Metal powder recovery device for additive manufacturing

Abstract

The metal powder recovery device for additive manufacturing comprises a sealing bin and a pneumatic vibrator arranged outside the sealing bin, a clamping assembly used for clamping a base plate is arranged in an inner cavity of the sealing bin, and a screening plate used for screening powder is fixed to the bottom of the sealing bin; and the inner cavity, located below the screening plate, of the sealing bin is provided with a recycling barrel, and the inner cavity, located on one side of the screening plate, of the sealing bin communicates with a recycling pipeline used for outputting large-particle powder. According to the metal powder recovery device for additive manufacturing, air flow circulation from top to bottom is formed in the sealing bin through continuous and repeated air suction and blowing operation, air above can be filtered out of the screening plate, attached powder can be cleaned, meanwhile, suspended powder in the air can be effectively treated, and the recovery efficiency of the metal powder is improved. And under positive and negative pressure, the suction force is strong, the blown airflow force is large, and powder bonding can be effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of metal powder recovery, and in particular to a metal powder recovery device for additive manufacturing. Background Art

[0002] Additive manufacturing, also known as 3D printing, is a technology that uses CAD design data to manufacture physical parts by accumulating materials layer by layer. Compared with traditional material removal (cutting) technology, it is a "bottom-up" material accumulation manufacturing method. Compared with traditional manufacturing technology, additive manufacturing has the advantages of being able to form parts with complex shapes, high molding accuracy, and saving materials.

[0003] The molding materials of additive manufacturing can be divided into three categories according to their different forms: powder materials, linear materials and liquid materials. Powder molding materials include metal powders, ceramic powders, polyethylene and other polymer powder materials. Powder materials are conducive to the precision molding of additive manufacturing, and the materials can be recycled. They are widely used in additive manufacturing methods such as laser selective melting, laser selective sintering, and electron beam selective melting.

[0004] According to the device for recovering residual powder on a metal additive manufacturing substrate described in patent number CN204975339U, the following problems exist during use:

[0005] (1) Simply blowing air can easily increase the internal air pressure and cause powder to splash. After cleaning, the powder can easily fly up again and adhere to the side wall.

[0006] (2) It is necessary to wait until the dust floating in the inert gas settles, which takes a long time. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a metal powder recovery device for additive manufacturing, which solves the above-mentioned problems.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a metal powder recovery device for additive manufacturing, comprising a sealed bin and a pneumatic vibrator arranged outside the sealed bin, the inner cavity of the sealed bin is provided with a clamping assembly for clamping a substrate, a screening plate for screening powder is fixed to the bottom of the sealed bin, and a recovery cylinder is provided in the inner cavity of the sealed bin below the screening plate, and the inner cavity of the sealed bin located on one side of the screening plate is connected to a recovery pipeline for outputting large-particle powder;

[0009] A circulation component is arranged outside the sealed chamber; the circulation component is connected to the sealed chamber through an air intake component and an air extraction component respectively;

[0010] The air intake assembly is arranged above the clamping assembly, and the air intake assembly comprises an air blowing hopper fixed in the inner cavity of the sealing chamber, and a plurality of air blowing ports with different angles are opened on the surface of the air blowing hopper;

[0011] The circulation component includes a sealing cylinder fixed on the outside of the sealing chamber, the inner cavity of the sealing cylinder is slidably connected with a sealing plug driven by a cylinder, the top of the sealing cylinder is connected with a one-way air outlet pipeline connected with the air blowing hopper, the bottom of the one-way air outlet pipeline is connected with the top of the sealing plug through a telescopic pipeline, and one side of the sealing cylinder is connected with a one-way air extraction pipeline connected with the side of the sealing chamber;

