CN110303211B - Electrode clamping tool - Google Patents
Electrode clamping tool Download PDFInfo
- Publication number
- CN110303211B CN110303211B CN201910627952.9A CN201910627952A CN110303211B CN 110303211 B CN110303211 B CN 110303211B CN 201910627952 A CN201910627952 A CN 201910627952A CN 110303211 B CN110303211 B CN 110303211B
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- Prior art keywords
- electrode
- clamping
- adjusting
- connecting rod
- clamping plate
- Prior art date
- 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.)
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- 239000000463 material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000009760 electrical discharge machining Methods 0.000 claims 1
- 238000010892 electric spark Methods 0.000 abstract description 10
- 238000012545 processing Methods 0.000 description 11
- 238000003754 machining Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000012356 Product development Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention provides an electrode clamping tool which can be used for installing an electrode on an electric spark machine head, and comprises the following components: the clamping piece is provided with a clamping groove capable of being used for clamping the electrode, at least one side wall of the clamping groove is provided with an adjusting hole communicated with the clamping groove, and at least one side of the clamping piece is provided with a mounting hole; the adjusting piece is movably arranged in the adjusting hole along the axial direction of the adjusting hole, and one end of the adjusting piece penetrates through the adjusting hole and stretches into the clamping groove to clamp the electrode; the connecting rod, the one end detachably of connecting rod links to each other with the mounting hole, and the other end of connecting rod can be used for linking to each other with the electric spark aircraft nose. According to the electrode clamping tool disclosed by the embodiment of the invention, the adjusting piece is movably arranged in the adjusting hole, and the adjusting piece is matched with the clamping groove to clamp the electrode.
Description
Technical Field
The invention relates to the technical field of mold processing, in particular to an electrode clamping tool.
Background
The die is basic technological equipment of the manufacturing industry, and the level of the die production technology is one of important marks for measuring the level of the national product manufacturing. The high precision, high consistency, high productivity of the parts produced with the mold is not comparable to any other processing method. The mold determines the quality, benefit and new product development capability of the product to a great extent, so the mold has the reputation of "industry master". Along with technological progress and improvement of living water products, the product is updated quickly, the product structure and appearance are more and more complex, the requirements of modern dies are hardly met by the traditional processing technology, the advantages of special processing can well make up for the traditional processing, and the electric spark processing technology is particularly outstanding in die processing with a steep structure. In the electric spark machining process, the quick clamping of the electrode is an effective way for improving the machining efficiency, but the EROWA clamp in the prior art is large in size, and in the use process, interference phenomenon of the clamp and the die can be generated. At present, no reasonable solution exists.
Disclosure of Invention
In view of the above, the invention provides an electrode clamping tool which is simple in structure and convenient for rapidly clamping an electrode.
The electrode clamping tool according to the embodiment of the invention can be used for mounting an electrode on an electric spark machine head, and comprises: the clamping piece is provided with a clamping groove capable of being used for clamping the electrode, at least one side wall of the clamping groove is provided with an adjusting hole communicated with the clamping groove, and at least one side of the clamping piece is provided with a mounting hole; the adjusting piece is movably arranged in the adjusting hole along the axial direction of the adjusting hole, and one end of the adjusting piece penetrates through the adjusting hole and stretches into the clamping groove to clamp the electrode; the connecting rod, the one end detachably of connecting rod with the mounting hole links to each other, the other end of connecting rod can be used for with the electric spark aircraft nose links to each other.
According to the electrode clamping tool disclosed by the embodiment of the invention, the adjusting piece is movably arranged in the adjusting hole, and the adjusting piece is matched with the clamping groove to clamp the electrode.
The electrode clamping tool according to the embodiment of the invention can also have the following additional technical features.
According to one embodiment of the invention, the clamping member is formed in a block shape, the clamping groove is formed on one side of the clamping member, two ends of the clamping groove are open, a plurality of adjusting holes are formed in one side wall of the clamping groove and are arranged at intervals along the length direction of the clamping groove, and the adjusting member is matched with different adjusting holes to adjust the position of the electrode in the clamping groove.
