CN108486350B - Quenching device for machining step drill - Google Patents
Quenching device for machining step drill Download PDFInfo
- Publication number
- CN108486350B CN108486350B CN201810561514.2A CN201810561514A CN108486350B CN 108486350 B CN108486350 B CN 108486350B CN 201810561514 A CN201810561514 A CN 201810561514A CN 108486350 B CN108486350 B CN 108486350B
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- CN
- China
- Prior art keywords
- quenching furnace
- cooling device
- conveying mechanism
- electric telescopic
- mechanical arm
- 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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- 238000010791 quenching Methods 0.000 title claims abstract description 84
- 230000000171 quenching effect Effects 0.000 title claims abstract description 84
- 238000003754 machining Methods 0.000 title description 6
- 238000001816 cooling Methods 0.000 claims abstract description 59
- 230000007246 mechanism Effects 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 16
- 210000000078 claw Anatomy 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000007599 discharging Methods 0.000 claims description 3
- 101100520231 Caenorhabditis elegans plc-3 gene Proteins 0.000 description 6
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a quenching device for processing a step drill, which comprises a quenching furnace, a cooling device and a PLC (programmable logic controller), wherein the cooling device is arranged on the right side of the quenching furnace, an alarm is arranged above the cooling device, conveying mechanisms are arranged on the left side of the quenching furnace and between the quenching furnace and the cooling device, a material receiving box is arranged on the conveying mechanisms, electric telescopic doors are arranged on the two side surfaces of a quenching furnace shell and the cooling device, an infrared sensor is arranged at the bottom of the electric telescopic door on the left side, a pushing mechanism is arranged on the left side of a feeding end of the quenching furnace and is arranged above the conveying mechanism, the pushing mechanism comprises a lifting motor, a pushing motor and a pushing block, a mechanical arm is arranged between the quenching furnace and the cooling device and is arranged above the conveying mechanism through a fixing seat, and a clamping claw is arranged on the mechanical arm.
Description
Technical Field
The invention relates to the technical field of quenching devices, in particular to a quenching device for machining a step drill.
Background
The step drill is also called a step drill or a pagoda drill, is mainly used for drilling holes in thin steel plates within 3mm, can replace a plurality of drill bits to be used, can process holes with different diameters according to requirements, can realize one-step processing of large holes, does not need to replace drill bits, drill positioning holes and the like, and is required to be quenched in the processing, the quenching device is required to manually convey the step drill into the device, and is manually fed after quenching is finished, and the step drill is conveyed into the cooling device to be cooled, so that time and labor are wasted.
Disclosure of Invention
The invention aims to provide a quenching device for machining a step drill, which has a simple and reasonable structure, and can automatically convey the machined step drill into a quenching furnace for quenching, and convey the quenched step drill into a cooling device for rapid cooling.
The purpose of the invention is realized in the following way:
The quenching device for the machining step drill comprises a quenching furnace, a cooling device and a PLC (programmable logic controller), wherein the cooling device is arranged on the right side of the quenching furnace, an alarm is arranged above the cooling device, the quenching furnace comprises a quenching furnace shell, a high-frequency heating device and a heating table, the PLC is arranged on the quenching furnace shell, the heating table is arranged in the quenching furnace shell and at the bottom of the quenching furnace, and the high-frequency heating device is arranged in the heating table.
Further, electric telescopic doors are arranged on two side surfaces of the quenching furnace shell and the cooling device, the electric telescopic door on the left side is a feeding end of the quenching furnace and the cooling device, the electric telescopic door on the right side is a discharging end of the quenching furnace and the cooling device, the output end of the conveying mechanism is aligned to the electric telescopic door on the left side, the conveying surface of the conveying mechanism and the lower bottom surface of the electric telescopic door are on the same horizontal line, and the electric telescopic door is connected with the PLC;
Further, an infrared sensor for sensing the receiving box is arranged at the bottom of the electric telescopic door at the left side, the height of the infrared sensor is slightly higher than that of the conveying surface of the conveying mechanism, and the infrared sensor is connected with the PLC;
Further, the table top of the heating table is flush with the output surface of the conveying mechanism
Further, a propelling mechanism is arranged on the left side of the feeding end of the quenching furnace and comprises a lifting motor, a propelling motor and a propelling block, the lifting motor is arranged above the conveying mechanism, the propelling motor is arranged right below the lifting motor, the upper end of the propelling motor is connected with the output end of the lifting motor, the propelling block is concave, the concave surface of the propelling block faces the direction of the feeding inlet of the quenching furnace, and the lifting motor and the propelling motor are connected with a PLC;
Further, the width of the concave part of the pushing block is larger than the width of the material receiving box and smaller than or equal to the width of the conveying surface of the conveying mechanism;
Further, a mechanical arm is arranged between the quenching furnace and the cooling device, the mechanical arm is arranged above the conveying mechanism through a fixed seat, the head end of the mechanical arm is rotatably connected with the fixed seat, a clamping claw for clamping the step drill is arranged on the mechanical arm, the clamping claw is rotatably arranged at the tail end of the mechanical arm, the mechanical arm controls the rotation, clamping and loosening of the clamping claw, and the mechanical arm is connected with a PLC;
furthermore, the material receiving box is made of high-temperature resistant materials.
