CN112060579A - Circulation filtering device for manufacturing three-dimensional object and filtering method thereof - Google Patents
Circulation filtering device for manufacturing three-dimensional object and filtering method thereof Download PDFInfo
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- CN112060579A CN112060579A CN202011045220.8A CN202011045220A CN112060579A CN 112060579 A CN112060579 A CN 112060579A CN 202011045220 A CN202011045220 A CN 202011045220A CN 112060579 A CN112060579 A CN 112060579A
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- circulating
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- filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/72—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with backwash arms, shoes or nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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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
-
- 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
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
A circulating filter device for manufacturing three-dimensional objects and a filtering method thereof are disclosed, wherein the circulating filter device for manufacturing the three-dimensional objects comprises a back-blowing system, a control system and two or more circulating filter systems, wherein the back-blowing system is used for carrying out back-blowing treatment on a filter element when detecting that a filter element differential pressure value or a frequency value of a frequency converter of the circulating filter system exceeds a first preset value or the working time of the circulating filter system reaches a preset value; and the control system is used for closing the circulating and filtering system and starting any non-working circulating and filtering system to work when the working time of a certain circulating and filtering system reaches a second preset value or the accumulated times of the circulating and filtering system subjected to back flushing treatment exceeds a third preset value. The circulating filter device and the filtering method for manufacturing the three-dimensional object improve the service life of the filter element of the circulating filter system and improve the printing quality of the product.
Description
Technical Field
The invention relates to the technical field of three-dimensional object manufacturing, in particular to a circulating filter device for manufacturing a three-dimensional object and a filtering method thereof.
Background
The selective laser melting technology as one of the additive manufacturing technologies comprises the following basic processes: the powder supply cylinder is raised by one layer thickness to send a certain amount of powder to a working area, the forming cylinder is lowered by one layer thickness, the powder spreading mechanism 3 is used for spreading a layer of powder material on the upper surface of a substrate of the forming cylinder or a formed part, and the vibrating mirror system controls the laser to scan the powder layer of the solid part according to the section outline of the layer, so that the powder is melted and is bonded with the formed part below. The above steps are repeated until several layers of scans are superimposed to complete the entire prototype fabrication.
During the operation of the selective laser melting equipment, smoke dust is generally generated, and if the smoke dust is not processed in time, the smoke dust can pollute a forming area and even cover a protective mirror surface of a laser system, so that laser cannot effectively pass through a lens, and the lens is burnt. At present, a single-cycle filtering system is generally adopted for processing smoke dust, however, when a filter element differential pressure value or a frequency value of a frequency converter exceeds a set value, a large amount of smoke dust is attached to the filter element, the service life of the filter element is influenced by continuous use, and the printing quality is influenced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a circulating filter device for manufacturing a three-dimensional object and a filtering method thereof, wherein the circulating filter device is used for prolonging the service life of a filter element of a circulating filter system and improving the printing quality of a product.
A circulating filter device for manufacturing three-dimensional objects comprises a back-blowing system, a control system and two or more circulating filter systems, wherein the back-blowing system is used for carrying out back-blowing treatment on a filter element when detecting that a filter element differential pressure value or a frequency value of a frequency converter of the circulating filter system exceeds a first preset value or the working time of the circulating filter system reaches a preset value; and the control system is used for closing the circulating and filtering system and starting any non-working circulating and filtering system to work when the working time of a certain circulating and filtering system reaches a second preset value or the accumulated times of the circulating and filtering system subjected to back flushing treatment exceeds a third preset value.
As a further preferred aspect of the present invention, the circulation filtration system comprises at least one circulation filter.
As a further preferable aspect of the present invention, the circulation filtration system includes two or more circulation filters, and the two or more circulation filters are operated simultaneously.
As a further preferable aspect of the present invention, the blowback system includes two or more blowbacks, and one blowback is provided for each circulation filter.
The invention also provides a filtering method of the circulating filter device for manufacturing the three-dimensional object, which comprises the following steps:
step one, starting any one of all circulating filtration systems to carry out filtration work;
secondly, when detecting that the filter element differential pressure value or the frequency value of the frequency converter of the circulating filtration system exceeds a first preset value or the working time of the circulating filtration system reaches a preset value, starting a back flushing system to perform back flushing treatment on the filter element;
and step three, when the working time of the circulating filtration system reaches a second preset value or the accumulated times of the circulating filtration system subjected to back flushing treatment exceeds a third preset value, closing the circulating filtration system, and starting any circulating filtration system which does not work to work.
