CN113070489A - 3D printing apparatus's surplus powder recovery processing system - Google Patents
3D printing apparatus's surplus powder recovery processing system Download PDFInfo
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- CN113070489A CN113070489A CN202110470568.XA CN202110470568A CN113070489A CN 113070489 A CN113070489 A CN 113070489A CN 202110470568 A CN202110470568 A CN 202110470568A CN 113070489 A CN113070489 A CN 113070489A
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- powder
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- residual powder
- collecting container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/002—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with external filters
Abstract
A residual powder recovery processing system of 3D printing equipment comprises a vacuum pump, a residual powder collecting container, a new powder collecting container, a waste residue collecting container, a first cyclone separating tank, a second cyclone separating tank and a vibrating screen; the vacuum pump comprises an air suction port and an air exhaust port, the air exhaust port is sequentially and selectively communicated with the residual powder collecting container, the feeding ends of the first cyclone separating tank and the second cyclone separating tank, and the air suction port is communicated with the air exhaust end of the second cyclone separating tank; the discharge end of the first cyclone separation tank can be selectively communicated with the feed end of the vibrating screen, and the discharge end of the vibrating screen is communicated with the new powder collection container; the discharge end of the second cyclone separating tank is communicated with the waste residue collecting container. The residual powder recovery processing system of the 3D printing equipment can basically realize unmanned screening operation, automatically convey and screen a large amount of powder, realize internal circulation by using a certain amount of inert gas, save the inert gas, protect the powder performance and keep away from dust storm risks, and protect the personal safety of operators.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a residual powder recycling system of 3D printing equipment.
Background
Additive Manufacturing (AM) is an advanced Manufacturing technology with the advantages of digital Manufacturing, high flexibility and adaptability, direct CAD model driving, rapidness, rich and diverse material types, and the like. Among them, Selective Laser Melting (SLM) is one of the additive manufacturing technologies that have been rapidly developed in recent years, and the basic process is as follows: the upper powder feeding device feeds a certain amount of metal powder to a working table, a layer of powder material is flatly laid on the upper surface of a formed part in a forming cylinder by a conventional powder laying and scraping mechanism, and a laser is controlled by a vibrating mirror system to scan a powder layer of a solid part according to the section outline of the layer, so that the powder is melted and bonded with the formed part below; after the section of one layer is sintered, the working table is lowered by the thickness of one layer, the powder spreading and scraping mechanism is used for spreading a layer of uniform and compact powder on the working table, scanning sintering is carried out on the section of a new layer, and the new layer is scanned and overlapped by a plurality of layers until the whole prototype manufacturing is completed.
In the above technology, the powder which is not sintered by laser scanning in the forming cylinder and the powder pushed into the front and rear powder overflow cylinders are collectively called residual powder, and the residual powder is conveyed into a professional vibrating screen to screen coarse-grained waste residues and foreign matters, and then the residual powder is collected and can be reused.
Along with market demands, the sizes of a forming cylinder and a printing workpiece are larger and larger, the amount of powder pushed out by printing one forming cylinder is larger and larger, the residual powder is conveyed and treated in a manual mode, the conveying and treatment are labor-consuming and dangerous, part of metal powder is high in activity and is easy to oxidize in natural air, the oxidized powder influences sintering performance, even dust explosion fog masses can be formed in the gas transportation and screening processes, the environment is polluted, and potential safety hazards can be brought to personnel when the powder contacts with operators.
Disclosure of Invention
Based on the method, the invention provides a residual powder recovery processing system of the 3D printing equipment, which adopts closed-loop control, automatic residual powder conveying and powder screening processing.
In order to achieve the purpose, the invention provides a residual powder recovery processing system of 3D printing equipment, which comprises a vacuum pump, a residual powder collecting container, a new powder collecting container, a waste residue collecting container, a first cyclone separating tank, a second cyclone separating tank and a vibrating screen, wherein the vacuum pump is connected with the residual powder collecting container; wherein the content of the first and second substances,
the vacuum pump comprises an air suction port and an air exhaust port, the air exhaust port is sequentially and selectively communicated with the residual powder collecting container, the feeding ends of the first cyclone separating tank and the second cyclone separating tank, and the air suction port is communicated with the exhaust end of the second cyclone separating tank;
the discharge end of the first cyclone separation tank can be selectively communicated with the feed end of the vibrating screen, and the discharge end of the vibrating screen is communicated with the new powder collection container;
and the discharge end of the second cyclone separation tank is communicated with a waste residue collection container.