[0012] The exhaust component includes a sealing elastic belt wrapped around the connection port between the sealing chamber and the one-way exhaust pipe. One side of the sealing elastic belt is fixedly connected to a filter plate that is rotatably connected to the inner cavity of the sealing chamber. After the additive manufacturing is completed, the substrate is removed; the substrate is fixed on the clamping component, and then an inert protective gas is introduced into the sealed chamber. When the oxygen content concentration is lower than 0.8%, the pneumatic vibrator is turned on to drive the clamping component and the screening plate to vibrate respectively. The recyclable powder falls under the screening plate and is recovered through the recovery cylinder. The sealing cover plate is rotated to open it, and then the cylinder is started to drive the sealing plug to move up and down in the sealing cylinder to form a positive pressure. and negative pressure environment. When a negative pressure environment is formed, the inert gas inside the sealed chamber is pumped into the sealed cylinder through the one-way exhaust pipe. Then, when a positive pressure is formed, the inert gas is transported to the blowing bucket along the telescopic pipe and the one-way air outlet pipe, and is pressurized and ejected through the blowing ports at multiple angles on the surface of the blowing bucket. The residual powder that cannot be shaken off by vibration is blown away with the high-pressure inert gas, and the powder attached to the inner wall of the sealed chamber 1 is blown away; the residual powder that is shaken off and blown off falls on the screening plate, and the powder that can be recycled falls into the recovery cylinder, and the cylinder is continuously lifted and lowered, and the suction and blowing operations are continuously repeated, forming a top-to-bottom vacuum in the sealed chamber. The airflow circulation can filter the air above through the screening plate, and can effectively deal with the powder suspended in the air while cleaning the attached powder. Under positive and negative pressure, the suction force is strong, and the airflow is strong, which can effectively prevent the powder from sticking. In addition, through the setting of the filter plate, when the sealing plug moves intermittently, it will drive the filter plate to vibrate, and the powder adhered to the surface of the filter plate can be shaken off to the top of the screening plate below. The sealing elastic belt can ensure the sealing effect of the filter plate. When vacuuming, it can automatically perform anti-blocking cleaning, which has a longer service life. The two connecting frames can be connected according to needs. It is clamped on the surface of the sealed bin by bolt locking. At this time, the two semicircular guide rails are connected to form a circular track, and then the motor drives the walking wheel to drive the mobile frame to move and adjust the position. After moving to the fixed position, the cam is driven to rotate, and the convex surface of the cam surface hits the surface of the sealed bin, driving the local vibration of the sealed bin, and shaking off the powder adhered to the inner wall. When the powder can be processed, the sealed bin is prevented from being vibrated as a whole. Single-point vibration effectively reduces damage to the sealed bin and has a better vibration effect. When the powder vibration screening is completed, the pneumatic vibrator is turned off, the large-particle powder is recovered through the recovery pipe, and the substrate is taken out.

[0013] As a further solution of the present invention: one side of the filter plate is fixedly connected to the inner cavity of the sealing chamber by a pull rope, and a reset spring is fixedly connected to one side of the filter plate, and one end of the reset spring is fixedly connected to the inner cavity of the sealing chamber. The filter plate is connected by the reset spring, and can be reset when it loses external force. The rotation angle of the filter plate is limited by the pull rope to prevent excessive rotation from pulling the sealing elastic belt and causing sealing failure.

[0014] As a further solution of the present invention: the vibration components of the pneumatic vibrator are respectively in contact with the screening plate and the clamping component, and the screening plate and the clamping component are driven to vibrate by the pneumatic vibrator to shake off and screen the powder.

[0015] As a further solution of the present invention: the inner cavity of the sealing chamber is rotatably connected to a sealing cover plate driven by a motor, and the sealing cover plate is located on the surface of the blowing hopper after rotating 180 degrees. When the blowing hopper is not in use, the sealing cover plate is rotated to cover the top of the blowing hopper, thereby sealing the blowing hopper and isolating it from the air inside the sealing chamber.

[0016] As a further solution of the present invention: a knocking assembly is provided on the surface of the sealed bin, and the knocking assembly includes two connecting frames that are clamped on the surface of the sealed bin by bolts, and the tops of the two connecting frames are fixedly connected with semicircular guide rails, and the surface transmission of the semicircular guide rails is connected with a moving frame driven by walking wheels, and the side rotation of the moving frame is connected with a cam driven by a motor, and the rotation trajectory of the cam convex surface coincides with the surface of the sealed bin. When in use, the two connecting frames are clamped on the surface of the sealed bin by bolts according to needs, and at this time, the two semicircular guide rails are docked to form a circular track, and then the moving wheels are driven by the motor to drive the moving frame to move and adjust the position. After moving to the fixed position, the cam is driven to rotate, and the convex surface of the cam surface hits the surface of the sealed bin, driving the local vibration of the sealed bin to shake off the powder adhered to the inner wall, and preventing the sealed bin from being vibrated as a whole when the powder can be processed. The single-point vibration effectively reduces the damage to the sealed bin, and the vibration effect is better.

