3D printing old powder recovery device

Abstract

The 3D printing old powder recycling device comprises a storage bin, a feeding opening used for being communicated with an old powder discharging opening of a printing chamber is formed in the upper portion of the storage bin, and a first dispersing structure and a second dispersing structure which are sequentially installed from back to front in the feeding direction are arranged in the feeding opening; the first dispersing structure comprises a barrel, and a material channel in the axial direction of the barrel and an air channel in the radial direction of the barrel are arranged in the barrel; the second dispersing structure comprises a pipe body and a disc body, one end of the pipe body is in butt joint with the material channel, and one end of the pipe body is communicated with the disc body; an annular rotor and an annular stator are installed in the disc body, a first flow channel is formed in the rotor, a second flow channel is formed in the stator, and an outlet of the second flow channel penetrates through the disc body. Old powder passes through the first dispersing structure and the second dispersing structure, caked powder balls in powder particles are dispersed through high-speed airflow impact, then dispersed through high-speed rotating impact and discharged out of the disc body to be dispersed, and recycling is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing waste powder recovery device. Background Art

[0002] The working principle of 3D printer is basically the same as that of ordinary printers. It is controlled by computer to stack "printing materials" layer by layer, and finally turn the blueprint on the computer into a physical object. This is a technological revolution that subverts the traditional manufacturing process. It is a technology that uses a digital model file as the basis, and uses powdered metal or plastic and other bondable materials to construct objects by printing layer by layer. Therefore, when printing, a large amount of metal powder or plastic powder is sprayed out, and some printing powder will be wasted in the process of product molding.

[0003] Currently, in the actual use of 3D printers, excess printing powder will fall to the bottom of the product lifting platform and needs to be collected after a period of use. However, the collected printing powder contains block structures (agglomerated powder lumps) bonded by bonding materials. Therefore, the collected printing powder cannot be directly used in the next step, resulting in a waste of printing powder.

[0004] Therefore, the old powder needs to be broken up and screened for impurities through additional equipment before it can be recycled, which will increase labor costs and production costs, and the efficiency is not high. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a 3D printing used powder recycling device, which can effectively break up and screen the used powder particles of 3D printing so that they can be recycled and still have good finished product quality after recycling.

[0006] The purpose of the present invention is achieved by the following technical solutions: According to an embodiment of the present disclosure, a 3D printing used powder recycling device is provided, characterized in that it includes a storage bin, a feeding port for communicating with a used powder discharge port of a printing chamber is opened at the upper portion of the storage bin, and a first dispersion structure and a second dispersion structure are arranged in the feeding port and are sequentially installed from back to front along a feeding direction; The first dispersion structure includes a cylinder, in which a material channel along the axial direction of the cylinder and an air channel along the radial direction of the cylinder are arranged; both ends of the material channel penetrate the cylinder; one end of the air channel is connected to the material channel, and the other end of the air channel is connected to the hair dryer; The second dispersion structure includes a tube body and a disk body with a cavity inside, one end of the tube body is connected to the material channel, and one end of the tube body is connected to the disk body; an annular rotor and stator are installed in the disk body, wherein the rotor is located on the inner side of the stator, and a plurality of first flow channels extending along the radial direction of the rotor and penetrating the rotor at both ends are opened in the rotor, and a plurality of second flow channels extending along the radial direction of the stator and penetrating the stator at both ends are opened in the stator, and the outlet of the second flow channel penetrates the disk body; wherein a gap is provided between the outer side of the disk body and the inner side wall of the feeding port.

[0007] As a preferred solution, the air duct is connected to the middle part of the material channel, and the rear half of the material channel is funnel-shaped.

[0008] As a preferred solution, the second flow channel has a structure that gradually becomes smaller from the inside to the outside.

[0009] As a preferred solution, a heating chamber is arranged between the feeding port and the old powder discharge port of the printing chamber, and a heating tube extending in the front-to-back direction is arranged in the heating chamber. The outer side of the heating tube is provided with a flame-retardant insulation sleeve, and a heating channel is formed on the inner side of the heating tube, and the front and rear ends of the heating channel respectively pass through the two ends of the heating tube.

[0010] As a preferred solution, the flame retardant heat-insulating sleeve located at the bottom of the heating tube is provided with a receiving groove, and a heater for heating the bottom of the heating tube is arranged in the receiving groove.