The invention works according to the following principle:
When the front of the electric telescopic door of the feeding end of the quenching furnace is collected, the infrared sensor at the bottom of the electric telescopic door senses the receiving box and sends a signal to the PLC controller, the PLC controller controls the electric telescopic door at the left side of the quenching furnace to open, the PLC controller controls the lifting motor to descend to the position where the pushing motor is flush with the receiving box, the pushing motor drives the pushing block to descend together, the pushing block is pushed to the right by the pushing motor after the pushing block descends, the pushing block clamps the main receiving box to push the receiving box into the middle of the heating table in the quenching furnace, the PLC controller controls the pushing motor to retract to the original position, the PLC controller controls the lifting motor to ascend to the original position, the PLC controller sends a signal to the electric telescopic door, the PLC controller controls the high-frequency heating device to heat, the PLC controller controls the high-frequency heating device to stop heating after a certain time, the electric telescopic door at the right side is opened, the PLC controller controls the mechanical arm to clamp the receiving box, the infrared sensor is clamped by the cooling device, the left side of the cooling device is cooled down by the cooling device, the cooling device is cooled down by the cooling device, and the cooling device is cooled down by the cooling device at the left side of the cooling device, and the cooling device is cooled down by the cooling device, and the cooling device is cooled by the cooling device, after cooling, a signal is sent to the PLC controller, the PLC controller controls the alarm to alarm, and the worker is reminded to take out the material receiving box.
Compared with the prior art, the invention has the beneficial effects that:
The utility model provides a processing ladder is quenching device for brill, quenching furnace, cooling device and PLC controller, all be equipped with conveying mechanism between quenching furnace and the cooling device, can be through conveying mechanism with arrange the collection box of full ladder brill and carry automatically to quenching furnace and cooling device before, need not manual transport, manpower resources has been practiced thrift, labour saving and time saving, quenching furnace and cooling device both sides all are equipped with electric telescopic door, quenching furnace feed end top is equipped with advancing mechanism, cooling device feed end top is equipped with the arm, need not manual transport to receive the magazine in quenching furnace and the cooling device, can carry the magazine to quenching furnace and the cooling device in automatically, convenient and fast, electric telescopic door bottom is equipped with the infrared sensor of response material receiving box, can in time respond to the arrival of material receiving box, prevent material receiving box to hit on electric telescopic door, the cooling device upper end is equipped with the alarm, remind the staff in time to take out material receiving box after quenching, this device degree of automation is high, need not manpower constantly follow-up in time, only need take out material receiving box in time after finishing, can realize controlling a plurality of quenching device has improved a plurality of quenching production efficiency.
Drawings
Fig. 1 is a front view of the present invention.
FIG. 2 is a schematic diagram of the workflow of the present invention.
Fig. 3 is a left side view of the quenching furnace.
Fig. 4 is a left side view of the cooling device.
Fig. 5 is a top view of the pusher block.
Wherein, 1 is the quenching furnace, 11 is the quenching furnace shell, 12 is high-frequency heating device, 13 is the heating platform, 2 is cooling device, 3 is the PLC controller, 4 is the alarm, 5 is conveying mechanism, 6 is the receipts magazine, 7 is the electric expansion gate, 71 is infrared sensor, 8 is advancing mechanism, 81 is elevator motor, 82 is advancing motor, 83 is the propulsion piece, 9 is the arm, 91 is the fixing base, 92 is the clamping jaw.
Detailed Description
As shown in fig. 1-5, a quenching device for machining step drills comprises a quenching furnace 1, a cooling device 2 and a PLC (programmable logic controller) 3, wherein the cooling device is arranged on the right side of the quenching furnace 1, an alarm 4 is arranged above the cooling device 2, the quenching furnace 1 comprises a quenching furnace shell 11, a high-frequency heating device 12 and a heating table 13, the PLC 3 is arranged on the quenching furnace shell 11, the heating table 13 is arranged in the quenching furnace shell 11 and is arranged at the bottom of the quenching furnace 1, the high-frequency heating device 12 is arranged in the heating table 13, and the quenching device is characterized in that a conveying mechanism 5 is arranged between the left side of the quenching furnace 1 and the cooling device 2, a receiving box 6 with the step drills discharged is arranged on the conveying mechanism 5, the conveying mechanism 5 is used for conveying the receiving box 6 to the vicinity of feeding ends of the quenching furnace 1 and the cooling device 2, and the driving end of the conveying mechanism 5, the high-frequency heating device 12, the cooling device 2 and the alarm 4 are connected with the PLC 3.
