Powder treatment system for additive manufacturing and working method thereof

Abstract

According to the technical scheme, the powder processing system for additive manufacturing is characterized by comprising a powder cleaning cabinet, a powder cleaning table is arranged in the powder cleaning cabinet, a forming barrel is placed on one side of the lower portion of the powder cleaning table, used old powder is contained in the forming barrel, and the forming barrel is provided with a powder discharging opening; a vibrating screen used for screening old powder or new powder is arranged on the other side of the lower portion of the powder cleaning table, a feeding barrel used for receiving screened powder is arranged below the vibrating screen, a dust suction cabinet communicated with the powder cleaning cabinet is arranged outside the powder cleaning cabinet, a dust suction device is arranged in the dust suction cabinet, and a powder recycling barrel and a powder mixing barrel are further arranged outside the powder cleaning cabinet. And a powder mixing device for fully mixing new powder and old powder is arranged in the powder mixing barrel. The arrangement of all the powder barrels is redesigned, old powder and new powder need to be screened through the vibrating screen, coarse particles are prevented from entering mixed powder, the purity of the mixed powder and more recycling times are guaranteed, and the surface quality of printed and formed parts is guaranteed.

Description

[0001] This application is a divisional application with an application date of March 17, 2020, application number 202010187350.9, and invention name “An additively manufactured product and powder processing system and its working method”. Technical Field

[0002] The present invention relates to a powder processing system for additive manufacturing and a working method thereof. Background Art

[0003] Existing industrial-grade 3D printers for laser sintering additive manufacturing systems require all the discrete equipment required, including a powder lift cart, powder cleaning platform, powder adding bucket, ejector mechanism, powder sifter, recovery, waste, and new powder buckets, powder mixer, powder feeder, powder weigher, and dust collector. Furthermore, the plastic powder used is an ultrafine, highly fluid powder with particle sizes typically ranging from 10 to 100 μm. Currently, operators manually transfer powder from one container to another to complete the process of powder recovery, new powder addition, powder mixing, and powder addition to the main molding equipment. This powder turnover process can lead to powder contamination, moisture absorption and hydrolysis, dust generation, and container bottom leakage. This results in significant shortcomings, including large floor space requirements, environmental pollution, high raw material loss, high labor intensity, and low efficiency.

[0004] On November 20, 2017, the applicant applied for a Chinese invention patent application entitled "An Additively Manufactured Plastic Product and Powder Processing System and Working Method thereof" with patent number ZL 201711200333.9. The technical solution of this patent application has the following technical problems: 1. It is large in size and occupies a large area; 2. If the new powder used for mixing powder has not been screened, the large particles formed by the agglomeration of fine powder during transportation cannot be screened out, resulting in large particles mixed into the mixed powder, affecting the printing stability and the surface effect of the printed product; 3. When the old powder barrel is full, it cannot be sent out of the machine, affecting the subsequent process; 4. The powder feeding efficiency is low, the amount of compressed air consumed is large, and the noise is loud; 5. When the wrong powder is added to the feeding bucket, it cannot be removed outside the machine.

[0005] The present invention is made based on this situation. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a powder processing system for additive manufacturing and a working method thereof which has a smaller volume, better mixed powder and is cleaner.

[0007] The present invention is achieved through the following technical solutions: A powder processing system for additive manufacturing, characterized in that: it includes a powder cleaning cabinet 1, a powder cleaning table 12 is provided in the powder cleaning cabinet 1, a forming barrel 2 is placed on one side below the powder cleaning table 12, and the forming barrel 2 is filled with used old powder, a vibrating screen 9 for screening old powder or new powder is provided on the other side below the powder cleaning table 12, a feeding bucket 4 for receiving the screened powder is provided below the vibrating screen 9, a dust collection cabinet 13 is provided outside the powder cleaning cabinet 1 and is connected to the powder cleaning cabinet 1, and a dust collection cabinet 13 is provided inside the dust collection cabinet A dust suction device is provided on the outside of the powder cleaning cabinet 1. A recovery powder barrel 3, a powder mixing barrel 6, a first quantitative powder feeding pump 18, and a second quantitative powder feeding pump 19 are provided. A powder mixing device for fully mixing new powder and old powder is provided in the powder mixing barrel 6. The first quantitative powder feeding pump 18 is provided with a first conveying pipe and a first output pipe. The first conveying pipe is connected to the feeding barrel 4, and the first output pipe is connected to the powder mixing barrel 6. The second quantitative powder feeding pump 19 is provided with a second conveying pipe and a second output pipe. The second conveying pipe is connected to the recovery powder barrel 3, and the second output pipe is connected to the powder mixing barrel 6.