[0011] As a preferred solution, the wall of the heating tube is provided with a vacuum interlayer, in which ether is provided; the middle portion of the heating tube is made of an insulating material, and the top and bottom of the heating tube are made of a heat-conducting material; wherein, when the heater does not heat the heating tube, the liquid level of the ether is lower than the lowest point of the insulating portion of the heating tube.

[0012] As a preferred solution, a corona cavity is arranged in front of the second dispersion structure, and a corona needle is arranged in the corona cavity; a connecting seat is arranged outside the corona cavity, and the corona needle is installed on the connecting seat, and the discharge end of the corona needle extends into the corona cavity through the perforation on the corona cavity.

[0013] As a preferred solution, a sieve plate is arranged in front of the corona chamber, and a plurality of sieve holes are opened on the sieve plate.

[0014] As a preferred solution, the sieve plate is circular, and is provided with a fan-shaped hole distribution area and a fan-shaped non-hole area, and the sieve holes are arranged in the hole distribution area; a blocking member is provided on the front side of the sieve plate, the blocking member is fan-shaped, and the blocking member is rotatably installed in the feeding port; wherein the area of ​​the blocking member is larger than the area of ​​the hole distribution area.

[0015] As a preferred solution, the inner wall of the feed port is provided with a mounting groove for placing the periphery of the blocking member; the blocking member includes an arc-shaped outer ring and a fan-shaped inner plate rotatably installed in the outer ring, the periphery of the outer ring is installed in the mounting groove, and the inner plate is connected to the drive motor through a transmission shaft.

[0016] In summary, compared with the prior art, the present invention has the following beneficial effects: The embodiment of the present invention provides a 3D printing old powder recycling device. When the old powder particles are processed, the old powder particles enter the storage bin from the feed port; First, the old powder particles enter the heating chamber to remove the moisture of the powder particles mixed in the air, reduce the water film on the surface of the powder particles, destroy the liquid bridge force between the powder particles, reduce the molecular force between the particles, and ensure the looseness of the powder particles; Next, the old powder particles pass through the first dispersion structure and enter the material channel. In the middle of the material channel, the agglomerated powder particles in the powder particles are dispersed by the strong turbulent motion of the air flow generated by the impact of the high-speed airflow in the air channel; then, the old powder particles pass through the second dispersion structure and enter the disc body through the tube body, and then hit the stationary stator through the first flow channel of the high-speed rotating rotor, and are discharged from the disc body through the second flow channel of the stator. In this process, the particles that stick to each other in the powder particles are forcibly dispersed; Then, the old powder particles enter the corona chamber, and the ion electric curtain formed by corona discharge makes the powder particles charged, so that the surface charge of each powder particle is the same, and the electrostatic force plays a repulsive role, preventing the powder particles from re-bonding and agglomerating after being dispersed, thus ensuring the dispersion of the particles; Finally, the completely dispersed powder particles enter the storage bin through the sieve holes of the sieve plate. Since the powder particles are fully dispersed, the sieve holes will not be blocked even after multiple screenings, thereby improving the screening efficiency and achieving effective screening of 3D printing powder particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the internal structure of the 3D printing waste powder recovery device in an embodiment of the present invention.

[0018] Figure 2 It is a transverse cross-sectional view of the heating chamber in an embodiment of the present invention.

[0019] Figure 3 It is a vertical cross-sectional view of the first dispersed structure in an embodiment of the present invention.

[0020] Figure 4 FIG. 4 is a top view of the second dispersed structure in an embodiment of the present invention.

[0021] Figure 5Schematic diagram of the corona chamber in an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the sieve plate in an embodiment of the present invention.

[0023] Figure 7 Schematic diagram of a blocking member in an embodiment of the present invention.

[0024] Figure 8 This is an external diagram of a 3D printing waste powder recycling device in an embodiment of the present invention.