According to one embodiment of the invention, one end of the clamping piece and one side of the clamping piece, which is opposite to the clamping groove, are respectively provided with the mounting holes, and one end of the connecting rod is connected with different mounting holes so as to adjust the positions of the electrodes.
According to one embodiment of the invention, the clamp comprises: a body formed in a block shape; the first clamping plate is arranged on one side of the body and is perpendicular to the body; the second clamping plate is arranged on one side of the body and perpendicular to the body, is arranged opposite to the first clamping plate and is matched with the body to define the clamping groove, and the second clamping plate is provided with the adjusting hole.
According to one embodiment of the invention, the thickness of the second clamping plate is greater than the thickness of the first clamping plate.
According to one embodiment of the invention, the thickness of the first clamping plate is 6 cm-10 cm, and the thickness of the second clamping plate is 13 cm-17 cm.
According to one embodiment of the invention, the clamping member is an integrally formed steel material member.
According to an embodiment of the present invention, the electrode clamping tool further includes: the base plate is movably arranged in the clamping groove, one side of the base plate is connected with one end of the adjusting piece, and the other side of the base plate abuts against the electrode to clamp the electrode.
According to one embodiment of the invention, the adjustment hole is formed as a threaded hole and the adjustment member is formed as a bolt.
According to an embodiment of the present invention, the electrode clamping tool further includes: the fastening nut is sleeved at one end of the connecting rod to fix the connecting rod and the mounting hole.
Drawings
FIG. 1 is a schematic diagram of a prior art EROWA fixture clamping electrode;
FIG. 2 is a schematic diagram of the prior art EROWA fixture interfering with a mold after clamping an electrode;
FIG. 3 is a schematic view of a prior art middle clamp clamping electrode;
Fig. 4 is a schematic structural diagram of an electrode clamping tool according to an embodiment of the invention;
FIG. 5 is a schematic view of a structure of an electrode clamping tool for clamping an electrode according to an embodiment of the invention;
FIG. 6 is a left side view of FIG. 5;
FIG. 7 is a top view of FIG. 5;
FIG. 8 is a schematic view of another structure of an electrode clamping tool for clamping an electrode according to an embodiment of the invention;
FIG. 9 is a left side view of FIG. 8;
Fig. 10 is a top view of fig. 8.
Reference numerals:
An electrode clamping fixture 100;
a clamp 10; a body 11; a first clamping plate 12; a second clamping plate 13; a mounting hole 14;
an adjusting member 20;
A connecting rod 30;
A backing plate 40;
A fastening nut 50;
An electrode 200;
A mold 300;
EROWA fixture 400.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The present application is an application made by the inventors of the present application based on the following facts.
As shown in fig. 1 to 3, the electrode clamping in the prior art mainly uses the EROWA fixture 400, and as shown in fig. 1, the EROWA fixture 400 has the advantages of safety, reliability, stability, rapidness and the like, but when the EROWA fixture 400 is used, the electrode needs to be clamped at the center of the fixture, if the electrode is not clamped at the center, single-side fetch calibration is needed during numerical control machining, single-read fetch calibration is needed during electric machining, and the advantage of rapid clamping is lost. Meanwhile, the EROWA fixture 400 has a large volume, a single-side wall thickness of 15mm and an external length and width of 60mm multiplied by 60mm, can not turn over and clamp, can only clamp with an electric spark machine head vertically through the bottom surface, and can sometimes generate interference phenomenon between the EROWA fixture 400 and a die, as shown in fig. 2. If interference is to be avoided, the electrode needs to be heightened, so that electrode materials are increased, and electrode cost is increased; meanwhile, the length of the numerical control machining tool is also considered, and too high an electrode beyond the extending length of the tool can cause the electrode to be incapable of being machined. The current solutions are: when in numerical control processing, the EROWA fixture 400 is used, the EROWA fixture 400 is removed before electric spark processing, the electrode is perforated, and the electric spark machine head and the electrode are connected by a connecting rod, as shown in figure 3, so that the space can be saved, interference is avoided, but the perforation workload is increased.
