CN108381235B - Boring fixture for bent chain plate - Google Patents
Boring fixture for bent chain plate Download PDFInfo
- Publication number
- CN108381235B CN108381235B CN201810437645.XA CN201810437645A CN108381235B CN 108381235 B CN108381235 B CN 108381235B CN 201810437645 A CN201810437645 A CN 201810437645A CN 108381235 B CN108381235 B CN 108381235B
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- Prior art keywords
- floating
- supporting
- plate
- pressing
- workpiece
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/10—Auxiliary devices, e.g. bolsters, extension members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2703/00—Work clamping
- B23Q2703/02—Work clamping means
- B23Q2703/10—Devices for clamping workpieces of a particular form or made from a particular material
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses a curved link plate boring fixture which comprises a base, a first screw, a second screw, a floating self-positioning device and two floating pressing devices, wherein a first workpiece supporting surface and a second workpiece supporting surface with the height lower than that of the first workpiece supporting surface are arranged on the base, the floating pressing devices comprise a floating pressing plate and a pressing cushion block, pressing plate supporting parts are respectively arranged on two sides of the lower end surface of the floating pressing plate, cambered surface protrusions are arranged on the upper end surface of the floating pressing plate, positioning grooves matched with the cambered surface protrusions are formed in the lower end surface of the pressing cushion block, the lower end of the first screw sequentially penetrates through a locking nut, the pressing cushion block and the floating pressing plate and then is connected to the first workpiece supporting surface, and the lower end of the second screw sequentially penetrates through the locking nut, the pressing cushion block and the floating pressing plate and then is connected to the second workpiece supporting surface. The boring fixture for the bent chain plate can clamp two workpieces to be machined at one time, and can improve machining precision of the workpieces.
Description
Technical Field
The invention relates to the technical field of chain production, in particular to a boring jig for a bent chain plate.
Background
The bent plate chain is one of the chains widely used in the market at present, and consists of bent plate, sleeve and pin shaft, wherein the large hole of the bent plate is in interference fit with the sleeve, the small hole of the bent plate is in interference fit with the pin shaft, and the large hole and the small hole of two adjacent bent plate are required to be concentric for assembly during processing the bent plate. At present, when a bent chain plate to be processed is bored, a common flat pressing plate is basically adopted for pressing, and the bent chain plate is supported by adopting equal-height blocks according to the height difference of the two ends of the bent chain plate. Before boring, clamping two bending link plates at a time, wherein the thickness of the two bending link plates is different, the range value of the thickness difference is 0-1.5mm, the contact between the flat pressing plate and the workpiece is mostly linear contact due to the different thickness of the two bending link plates, the pressing force of the flat pressing plate on the workpiece deviates from the position of the hole, the pressing force is greatly reduced, and when the workpiece encounters cutting resistance, the workpiece is easy to vibrate, so that vibration marks are generated on the aperture surface of the workpiece, and the aperture surface roughness and the aperture size precision of the workpiece are further influenced; meanwhile, due to the reduction of the pressing force, the cutting speed and the cutting amount are limited, and the processing efficiency is greatly reduced. In addition, the bending heights of two bent chain plates clamped at one time are different, the range of the height difference is 0-2mm, the height of the equal-height blocks is generally determined according to the average value of the actual heights of bent chain plates after the bent chain plates are bent in the same batch, and the median value of the actual heights of the bent chain plates in the same batch is generally selected.