[0017] As a further solution of the present invention: the two semicircular guide rails form a circular ring, and docking slots are provided at the connection points at both ends, so that assembly and disassembly are very convenient, and the position of the knocking component can be quickly adjusted.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention forms an airflow circulation from top to bottom in the sealed chamber by continuously repeating the operation of suction and blowing, and can filter the upper air through the screening plate. While being able to clean the attached powder, the powder suspended in the air can be effectively processed. Moreover, under positive and negative pressures, the suction force is strong and the airflow force is strong, which can effectively prevent the powder from sticking.

[0020] 2. The present invention drives the filter plate to vibrate when the sealing plug moves intermittently, so that the powder adhered to the surface of the filter plate can be shaken off to the top of the screening plate below, and the sealing effect of the filter plate can be ensured by the sealing elastic belt. When vacuuming, anti-clogging cleaning can be automatically performed, and the service life is longer.

[0021] 3. The present invention uses the convex surface of the cam surface to impact the surface of the sealed bin, thereby driving the sealed bin to vibrate locally and shaking off the powder adhered to the inner wall. When the powder can be processed, the sealed bin is prevented from being vibrated as a whole. The single-point vibration effectively reduces the damage to the sealed bin and has a better vibration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural cross-sectional view of the present invention;

[0024] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A;

[0025] Figure 4 For the present invention Figure 1 A partial enlarged view of point B in the middle.

[0026] In the figure: 1. Sealing chamber; 2. Blowing bucket; 3. Blowing port; 4. Sealing cover plate; 5. One-way air outlet pipe; 6. Sealing cylinder; 7. Sealing plug; 8. Telescopic pipe; 9. Cylinder; 10. One-way exhaust pipe; 11. Screening plate; 12. Pneumatic vibrator; 13. Clamping assembly; 14. Connecting frame; 15. Semicircular guide rail; 16. Moving frame; 17. Cam; 18. Filter plate; 19. Sealing elastic belt; 20. Reset spring. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] See also Figure 1-4 The present invention provides a technical solution: a metal powder recovery device for additive manufacturing, comprising a sealed bin 1 and a pneumatic vibrator 12 arranged outside the sealed bin 1, the inner cavity of the sealed bin 1 is provided with a clamping assembly 13 for clamping a substrate, a screening plate 11 for screening powder is fixed at the bottom of the sealed bin 1, and a recovery cylinder is provided in the inner cavity of the sealed bin 1 below the screening plate 11, and the inner cavity of the sealed bin 1 on one side of the screening plate 11 is connected with a recovery pipeline for outputting large-particle powder;

[0029] A circulation component is arranged outside the sealed chamber 1; the circulation component is connected to the sealed chamber 1 through an air intake component and an air extraction component respectively;

[0030] The air intake assembly is arranged above the clamping assembly 13, and the air intake assembly comprises an air blowing hopper 2 fixed in the inner cavity of the sealing chamber 1, and a plurality of air blowing ports 3 with different angles are provided on the surface of the air blowing hopper 2;

[0031] The circulation component includes a sealing cylinder 6 fixed on the outside of the sealing chamber 1, the inner cavity of the sealing cylinder 6 is slidably connected with a sealing plug 7 driven by a cylinder 9, the top of the sealing cylinder 6 is connected with a one-way air outlet pipe 5 connected with the air blowing hopper 2, the bottom of the one-way air outlet pipe 5 is connected with the top of the sealing plug 7 through a telescopic pipe 8, and one side of the sealing cylinder 6 is connected with a one-way air extraction pipe 10 connected with the side of the sealing chamber 1;