Based on the above technical problems existing in the prior art, the inventor of the present application has studied and improved the prior art fixture and proposed an electrode clamping tool 100.
An electrode clamping tool 100 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 4 to 10, the electrode clamping fixture 100 according to the embodiment of the present invention can be used to mount the electrode 200 on the electric discharge machine head, and the electrode clamping fixture 100 includes a clamping member 10, an adjusting member 20, and a connecting rod 30.
Specifically, the clamping member 10 is provided with a clamping groove capable of being used for clamping the electrode 200, at least one side wall of the clamping groove is provided with an adjusting hole communicated with the clamping groove, at least one side of the clamping member 10 is provided with a mounting hole 14, the adjusting member 20 is movably arranged in the adjusting hole along the axial direction of the adjusting hole, one end of the adjusting member 20 penetrates through the adjusting hole and stretches into the clamping groove to clamp the electrode 200, one end of the connecting rod 30 is detachably connected with the mounting hole 14, and the other end of the connecting rod 30 can be used for being connected with an electric discharge machine head.
In other words, the electrode clamping tool 100 mainly comprises a clamping piece 10, an adjusting piece 20 and a connecting rod 30, wherein the clamping piece 10 is provided with a clamping groove, the clamping groove can be used for clamping an electrode 200, the clamping piece 10 is provided with an adjusting hole communicated with the clamping groove, one end of the adjusting piece 20 penetrates through the adjusting hole and can be stopped against the electrode 200, the other end of the adjusting piece 20 is arranged on the outer side of the clamping groove, the adjusting piece 20 is manually adjusted according to the size of the clamped electrode 200, the adjusting piece 20 and the clamping groove are matched to clamp the electrode 200 together, the connecting rod 30 is connected with the clamping piece 10 and an electric spark machine head, the electrode 200 is processed after being subjected to surface marking calibration, after one electrode 200 is processed, the adjusting piece 20 is directly loosened, the electrode 200 is taken down, and the electrode 200 is replaced with a new electrode 200 to be continuously processed. The electrode clamping tool 100 reduces the workload of punching and tapping, is suitable for electrodes 200 with different sizes, and can be applied to solving the problems of clamping interference and the like in wire cutting and numerical control machining.
Therefore, according to the electrode clamping tool 100 of the embodiment of the invention, the adjusting piece 20 is movably arranged in the adjusting hole, and the adjusting piece 20 is matched with the clamping groove to clamp the electrode 200, so that the electrode clamping tool 100 is simple in structure, convenient to operate, capable of rapidly clamping and disassembling the electrodes 200 with different sizes, and wide in application.
According to an embodiment of the present invention, the clamping member 10 is formed in a block shape, the clamping groove is provided at one side of the clamping member 10 with both ends open, one sidewall of the clamping groove is provided with a plurality of adjustment holes spaced apart along the length direction of the clamping groove, and the adjustment member 20 cooperates with the different adjustment holes to adjust the position of the electrode 200 in the clamping groove. That is, the three sides of the clamping groove are all open, so that the electrode 200 can be conveniently clamped (vertically installed or turned over) from different directions, as shown in fig. 5 to 7, the electrode clamping tool 100 clamps the electrode 200 from the vertical direction, as shown in fig. 8 to 10, the electrode turning over clamps the electrode 200 from the transverse direction, the electrode clamping tool 100 has a simple structure, and a proper clamping mode can be selected according to specific needs.
Preferably, one end of the clamping member 10 and one side facing away from the clamping groove are respectively provided with mounting holes 14, and one end of the connecting rod 30 is connected with different mounting holes 14 to adjust the position of the electrode 200. That is, when the clamping member 10 clamps the electrode 200 from different directions, the connecting rod 30 is installed in different mounting holes 14, and a side clamping manner is added to realize turning-over clamping of the electrode 200.