[0008] The powder processing system for additive manufacturing as described above is characterized in that: a movable barrel bottom 201 that can be raised and lowered is provided at the bottom of the forming barrel 2, a lower locking mechanism 8 for locking the movable barrel bottom 201 is provided below the movable barrel bottom 201, a lifting device 7 for driving the movable barrel bottom 201 and the lower locking mechanism 8 to rise and fall is provided below the movable barrel bottom 201, and an upper locking mechanism 5 is provided on the outside of the forming barrel 2 for locking the forming barrel 2 when the top surface of the forming barrel 2 rises to be flush with the powder cleaning platform 12.

[0009] The powder processing system for additive manufacturing as described above is characterized in that: two guide columns 16 are provided in the powder cleaning cabinet 1, and a fixed seat 17 is sleeved on the guide column 16, the lower locking mechanism 8 is fixedly connected to the fixed seat 17, and the lifting device 7 includes a hydraulic pump 701 provided in the powder cleaning cabinet 1, and a hydraulic cylinder 702 driven by the hydraulic pump 701, the piston rod of the hydraulic cylinder 702 is fixedly connected to the vertical rod 703, and a cross bar 705 is fixed to the top of the vertical rod 703, and movable pulleys 704 are respectively provided at both ends of the cross bar 705, and a chain 706 is wound around the movable pulley 704, one end of the chain 706 is fixed to the bottom of the powder cleaning cabinet 1, and the other end is fixed to the fixed seat 17.

[0010] The powder processing system for additive manufacturing as described above is characterized in that two motors 10 are provided in the dust collection cabinet 13 , and the dust collection device is driven by the two motors 10 to collect dust.

[0011] The additive manufacturing powder processing system as described above, characterized in that: a control cabinet 11 is arranged beside the powder cleaning cabinet 1, the recycling powder barrel 3, the mixed powder barrel 6, the first quantitative powder feeding pump 18 and the second quantitative powder feeding pump are arranged in the control cabinet 11, the recycling powder barrel 3 is arranged above the mixed powder barrel 6, a third quantitative powder feeding pump 20 is further arranged in the control cabinet 11, a third conveying pipe and a third output pipe are arranged on the third quantitative powder feeding pump 20, the third conveying pipe is connected to the mixed powder barrel 6, and the third output pipe is connected to the sintering forming machine.

[0012] The additive manufacturing powder processing system as described above, characterized in that: the end of the first output pipe is divided into three branch pipes, including a first branch pipe, a second branch pipe and a third branch pipe, the first branch pipe is connected to the mixed powder barrel 6, the second branch pipe is connected to the recycling powder barrel 3, and the third branch pipe is connected to the powder storage barrel; the end of the third output pipe is divided into at least two branch pipes, including a fourth branch pipe and a fifth branch pipe, and the fourth branch pipe and the fifth branch pipe are respectively connected to different sintering forming machines.

[0013] The additive manufacturing powder processing system as described above, characterized in that: a plurality of mesh holes 14 in communication with the vibrating screen 9 are arranged on the powder cleaning table 12, and the powder cleaning cabinet 1 and the dust collection cabinet 13 are separated by a mesh plate 15.