As a further preferable scheme of the invention, the first cyclone separation tank comprises two cyclone separation tanks connected in parallel, the feeding ends of the two cyclone separation tanks can be selectively communicated with the residual powder collecting container, and the exhaust ends of the two cyclone separation tanks can be selectively communicated with the feeding end of the second cyclone separation tank.
As a further preferable scheme of the invention, the upper part and the lower part of the cyclone separation tank are respectively provided with a first material level switch and a second material level switch, and when the first material level switch is lightened, the cyclone separation tank stops working; and when the second material level switch is turned on and off, the cyclone separation tank is started to work.
As a further preferable scheme of the present invention, the residual powder recycling system further includes a differential pressure sensor for detecting a differential pressure across the vacuum pump.
As a further preferable aspect of the present invention, the cyclone tank is further provided with an air supply port for balancing pressure by charging air to the air supply port when the differential pressure sensor detects that the differential pressure is too large.
As a further preferable aspect of the present invention, the residual powder collecting container is an inverted tank structure and/or a molding cylinder having an open mouth.
In a further preferred embodiment of the present invention, the gas circulating through the exhaust port and the suction port of the vacuum pump is an inert gas.
In a further preferred embodiment of the present invention, a filter is further connected to the exhaust port of the vacuum pump, and the filter is used for conveying the gas exhausted from the vacuum pump to the residual powder collecting container after the filtering treatment.
As a further preferable scheme of the present invention, the vibrating screen comprises a screen cover and a screen mesh, and the screen cover is provided with a material level switch for stopping the powder from continuously falling to the screen mesh when the powder on the screen mesh is excessive.
As a further preferable scheme of the invention, the sieve cover is also provided with an observation window for checking the internal condition of the vibrating sieve; and the screen is connected with an ultrasonic generator to provide high-frequency vibration for the screen.
By adopting the technical scheme, the residual powder recycling system of the 3D printing equipment has the following beneficial effects:
1. the whole system adopts closed-loop control, can basically realize unmanned screening operation, automatically convey and screen a large amount of powder, can realize internal circulation by using a certain amount of inert gas, save the inert gas, protect the powder performance and keep away from dust storm risks, and protect the personal safety of operators;
2. the vacuum pump is adopted for sucking air to realize the recovery treatment of residual powder, the sucking air is milder compared with the traditional blowing air, and the two-stage separation operation is adopted, so that the separation effect is better;
3. the residual powder recovery processing system can work separately from the additive manufacturing equipment, so that the defects of high cost and large occupied space caused by the fact that one additive manufacturing equipment needs to be provided with a corresponding powder processing system are overcome, one system can correspond to a plurality of additive manufacturing equipment, the universality is higher, the work is more stable, and the cost is lower.
Drawings
Fig. 1 is a working schematic diagram of a remaining powder recycling system of a 3D printing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation of the cyclone tank of the present invention;
fig. 3 is a top view of the powder motion trajectory of the vibrating screen of the present invention.
Description of the drawings: 1. the device comprises a vacuum pump, 2, a residual powder tank, 3, a left-handed air separation tank, 4, a right-handed air separation tank, 5, a vibrating screen, 6, a new powder collection container, 7, a second cyclone separation tank, 8, a waste residue collection container, 9, a powder cleaning cavity, 10, a first pneumatic butterfly valve, 11, a second pneumatic butterfly valve, 12, a third pneumatic butterfly valve, 13, a fourth pneumatic butterfly valve, 14, a fifth pneumatic butterfly valve, 15, a sixth pneumatic butterfly valve, 16, a seventh pneumatic butterfly valve, 17, an eighth pneumatic butterfly valve, 18, a ninth pneumatic butterfly valve, 19, a first left material level switch, 20, a first right material level switch, 21, a second left material level switch, 22, a second right material level switch, 23, a tenth pneumatic butterfly valve, 24, an eleventh pneumatic butterfly valve, 25, an exhaust port, 26 and an air suction port.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present, unless otherwise specified. It will also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or one or more intervening elements may also be present.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will also be understood that when interpreting elements, although not explicitly described, the elements are to be interpreted as including a range of errors which are within the acceptable range of deviation of the particular values as determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.
