according to claim 7, characterized in that: The lengths of the multiple support plates are all the same. When the conveyor belt carries powder upward, the outermost end of the support plate at the bottom forms a first angle with a straight line D parallel to the conveyor belt and a horizontally vertical straight line C, and the end bottom plate position of the powder outlet of the powder screening bin is within the first angle; when the conveyor belt unloads powder downward, the outermost end of the support plate at the highest point forms a second angle with a straight line B parallel to the conveyor belt and a horizontally vertical straight line A, and the inner end bottom plate of the powder return outlet is within the second angle.

10. The additive manufacturing powder circulation device according to claim 7, characterized in that: A receiving cavity is provided in the powder transition cylinder, a powder delivery port which is communicated with the receiving cavity and connected with the powder return outlet is provided at the top of the powder transition cylinder, a dividing block which is triangular in shape and divides the receiving cavity into a first receiving cavity and a second receiving cavity which are symmetrically arranged is provided in the receiving cavity, a first inclined channel which is communicated with the first receiving cavity and a second inclined channel which is communicated with the second receiving cavity are extended from the bottom of the powder transition cylinder, and both the first inclined channel and the second inclined channel are communicated with the powder storage cylinder.

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