[0014] A working method of the additive manufacturing powder processing system as described above, characterized in that: After the powder in the forming barrel 2 is laser sintered and formed by the sintering forming machine, the forming barrel 2 is moved out to the powder cleaning cabinet 1, the dust collection device is started, and after the sintered product and the powder in the forming barrel 2 are further cooled to a safe contact temperature at room temperature, the movable barrel bottom 201 of the forming barrel 2 is upwardly pushed by the lifting device 7 to push out the sintered product and the caked powder in the forming barrel 2, the powder is manually pushed to the powder cleaning table 12 for recycling, the useful workpiece is separated after the powder on the surface is removed, the excess old powder is shaken and broken by the vibrating screen 9 and then falls into the feeding barrel 3, the old powder in the feeding barrel 4 is completely conveyed to the recycling powder barrel 3 by the first quantitative powder feeding pump 18 through the second branch pipe, and if the recycling powder barrel 3 cannot accommodate the old powder in the feeding barrel 4, the old powder in the feeding barrel 4 can also be conveyed to the powder storage barrel by the first quantitative powder feeding pump 18 through the third branch pipe. After the old powder in the feeding barrel 4 is emptied, new powder is poured into the powder cleaning table 12, and the new powder is shaken and broken by the vibrating screen 9 and then falls into the feeding barrel 4. The new powder in the feeding barrel 4 is quantitatively conveyed to the mixed powder barrel 6 by the first quantitative powder feeding pump 18 through the first branch pipe, the old powder in the recycling powder barrel 3 is quantitatively conveyed to the mixed powder barrel 6 by the second quantitative powder feeding pump, the old powder and the new powder in the mixed powder barrel 6 are quantitatively and fully mixed by the powder mixing device to form mixed powder, and the mixed powder is further conveyed to different sintering forming machines by the third quantitative powder feeding pump 20 for laser sintering. After sintering is completed, the forming barrel 2 is transferred to the powder cleaning cabinet 1, and the above steps are repeated to reuse the old powder in the forming barrel 2.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This invention redesigns the layout of the powder hoppers, reducing the cabinet volume by approximately half compared to existing designs, significantly reducing floor space. A feed hopper is now located below the vibrating screen, and both old and new powders are screened through the vibrating screen, eliminating coarse particles from entering the mixed powder, ensuring the purity of the mixed powder and increasing its reusability. This also effectively addresses the issue of new powder agglomeration during transportation, which can affect printing stability and ensure the surface quality of printed parts.

[0016] 2. The present invention adopts two motors to drive dust removal, which greatly improves the dust removal effect and ensures a healthy working environment for workers.

[0017] 3. The present invention adopts a pneumatic hydraulic pump to drive the movable barrel bottom to rise and fall, thereby avoiding the possibility of dust explosion caused by electric sparks generated by the motor, thereby ensuring the production safety of workers.

[0018] 4. This invention adds an external powder storage hopper and optimizes pipeline control. If excessive recyclable powder accumulates in the feeding hopper, delaying the production process, it can be removed to the external powder storage hopper through control components. This structure also prevents the problem of incorrect powder being unable to be discharged outside the machine. If the customer accidentally adds the wrong powder to the feeding hopper, this function can be selected to remove the problematic powder to the device's external powder storage hopper, preventing the wrong powder from being added to the mixing hopper.

[0019] 5. The present invention solves the problem of multiple devices sharing a powder processing unit by precisely controlling the powder feeding path and time through the control of the design software. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This invention is a three-dimensional schematic diagram Figure 1 ; Figure 2 This invention is a three-dimensional schematic diagram Figure 2 , some parts are hidden in the figure; Figure 3 This invention is a three-dimensional schematic diagram Figure 3 , some parts are further hidden in the figure; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is a three-dimensional diagram of the forming barrel of the present invention and the upper locking mechanism thereon; Figure 6 It is a three-dimensional diagram of the lower locking mechanism on the forming barrel of the present invention.

[0021] In the figure: 1 is a powder cleaning cabinet; 2 is a forming barrel; 201 is a movable barrel bottom; 3 is a powder recovery barrel; 4 is a feeding barrel; 5 is an upper locking mechanism; 6 is a powder mixing barrel; 7 is a lifting device; 701 is a hydraulic pump; 702 is a hydraulic cylinder; 703 is a vertical rod; 704 is a movable pulley; 705 is a horizontal rod; 706 is a chain; 8 is a lower locking mechanism; 9 is a vibrating screen; 10 is a motor; 11 is a control cabinet; 12 is a powder cleaning table; 13 is a dust collection cabinet; 14 is a mesh; 15 is a mesh plate; 16 is a guide column; 17 is a fixed seat; 18 is a first quantitative powder feeding pump; 19 is a second quantitative powder feeding pump; 20 is a third quantitative powder feeding pump. DETAILED DESCRIPTION

[0022] The technical features of the present invention are further described in detail below with reference to the accompanying drawings so that those skilled in the art can understand them.