Furthermore, the drawings are not 1: 1, and the relative dimensions of the various elements in the figures are drawn for illustration only and not necessarily to true scale.
Referring to fig. 1, the residual powder recycling system of the 3D printing apparatus according to an embodiment of the present invention includes a vacuum pump 1, a residual powder collecting container, a new powder collecting container 6, a waste residue collecting container 8, a first cyclone separating tank, a second cyclone separating tank 7, and a vibrating screen 5; wherein the content of the first and second substances,
the vacuum pump 1 comprises a suction port 26 and an exhaust port 25, the exhaust port 25 is sequentially and selectively communicated with the residual powder collecting container, the feeding ends of the first cyclone separating tank and the second cyclone separating tank 7, and the suction port 26 is communicated with the exhaust end of the second cyclone separating tank 7;
the discharge end of the first cyclone separation tank can be selectively communicated with the feed end of a vibrating screen 5, and the discharge end of the vibrating screen 5 is communicated with a new powder collection container 6;
and the discharge end of the second cyclone separation tank 7 is communicated with a waste residue collection container 8.
It should be noted that the residual powder collecting container is of an inverted tank structure, or may be a molding cylinder with an open mouth, so as to be more convenient to operate, for example, a container of a tank structure, such as the residual powder tank 2 in fig. 1, may be used to collect powder in the powder overflow tank, the molding cylinder has a larger volume, and may be directly communicated with the closed powder cleaning cavity 9, and the powder processing platform is connected to the residual powder recycling processing system of the present invention, so that it is not necessary to convert the powder of the molding cylinder into the tank structure, even if the operation is convenient, specifically refer to fig. 1, the system is connected to the residual powder tank 2 and the powder cleaning cavity 9 communicated with the molding cylinder at the same time, of course, in the specific implementation, only the residual powder tank 2 may be selected, or only the powder cleaning cavity 9 communicated with the molding cylinder may be selected, of course, a plurality of the residual powder tanks 2 may also be adopted, or a plurality of powder cleaning cavities 9 communicated with the forming cylinder, which are not exemplified herein.
It can be understood that the vacuum pump 1, the residual powder collecting container, the new powder collecting container 6, the waste residue collecting container 8, the first cyclone separating tank, the second cyclone separating tank 7 and the vibrating screen 5 are communicated through pipelines, and a pneumatic butterfly valve is arranged in the pipeline to realize selective communication, and whether the communication is controlled through a control device.
As a preferable scheme of the invention, the first cyclone separation tank comprises two cyclone separation tanks connected in parallel, the feeding ends of the two cyclone separation tanks can be selectively communicated with the residual powder collecting container, and the exhaust ends of the two cyclone separation tanks are communicated with the feeding end of the second cyclone separation tank 7 through a three-way pipe, so that the two cyclone separation tanks can work in turn. Specifically, a first material level switch and a second material level switch are respectively arranged at the upper part and the lower part of the cyclone separation tank, and when the first material level switch is lightened, the cyclone separation tank stops working; and when the second material level switch is turned on and off, the cyclone separation tank is started to work. As shown in fig. 1, when the first cyclone includes a left cyclone 3 and a right cyclone 4, the upper and lower portions of the left cyclone 3 are provided with a first left level switch 19 and a second left level switch 21, respectively, and the upper and lower portions of the right cyclone 4 are provided with a first right level switch 20 and a second right level switch 22, respectively.
In a specific implementation, the system also comprises a control cabinet which contains various control and signal feedback electric components and mainly provides the vacuum pump 1 with powder conveying power and controls the opening or closing of each pneumatic butterfly valve in a system loop. The vacuum pump 1 is operated to make the air at the two ends of the exhaust port 25 and the air suction port 26 flow, and preferably, the residual powder recovery processing system further comprises a pressure difference sensor which is arranged between the exhaust port 25 and the air blowing pipeline of the vacuum pump 1 and is used for monitoring the pressure difference at the two ends in real time. Further preferably, the cyclone separation tank is further provided with an air supplementing port, and when the pressure at the tail end of the air blowing pipeline is too high, the tail end container needs supplementing air for balancing, so that the stable operation of the system is ensured.