[0025] The numbers and letters in the figure represent the corresponding component names: 1. Storage silo; 2. Feeding port; 21. First dispersing structure; 210. Cylinder; 211. Material channel; 212. Air channel; 22. second dispersed structure; 221. tube body; 222. disk body; 223. rotor; 224. stator; 225. first flow channel; 226. second flow channel; 23. Heating chamber; 231. Heating tube; 2310. Heating channel; 232. Flame retardant heat insulation sleeve; 233. Receiving tank; 234. Heater; 235. Ether; 24. corona chamber; 241. corona needle; 242. connecting seat; 25, sieve plate; 250, sieve hole; 251, hole distribution area; 252, non-hole area; 26. Blocking member; 261. Outer ring; 262. Inner plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example: Figures 1 to 8 As shown, a 3D printing used powder recycling device is characterized in that it includes a storage bin 1, a feeding port 2 for communicating with a used powder discharge port of a printing chamber is opened at the upper portion of the storage bin 1, and a first dispersion structure 21 and a second dispersion structure 22 are arranged in sequence from the back to the front along the feeding direction in the feeding port 2; The first dispersion structure 21 includes a cylinder 210, in which a material channel 211 along the axial direction of the cylinder 210 and an air channel 212 along the radial direction of the cylinder 210 are arranged; both ends of the material channel 211 penetrate the cylinder 210; one end of the air channel 212 is connected to the material channel 211, and the other end of the air channel 212 is connected to a hair dryer (not shown); The second dispersion structure 22 includes a tube body 221 with a cavity inside and a disk body 222, one end of the tube body 221 is connected to the material channel 211, and one end of the tube body 221 is connected to the disk body 222; an annular rotor 223 and a stator 224 are installed in the disk body 222, wherein the rotor 223 is located on the inner side of the stator 224, and a plurality of first flow channels 225 extending along the radial direction of the rotor 223 and penetrating the rotor 223 at both ends are opened in the rotor 223, and a plurality of second flow channels 226 extending along the radial direction of the stator 224 and penetrating the stator 224 at both ends are opened in the stator 224, and the outlet of the second flow channel 226 penetrates the disk body 222; wherein, there is a gap between the outer side of the disk body 222 and the inner side wall of the feeding port 2.

[0028] During implementation, the first flow channels 225 are evenly distributed along the circumference of the rotor 223 , the second flow channels 226 are evenly distributed along the circumference of the stator 224 , and the number of the first flow channels 225 is less than the number of the second flow channels.

[0029] When implemented, the rotor may be driven by a motor.

[0030] In this embodiment, the old powder particles pass through the first dispersion structure and enter the material channel. In the middle of the material channel, the agglomerated powder particles in the powder particles are dispersed by the strong turbulent motion of the air flow generated by the impact of the high-speed airflow in the air duct; then, the old powder particles pass through the second dispersion structure, and the powder particles enter the disc body through the tube body, and then hit the stationary stator through the first flow channel of the high-speed rotating rotor, and are discharged out of the disc body through the second flow channel of the stator. In this process, the particles that are adhered to each other in the powder particles are forced to be dispersed.

[0031] Specifically, the air duct 212 is connected to the middle part of the material channel 211, and the rear half of the material channel 211 is funnel-shaped, that is, the cavity of the material channel 211 is arranged to gradually become smaller from the back to the front.

[0032] In this embodiment, the active space of the powder particles in the material channel is gradually squeezed until they are impacted by the high-speed airflow of the air channel, so that the powder particles are forcibly dispersed in the first round.

[0033] Specifically, the second flow channel 226 has a structure that gradually becomes smaller from the inside to the outside.

[0034] In this embodiment, as the powder particles move from the inside of the disk to the outside of the disk, the agglomerates of the powder particles become smaller until they are completely dispersed.

[0035] Specifically, a heating chamber 23 is arranged between the feed port 2 and the used powder discharge port of the printing chamber, and a heating tube 231 extending along the front-to-back direction is arranged in the heating chamber 23. The outer side of the heating tube 231 is provided with a flame-retardant heat-insulating sleeve 232, and a heating channel 2310 is formed on the inner side of the heating tube 231. The front and rear ends of the heating channel 2310 respectively pass through the two ends of the heating tube 231.

[0036] During implementation, a switchable valve is provided on the front side of the heating chamber. The valve is made of heat-insulating material. When the heating tube heats the heating chamber, the valve is in a closed state. After the heating is completed, the valve is opened again. It should be noted that the specific structure of the valve is not the content to be protected by this application. As long as the switch can be realized, it will not be described in detail here.

[0037] The applicant has found that the surface of the powder particles is a curved surface. Due to the increase in the saturated vapor pressure of the curved surface and the effect of the unsaturated force field on the surface of the powder particles, water in the air will be adsorbed or condensed on the surface of the powder particles to form a water film. The thickness of the water film is determined by the hydrophilicity of the surface of the powder particles and the humidity of the air. The stronger the hydrophilicity of the powder particles, the greater the humidity, and the thicker the water. When the water thickness is sufficient to form a lens-shaped or ring-shaped liquid phase aggregation at the contact point of the powder particles, liquid bridge force begins to form and accelerates the aggregation of the powder particles, thereby causing the powder particles to condense into agglomerated powder masses. Therefore, a heating chamber is designed in this embodiment, and the powder particles are dried by heating to prevent the generation of liquid bridges or destroy the liquid bridges that have been formed, thereby ensuring the dispersion of the particles.