[0023] A powder handling system for additive manufacturing, such as Figure 1 and Figure 6 As shown, it includes a powder cleaning cabinet 1, a powder cleaning table 12 is provided in the powder cleaning cabinet 1, and a molding barrel 2 is placed on one side below the powder cleaning table 12. The molding barrel 2 is filled with used old powder. The molding barrel 2 is transferred from the laser sintering molding machine and contains products molded after laser sintering and excess old powder. The old powder remaining after laser sintering molding is easily affected by moisture and agglomerates. Qualified old powder must be screened out and then fully mixed with new powder before it can be reused, otherwise it will seriously affect the surface roughness and strength of the molded product.

[0024] A vibrating screen 9 for screening old or new powder is provided on the other side below the powder cleaning table 12. A feeding bucket 4 for receiving the screened powder is provided below the vibrating screen 9. A dust collection cabinet 13 connected to the powder cleaning cabinet 1 is provided outside the powder cleaning cabinet 1. A dust collection device is provided within the dust collection cabinet 13. Furthermore, a recovery powder bucket 3, a powder mixing bucket 6, a first quantitative powder feeding pump 18, and a second quantitative powder feeding pump 19 are provided outside the powder cleaning cabinet 1. The powder mixing bucket 6 is provided with a powder mixing device for thoroughly mixing new and old powder. The first quantitative powder feeding pump 18 is provided with a first conveying pipe and a first output pipe, the first conveying pipe being connected to the feeding bucket 4 and the first output pipe being connected to the powder mixing bucket 6. The second quantitative powder feeding pump 19 is provided with a second conveying pipe and a second output pipe, the second conveying pipe being connected to the recovery powder bucket 3 and the second output pipe being connected to the powder mixing bucket 6. The first conveying pipe and the first output pipe, the second conveying pipe, and the second output pipe are not shown in the figure.

[0025] The structures of the vibrating screen 9, the powder mixing device and the dust collecting device are detailed in the patent previously applied for by the applicant, the patent number of which is ZL 201711200333.9, and the patent name is "An additively manufactured plastic product and powder processing system and its working method".

[0026] The present invention places the powder recovery barrel 3 above the powder mixing barrel 6, making the arrangement more compact and reducing the volume of the cabinet by about half compared to the original design. The new design also rearranges the functions of each powder barrel. The vibrating screen 9 is replaced with a feeding barrel 4. The old powder is crushed and screened by the vibrating screen 9 and then falls into the feeding barrel 4. After that, the old powder in the feeding barrel 4 is completely transported to the powder recovery barrel 3 through the first delivery pump 18. The new powder is then poured into the vibrating screen 9 and then crushed and screened and then falls into the feeding barrel 4. Both the old powder and the new powder need to be screened by the vibrating screen to prevent coarse particles from entering the mixed powder, thereby ensuring the purity of the mixed powder and more recycling times. This can effectively solve the problem that the new powder has not passed through the powder screening machine, resulting in large particles formed during transportation and unable to be screened out, affecting the product effect.

[0027] In the powder processing system for additive manufacturing as described above, a movable barrel bottom 201 capable of being raised and lowered is provided at the bottom of the forming barrel 2, and a lower locking mechanism 8 for locking the movable barrel bottom 201 is provided below the movable barrel bottom 201. Figure 5 As shown, a lifting device 7 for driving the movable barrel bottom 201 and the lower locking mechanism 8 to move up and down is provided below the movable barrel bottom 201. Figure 4 As shown, an upper locking mechanism 5 is provided on the outside of the molding barrel 2 for locking the molding barrel 2 when the top surface of the molding barrel 2 rises to be flush with the powder cleaning platform 12. Figure 6 shown.

[0028] The structure of the lower locking mechanism 8 includes at least two embodiments, wherein the embodiment 1 is shown in the appendix of this patent application specification. Figure 5 The structural description can be found in the patent previously applied for by the applicant, the application number of which is 201520294968.X, and the patent name is "A laser powder sintering molding machine with a liftable barrel bottom". The figure of the second embodiment can be found in the appendix of the specification of the patent number ZL201711200333.9, and the patent name is "A plastic product and powder processing system for additive manufacturing and its working method". Figure 2 .

[0029] The structural description of the upper locking mechanism 5 can refer to the patent previously applied for by the applicant, the application number of which is 201520294970.7, and the patent name is "A laser powder sintering molding machine with a locking barrel function".