Specifically, the gas circulating through the exhaust port and the suction port is a certain amount of inert gas, in a preferred embodiment, the exhaust port 25 of the vacuum pump 1 is further connected with a filter, and is used for conveying the gas exhausted from the vacuum pump 1 to a residual powder collecting container after filtering treatment, i.e. purifying the circulating gas, so that the purified gas (in the present invention, the inert gas is preferably used) is connected with a closed container or cavity (such as the residual powder tank 2 in fig. 1) containing the powder to be conveyed and cleaned through an air blowing pipeline, and then is connected with a target container (such as the first cyclone tank in fig. 1) for conveying, and meanwhile, the beginning end of the air suction pipeline is also connected with the target container or cavity (such as the first cyclone tank in fig. 1), and then the other end is connected back to the suction port 26 of the vacuum pump 1, and a second cyclone tank 7 is connected therebetween, the function of the first cyclone tank and the second cyclone tank 7 is to filter and separate the dust and slag contained in the gas, and the working principle is shown in fig. 2, so that the gas returning to the suction port 26 of the vacuum pump 1 is clean. Preferably, the second cyclone tank 7 is provided with important feedback signals such as a back flushing system, oxygen content detection, a pressure release valve, a pressure difference sensor and the like, so as to realize the functions of filter element service life detection, environment detection in a circulating system, explosion prevention and the like. Dust and slag in the gas collected by the waste slag collecting container 8 at the lower end of the second cyclone separating tank 7 can be intensively and professionally treated.
The main function of the vibrating screen 5 is to perform powder screening, i.e. to filter out smoke, waste residues and other foreign matters in the powder beyond the particle size range of the powder. Since it is a prior art component, the specific structure thereof will not be described in detail in this application, and for example, it may be preferable to power two vibration motors symmetrically installed at an angle of 45 ° so that the filter screen moves up and down in the amplitude range while allowing the powder to make a spiral motion on the screen, the direction of which is shown in fig. 3. The slag discharging port of the vibrating screen 5 is connected with a hose and a waste slag pipe, powder flows downwards to a new powder collecting container 6 through vibration and is collected, and large waste slag is left on the net and is discharged to the slag discharging port outside the screen through movement rotation to enter the waste slag pipe. The vibrating screen 5 is a sealed cavity, but a gap can be generated by considering the vibration of the equipment, so that a gas filling port and a gas discharging port are arranged on a screen cover and below a screen body of the vibrating screen 5 and used for initial gas replacement and later oxygen content maintenance, and a filter is connected at the gas discharging port of the vibrating screen 5 to ensure the safety of discharged gas. Because the screen body can generate clearance by vibration when working, the screen body part is continuously filled with a small amount of inert gas when working so as to ensure that the metal powder is always in the inert gas protection environment when the vibrating screen 5 works. The screen mesh and the screen body of the vibrating screen are both connected with a ground wire to lead out static electricity. The sieve is covered and still is provided with the material level switch for stop the powder when detecting that the powder is too much on the screen cloth and continue to fall to the screen cloth, that is to say if powder screening efficiency piles up to a certain extent on the screen cloth too slowly, can set to only sieve the state that no longer falls the powder on the screen cloth, and no longer pile up until the powder. The vibrating screen 5 can be also provided with an ultrasonic generator which is arranged on the screen mesh to provide high-frequency vibration for the screen mesh, and can play a role in cleaning the screen mesh and improving the screening efficiency. Simultaneously, the sieve covers and has the observation window in addition, conveniently looks over the condition that the powder has already passed through the screen cloth in the sieve, and further preferred, the observation window is the installation of standard ready-package clamp, loosens the back, and the opening part can stretch into dust catcher port pipe and clear up the screen cloth. Preferably, all parts of the equipment are protected by grounding and explosion-proof and dust-proof treatment is adopted.