[0032] The exhaust component includes a sealing elastic belt 19 covering the connection port between the sealing chamber 1 and the one-way exhaust pipe 10. One side of the sealing elastic belt 19 is fixedly connected to a filter plate 18 rotatably connected to the inner cavity of the sealing chamber 1. After the additive manufacturing is completed, the substrate is removed; the substrate is fixed on the clamping component 13, and then an inert protective gas is introduced into the sealed chamber 1. When the oxygen content concentration is lower than 0.8%, the pneumatic vibrator 12 is turned on to drive the clamping component 13 and the screening plate 11 to vibrate respectively. The recyclable powder falls under the screening plate 11 and is recovered through the recovery cylinder. The sealing cover plate 4 is rotated to open it, and then the cylinder 9 is started to drive the sealing plug 7 to move up and down in the sealing cylinder 6. The inert gas is transported to the blowing bucket 2 along the telescopic pipe 8 and the one-way air outlet pipe 5, and is ejected after being pressurized through the blowing ports 3 at multiple angles on the surface of the blowing bucket 2, and the residual powder that cannot be shaken off by vibration is blown away with the high-pressure inert gas, and the powder attached to the inner wall of the sealed bin 1 is blown away; the residual powder shaken off and blown off falls on the screening plate 11, and the powder that can be recycled falls into the recovery barrel, and the cylinder 9 is continuously lifted and lowered, and the suction and blowing operations are continuously repeated, forming a vacuum in the sealed bin 1. The airflow circulation to the bottom can filter the air above through the screening plate 11, and can effectively process the powder suspended in the air while cleaning the attached powder. In addition, under positive and negative pressure, the suction force is strong, and the airflow blown out is strong, which can effectively prevent the powder from sticking. In addition, through the setting of the filter plate 18, when the sealing plug 7 moves intermittently, it will drive the filter plate 18 to vibrate, and the powder adhered to the surface of the filter plate 18 can be shaken off to the top of the screening plate 11 below. The sealing elastic belt 19 can ensure the sealing effect of the filter plate 18, and anti-blocking cleaning can be automatically performed when vacuuming, which has a longer service life. The two connecting frames 1 can be connected according to needs. 4 is clamped on the surface of the sealed bin 1 by bolt locking, and the two semicircular guide rails 15 are connected to form a circular track, and then the motor drives the walking wheel to drive the moving frame 16 to move and adjust the position. After moving to the fixed position, the cam 17 is driven to rotate, and the convex surface of the cam 17 hits the surface of the sealed bin 1, driving the sealed bin 1 to vibrate locally, and the powder adhered to the inner wall is shaken off. When the powder can be processed, the sealed bin 1 is prevented from being vibrated as a whole. The single-point vibration effectively reduces the damage to the sealed bin 1, and the vibration effect is better. When the powder vibration screening is completed, the pneumatic vibrator 12 is turned off, and the large-particle powder is recovered through the recovery pipeline, and the substrate is taken out.

[0033] One side of the filter plate 18 is fixedly connected to the inner cavity of the sealing chamber 1 by a pull rope 21. A reset spring 20 is fixedly connected to one side of the filter plate 18. One end of the reset spring 20 is fixedly connected to the inner cavity of the sealing chamber 1. The filter plate 18 is connected by the reset spring 20, and can be reset when it loses external force. The rotation angle of the filter plate 18 is limited by the pull rope 21 to prevent excessive rotation from pulling the sealing elastic belt 19 and causing sealing failure.

[0034] The vibrating components of the pneumatic vibrator 12 are respectively in contact with the screening plate 11 and the clamping component 13 , and the pneumatic vibrator 12 drives the screening plate 11 and the clamping component 13 to vibrate, thereby shaking off and screening the powder.

[0035] The inner cavity of the sealing chamber 1 is rotatably connected to a sealing cover plate 4 driven by a motor. The sealing cover plate 4 is rotated 180 degrees and is located on the surface of the blowing hopper 2. When the blowing hopper 2 is not in use, the sealing cover plate 4 is rotated to cover the top of the blowing hopper 2, thereby sealing the blowing hopper 2 and isolating it from the air inside the sealing chamber 1.