[0030] As described above, the powder processing system for additive manufacturing is provided with two guide columns 16 in the powder cleaning cabinet 1, and a fixed seat 17 is sleeved on the guide columns 16. The lower locking mechanism 8 is fixedly connected to the fixed seat 17. The lifting device 7 includes a hydraulic pump 701 provided in the powder cleaning cabinet 1 and a hydraulic cylinder 702 driven by the hydraulic pump 701. The piston rod of the hydraulic cylinder 702 is fixedly connected to a vertical rod 703, and a cross bar 705 is fixed to the top of the vertical rod 703. The two ends of the cross bar 705 are respectively provided with movable pulleys 704, and a chain 706 is wound around the movable pulley 704. One end of the chain 706 is fixed to the bottom of the powder cleaning cabinet 1, and the other end is fixed to the fixed seat 17.

[0031] The use of chain 706 and movable pulley 704 can reduce the stroke and save more effort. This patent does not use a motor to drive the lifting of the movable barrel bottom 201, mainly because the electric sparks generated by the motor are likely to cause dust explosions. Instead, the hydraulic cylinder 702 drives the chain to drive the fixed seat 17 to rise and fall, and the movable barrel bottom 201 and the lower locking mechanism 8 thereon rise and fall together with the fixed seat 17.

[0032] In the additive manufacturing powder processing system described above, the dust collection cabinet 13 is equipped with two motors 10, and the dust collection device is driven by these two motors 10. Compared to the original single motor, the dual motors provide better exhaust and dust removal. Furthermore, the original metal suction hood has been upgraded to a transparent organic glass interior with conductive material, which improves the machine's aesthetics and reduces the risk of dust explosions caused by static electricity accumulation.

[0033] As described above, the powder processing system for additive manufacturing is provided with a control cabinet 11 next to the powder cleaning cabinet 1, and the recovery powder barrel 3, the powder mixing barrel 6, the first quantitative powder feeding pump 18 and the second quantitative powder feeding pump 19 are arranged in the control cabinet 11. The recovery powder barrel 3 is arranged above the powder mixing barrel 6. A third quantitative powder feeding pump 20 is also provided in the control cabinet 11, and a third conveying pipe and a third output pipe are provided on the third quantitative powder feeding pump 20. The third conveying pipe is connected to the powder mixing barrel 6, and the third output pipe is connected to the sintering molding machine. The third conveying pipe and the third output pipe are not drawn in the figure.

[0034] Furthermore, the end of the first output pipe is divided into three branch pipes, including a first branch pipe, a second branch pipe and a third branch pipe. The first branch pipe is connected to the powder mixing barrel 6, the second branch pipe is connected to the powder recovery barrel 3, and the third branch pipe is connected to the powder storage barrel. Each metering pump is provided with a metering module to control the entire powder mixing and powder delivery process with high precision.

[0035] The first, second and third quantitative powder feeding pumps 18, 19 and 20 are diaphragm pumps, which can effectively solve the problems of large gas consumption, low efficiency and large noise of the original powder pump, and the redesigned powder pump has obviously improved powder feeding efficiency and further improved reliability.

[0036] In this way, the old powder in the feeding barrel 4 can be transported to the recycled powder barrel 3 through the second branch pipe, which does not need to be quantitatively transported, and is manually controlled to be completely transported. If the recycled powder barrel 3 cannot be filled, the old powder in the feeding barrel 4 can be transported to the storage powder barrel through the third branch pipe. The existing design cannot send the old powder in the feeding barrel 4 out of the machine, which will affect the subsequent work flow. Therefore, the external storage powder barrel is added and the pipeline control is optimized, so that the old powder in the feeding barrel 4 can be temporarily stored in the external storage powder barrel through the control component in the case that the old powder accumulates too much to delay the production process.

[0037] The old powder in the recycled powder barrel 3 and the new powder in the feeding barrel 4 need to be quantitatively transported to the powder mixing barrel 6 and then gradually mixed.

[0038] The end of the third output pipe is divided into at least two branch pipes, including a fourth branch pipe and a fifth branch pipe, and the fourth branch pipe and the fifth branch pipe are connected to different sintering forming machines. The present application can realize automatic powder feeding and mixing process through automatic control program, and support powder feeding of at least two devices, which can greatly reduce the labor intensity of the operator.