As a further preferable aspect of the present invention, the method further comprises:
timing when each circulating filter system starts to work; and
when each circulating filter system is subjected to back flushing once, counting is carried out once.
As a further preferable scheme of the present invention, when the circulating filtration system includes two or more circulating filters, when a filter element pressure difference value or a frequency value of a frequency converter of any one of the circulating filters exceeds a first preset value, or when a working time of the circulating filter reaches a preset value, the back-flushing system is started to perform back-flushing processing on the filter element of the circulating filter.
As a further preferable scheme of the present invention, when the circulation filtration system includes two or more circulation filters, when the working time of any one circulation filter reaches the second preset value or the accumulated number of times of blowback processing of the circulation filter exceeds the third preset value, the circulation filtration system is shut down, and any circulation filtration system which is not working is started to work.
As a further preferred scheme of the invention, when the back-blowing system performs back-blowing treatment on the filter element of the circulating filtration system, the equipment construction is suspended, and the circulating filtration system stops working.
The invention relates to a circulating filter device for manufacturing three-dimensional objects and a filtering method thereof, wherein the circulating filter device comprises two or more circulating filter systems, and when the filter element differential pressure value or the frequency value of a frequency converter of the circulating filter system is detected to exceed a first preset value or the working time of the circulating filter system reaches a preset value, the filter element is subjected to back flushing treatment; when the working time of a certain circulating filter system reaches a second preset value or the accumulated times of the circulating filter system subjected to back flushing treatment exceeds a third preset value, the circulating filter system is closed, and any one of the circulating filter systems which do not work is started to work, so that the circulating filter system and the printing method thereof can be used for reasonably optimizing two or more circulating filter systems, the service life of a filter element of the circulating filter device is prolonged, and the printing quality is improved.
Drawings
FIG. 1 is a schematic view of the construction of a circulating filter according to the present invention;
FIG. 2 is a method flow diagram of one embodiment of a filtering method of the present invention for a circulating filtering apparatus for manufacturing three-dimensional objects.
In the drawings, the reference numbers:
1. cabinet body, 2, filter core, 3, converter, 4, differential pressure sensor.
Detailed Description
In order that the invention may be more fully understood, a more particular description of the invention will now be rendered by reference to specific embodiments thereof that are illustrated in the appended 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.
The invention provides a circulating filter device for manufacturing a three-dimensional object, which aims to solve the technical problems that in the prior art, only a single circulating filter system is adopted for working, however, when a filter element pressure difference value or a frequency value of a frequency converter exceeds a set value, a large amount of smoke dust is attached to a filter element, and the service life of the filter element is influenced when the filter element is continuously used. In order to prolong the service life of the filter element, the filter element needs to be cleaned at the moment, namely, a back flushing function is started, and the filter element is subjected to back flushing treatment; and the control system is used for closing the circulating and filtering system and starting any non-working circulating and filtering system to work when the working time of a certain circulating and filtering system reaches a second preset value or the accumulated times of the circulating and filtering system subjected to back flushing treatment exceeds a third preset value. Therefore, the circulating filter system can perform polling work, or after the working circulating filter system frequently performs back flushing treatment, the working circulating filter system is switched to another circulating filter system to work, so that the filter element of the working circulating filter system is prevented from being damaged, the service life of the filter element is prolonged, and the working stability of the circulating filter device is further ensured.
As shown in fig. 1, the circulation filtering system includes a cabinet 1, a filter element 2, a frequency converter 3 and a differential pressure sensor 4, and it should be noted that the circulation filtering system is an existing component, and it may further include other components, which are not specifically described herein.
In a specific implementation, the circulation filtration system comprises at least one circulation filter, for example two or more circulation filters, and the two or more circulation filters work simultaneously. Therefore, the area of the filter element can be increased, and the service life of the filter element is further prolonged. Of course, in specific implementation, the circulation filtering system can also comprise three or four … … circulation filters, and the circulation filters work simultaneously according to needs.
The back-blowing system comprises two or more back-blowing devices, each circulation filter corresponds to one back-blowing device, specifically, each circulation filter comprises one back-blowing device, the back-blowing device is used for performing back-blowing treatment on a filter element of the circulation filter, and of course, the circulation filter and the back-blowing device can also be two independent components, and thus, the above-mentioned operations can be respectively realized. Specifically, the back-flushing system can set different back-flushing thresholds according to different materials.