[0038] Specifically, the flame-retardant heat-insulating sleeve 232 at the bottom of the heating tube 231 is provided with a receiving groove 233 , and a heater 234 for heating the bottom of the heating tube 231 is arranged in the receiving groove 233 .

[0039] In this embodiment, the heater is arranged in the receiving groove of the flame retardant insulation sleeve. Firstly, it can reduce the pressure effect on the heater, and secondly, it can prevent the heater from heating up places other than the heating tube, thereby reducing the occurrence of fire.

[0040] Specifically, the tube wall of the heating tube 231 is provided with a vacuum interlayer, in which ether 235 is provided, that is, the tube wall of the heating tube is a double-layer wall, and there is an interlayer space between the two walls; the middle part of the heating tube 231 is made of insulating material, and the top and bottom of the heating tube 231 are made of heat-conducting material; wherein, when the heater 234 does not heat the heating tube 231, the liquid level of the ether 235 is lower than the lowest point of the insulating part of the heating tube 231.

[0041] In this embodiment, when the bottom of the heating tube is heated, the ether in the heating tube evaporates due to the heat and takes away heat, which is the latent heat of evaporation of the ether. After the steam flows upward to the top of the heating tube, it condenses into ether and releases latent heat at the same time, completing the effect of transferring heat from the bottom to the top of the heating tube, so that the entire heating tube can heat the powder particles located on the inside of the heating tube, and the heating effect is better; in addition, when the steam at the top of the heating tube condenses into ether, the ether flows back to the bottom of the heating tube under the action of gravity, completing a closed cycle, so that a large amount of heat can be repeatedly transferred from the bottom of the heating tube to the top of the heating tube.

[0042] Specifically, a corona chamber 24 is arranged in front of the second dispersion structure 22, and a corona needle 241 is arranged in the corona chamber 24; a connecting seat 242 is arranged outside the corona chamber 24, and the corona needle 241 is installed on the connecting seat 242, and the discharge end of the corona needle 241 extends into the corona chamber 24 through the perforation on the corona chamber 24.

[0043] The applicant has found that although the first dispersion structure and the second dispersion structure can disperse the powder particles well, this is a forced dispersion. In actual situations, although the powder particles that stick to each other can be broken up by the first dispersion structure and the second dispersion structure, the force between the powder particles still exists, and they may re-stick and agglomerate after being discharged from the disc. Therefore, in this embodiment, the powder particles discharged from the disc are introduced into the corona chamber, and the powder particles are charged by the ion electric curtain formed by the corona discharge, so that the surface charges of each powder particle are the same, and the electrostatic force plays a repulsive role, which prevents the powder particles from re-sticking and agglomerating after being dispersed, thereby ensuring the dispersion of the particles.

[0044] Specifically, a sieve plate 25 is disposed in front of the corona chamber 24 , and a plurality of sieve holes 250 are formed on the sieve plate 25 .

[0045] Specifically, the sieve plate 25 is circular, and is provided with a fan-shaped hole distribution area 251 and a fan-shaped non-porous area 252, and the sieve holes 250 are arranged in the hole distribution area 251; a blocking member 26 is provided on the front side of the sieve plate 25, and the blocking member 26 is fan-shaped and rotatably installed in the feeding port 2; wherein, the area of ​​the blocking member 26 is larger than the area of ​​the hole distribution area 251.

[0046] In this embodiment, the blocking member can be rotated to control whether to block the sieve holes in the hole distribution area. When corona discharge is carried out in the corona chamber, the blocking member is rotated to block the sieve holes to ensure that the powder particles can be well charged. When the corona discharge is completed, the blocking member is rotated to make the sieve holes connect the corona chamber and the storage bin to allow the powder particles to pass through.

[0047] During implementation, a vibrator (not shown) is installed on one side of the sieve plate, and the other side of the sieve plate is connected to the inner wall of the feed port via a spring (not shown). In this way, the powder particles in the non-porous area of ​​the sieve plate can be vibrated to the perforated area by vibrating the sieve plate, and then fall into the storage bin through the sieve holes.