Disclosure of Invention
The invention aims to provide a boring fixture for a bent chain plate, which can effectively solve the technical problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a curved link plate boring jig, its includes base, first screw rod, second screw rod, float self-positioning device and two float closing device, be equipped with first work piece supporting surface and the second work piece supporting surface that is less than first work piece supporting surface in the height on the base, float self-positioning device includes float clamp plate and packing block, the lower terminal surface both sides of float clamp plate are equipped with the clamp plate supporting part respectively, the up end of float clamp plate is equipped with the cambered surface arch, the lower terminal surface of packing block has seted up the constant head tank with cambered surface arch matched with, the lower extreme of first screw rod passes lock nut in proper order, compresses tightly cushion and float clamp plate back and connects on first work piece supporting surface, the lower extreme of second screw rod passes lock nut, compresses tightly cushion and float clamp plate back and connects on second work piece supporting surface in proper order, float self-positioning device includes float supporting shoe, eccentric shaft, backup pad and the base of placing on the second work piece supporting surface, the both ends of base are provided with the backup pad respectively, set up first eccentric shaft constant head tank on the backup pad, the eccentric shaft both ends of eccentric shaft set up the extension spring on the backup pad on the eccentric shaft respectively, the eccentric shaft sets up the extension spring on the support groove on the both sides of the backup pad of both sides on the base, the support pad of the upper end of the support plate of the float clamp plate is equipped with the corresponding to the support shoe, the support groove on the two sides of float supporting shoe, the end is equipped with the support groove on the support groove respectively.
Preferably, the upper end and the lower end of the tension spring are respectively connected with a first stud and a second stud, the first stud is connected with the floating support block through threads, and the second stud is connected with the base through threads.
Preferably, the lower end of the first screw is connected with the first workpiece supporting surface through threads.
Preferably, the lower end of the second screw is connected with the second workpiece supporting surface through threads.
Compared with the prior art, the invention has the beneficial effects that:
1. when the thicknesses of two bent chain plates clamped at one time are different, namely, the thickness difference exists, the floating pressing plate in the floating pressing device automatically swings for a certain angle, so that the pressing point of the pressing plate supporting part on the bent chain plate is always positioned at the position of a hole to be machined on the bent chain plate, after the swinging angle of the floating pressing plate, the cambered surface bulge on the floating pressing plate is always contacted with the positioning groove on the pressing cushion block, the surface contact between the locking nut and the pressing cushion block is not influenced, the pressing force of the floating pressing device on the bent chain plate is ensured, the vibration easily occurs during workpiece machining, the machining precision and the surface roughness of the hole on the bent chain plate are improved, and the cutting amount and the cutting speed of a workpiece are improved due to firm clamping of the bent chain plate to be machined, so that the production efficiency is improved.
2. Because the thickness of the workpiece is large, the height dispersion difference after bending is large, the floating self-positioning device can well support the workpiece, when the bending heights of two bent chain plates clamped at one time are different, the floating supporting blocks can swing along the outer circle surfaces of the eccentric shafts to be adjusted, so that the supporting block supporting parts on the two sides of the upper end surfaces of the floating supporting blocks are supported on the two bent chain plates, the eccentric shafts adjust the floating supporting blocks to the required height through the eccentricity, the two bent chain plates are fully and rigidly contacted with the floating supporting blocks, the clamping stability of the bent chain plates is improved, the workpiece is further ensured to be difficult to vibrate in the processing process, the aperture surface roughness and the aperture size precision of the bent chain plates are improved, the assembly precision of the bent chain is improved, and the tension springs are used for resetting the floating supporting blocks and clamping the floating supporting blocks on the eccentric shafts.