Further, electric telescopic doors 7 are arranged on two side surfaces of the quenching furnace shell 11 and the cooling device 2, the electric telescopic doors 7 on the left side are feeding ends of the quenching furnace 1 and the cooling device 2, the electric telescopic doors 7 on the right side are discharging ends of the quenching furnace 1 and the cooling device 2, the output ends of the conveying mechanism 5 are aligned with the electric telescopic doors 7 on the left side, the conveying surface of the conveying mechanism 5 and the lower bottom surface of the electric telescopic doors 7 are on the same horizontal line, and the electric telescopic doors 7 are connected with the PLC 3.
Further, an infrared sensor 71 for sensing the receiving box 6 is arranged at the bottom of the electric telescopic door 7 at the left side, the height of the infrared sensor 71 is slightly higher than that of the conveying surface of the conveying mechanism 5, and the infrared sensor 71 is connected with the PLC 3.
Further, the table top of the heating table 13 is flush with the conveying surface of the conveying mechanism (5).
Further, the left side of the feeding end of the quenching furnace 1 is provided with a pushing mechanism 8, the pushing mechanism 8 comprises a lifting motor 81, a pushing motor 82 and a pushing block 83, the lifting motor 81 is arranged above the conveying mechanism 5, the pushing motor 82 is arranged right below the lifting motor 81, the upper end of the pushing motor 82 is connected with the output end of the lifting motor 81, the pushing block 83 is concave, the concave surface of the pushing block 83 faces the direction of the feeding inlet of the quenching furnace 1, and the lifting motor 81 and the pushing motor 82 are connected with the PLC 3.
Further, the width of the concave portion of the pushing block 83 is greater than the width of the receiving box 6 and less than or equal to the width of the conveying surface of the conveying mechanism 5.
Further, a mechanical arm 9 is arranged between the quenching furnace 1 and the cooling device 2, the mechanical arm 9 is arranged above the conveying mechanism 5 through a fixing seat 91, the head end of the mechanical arm 9 is rotatably connected with the fixing seat 91, a clamping claw 92 for clamping the step drill is arranged on the mechanical arm 9, the clamping claw 92 is rotatably arranged at the tail end of the mechanical arm 9, the mechanical arm 9 controls the rotation, clamping and loosening of the clamping claw 92, and the mechanical arm 9 is connected with the PLC 3.
Further, the material receiving box 6 is made of high-temperature resistant materials.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (1)
1. The utility model provides a processing quenching device for ladder drill, includes quenching furnace (1), cooling device (2) and PLC controller (3), the cooling sets up in quenching furnace (1) right side, be equipped with alarm (4) above cooling device (2), quenching furnace (1) are including quenching furnace casing (11), high frequency heating device (12) and heating platform (13), PLC controller (3) set up on quenching furnace casing (11), heating platform (13) are installed in quenching furnace casing (11) and are installed in quenching furnace (1) bottom, high frequency heating device (12) set up in heating platform (13), characterized in that, all be equipped with conveying mechanism (5) between quenching furnace (1) left side, quenching furnace (1) and cooling device (2), conveying mechanism (5) are last to put receive magazine (6) of arranging the ladder drill, conveying mechanism (5) are used for carrying receive magazine (6) to quenching furnace (1) and cooling device (2) feed end nearby, conveying mechanism (12), high frequency heating device (4) and PLC controller (3) are all connected to the conveying mechanism (4);
The quenching furnace comprises a quenching furnace shell (11) and a cooling device (2), wherein electric telescopic doors (7) are arranged on two side surfaces of the quenching furnace shell (11) and the cooling device (2), the electric telescopic doors (7) on the left side are the feeding ends of the quenching furnace (1) and the cooling device (2), the electric telescopic doors (7) on the right side are the discharging ends of the quenching furnace (1) and the cooling device (2), the output end of a conveying mechanism (5) is aligned with the electric telescopic doors (7) on the left side, the conveying surface of the conveying mechanism (5) is flush with the lower bottom surface of the electric telescopic doors (7), and the electric telescopic doors (7) are connected with a PLC (programmable logic controller) 3;
The bottom of the electric telescopic door (7) at the left side is provided with an infrared sensor (71) for sensing the material receiving box (6), the height of the infrared sensor (71) is slightly higher than the conveying surface of the conveying mechanism (5), and the infrared sensor (71) is connected with the PLC (3);
