CN112428612A - Hollow graphite electrode extrusion die - Google Patents
Hollow graphite electrode extrusion die Download PDFInfo
- Publication number
- CN112428612A CN112428612A CN202011245386.4A CN202011245386A CN112428612A CN 112428612 A CN112428612 A CN 112428612A CN 202011245386 A CN202011245386 A CN 202011245386A CN 112428612 A CN112428612 A CN 112428612A
- Authority
- CN
- China
- Prior art keywords
- graphite electrode
- die
- discharge nozzle
- gland
- cylinder body
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 57
- 239000010439 graphite Substances 0.000 title claims abstract description 57
- 238000001125 extrusion Methods 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000007704 transition Effects 0.000 claims abstract description 4
- 210000004907 gland Anatomy 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 9
- 239000011324 bead Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000003491 array Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 11
- 239000002003 electrode paste Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000011300 coal pitch Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 239000011334 petroleum pitch coke Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/22—Extrusion presses; Dies therefor
- B30B11/221—Extrusion presses; Dies therefor extrusion dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/34—Heating or cooling presses or parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Discharge Heating (AREA)
Abstract
The invention discloses a hollow graphite electrode extrusion die which comprises an extrusion cylinder body, a die body and a discharge nozzle, wherein the extrusion cylinder body, the die body and the discharge nozzle are coaxially connected; the extrusion cylinder body is connected with the die body through a fastening screw; a fixed seat is fixed on the axle center of a port of the die body connected with the extrusion cylinder body through a plurality of splitter plates, and a core bar is coaxially arranged on the fixed seat; the discharge nozzle is in threaded connection with the lower end of the die body, the discharge nozzle is provided with a material opening which is in arc transition and gradually reduced, and the core rod extends to the material opening and does not extend out of the material opening. The invention has good use effect, and can replace core rods and discharge nozzles with different specifications according to the requirements, thereby preparing hollow graphite electrodes with different specifications, improving the applicability of the die and avoiding the use limitation of a single die; in addition, when the graphite electrode is extruded from the discharge nozzle, cold air enters the cavity through the air inlet pipe and then blows to the graphite electrode through the guide grooves, so that the preliminary cooling of the graphite electrode is realized, and the shaping of the graphite electrode is facilitated.
Description
Technical Field
The invention relates to the technical field of graphite electrodes, in particular to a hollow graphite electrode extrusion die.
Background
The graphite electrode is a high-temperature resistant graphite conductive material prepared by using petroleum coke and pitch coke as aggregates and coal pitch as an adhesive through the steps of raw material calcination, crushing and grinding, batching, kneading, molding, roasting, dipping, graphitization and machining, and is called an artificial graphite electrode (graphite electrode for short) and is different from a natural graphite electrode prepared by using natural graphite as a raw material. The hollow graphite electrode has better thermal shock resistance, thereby improving the use current of the electrode and strengthening the smelting process. In addition, the hollow graphite electrode can also blow in compressed air, carbon dioxide and argon in the steelmaking process, so that the smelting effect is improved, the convection direction is changed, the heat exchange efficiency of electric arc furnace charge is improved, the electrode loss is reduced, and the hollow graphite electrode is also beneficial to the roasting and graphitization processes of the electrode.
The existing extrusion die for the hollow graphite electrode generally corresponds to one extrusion die in one specification, the applicability and interchangeability of the die are poor, the graphite electrodes in multiple specifications are inconvenient to produce, in addition, the graphite electrodes need to be transferred to cooling equipment for cooling and shaping after being extruded, and the extrusion die does not have a cooling function generally.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the existing defects, and provide the hollow graphite electrode extrusion die which has good use effect and can replace core rods and discharge nozzles with different specifications according to the requirements, so that hollow graphite electrodes with different specifications are prepared, and the applicability of the die is improved; the graphite electrode is initially cooled, the graphite electrode is shaped, and the problems in the background art can be effectively solved.