In order to make those skilled in the art better understand and implement the technical solution of the present invention, the following detailed description of the technical solution of the present invention is made with reference to fig. 1 by an embodiment:
the powder in the residual powder tank 2 is screened and collected (the eleventh pneumatic butterfly valve 24 and the tenth pneumatic butterfly valve 23 are in a closed state), the vacuum pump 1 is started, gas is discharged from the exhaust port 25 and passes through the residual powder tank 2, the ninth starting butterfly valve is opened, and the powder to be treated in the residual powder tank 2 falls into a pipeline. The fifth pneumatic butterfly valve 14 is opened and the first pneumatic butterfly valve 10 opens the gas to drive the powder to flow into the left cyclone 3. The separated gas enters the second cyclone separation tank 7 through the opened second pneumatic butterfly valve 11 and the eighth pneumatic butterfly valve 17, the separated clean gas returns to the suction port 26 of the vacuum pump 1 from the second cyclone separation tank 7, and the separated waste residue is settled to the waste residue collection container 8. Waiting for the first left level switch 19 to light the feedback signal indicating that the maximum powder level has been reached in the left cyclone 3, a cyclone switch is made, i.e. to the right cyclone 4. The first pneumatic butterfly valve 10 and the second pneumatic butterfly valve 11 are closed, and the third pneumatic butterfly valve 12 and the fourth pneumatic butterfly valve 13 are opened (all the pneumatic butterfly valves not mentioned should be in a closed state). When the right cyclone separation tank 4 is switched to start to collect powder, the vibrating screen 5 is started, the sixth pneumatic butterfly valve 15 is opened intermittently, if certain powder is used, the sixth pneumatic butterfly valve 15 is opened for 3 seconds, stops for 20 seconds, then is opened for 3 seconds, stops for 20 seconds again, and the process is repeated. The powder in the left cyclone tank 3 is lowered to a vibrating screen 5 and by screening the available powder is collected in a new powder collection container 6. When the second left material level switch 21 is turned off, the powder in the left cyclone separation tank 3 is completely sieved, and the vibrating screen 5 stops moving at the moment. When the first right level switch 20 is turned on, the third pneumatic butterfly valve 12 and the fourth pneumatic butterfly valve 13 are closed. The vibrating screen 5 is opened while the sixth pneumatic butterfly valve 15 is closed and the seventh pneumatic butterfly valve 16 is opened intermittently. The left cyclone 3 immediately enters a powder collecting state. This is repeated until all the powder in the residual powder tank 2 enters the pipeline, and it is observed that neither the second left level switch 21 nor the second right level switch 22 is lighted. No powder drops in the pipeline of the new powder collecting container 6 connected with the vibrating screen 5, which shows that the powder of the residual powder tank 2 is screened, and the transportation and collection work is finished.
Secondly, the powder in the closed cavity of the powder cleaning cavity 9 is transported, sieved and collected (the fifth pneumatic butterfly valve 14 and the ninth pneumatic butterfly valve 18 are in a closed state)
And starting the vacuum pump 1, enabling gas exhausted from the exhaust port 25 to enter the powder cleaning cavity 9 through the opened eleventh pneumatic butterfly valve 24, butting the closed powder cleaning cavity 9 with the forming cylinder of the additive manufacturing equipment, and enabling the printed forming cylinder to contain powder to be cleaned. The tenth pneumatic butterfly valve 23 is opened, the gas drives the powder to flow and enter the left cyclone separation tank 3, the separated gas enters the second cyclone separation tank 7 through the opened second pneumatic butterfly valve 11 and the eighth pneumatic butterfly valve 17, the separated clean gas returns to the suction port 26 of the vacuum pump 1 from the second cyclone separation tank 7, and the separated waste residue is settled to the waste residue collection container 8. Waiting for the first left level switch 19 to light the feedback signal indicating that the maximum powder level has been reached in the left cyclone 3, a cyclone switch is made, i.e. to the right cyclone 4. The first pneumatic butterfly valve 10 and the second pneumatic butterfly valve 11 are closed, and the third pneumatic butterfly valve 12 and the fourth pneumatic butterfly valve 13 are opened (all the pneumatic butterfly valves not mentioned should be in a closed state). When the right cyclone separation tank 4 is switched to start to collect powder, the vibrating screen 5 is started, the sixth pneumatic butterfly valve 15 is opened intermittently, if certain powder is used, the sixth pneumatic butterfly valve 15 is opened for 3 seconds, stops for 20 seconds, then is opened for 3 seconds, stops for 20 seconds again, and the process is repeated. The powder in the left cyclone tank 3 is lowered to a vibrating screen 5 and by screening the available powder is collected in a new powder collection container 6. When the second left material