the table top of the heating table (13) is flush with the conveying surface of the conveying mechanism (5);
The left side of the feeding end of the quenching furnace (1) is provided with a pushing mechanism (8), the pushing mechanism (8) comprises a lifting motor (81), a pushing motor (82) and a pushing block (83), the lifting motor (81) is arranged above the conveying mechanism (5), the pushing motor (82) is arranged right below the lifting motor (81), the upper end of the pushing motor (82) is connected with the output end of the lifting motor (81), the pushing block (83) is concave, the concave surface of the pushing block (83) faces the feeding hole direction of the quenching furnace (1), and the lifting motor (81) and the pushing motor (82) are connected with a PLC (3);
The width of the concave part of the pushing block (83) is larger than the width of the material receiving box (6) and smaller than or equal to the width of the conveying surface of the conveying mechanism (5);
A mechanical arm (9) is arranged between the quenching furnace (1) and the cooling device (2), the mechanical arm (9) is arranged above the conveying mechanism (5) through a fixed seat (91), the head end of the mechanical arm (9) is rotatably connected with the fixed seat (91), a clamping claw (92) for clamping the step drill is arranged on the mechanical arm (9), the clamping claw (92) is rotatably arranged at the tail end of the mechanical arm (9), the mechanical arm (9) controls the rotation, clamping and loosening of the clamping claw (92), and the mechanical arm (9) is connected with the PLC (3);
the material receiving box (6) is made of high-temperature resistant materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561514.2A CN108486350B (en) | 2018-06-04 | 2018-06-04 | Quenching device for machining step drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561514.2A CN108486350B (en) | 2018-06-04 | 2018-06-04 | Quenching device for machining step drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108486350A CN108486350A (en) | 2018-09-04 |
| CN108486350B true CN108486350B (en) | 2024-04-19 |
Family
ID=63341926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810561514.2A Active CN108486350B (en) | 2018-06-04 | 2018-06-04 | Quenching device for machining step drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108486350B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109264295A (en) * | 2018-10-29 | 2019-01-25 | 镇江科胜电子科技有限公司 | Conveying device is used in a kind of production of connector pin |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441698A (en) * | 1981-03-21 | 1984-04-10 | Ferdinand Limque | Furnace for the heat treatment of drills |
| JP2007131904A (en) * | 2005-11-09 | 2007-05-31 | Koyo Thermo System Kk | Quenching apparatus |
| CN201217672Y (en) * | 2008-06-06 | 2009-04-08 | 约克夏(浙江)工具有限公司 | Thermal treatment electric furnace set |
| CN202116596U (en) * | 2011-05-03 | 2012-01-18 | 上海北特科技股份有限公司 | Plate hard medium quenching and cooling system |
| CN204661785U (en) * | 2015-04-28 | 2015-09-23 | 苏州大学 | Drill bit equipment for Heating Processing |
| CN105441647A (en) * | 2014-09-29 | 2016-03-30 | 苏州国琳机械制造有限公司 | Continuous mesh belt-type quenching furnace production line with oil fume burner |
| CN106086336A (en) * | 2016-07-28 | 2016-11-09 | 耐世特凌云驱动***（芜湖）有限公司 | The quenching unit of axostylus axostyle |
| CN107245553A (en) * | 2017-05-06 | 2017-10-13 | 东台丰华炉业有限公司 | A kind of full-automatic backfire product line and its operating process |
| CN208234950U (en) * | 2018-06-04 | 2018-12-14 | 江苏甬润工具有限公司 | A kind of processing step drill quenching unit |
-
2018
- 2018-06-04 CN CN201810561514.2A patent/CN108486350B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441698A (en) * | 1981-03-21 | 1984-04-10 | Ferdinand Limque | Furnace for the heat treatment of drills |
| JP2007131904A (en) * | 2005-11-09 | 2007-05-31 | Koyo Thermo System Kk | Quenching apparatus |
| CN201217672Y (en) * | 2008-06-06 | 2009-04-08 | 约克夏(浙江)工具有限公司 | Thermal treatment electric furnace set |
| CN202116596U (en) * | 2011-05-03 | 2012-01-18 | 上海北特科技股份有限公司 | Plate hard medium quenching and cooling system |
| CN105441647A (en) * | 2014-09-29 | 2016-03-30 | 苏州国琳机械制造有限公司 | Continuous mesh belt-type quenching furnace production line with oil fume burner |
| CN204661785U (en) * | 2015-04-28 | 2015-09-23 | 苏州大学 | Drill bit equipment for Heating Processing |
| CN106086336A (en) * | 2016-07-28 | 2016-11-09 | 耐世特凌云驱动***（芜湖）有限公司 | The quenching unit of axostylus axostyle |
| CN107245553A (en) * | 2017-05-06 | 2017-10-13 | 东台丰华炉业有限公司 | A kind of full-automatic backfire product line and its operating process |
| CN208234950U (en) * | 2018-06-04 | 2018-12-14 | 江苏甬润工具有限公司 | A kind of processing step drill quenching unit |
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| Publication number | Publication date |
|---|---|
| CN108486350A (en) | 2018-09-04 |
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