[0039] The additive manufacturing powder processing system as described above is provided with a plurality of mesh holes 14 in communication with the vibrating screen 9 on the powder cleaning table 12, and the old powder or the new powder is poured into the vibrating screen 9 through the mesh holes 14. The powder cleaning cabinet 1 and the dust collection cabinet 13 are separated by a mesh plate 15.

[0040] The present application also claims a working method of the additive manufacturing powder processing system as described above, which is as follows: After the powder in the forming barrel 2 is laser sintered and formed by the sintering forming machine, the forming barrel 2 is moved out to the powder cleaning cabinet 1, the dust collection device is turned on, and after the sintered product and the powder in the forming barrel 2 are further cooled to a safe contact temperature at room temperature, the movable barrel bottom 201 of the forming barrel 2 is upwardly pushed by the lifting device 7 to push out the sintered product and the caked powder in the forming barrel 2, and the powder is manually pushed to the powder cleaning table 12 for recycling. The useful workpiece is separated after the surface powder is removed, the excess old powder is shaken and broken by the vibrating screen 9 and then falls into the feeding barrel 3, and the old powder in the feeding barrel 4 is quantitatively transported to the recycled powder barrel 3 through the first quantitative powder feeding pump 18 and the second branch pipe. If the recycled powder barrel 3 cannot be filled with the old powder in the feeding barrel 4, the old powder in the feeding barrel 4 can also be transported to the storage powder barrel through the first quantitative powder feeding pump 18 and the third branch pipe. After the old powder in the feeding bucket 4 is emptied, new powder is poured into the powder cleaning platform 12, and the new powder falls into the feeding bucket 4 after being crushed by the vibrating screen 9.

[0041] The new powder in the feeding bucket 4 is quantitatively transported to the powder mixing bucket 6 through the first branch pipe by the first quantitative powder feeding pump 18, and the old powder in the recovery powder bucket 3 is quantitatively transported to the powder mixing bucket 6 by the second quantitative powder feeding pump 19. The old powder and the new powder in the powder mixing bucket 6 are quantitatively and fully mixed by the powder mixing device to form mixed powder. The mixed powder is further transported to different sintering molding machines by the third quantitative powder feeding pump 20 for laser sintering. After sintering is completed, the molding barrel 2 is transferred to the powder cleaning cabinet 1, and the above steps are repeated to reuse the old powder in the molding barrel 2.

[0042] The embodiments described in the present invention are merely descriptions of the preferred implementation methods of the present invention and are not intended to limit the concept and scope of the invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the scope of protection of the present invention.

Claims

1. A powder processing system for additive manufacturing, characterized by: include: A powder cleaning cabinet (1), wherein a powder cleaning table (12) is provided in the powder cleaning cabinet (1); A vibrating screen (9) for screening old powder or new powder, which is arranged on one side below the powder cleaning platform (12); A feeding bucket (4) for receiving the screened powder, which is located below the vibrating screen (9); A powder recovery barrel (3) is provided outside the powder cleaning cabinet (1), and the powder recovery barrel (3) is connected to the feeding barrel (4); and A powder mixing barrel (6) is provided with a powder mixing device for fully mixing new powder and old powder in the powder mixing barrel (6), and the powder mixing barrel (6) is connected to the powder recovery barrel (3) and the feeding barrel (4) respectively.

2. The powder processing system for additive manufacturing according to claim 1, characterized in that: The invention also includes a first quantitative powder feeding pump (18) and a second quantitative powder feeding pump (19), wherein the first quantitative powder feeding pump (18) is provided with a first conveying pipe and a first output pipe, wherein the first conveying pipe is connected to the feeding bucket (4), and a first branch pipe and a second branch pipe are provided at the end of the first output pipe, wherein the first branch pipe is connected to the powder mixing bucket (6), and the second branch pipe is connected to the powder recovery bucket (3), and the second quantitative powder feeding pump (19) is provided with a second conveying pipe and a second output pipe, wherein the second conveying pipe is connected to the powder recovery bucket (3), and the second output pipe is connected to the powder mixing bucket (6).

3. The powder processing system for additive manufacturing according to claim 2, characterized in that: The invention also includes a third quantitative powder feeding pump (20), on which a third delivery pipe and a third output pipe are provided. The third delivery pipe is connected to the powder mixing barrel (6), and the third output pipe is connected to the sintering molding machine. The powder recovery barrel (3) is provided above the powder mixing barrel (6).