In order to achieve the purpose, the invention provides the following technical scheme: a hollow graphite electrode extrusion die comprises an extrusion cylinder body, a die body and a discharge nozzle, wherein the extrusion cylinder body, the die body and the discharge nozzle are coaxially connected; the extrusion cylinder body is connected with the die body through a fastening screw; a fixed seat is fixed on the axis of a port of the die body connected with the extrusion cylinder body through a plurality of splitter plates, and a core rod is coaxially arranged on the fixed seat; the discharge nozzle is in threaded connection with the lower end of the die body and provided with a gradually-reduced material port in arc transition, and the core rod extends to the material port and does not extend out of the material port; the lower extreme of ejection of compact mouth is fixed with the gland, and the gland is equipped with the notch relative with the material mouth, and the lower extreme of ejection of compact mouth is equipped with annular circular bead, and the periphery of gland, the periphery of ejection of compact mouth and the terminal surface cooperation of gland form the cavity, and the periphery of gland is equipped with the intake pipe with the cavity intercommunication, and the guiding gutter of intercommunication cavity and annular circular bead inner chamber is seted up to annular circular bead.
Preferably, a plurality of the splitter plates are arranged in an annular array and fixedly connected with the inner wall of the die body.
Preferably, the lower extreme of extrusion cylinder body is equipped with the outer edge, and the upper end of die body is equipped with the ring flange, and ring flange circular array has the screw thread through-hole, and the outer edge is equipped with the screw thread blind hole that corresponds with the screw thread through-hole, and fastening screw and screw thread through-hole and screw thread blind hole adaptation.
Preferably, the lower terminal surface of fixing base is equipped with the recess, and the axis of fixing base is equipped with the screw hole that runs through the recess, and the core bar is located the recess and the up end is equipped with the screw thread blind hole, and the core bar passes through the bolt fastening in the recess.
Preferably, the upper end face of the gland is provided with a sealing ring, and the step face of the discharge nozzle is provided with a sealing groove matched with the sealing ring.
Preferably, the end face of the gland is fixedly connected with the annular shoulder through a plurality of screws, and the number of the screws is multiple.
Preferably, the ratio of the inner diameter of the material opening to the inner diameter of the annular shoulder is 1: 1.2-1.5.
Preferably, the annular array of the diversion trenches is provided with a plurality of diversion trenches, and the air flow enters along the tangential direction of the side wall of the inner cavity of the annular shoulder under the guiding action of the diversion trenches.
Compared with the prior art, the invention has the beneficial effects that: according to the hollow graphite electrode extrusion die, after electrode paste enters the extrusion cylinder body, under the action of the extruder, the electrode paste enters the die body and is extruded from a gap between the die body and the core rod, so that a hollow graphite electrode is prepared; the core bar is connected with the fixed seat through a bolt, the core bar with different specifications can be replaced according to the requirement, the discharging nozzle is in threaded connection with the die body, and the discharging nozzle with different specifications can be replaced according to the requirement, so that hollow graphite electrodes with different specifications can be manufactured, the applicability of the die is improved, and the use limitation of a single die is avoided; in addition, when the graphite electrode is extruded from the discharge nozzle, cold air enters the cavity through the air inlet pipe and then blows to the graphite electrode through the guide grooves, so that the preliminary cooling of the graphite electrode is realized, and the shaping of the graphite electrode is facilitated.
Drawings
FIG. 1 is a first schematic structural diagram of the present invention;
FIG. 2 is a second schematic structural view of the present invention;
FIG. 3 is a partial schematic view of the present invention;
FIG. 4 is a cross-sectional view of the present invention;
fig. 5 is a schematic view of the discharge nozzle and gland structure of the present invention.