The present invention also provides a filtering method of the circulation filtering apparatus for manufacturing three-dimensional objects as described in any one of the above, as shown in fig. 2, the method comprising the steps of:
and step 23, when the working time of the circulating filtration system reaches a second preset value or the accumulated times of the circulating filtration system subjected to back flushing treatment exceeds a third preset value, closing the circulating filtration system, and starting any circulating filtration system which does not work to work.
The preset value, the first preset value, the second preset value and the third preset value are set according to specific requirements, for example, the preset value may be 100h, the first preset value may be 2000pa of pressure difference or 70% of the frequency of the highest frequency of the frequency converter, the second preset value may be 200h, and the third preset value may be 50 times.
Specifically, the method further comprises:
timing when each circulating filter system starts to work; and
when each circulating filter system is subjected to back flushing once, counting is carried out once.
It should be noted that, when the circulation filter system includes two or more circulation filters, each circulation filter is separately clocked and each circulation filter is subjected to the blowback process once, and the respective counts are separately counted.
In order to further ensure the service life of the filter element of the circulating filter system, when the circulating filter system comprises two or more circulating filters, and when the filter element differential pressure value or the frequency value of a frequency converter of any circulating filter exceeds a first preset value, or the working time of the circulating filter reaches a preset value, a back flushing system is started to carry out back flushing treatment on the filter element of the circulating filter; and when the circulating filtration system comprises two or more circulating filters, when the working time of any circulating filter reaches a second preset value or the accumulated times of the reverse blowing treatment of the circulating filter exceeds a third preset value, closing the circulating filtration system, and starting any non-working circulating filtration system to work.
In specific implementation, when the back flushing system performs back flushing treatment on a filter element of the circulating filtration system, the equipment construction is suspended, and the circulating filtration system stops working.
In order to make the technical solution of the present invention better understood and realized by those skilled in the art, the following description specifically describes two circulation filtration systems as an example.
Example one
1) And when the accumulated running time of the first circulation filtering system reaches 200h, switching to a second circulation filtering system. When the accumulated running time of the second circulation filtering system reaches 200h, the first circulation filtering system is switched to. And switching the circulating filter system by adopting a polling mode.
2) When the first circulating filtration system is switched to the second circulating filtration system, equipment construction needs to be suspended, a fan of the circulating filtration system is closed, oxygen content values of an inlet and an outlet of the circulating filtration system are judged at the same time, and when the oxygen content values reach set values, a connecting valve with a host is closed.
3) And after the second circulating filtration system is connected, continuing the equipment construction, starting the fan, paving the powder for a layer thickness, and then sintering.
4) And after the accumulated running time of the second circulation filtering system reaches 200h, switching to the first circulation filtering system, wherein the switching method is as described above.
Example two
1) The first circulating filtration system detects that the filter element differential pressure value is 2000pa or the frequency is 70% of the highest frequency of the frequency converter in the operation process, and the filter element is indicated to be attached with a large amount of smoke dust at the moment and to be continuously used, so that the filter element differential pressure is too high, the frequency converter is overloaded, and the equipment is shut down. In order to prolong the service life of the filter element, the filter element needs to be cleaned, namely, a back flushing function is started to clean the filter element; or the first circulating filtration system starts a back-blowing function every 100h in the running process to clean the filter element.
3) When the circulating filtration system is subjected to back flushing, equipment construction needs to be suspended, a fan of the circulating filtration system is closed, oxygen content values of an inlet and an outlet of the circulating filtration system are judged at the same time, and when the oxygen content values reach set values, a connecting valve with a host is closed. At this time, the back-blowing condition is satisfied, and the back-blowing operation can be performed. After the back flushing is finished, the circulating filter system needs to be placed for a certain time in a standing mode, after the dust in the filter cylinder is stable, the equipment can be started to be built, and the equipment is continuously sintered after the dust is spread for a layer thickness.
4) When the filter element of the circulating filtration system is subjected to back flushing for multiple times (for example, the back flushing times reach 50 times), the pressure difference value of the filter element of the circulating filtration system is 2000pa frequently or the frequency is 70% of the highest frequency of the frequency converter, and at the moment, the first circulating filtration system is switched to the second circulating filtration system.
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 (9)
1. A circulating filter device for manufacturing three-dimensional objects is characterized by comprising a back-blowing system, a control system and two or more circulating filter systems, wherein the back-blowing system is used for carrying out back-blowing treatment on a filter element when detecting that a filter element differential pressure value or a frequency value of a frequency converter of the circulating filter system exceeds a first preset value or the working time of the circulating filter system reaches a preset value; and the control system is used for closing the circulating and filtering system and starting any non-working circulating and filtering system to work when the working time of a certain circulating and filtering system reaches a second preset value or the accumulated times of the circulating and filtering system subjected to back flushing treatment exceeds a third preset value.