[0048] Specifically, the inner wall of the feed port 2 is provided with a mounting groove for placing the periphery of the blocking member 26; the blocking member 26 includes an arc-shaped outer ring 261 and a fan-shaped inner plate 262 rotatably installed in the outer ring 261, the periphery of the outer ring 261 is installed in the mounting groove, and the inner plate 262 is connected to a drive motor (not shown) through a transmission shaft (not shown).

[0049] In this embodiment, the inner plate is controlled to rotate by driving the motor without driving the outer ring to rotate, thereby ensuring the installation stability of the blocking member.

[0050] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A 3D printing waste powder recycling device, characterized in that: It includes a material storage bin, the upper part of which is provided with a feeding port for communicating with the old powder discharge port of the printing chamber, and the feeding port is provided with a first dispersion structure and a second dispersion structure which are sequentially installed from the back to the front along the feeding direction; The first dispersion structure includes a cylinder, in which a material channel along the axial direction of the cylinder and an air channel along the radial direction of the cylinder are arranged; both ends of the material channel penetrate the cylinder; one end of the air channel is connected to the material channel, and the other end of the air channel is connected to the hair dryer; The second dispersion structure includes a tube body and a disk body with a cavity inside, one end of the tube body is connected to the material channel, and one end of the tube body is connected to the disk body; an annular rotor and stator are installed in the disk body, wherein the rotor is located on the inner side of the stator, and a plurality of first flow channels extending along the radial direction of the rotor and penetrating the rotor at both ends are opened in the rotor, and a plurality of second flow channels extending along the radial direction of the stator and penetrating the stator at both ends are opened in the stator, and the outlet of the second flow channel penetrates the disk body; wherein a gap is provided between the outer side of the disk body and the inner side wall of the feeding port.

2. The 3D printing waste powder recycling device according to claim 1 is characterized in that: The air duct is connected with the middle part of the material channel, and the rear half of the material channel is funnel-shaped.

3. The 3D printing waste powder recycling device according to claim 1 is characterized in that: The second flow channel is in a structure that gradually becomes smaller from the inside to the outside.

4. The 3D printing waste powder recycling device according to claim 1 is characterized in that: A heating chamber is arranged between the feeding port and the old powder discharge port of the printing chamber, and a heating tube extending in the front-to-back direction is arranged in the heating chamber. A flame-retardant heat-insulating sleeve is arranged on the outer side of the heating tube, and a heating channel is formed on the inner side of the heating tube. The front and rear ends of the heating channel respectively pass through the two ends of the heating tube.

5. The 3D printing waste powder recycling device according to claim 4 is characterized in that: The flame retardant heat-insulating sleeve at the bottom of the heating tube is provided with a receiving groove, and a heater for heating the bottom of the heating tube is arranged in the receiving groove.

6. The 3D printing waste powder recycling device according to claim 5, characterized in that: The wall of the heating tube is provided with a vacuum interlayer, in which ether is provided; the middle part of the heating tube is made of insulating material, and the top and bottom of the heating tube are made of heat-conducting material; wherein, when the heater does not heat the heating tube, the liquid level of the ether is lower than the lowest point of the insulating part of the heating tube.

7. The 3D printing waste powder recycling device according to claim 1, characterized in that: A corona cavity is arranged in front of the second dispersion structure, and a corona needle is arranged in the corona cavity; a connecting seat is arranged outside the corona cavity, and the corona needle is installed on the connecting seat, and the discharge end of the corona needle extends into the corona cavity through the perforation on the corona cavity.

8. The 3D printing waste powder recycling device according to claim 7, characterized in that: A sieve plate is arranged in front of the corona chamber, and a plurality of sieve holes are opened on the sieve plate.

9. The 3D printing waste powder recycling device according to claim 8, characterized in that: The sieve plate is circular, and is provided with a fan-shaped hole distribution area and a fan-shaped non-hole area, and the sieve holes are arranged in the hole distribution area; a blocking component is provided on the front side of the sieve plate, the blocking component is fan-shaped, and the blocking component is rotatably installed in the feeding port; wherein the area of ​​the blocking component is larger than the area of ​​the hole distribution area.

10. The 3D printing waste powder recycling device according to claim 9, characterized in that: The inner wall of the feeding port is provided with a mounting groove for accommodating the periphery of the blocking member; the blocking member comprises an arc-shaped outer ring and a fan-shaped inner plate rotatably mounted in the outer ring, the periphery of the outer ring is mounted in the mounting groove, and the inner plate is connected to the driving motor through a transmission shaft.

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