In the figure: the extrusion cylinder body, the 1.1 outer edge, the 2 die body, the 2.1 ring flange, the 2.2 flow distribution plate, the 2.3 fixing base, the 3 ejection of compact mouth, the 3.1 annular circular bead, the 3.2 guiding gutter, the 3.3 seal groove, the 3.4 material mouths, the 4 gland, the 4.1 intake pipe, the 4.2 sealing ring, the 4.3 screw, 5 fastening screw, 6 core bars, 7 bolts, 8 cavities.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: a hollow graphite electrode extrusion die comprises an extrusion cylinder body 1, a die body 2 and a discharge nozzle 3, wherein the extrusion cylinder body 1, the die body 2 and the discharge nozzle 3 are coaxially connected; the extrusion cylinder body 1 is connected with the die body 2 through a fastening screw 5; a fixed seat 2.3 is fixed on the axle center of a port of the die body 2 connected with the extrusion cylinder body 1 through a plurality of splitter plates 2.2, and a core rod 6 is coaxially arranged on the fixed seat 2.3; the discharge nozzle 3 is in threaded connection with the lower end of the die body 2, the discharge nozzle 3 is provided with a material port 3.4 which is in arc transition and is in a gradually reduced shape, the core rod 6 extends to the material port 3.4 and does not extend out of the material port 3.4, and after the electrode paste enters the extrusion cylinder body 1, the electrode paste enters the die body 2 under the action of an extruder and is extruded from a gap between the die body 2 and the core rod 6, so that a hollow graphite electrode is prepared; a gland 4 is fixed at the lower end of the discharge nozzle 3, the gland 4 is provided with a notch opposite to the material port 3.4, the lower end of the discharge nozzle 3 is provided with an annular shoulder 3.1, the periphery of the gland 4, the periphery of the discharge nozzle 3 and the end surface of the gland 4 are matched to form a cavity 8, the periphery of the gland 4 is provided with an air inlet pipe 4.1 communicated with the cavity 8, the annular shoulder 3.1 is provided with a diversion trench 3.2 communicated with the cavity 8 and the inner cavity of the annular shoulder 3.1, when a graphite electrode is extruded from the discharge nozzle 3, cold air enters the cavity 8 through the air inlet pipe 4.1 and then blows to the graphite electrode through the diversion trenches 3.2, so that the preliminary cooling of the graphite electrode is realized, the graphite electrode is favorably shaped, and cooling water can also be introduced to cool the;
in order to homogenize the graphite electrode paste and enable the material to uniformly enter the die body 2, a plurality of flow distribution plates 2.2 are annularly arrayed and fixedly connected with the inner wall of the die body 2;
in order to conveniently detach the extrusion cylinder body 1 and the die body 2, the lower end of the extrusion cylinder body 1 is provided with an outer edge 1.1, the upper end of the die body 2 is provided with a flange 2.1, threaded through holes are annularly arrayed on the flange 2.1, threaded blind holes corresponding to the threaded through holes are formed in the outer edge 1.1, and fastening screws 5 are matched with the threaded through holes and the threaded blind holes;
in order to conveniently replace core rods 6 with different specifications, a groove is formed in the lower end face of the fixed seat 2.3, a threaded hole penetrating through the groove is formed in the axis of the fixed seat 2.3, the core rod 6 is located in the groove, a threaded blind hole is formed in the upper end face of the core rod 6, and the core rod 6 is fixed in the groove through a bolt 7;
in order to ensure that a cavity 8 formed when the gland 4 and the discharge nozzle 3 are fixed is tightly sealed and reduce air leakage, the upper end surface of the gland 4 is provided with a sealing ring 4.2, and the step surface of the discharge nozzle 3 is provided with a sealing groove 3.3 matched with the sealing ring 4.2;
in order to conveniently detach the gland 4 and the discharge nozzle 3, the end face of the gland 4 is fixedly connected with the annular shoulder 3.1 through a plurality of screws 4.3, and a plurality of screws 4.3 are arranged in an annular array;
according to production needs, the extrusion cylinder body 1, the die body 2, the discharge nozzle 3 and the gland 4 can be disassembled, the core rod 6 and the discharge nozzle 3 are replaced, hollow graphite electrodes with different specifications are manufactured, the applicability of the die is improved, and the use limitation of a single die is avoided;
in order to avoid the graphite electrode from blocking the flow guide groove 3.2 to cause airflow blockage when the graphite electrode is discharged from the material opening 3.4, the ratio of the inner diameter size of the material opening 3.4 to the inner diameter size of the annular shoulder 3.1 is 1: 1.2-1.5, and the airflow can be ensured to blow to the graphite electrode;
in order to fully cool the peripheral surface of the graphite electrode, a plurality of flow guide grooves 3.2 are arranged in an annular array, and air flow is guided by the flow guide grooves 3.2 to enter along the tangential direction of the side wall of the inner cavity of the annular shoulder 3.1.