2. The circulating filter apparatus for producing three-dimensional objects according to claim 1, wherein the circulating filter system comprises at least one circulating filter.
3. The circulation filtering device for manufacturing three-dimensional objects according to claim 2, wherein the circulation filtering system comprises two or more circulation filters, and the two or more circulation filters are operated simultaneously.
4. The endless filter device for the manufacture of three-dimensional objects according to claim 3, wherein said blow back system comprises two or more blow back blowers, one for each endless filter.
5. A filtering method of a circulating filter device for manufacturing three-dimensional objects according to any one of claims 1 to 4, comprising the steps of:
step one, starting any one of all circulating filtration systems to carry out filtration work;
secondly, when detecting that the filter element differential pressure value or the frequency value of the frequency converter of the circulating filtration system exceeds a first preset value or the working time of the circulating filtration system reaches a preset value, starting a back flushing system to perform back flushing treatment on the filter element;
and step three, when the working time of the circulating filtration system reaches a second preset value or the accumulated times of the circulating filtration system subjected to back flushing treatment exceeds a third preset value, closing the circulating filtration system, and starting any circulating filtration system which does not work to work.
6. The method of filtering of a circulating filter arrangement for manufacturing three-dimensional objects according to claim 5, wherein the method further comprises:
timing when each circulating filter system starts to work; and
when each circulating filter system is subjected to back flushing once, counting is carried out once.
7. The filtering method of the circulating filter device for manufacturing three-dimensional objects according to claim 6, wherein when the circulating filter system comprises two or more circulating filters, when the filter element differential pressure value or the frequency value of the frequency converter of any one circulating filter exceeds a first preset value, or the working time of the circulating filter reaches a preset value, the back-blowing system is activated to perform back-blowing treatment on the filter element of the circulating filter.
8. The filtering method of the circulation filtering apparatus for manufacturing three-dimensional objects according to claim 7, wherein when the circulation filtering system includes two or more circulation filters, when the operation time of any one of the circulation filters reaches the second preset value or the cumulative number of times of the blowback processing of the circulation filter exceeds the third preset value, the circulation filtering system is shut down and any one of the circulation filtering systems which is not operated is started to operate.
9. The filtering method of the circulating filter device for manufacturing three-dimensional objects according to any one of claims 5 to 8, wherein when the back-blowing system performs the back-blowing treatment on the filter element of the circulating filter system, the construction of the equipment is suspended and the operation of the circulating filter system is stopped.
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| CN202011045220.8A CN112060579B (en) | 2020-09-29 | 2020-09-29 | Circulating filter device for manufacturing three-dimensional object and filtering method thereof |
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| CN202011045220.8A CN112060579B (en) | 2020-09-29 | 2020-09-29 | Circulating filter device for manufacturing three-dimensional object and filtering method thereof |
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| CN112060579A true CN112060579A (en) | 2020-12-11 |
| CN112060579B CN112060579B (en) | 2022-08-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115501718A (en) * | 2022-10-13 | 2022-12-23 | 南京中科煜宸激光技术有限公司 | Circulating filtering system and filtering method for selective laser melting equipment |
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| CN206965383U (en) * | 2017-07-14 | 2018-02-06 | 西安铂力特增材技术股份有限公司 | A kind of circulating purifying device in 3D printing equipment |
| CN108970266A (en) * | 2018-09-21 | 2018-12-11 | 天津镭明激光科技有限公司 | A kind of dust-extraction unit and dust removal method of increasing material manufacturing laser formation equipment |
| CN111054158A (en) * | 2019-12-25 | 2020-04-24 | 郴州旗滨光伏光电玻璃有限公司 | Back-blowing cleaning system and method for filter element of filter house of glass melting furnace |
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2020
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| CN103623656A (en) * | 2013-11-22 | 2014-03-12 | 江苏华强新能源科技有限公司 | Blowback control method for air filter |
| CN206965383U (en) * | 2017-07-14 | 2018-02-06 | 西安铂力特增材技术股份有限公司 | A kind of circulating purifying device in 3D printing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115501718A (en) * | 2022-10-13 | 2022-12-23 | 南京中科煜宸激光技术有限公司 | Circulating filtering system and filtering method for selective laser melting equipment |
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