According to one embodiment of the present invention, the clamping member 10 includes a body 11, a first clamping plate 12 and a second clamping plate 13.
Specifically, the body 11 is formed in a block shape, the first clamping plate 12 is arranged on one side of the body 11 and is perpendicular to the body 11, the second clamping plate 13 is opposite to the first clamping plate 12 and is matched with the body 11 to define a clamping groove, and the second clamping plate 13 is provided with an adjusting hole.
In other words, the clamping member 10 is mainly composed of a body 11, a first clamping plate 12 and a second clamping plate 13, the clamping member 10 is approximately shaped like a "匚", wherein the first clamping plate 12 and the second clamping plate 13 are respectively arranged perpendicular to the body 11 and are connected with two sides of the body 11, the first clamping plate 12, the second clamping plate 13 and the body 11 jointly define a clamping groove, an adjusting hole is formed in the second clamping plate 13, and the adjusting member 20 is installed in the adjusting hole so as to adjust and clamp the electrode 200.
Preferably, the thickness of the second clamping plate 13 is greater than the thickness of the first clamping plate 12.
That is, the clamping member 10 has an asymmetric structure, and the clamping plate adjacent to the mold 300 is generally thinner, so as to fix the electrode 200 and avoid interference between the tool and the mold 300.
In one embodiment of the present invention, the thickness of the first clamping plate 12 is 6cm to 10cm, and the thickness of the second clamping plate 13 is 13cm to 17cm. Specifically, the thickness of the first clamping plate 12 may be 8cm, and the thickness of the second clamping plate 13 may be 15cm.
Preferably, the clamping member 10 is an integrally formed steel material member, and the strength of the steel material member is greater than that of aluminum or brass, so that the strength of the tool can be ensured, the volume of the tool can be reduced, the operation space is saved, the increase of the material consumption of the electrode 200 caused by interference with the die 300 during processing is avoided, and the processing cost is reduced.
According to an embodiment of the present invention, the electrode clamping fixture 100 further includes a backing plate 40, the backing plate 40 is movably disposed in the clamping groove, one side of the backing plate 40 is connected to one end of the adjusting member 20, and the other side of the backing plate 40 abuts against the electrode 200 to clamp the electrode 200.
In other words, the backing plate 40 may be disposed in the clamping groove, and the end of the regulator 20 that extends into the clamping groove abuts against the backing plate 40, facilitating uniform force application to the electrode 200.
Preferably, the adjustment holes are formed as threaded holes and the adjustment member 20 is formed as a bolt that is easily installed and removed, and the bolt works the same as the EROWA fixture 400 to enable rapid clamping of the electrode 200. In the specific operation process, the electrode 200 is placed in the clamping groove, the backing plate 40 and the electrode 200 are rapidly clamped through the bolts, the clamping efficiency of the electrode 200 is improved, and the processing period is shortened.
According to an embodiment of the present invention, the electrode clamping fixture 100 further includes a fastening nut 50, where the fastening nut 50 is sleeved on one end of the connecting rod 30 to fix the connecting rod 30 and the mounting hole 14.