The working principle is as follows: when the graphite electrode cooling device is used, after an electrode paste enters the extrusion cylinder body 1, the electrode paste enters the die body 2 under the action of the extruder and is extruded from a gap between the die body 2 and the core rod 6, and when the graphite electrode is extruded from the discharge nozzle 3, cold air enters the cavity 8 through the air inlet pipe 4.1 and then blows towards the graphite electrode through the plurality of flow guide grooves 3.2, so that the preliminary cooling of the graphite electrode is realized, and the graphite electrode is favorably shaped; according to the requirements, the core rod 6 and the discharge nozzle 3 with different specifications can be replaced according to the requirements, so that the hollow graphite electrodes with different specifications can be prepared.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a hollow graphite electrode extrusion die, includes extrusion cylinder body (1), die body (2) and ejection of compact mouth (3), its characterized in that: the extrusion cylinder body (1), the die body (2) and the discharge nozzle (3) are coaxially connected; the extrusion cylinder body (1) is connected with the die body (2) through a fastening screw (5); a fixed seat (2.3) is fixed on the axis of a port connected with the die body (2) and the extrusion cylinder body (1) through a plurality of splitter plates (2.2), and a core rod (6) is coaxially arranged on the fixed seat (2.3); the discharge nozzle (3) is in threaded connection with the lower end of the die body (2), the discharge nozzle (3) is provided with a gradually-reduced material opening (3.4) in arc transition, and the core rod (6) extends to the material opening (3.4) and does not extend out of the material opening (3.4); the lower extreme of ejection of compact mouth (3) is fixed with gland (4), gland (4) are equipped with the notch relative with material mouth (3.4), the lower extreme of ejection of compact mouth (3) is equipped with annular circular bead (3.1), the periphery of gland (4), the periphery of ejection of compact mouth (3) and the terminal surface cooperation of gland (4) form cavity (8), the periphery of gland (4) is equipped with intake pipe (4.1) with cavity (8) intercommunication, guiding gutter (3.2) of intercommunication cavity (8) and annular circular bead (3.1) inner chamber are seted up in annular circular bead (3.1).
2. The hollow graphite electrode extrusion die of claim 1, wherein: the plurality of flow distribution plates (2.2) are arranged in an annular array and are fixedly connected with the inner wall of the die body (2).
3. The hollow graphite electrode extrusion die of claim 1, wherein: the lower extreme of extrusion cylinder body (1) is equipped with outer edge (1.1), and the upper end of die body (2) is equipped with ring flange (2.1), and ring flange (2.1) circular array has the screw thread through-hole, and outer edge (1.1) is equipped with the screw thread blind hole that corresponds with the screw thread through-hole, fastening screw (5) and screw thread through-hole and screw thread blind hole adaptation.
4. The hollow graphite electrode extrusion die of claim 1, wherein: the lower terminal surface of fixing base (2.3) is equipped with the recess, and the axis of fixing base (2.3) is equipped with the screw hole that runs through the recess, and core bar (6) are located the recess and the up end is equipped with the screw thread blind hole, and core bar (6) are fixed in the recess through bolt (7).