4. The powder processing system for additive manufacturing according to claim 2, characterized in that: A third branch pipe is further provided at the end of the first output pipe, and the third branch pipe is connected to the powder storage barrel.

5. The powder processing system for additive manufacturing according to claim 2, characterized in that: A fourth branch pipe and a fifth branch pipe are provided at the end of the third output pipe, and the fourth branch pipe and the fifth branch pipe are respectively connected to different sintering molding machines.

6. A method for operating a powder processing system for additive manufacturing according to any one of claims 1 to 5, characterized in that: After the powder in the forming barrel is laser sintered and formed by the sintering molding machine, the forming barrel is moved out to the powder cleaning cabinet, and the dust collection device is turned on to allow the sintered product and powder in the forming barrel to further cool down to a safe contact temperature at room temperature. Then, the lifting device pushes the movable barrel bottom of the forming barrel upward to push out the sintered product and agglomerated powder in the forming barrel. The powder is manually pushed to the powder cleaning table for recovery. The useful workpiece is separated by cleaning the powder on the surface, and the excess old powder is crushed by the vibrating screen and falls into the feeding bucket. Transporting the old powder in the feeding bucket to the powder recovery bucket; After the old powder in the feeding bucket is emptied, new powder is poured into the powder cleaning table, and the new powder is crushed by the vibrating screen and falls into the feeding bucket; The new powder in the feeding bucket is quantitatively transported to the powder mixing bucket; quantitatively transporting the old powder in the powder recovery barrel to the powder mixing barrel; The old powder and the new powder in the powder mixing barrel are quantitatively and fully mixed by the powder mixing device to form mixed powder; The mixed powder is transported to the sintering machine for laser sintering; After sintering is completed, the forming barrel is transferred to the powder cleaning cabinet; and Repeat the above steps to reuse the old powder in the molding barrel.

7. The working method according to claim 6, characterized in that: The powder processing system further includes a first quantitative powder feeding pump and a second quantitative powder feeding pump, the first quantitative powder feeding pump is provided with a first conveying pipe and a first output pipe, the first conveying pipe is connected to the feeding bucket, the end of the first output pipe is provided with a first branch pipe and a second branch pipe, the first branch pipe is connected to the powder mixing bucket, and the second branch pipe is connected to the recovery powder bucket, the second quantitative powder feeding pump is provided with a second conveying pipe and a second output pipe, the second conveying pipe is connected to the recovery powder bucket, and the second output pipe is connected to the mixing powder bucket, in the step: the old powder in the feeding bucket is conveyed to the recovery powder bucket, the old powder in the feeding bucket is conveyed to the recovery powder bucket by the first quantitative powder feeding pump through the second branch pipe, In the step: the new powder in the feeding bucket is quantitatively delivered to the powder mixing bucket, and the new powder in the feeding bucket is quantitatively delivered to the powder mixing bucket through the first quantitative powder delivery pump and the first branch pipe. In the step: the used powder in the recovered powder barrel is quantitatively transported to the powder mixing barrel, and the used powder in the recovered powder barrel is quantitatively transported to the powder mixing barrel by the second quantitative powder feeding pump.

8. The working method according to claim 7, characterized in that: The powder processing system further includes a third quantitative powder feeding pump, on which a third delivery pipe and a third output pipe are provided. The third delivery pipe is connected to the powder mixing barrel, and the third output pipe is connected to the sintering molding machine. In the step: the mixed powder is transported to the sintering molding machine, and the mixed powder is transported to the sintering molding machine by the third quantitative powder feeding pump.

9. The working method according to claim 8, characterized in that: The end of the third output pipe is provided with a fourth branch pipe and a fifth branch pipe, and the fourth branch pipe and the fifth branch pipe are respectively connected to different sintering molding machines. In the step: the mixed powder is transported to a sintering molding machine, and the mixed powder is transported to different sintering molding machines respectively through the third quantitative powder feeding pump and the fourth branch pipe and the fifth branch pipe.

10. The working method according to claim 7, characterized in that: A third branch pipe is also provided at the end of the first output pipe, and the third branch pipe is connected to the powder storage barrel. The working method further includes the steps of: if the recovery powder barrel cannot hold the old powder in the feeding barrel, the old powder in the feeding barrel is transported to the powder storage barrel through the third branch pipe by the first quantitative powder feeding pump (18).

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