Drawings
FIG. 1 is a front view of a link plate boring jig according to an embodiment of the invention;
FIG. 2 is a top view of a link plate boring jig according to an embodiment of the invention;
FIG. 3 is a left side view of a link plate boring jig according to an embodiment of the invention;
FIG. 4 is a right side view of a link plate boring jig according to an embodiment of the invention;
FIG. 5 is a schematic view showing the structure of a link plate in the embodiment of the present invention;
FIG. 6 is a schematic view of a conventional flat platen pressing bent link plate in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view of the installation of a link plate on a link plate chain in accordance with an embodiment of the present invention;
in the figure, 1, a base, 2, a first screw, 3, a second screw, 4, a first workpiece supporting surface, 5, a second workpiece supporting surface, 6, a floating pressing plate, 7, a pressing cushion block, 8, a pressing plate supporting part, 9, a cambered surface protrusion, 10, a locking nut, 11, a floating supporting block, 12, an eccentric shaft, 13, a supporting plate, 14, a base, 15, a supporting block supporting part, 16, a tension spring, 17, a first stud, 18, a second stud, 19 and a bent link plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-7, a boring fixture for a bent link plate comprises a base 1, a first screw rod 2, a second screw rod 3, a floating self-positioning device and two floating pressing devices, wherein a first workpiece supporting surface 4 and a second workpiece supporting surface 5 with the height lower than that of the first workpiece supporting surface 4 are arranged on the base 1, the floating pressing devices comprise a floating pressing plate 6 and a pressing cushion block 7, pressing plate supporting parts 8 are respectively arranged on two sides of the lower end surface of the floating pressing plate 6, cambered surface protrusions 9 are arranged on the upper end surface of the floating pressing plate 6, positioning grooves matched with the cambered surface protrusions 9 are formed on the lower end surface of the pressing cushion block 7, the lower end of the first screw rod 2 sequentially penetrates through a locking nut 10, the pressing cushion block 7 and the floating pressing plate 6 and then is connected to the first workpiece supporting surface 4, the lower end of the second screw rod 3 sequentially penetrates through the locking nut 10, the pressing cushion block 7 and the floating pressing plate 6 and then is connected to the second workpiece supporting surface 5, the floating self-positioning device comprises a floating supporting block 11, an eccentric shaft 12, a supporting plate 13 and a base 14 arranged on a second workpiece supporting surface 5, wherein the two ends of the base 14 are respectively provided with the supporting plate 13, the supporting plate 13 is provided with a first eccentric shaft positioning groove, the two ends of the eccentric shaft 12 are respectively arranged in the first eccentric shaft positioning grooves on the supporting plate 13 positioned at the two ends of the base 14, the lower end surface of the floating supporting block 11 is provided with a second eccentric shaft positioning groove, the two sides of the upper end surface of the floating supporting block 11 are respectively provided with a supporting block supporting part 15 for supporting a workpiece, the second eccentric shaft positioning grooves on the floating supporting block 11 are clamped on the eccentric shaft 12, the two sides of the eccentric shaft 12 are respectively correspondingly provided with a tension spring 16, the upper ends of the tension springs 16 are connected with the floating supporting block 11, the lower end of the tension spring 16 is connected to the base 14.
The upper end and the lower end of the tension spring 16 are respectively connected with a first stud 17 and a second stud 18, the first stud 17 is in threaded connection with the floating support block 11, the second stud 18 is in threaded connection with the base 14, the lower end of the first screw 2 is in threaded connection with the first workpiece supporting surface 4, and the lower end of the second screw 3 is in threaded connection with the second workpiece supporting surface 5.
The operation process comprises the following steps:
the floating pressing device above the first workpiece supporting surface 4 is fastened firstly, the eccentric shaft 12 is rotated, after the floating supporting block 11 effectively supports the workpiece, the floating pressing device above the second workpiece supporting surface 5 is fastened, after the workpiece is machined, the floating pressing device above the second workpiece supporting surface 5 is loosened firstly, the floating supporting block 11 is reset under the action of the tension spring 16, then the floating pressing device above the first workpiece supporting surface 4 is loosened, and the workpiece is unloaded.
The specific operation is as follows: one end of the two bent chain plates 19 to be processed, which is lower in height, is placed on the first workpiece supporting surface 4, a floating pressing device above the first workpiece supporting surface 4 is fastened, the pressing plate supporting parts 8 on two sides of the lower end surface of the floating pressing plate 6 respectively press the two bent chain plates 19, one sides of the two bent chain plates 19 are pressed by the locking nuts 10 at the same time, then the eccentric shafts 12 are rotated, the supporting block supporting parts 15 on the floating supporting blocks 11 are used for effectively supporting workpieces, and similarly, the floating pressing device above the second workpiece supporting surface is fastened, so that the other sides of the two bent chain plates 19 are pressed.
When the thicknesses of the two bent link plates 19 clamped at one time are different, namely, the thickness difference exists, the floating pressing plate 6 in the floating pressing device automatically swings for a certain angle to ensure that the pressing point of the pressing plate supporting part 8 on the bent link plate 19 is always positioned at the position of a hole to be machined on the bent link plate 19, after the swinging angle of the floating pressing plate 6, the cambered surface bulge 9 on the floating pressing plate 6 is always in good contact with the positioning groove on the pressing cushion block 7, the surface contact between the lock nut 10 and the pressing cushion block 7 is not influenced, so that the pressing force of the floating pressing device on the bent link plate 19 is ensured, vibration is easy to occur during workpiece machining, the machining precision and the surface roughness of the hole on the bent link plate 19 are improved, and the cutting amount and the cutting speed of a workpiece are improved due to firm clamping of the bent link plate 19 to be machined, and the production efficiency is improved.