5. The hollow graphite electrode extrusion die of claim 1, wherein: the upper end face of gland (4) is equipped with sealing ring (4.2), and the step face of ejection of compact mouth (3) is equipped with seal groove (3.3) with sealing ring (4.2) adaptation.
6. The hollow graphite electrode extrusion die of claim 1, wherein: the end face of the gland (4) is fixedly connected with the annular shoulder (3.1) through a plurality of screws (4.3), and a plurality of screws (4.3) are arranged in an annular array.
7. The hollow graphite electrode extrusion die of claim 1, wherein: the ratio of the inner diameter of the material opening (3.4) to the inner diameter of the annular shoulder (3.1) is 1: 1.2-1.5.
8. The hollow graphite electrode extrusion die of claim 1, wherein: the annular arrays of the diversion trenches (3.2) are provided with a plurality of diversion trenches, and air flow enters along the tangential direction of the side wall of the inner cavity of the annular shoulder (3.1) under the guiding action of the diversion trenches (3.2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011245386.4A CN112428612A (en) | 2020-11-10 | 2020-11-10 | Hollow graphite electrode extrusion die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011245386.4A CN112428612A (en) | 2020-11-10 | 2020-11-10 | Hollow graphite electrode extrusion die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112428612A true CN112428612A (en) | 2021-03-02 |
Family
ID=74700736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011245386.4A Pending CN112428612A (en) | 2020-11-10 | 2020-11-10 | Hollow graphite electrode extrusion die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112428612A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113519577A (en) * | 2021-07-12 | 2021-10-22 | 严明冬 | Method for making hollow noodles |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA70098A (en) * | 1998-04-27 | 2002-11-15 | Greiner Extrusionstechnik Gmbh | CALIBRATION DEVICE WITH AT LEAST ONE CALIBRATION TOOL |
| CN104175524A (en) * | 2013-05-22 | 2014-12-03 | 上海尧华科技发展有限公司 | High-efficiency head for vacuum sizing pipe |
| CN107838218A (en) * | 2017-12-27 | 2018-03-27 | 株洲精工硬质合金有限公司 | A kind of bar extrusion molding dies with holes |
| CN108859064A (en) * | 2018-08-06 | 2018-11-23 | 上海翊科精密挤出技术有限公司 | A kind of hypocrystalline PEEK pipe extrusion device and method |
| CN109123772A (en) * | 2017-06-28 | 2019-01-04 | 湖南中烟工业有限责任公司 | A kind of cigarette filter rod with flavoring function, preparation method and applications |
| CN210453678U (en) * | 2019-08-20 | 2020-05-05 | 铜陵市同威科技有限公司 | Self-supporting plastic pipe extrusion die |
-
2020
- 2020-11-10 CN CN202011245386.4A patent/CN112428612A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA70098A (en) * | 1998-04-27 | 2002-11-15 | Greiner Extrusionstechnik Gmbh | CALIBRATION DEVICE WITH AT LEAST ONE CALIBRATION TOOL |
| CN104175524A (en) * | 2013-05-22 | 2014-12-03 | 上海尧华科技发展有限公司 | High-efficiency head for vacuum sizing pipe |
| CN109123772A (en) * | 2017-06-28 | 2019-01-04 | 湖南中烟工业有限责任公司 | A kind of cigarette filter rod with flavoring function, preparation method and applications |
| CN107838218A (en) * | 2017-12-27 | 2018-03-27 | 株洲精工硬质合金有限公司 | A kind of bar extrusion molding dies with holes |
| CN108859064A (en) * | 2018-08-06 | 2018-11-23 | 上海翊科精密挤出技术有限公司 | A kind of hypocrystalline PEEK pipe extrusion device and method |
| CN210453678U (en) * | 2019-08-20 | 2020-05-05 | 铜陵市同威科技有限公司 | Self-supporting plastic pipe extrusion die |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113519577A (en) * | 2021-07-12 | 2021-10-22 | 严明冬 | Method for making hollow noodles |
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Application publication date: 20210302 |
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