[0036] The surface of the sealed bin 1 is provided with a knocking assembly, which includes two connecting frames 14 that are clamped on the surface of the sealed bin 1 by bolt locking, and the tops of the two connecting frames 14 are fixedly connected with semicircular guide rails 15, and the surface of the semicircular guide rails 15 is transmission-connected with a moving frame 16 driven by walking wheels, and the side rotation of the moving frame 16 is connected with a cam 17 driven by a motor, and the rotation trajectory of the convex surface of the cam 17 coincides with the surface of the sealed bin 1. When in use, the two connecting frames 14 are clamped on the surface of the sealed bin 1 by bolt locking according to needs, at this time, the two semicircular guide rails 15 are connected to form a circular track, and then the moving frame 16 is driven by the motor to move the walking wheels to adjust the position. After moving to the fixed position, the cam 17 is driven to rotate, and the convex surface of the cam 17 hits the surface of the sealed bin 1, driving the sealed bin 1 to vibrate locally, and shaking off the powder adhered to the inner wall, preventing the sealed bin 1 from being vibrated as a whole when the powder can be processed. The single-point vibration effectively reduces the damage to the sealed bin 1, and the vibration effect is better.

[0037] The two semicircular guide rails 15 form a circular ring, and the connection points at both ends are provided with docking slots, so the assembly and disassembly are very convenient, and the position of the striking component can be quickly adjusted.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A metal powder recovery device for additive manufacturing, comprising a sealed chamber (1) and a pneumatic vibrator (12) arranged outside the sealed chamber (1), characterized in that: The inner cavity of the sealed bin (1) is provided with a clamping assembly (13) for clamping a substrate, a screening plate (11) for screening powder is fixed at the bottom of the sealed bin (1), and a recovery cylinder is provided in the inner cavity of the sealed bin (1) below the screening plate (11), and the inner cavity of the sealed bin (1) on one side of the screening plate (11) is connected to a recovery pipe for outputting large-particle powder; A circulation component is arranged outside the sealed chamber (1); the circulation component is connected to the sealed chamber (1) through an air intake component and an air extraction component respectively; The air intake assembly is arranged above the clamping assembly (13), and comprises an air blowing hopper (2) fixed in the inner cavity of the sealing chamber (1), and a plurality of air blowing ports (3) with different angles are formed on the surface of the air blowing hopper (2); The circulation component comprises a sealing cylinder (6) fixed on the outside of the sealing chamber (1); the inner cavity of the sealing cylinder (6) is slidably connected to a sealing plug (7) driven by a cylinder (9); the top of the sealing cylinder (6) is connected to a one-way air outlet pipe (5) connected to an air blowing hopper (2); the bottom of the one-way air outlet pipe (5) is connected to the top of the sealing plug (7) through a telescopic pipe (8); one side of the sealing cylinder (6) is connected to a one-way air extraction pipe (10) connected to the side of the sealing chamber (1); The air extraction component comprises a sealing elastic band (19) covering the communication port between the sealing chamber (1) and the one-way air extraction pipe (10), and a filter plate (18) rotatably connected to the inner cavity of the sealing chamber (1) is fixedly connected to one side of the sealing elastic band (19).

2. A metal powder recovery device for additive manufacturing according to claim 1, characterized in that: One side of the filter plate (18) is fixedly connected to the inner cavity of the sealing chamber (1) via a drawstring (21), and a return spring (20) is fixedly connected to one side of the filter plate (18), and one end of the return spring (20) is fixedly connected to the inner cavity of the sealing chamber (1).

3. The metal powder recovery device for additive manufacturing according to claim 1, characterized in that: The vibration components of the pneumatic vibrator (12) are respectively in contact with the screening plate (11) and the clamping component (13).

4. The metal powder recovery device for additive manufacturing according to claim 1, characterized in that: The inner cavity of the sealing chamber (1) is rotatably connected to a sealing cover plate (4) driven by a motor, and the sealing cover plate (4) is located on the surface of the blowing hopper (2) after rotating 180 degrees.

5. The metal powder recovery device for additive manufacturing according to claim 1, characterized in that: The surface of the sealing bin (1) is provided with a knocking assembly, which comprises two connecting frames (14) which are clamped on the surface of the sealing bin (1) by bolt locking, the tops of the two connecting frames (14) are fixedly connected to semicircular guide rails (15), the surface of the semicircular guide rails (15) is transmission-connected to a moving frame (16) driven by a running wheel, the side of the moving frame (16) is rotationally connected to a cam (17) driven by a motor, and the rotation trajectory of the convex surface of the cam (17) coincides with the surface of the sealing bin (1).

6. A metal powder recovery device for additive manufacturing according to claim 5, characterized in that: The two semicircular guide rails (15) form a circular ring, and the connection points at both ends are provided with docking slots.

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