Because the thickness of the workpiece is large, the height dispersion difference after bending is large, the floating self-positioning device can well support the workpiece, when the bending heights of the two bent chain plates 19 clamped at one time are inconsistent, the floating support blocks 11 can swing along the outer circle surfaces of the eccentric shafts 12 to be adjusted, so that the support block support parts 15 on the two sides of the upper end surfaces of the floating support blocks 11 are firmly supported on the two bent chain plates 19, the eccentric shafts 12 adjust the floating support blocks 11 to the required height through the eccentricity, so that the two bent chain plates 19 are in full rigid contact with the floating support blocks 11, the clamping stability of the bent chain plates 19 is improved, the tension springs 16 are used for supporting the reset of the floating blocks 11, vibration of the workpiece is not easy to occur in the machining process, the aperture surface roughness and aperture size precision of the bent chain plates 19 are improved, and the assembly precision of the bent chain is improved.
The invention overcomes the defect that workpieces are easy to vibrate and the processing precision of the workpieces is affected due to the fact that the bending plate is not firmly clamped due to the fact that the bending plate 19 is pressed by the conventional common flat pressing plate 20 and the bending plate 19 is supported by the equal-height blocks.
The foregoing is merely illustrative and explanatory of the invention, as it is well within the scope of the invention, as it is intended to provide those skilled in the art with various modifications, additions and substitutions to the specific embodiments disclosed and those skilled in the art without departing from the scope of the invention as disclosed in the accompanying claims.
Claims (4)
1. The utility model provides a curved link joint boring jig which characterized in that: the floating self-positioning device comprises a base, a first screw, a second screw, a floating self-positioning device and two floating pressing devices, wherein a first workpiece supporting surface and a second workpiece supporting surface with the height lower than that of the first workpiece supporting surface are arranged on the base, the floating self-positioning device comprises a floating pressing plate and a pressing cushion block, pressing plate supporting parts are respectively arranged at two sides of the lower end surface of the floating pressing plate, cambered surface protrusions are arranged on the upper end surface of the floating pressing plate, positioning grooves matched with the cambered surface protrusions are formed in the lower end surface of the pressing cushion block, the lower end of the first screw sequentially penetrates through a locking nut, the pressing cushion block and the floating pressing plate and then is connected to the first workpiece supporting surface, the lower end of the second screw sequentially penetrates through the locking nut, the pressing cushion block and the floating pressing plate and then is connected to the second workpiece supporting surface, the floating self-positioning device comprises a floating supporting block, an eccentric shaft, a supporting plate and a base placed on the second workpiece supporting surface, supporting plates are respectively arranged at two ends of the base, a first eccentric shaft positioning groove is formed in the supporting plate, two ends of the eccentric shaft are respectively arranged in the first eccentric shaft positioning grooves on the supporting plates at two ends of the base, the two ends of the eccentric shaft positioning plates are respectively, the two ends of the eccentric shaft positioning blocks are respectively arranged on the two sides of the supporting springs, and the two sides of the supporting springs are correspondingly connected to the two upper ends of the supporting blocks and are respectively arranged on the two upper ends of the supporting springs and are respectively.
2. The link plate boring jig according to claim 1, wherein: the upper end and the lower end of the tension spring are respectively connected with a first stud and a second stud, the first stud is connected with the floating support block through threads, and the second stud is connected with the base through threads.
3. The link plate boring jig according to claim 2, wherein: the lower end of the first screw rod is connected with the first workpiece supporting surface through threads.