According to the electrode clamping tool 100 of the embodiment of the invention, the adjusting piece 20 is movably arranged in the adjusting hole, and the adjusting piece 20 is matched with the clamping groove to clamp the electrode 200, so that the electrode clamping tool 100 is simple in structure, convenient to operate, capable of rapidly clamping and disassembling the electrodes 200 with different sizes, and wide in application range.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (5)
1. An electrode clamping fixture for mounting an electrode on an electric discharge machine head, the electrode clamping fixture comprising:
The holder, be equipped with on the holder and be used for the centre gripping groove of electrode, the centre gripping groove is established one side and both ends of holder are opened, the holder includes:
a body formed in a block shape;
the first clamping plate is arranged on one side of the body and is perpendicular to the body;
The second clamping plate is arranged on one side of the body and perpendicular to the body, the second clamping plate is arranged opposite to the first clamping plate and is matched with the body to define the clamping groove, a plurality of adjusting holes are formed in the second clamping plate at intervals along the length direction of the clamping groove, and the thickness of the second clamping plate is larger than that of the first clamping plate;
the electrode clamping tool further comprises:
The adjusting piece is movably arranged in the adjusting hole along the axial direction of the adjusting hole, one end of the adjusting piece penetrates through the adjusting hole and stretches into the clamping groove to clamp the electrode, and the adjusting piece is matched with different adjusting holes to adjust the position of the electrode in the clamping groove;
The base plate is movably arranged in the clamping groove, one side of the base plate is connected with one end of the adjusting piece, and the other side of the base plate is abutted against the electrode to clamp the electrode;
The connecting rod, the one end of holder and dorsad one side of grip slot are equipped with the mounting hole respectively, the one end detachably of connecting rod with the mounting hole links to each other, the other end of connecting rod can be used for with the spark-erosion machine head links to each other the one end of connecting rod links to each other with the different the mounting hole is in order to adjust the position of electrode.
2. The electrode clamping tool according to claim 1, wherein the thickness of the first clamping plate is 6 cm-10 cm, and the thickness of the second clamping plate is 13 cm-17 cm.
3. The electrode clamping tool according to claim 1, wherein the clamping member is an integrally formed steel material member.
4. The electrode clamping tool according to claim 1, wherein the adjustment hole is formed as a threaded hole and the adjustment member is formed as a bolt.
5. The electrode clamping tool of claim 1, further comprising:
the fastening nut is sleeved at one end of the connecting rod to fix the connecting rod and the mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910627952.9A CN110303211B (en) | 2019-07-12 | 2019-07-12 | Electrode clamping tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910627952.9A CN110303211B (en) | 2019-07-12 | 2019-07-12 | Electrode clamping tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110303211A CN110303211A (en) | 2019-10-08 |
| CN110303211B true CN110303211B (en) | 2024-09-06 |
Family
ID=68080058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910627952.9A Active CN110303211B (en) | 2019-07-12 | 2019-07-12 | Electrode clamping tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110303211B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204183059U (en) * | 2014-11-13 | 2015-03-04 | 佛山职业技术学院 | Spark machined electrode special fixture |
| CN204800090U (en) * | 2015-08-12 | 2015-11-25 | 山东玲珑机电有限公司 | Cutter anchor clamps and spark -erosion machining equipment |
| CN210412931U (en) * | 2019-07-12 | 2020-04-28 | 常州星宇车灯股份有限公司 | Electrode clamping tool |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002126948A (en) * | 2000-10-24 | 2002-05-08 | Honda Motor Co Ltd | Tool retaining jig |
| KR20140146444A (en) * | 2013-06-17 | 2014-12-26 | 이원택 | Electrode holder for electric discharge machine |
| DE102014000249B3 (en) * | 2014-01-08 | 2015-04-02 | Daniel Weis | Concentric electrode holding device for die sinking EDM machines |
| CN206702363U (en) * | 2017-04-26 | 2017-12-05 | 广州铭祥汽车零部件有限公司 | A kind of spark machine electrode machining fixture |
-
2019
- 2019-07-12 CN CN201910627952.9A patent/CN110303211B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204183059U (en) * | 2014-11-13 | 2015-03-04 | 佛山职业技术学院 | Spark machined electrode special fixture |
| CN204800090U (en) * | 2015-08-12 | 2015-11-25 | 山东玲珑机电有限公司 | Cutter anchor clamps and spark -erosion machining equipment |
| CN210412931U (en) * | 2019-07-12 | 2020-04-28 | 常州星宇车灯股份有限公司 | Electrode clamping tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110303211A (en) | 2019-10-08 |
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