level switch 21 is turned off, the powder in the left cyclone separation tank 3 is completely sieved, and the vibrating screen 5 stops moving at the moment. When the first right level switch 20 is turned on, the third pneumatic butterfly valve 12 and the fourth pneumatic butterfly valve 13 are closed. The vibrating screen 5 is opened while the sixth pneumatic butterfly valve 15 is closed and the seventh pneumatic butterfly valve 16 is opened intermittently. The left cyclone 3 immediately enters a powder collecting state. The above steps are repeated until all the powder in the powder cleaning cavity 9 enters the pipeline, and the second left level switch 21 and the second right level switch 22 are observed not to be lightened. No powder drops in the pipeline of the new powder collecting container 6 connected with the vibrating screen 5, which shows that the powder of the powder cleaning cavity 9 is screened, and the transportation and collection work is completed.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A residual powder recovery processing system of 3D printing equipment is characterized by comprising a vacuum pump, a residual powder collecting container, a new powder collecting container, a waste residue collecting container, a first cyclone separating tank, a second cyclone separating tank and a vibrating screen; wherein the content of the first and second substances,
the vacuum pump comprises an air suction port and an air exhaust port, the air exhaust port is sequentially and selectively communicated with the residual powder collecting container, the feeding ends of the first cyclone separating tank and the second cyclone separating tank, and the air suction port is communicated with the exhaust end of the second cyclone separating tank;
the discharge end of the first cyclone separation tank can be selectively communicated with the feed end of the vibrating screen, and the discharge end of the vibrating screen is communicated with the new powder collection container;
and the discharge end of the second cyclone separation tank is communicated with a waste residue collection container.
2. The residual powder recycling system of 3D printing equipment according to claim 1, wherein the first cyclone separation tank comprises two cyclone separation tanks connected in parallel, the feeding ends of the two cyclone separation tanks can be selectively communicated with the residual powder collecting container, and the exhaust ends of the two cyclone separation tanks can be selectively communicated with the feeding end of the second cyclone separation tank.
3. The residual powder recycling system of 3D printing equipment according to claim 2, wherein the cyclone tank is provided with a first material level switch and a second material level switch at the upper part and the lower part respectively, and when the first material level switch is turned on, the cyclone tank is stopped; and when the second material level switch is turned on and off, the cyclone separation tank is started to work.
4. The residual powder recycling system of 3D printing equipment according to claim 3, further comprising a pressure difference sensor for detecting the pressure difference across the vacuum pump.
5. The residual powder recycling system of 3D printing equipment according to claim 4, wherein the cyclone tank is further provided with an air supplementing opening for balancing pressure by inflating the air supplementing opening when the differential pressure sensor detects that the differential pressure is too large.
6. The residual powder recycling system of 3D printing equipment according to claim 1, wherein the residual powder collecting container is a tank structure placed upside down and/or a forming cylinder with an open mouth.
7. The residual powder recycling system of 3D printing equipment according to claim 1, wherein the gas circulating in the exhaust port and the suction port of the vacuum pump is inert gas.
8. The residual powder recycling system of 3D printing equipment according to claim 1, wherein the exhaust port of the vacuum pump is further connected with a filter for conveying the gas exhausted from the vacuum pump to the residual powder collecting container after being filtered.
9. The residual powder recycling system of 3D printing equipment according to any one of claims 1 to 8, wherein the vibrating screen comprises a screen cover and a screen mesh, and the screen cover is provided with a material level switch for stopping the powder from continuously falling to the screen mesh when the powder on the screen mesh is too much.
10. The residual powder recycling system of 3D printing equipment according to claim 9, wherein the screen cover is further provided with an observation window for checking the internal condition of the vibrating screen; and the screen is connected with an ultrasonic generator to provide high-frequency vibration for the screen.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114918126A (en) * | 2021-12-10 | 2022-08-19 | 浙江拓博环保科技有限公司 | 3D prints powder and carries screening machine and circulation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114918126A (en) * | 2021-12-10 | 2022-08-19 | 浙江拓博环保科技有限公司 | 3D prints powder and carries screening machine and circulation system |
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