4. A link plate boring jig according to claim 3, wherein: the lower end of the second screw rod is connected with the second workpiece supporting surface through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810437645.XA CN108381235B (en) | 2018-05-09 | 2018-05-09 | Boring fixture for bent chain plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810437645.XA CN108381235B (en) | 2018-05-09 | 2018-05-09 | Boring fixture for bent chain plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108381235A CN108381235A (en) | 2018-08-10 |
| CN108381235B true CN108381235B (en) | 2023-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810437645.XA Active CN108381235B (en) | 2018-05-09 | 2018-05-09 | Boring fixture for bent chain plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108381235B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109352360B (en) * | 2018-11-15 | 2021-01-01 | 中国航空工业集团公司洛阳电光设备研究所 | Machining method for reducing resonance of invar alloy low-rigidity cantilever part |
| CN110883588B (en) * | 2019-12-18 | 2021-06-15 | 长沙思胜智能设备有限公司 | Universal floating fixture |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02279245A (en) * | 1989-04-20 | 1990-11-15 | Toyoda Mach Works Ltd | Clamp device |
| CN101695815A (en) * | 2009-10-13 | 2010-04-21 | 常熟理工学院 | Clamp mechanism for processing piston pin hole of compressor |
| CN201685120U (en) * | 2010-05-31 | 2010-12-29 | 广东鸿特精密技术股份有限公司 | Reverse buckled clamping and locking clamper |
| CN201783835U (en) * | 2010-07-29 | 2011-04-06 | 天津市中马骏腾精密机械制造有限公司 | Eccentric positioning and clamping fixture |
| CN102729071A (en) * | 2012-07-23 | 2012-10-17 | 杭州和泰机电工业有限公司 | Automatic clamping tool for chain plate processing |
| KR20130011461A (en) * | 2011-07-21 | 2013-01-30 | 노규태 | Chain supporting device of chain for face cutting machine |
| CN104551738A (en) * | 2014-12-29 | 2015-04-29 | 苏州用朴合金工具有限公司 | Multi-workpiece linkage clamping device |
| CN205834753U (en) * | 2016-06-28 | 2016-12-28 | 扬州大学 | One positions multifunctional efficient fixture completely |
| CN106312655A (en) * | 2015-06-28 | 2017-01-11 | 江苏新光华机械有限公司 | Equal-height eccentric floating supporting device for machining lower connecting plate |
| CN208214866U (en) * | 2018-05-09 | 2018-12-11 | 安徽黄山恒久链传动有限公司 | A kind of cranked plate boring jig |
-
2018
- 2018-05-09 CN CN201810437645.XA patent/CN108381235B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02279245A (en) * | 1989-04-20 | 1990-11-15 | Toyoda Mach Works Ltd | Clamp device |
| CN101695815A (en) * | 2009-10-13 | 2010-04-21 | 常熟理工学院 | Clamp mechanism for processing piston pin hole of compressor |
| CN201685120U (en) * | 2010-05-31 | 2010-12-29 | 广东鸿特精密技术股份有限公司 | Reverse buckled clamping and locking clamper |
| CN201783835U (en) * | 2010-07-29 | 2011-04-06 | 天津市中马骏腾精密机械制造有限公司 | Eccentric positioning and clamping fixture |
| KR20130011461A (en) * | 2011-07-21 | 2013-01-30 | 노규태 | Chain supporting device of chain for face cutting machine |
| CN102729071A (en) * | 2012-07-23 | 2012-10-17 | 杭州和泰机电工业有限公司 | Automatic clamping tool for chain plate processing |
| CN104551738A (en) * | 2014-12-29 | 2015-04-29 | 苏州用朴合金工具有限公司 | Multi-workpiece linkage clamping device |
| CN106312655A (en) * | 2015-06-28 | 2017-01-11 | 江苏新光华机械有限公司 | Equal-height eccentric floating supporting device for machining lower connecting plate |
| CN205834753U (en) * | 2016-06-28 | 2016-12-28 | 扬州大学 | One positions multifunctional efficient fixture completely |
| CN208214866U (en) * | 2018-05-09 | 2018-12-11 | 安徽黄山恒久链传动有限公司 | A kind of cranked plate boring jig |
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| Publication number | Publication date |
|---|---|
| CN108381235A (en) | 2018-08-10 |
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