CN109458373B - Fluid control solenoid valve structure - Google Patents
Fluid control solenoid valve structure Download PDFInfo
- Publication number
- CN109458373B CN109458373B CN201811633619.0A CN201811633619A CN109458373B CN 109458373 B CN109458373 B CN 109458373B CN 201811633619 A CN201811633619 A CN 201811633619A CN 109458373 B CN109458373 B CN 109458373B
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- China
- Prior art keywords
- exhaust
- magnetic core
- filling block
- pole shoe
- valve
- 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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- 239000012530 fluid Substances 0.000 title claims abstract description 20
- 230000005291 magnetic effect Effects 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000003344 environmental pollutant Substances 0.000 abstract description 8
- 231100000719 pollutant Toxicity 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 7
- 239000002923 metal particle Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 238000012856 packing Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention provides a fluid control electromagnetic valve structure which comprises a pole shoe, a magnetic core shaft, a magnetic core, a filling block and a valve sleeve, wherein one end of the magnetic core shaft is fixedly connected with the magnetic core, the other end of the magnetic core shaft and the pole shoe form a clearance fit structure, an exhaust groove is formed in the filling block, and an exhaust hole is formed in the valve sleeve; the magnetic core and the magnetic core shaft form a connecting hole, a sealing structure is formed between the filling block and the pole shoe, an exhaust channel is formed between the valve sleeve and the filling block through an exhaust groove, and the exhaust channel is respectively communicated with the connecting hole and the exhaust hole. The invention does not need to sacrifice the outer circumference structural space of the solenoid, greatly prolongs the exhaust passage of the solenoid valve, can well prevent metal particle pollutants in hydraulic fluid from entering the inside of the solenoid assembly, can effectively avoid the pollutant exchange between the inside and the outside of the solenoid valve, ensures the working reliability of the solenoid valve, and has the outstanding advantages of simple processing, low processing cost and the like.
Description
Technical Field
The invention relates to the field of electromagnetic valve structural design, in particular to a fluid control electromagnetic valve structure applied to an automobile power assembly device.
Background
Automotive powertrains typically include an engine and an automatic transmission, and control of the oil pump in the engine cooling and lubrication system is commonly controlled by solenoid valves, through which flow control of the torque converter, clutches, and cooling and lubrication system is also regulated during operation of the automatic transmission.
When the solenoid valve is in operation, it is typically immersed partially or completely in oil. During operation of the vehicle, metallic particulate contaminants are carried in the hydraulic fluid due to wear of transmission parts such as gears, shafts and bearings. These metal particle contaminants may be deposited in the solenoid valve due to the adsorption of the electromagnetic field, thereby affecting the operational reliability of the solenoid valve and causing the movement of moving parts such as the armature member to be stuck. The current electromagnetic valve structural design sacrifices the structural space of the outer circumference of the solenoid, and reduces the tightness. In order to ensure the sealing performance of the valve sleeve end face and the ferromagnetic gasket, the machining precision of the two sealing surfaces needs to be improved or a sealing element is added between the two sealing surfaces to assist sealing, which inevitably leads to the increase of machining cost in actual mass production.
Disclosure of Invention
The invention aims to solve the technical problems that: aiming at the problems in the prior art, the fluid control electromagnetic valve structure is provided, so that metal particle pollutants in hydraulic fluid are prevented from entering the electromagnetic assembly, and pollutant exchange between the inside and the outside of the electromagnetic valve is avoided.
The technical problems to be solved by the invention are realized by adopting the following technical scheme: the fluid control electromagnetic valve structure comprises a pole shoe, a magnetic core shaft, a magnetic core, a filling block and a valve sleeve, wherein one end of the magnetic core shaft is fixedly connected with the magnetic core, the other end of the magnetic core shaft and the pole shoe form a clearance fit structure, an exhaust groove is formed in the filling block, and an exhaust hole is formed in the valve sleeve; the magnetic core and the magnetic core shaft form a connecting hole, a sealing structure is formed between the filling block and the pole shoe, an exhaust channel is formed between the valve sleeve and the filling block through an exhaust groove, and the exhaust channel is respectively communicated with the connecting hole and the exhaust hole.
Preferably, the filling block is provided with a filling block notch, and the filling block notch is communicated with the exhaust groove.
Preferably, pole shoe end hole gaps are formed among the pole shoe, the magnetic core shaft and the valve core, the connecting holes, the pole shoe end hole gaps and the filling block inner cavities are communicated with each other and jointly form a variable volume cavity, and the variable volume cavity is communicated with the exhaust channel through the filling block gap.
Preferably, the overall volume of the exhaust passage is 1.5 times or more the exhaust volume of the variable-volume chamber.
Preferably, the filling block is provided with an annular groove, and the annular groove is communicated with the exhaust groove.
Preferably, the exhaust groove is a spiral groove, a stepped annular groove or a wave-shaped groove formed by combining the spiral groove and the annular groove.
Preferably, the cross section of the exhaust groove is in a rounded rectangular structure or in a circular arc structure.
Preferably, the cross-sectional shape of the vent hole is a square structure or a circular structure.
Preferably, the magnetic core shaft adopts a stepped structure shaft, wherein a fixed connection structure is formed between the relatively larger end and the magnetic core, and a clearance fit structure is formed between the relatively smaller end and the pole shoe.
Compared with the prior art, the invention has the beneficial effects that: the sealing reliability of the electromagnetic valve is ensured, and meanwhile, the exhaust channel of the electromagnetic valve is greatly prolonged, so that metal particle pollutants in hydraulic fluid can be well prevented from entering the electromagnetic assembly in the working process of the electromagnetic valve, and pollutant exchange between the inside and the outside of the electromagnetic valve can be effectively avoided, thereby ensuring the working reliability of the electromagnetic valve, having simple processing and low processing cost, and not sacrificing the outer circumferential structural space of the electromagnetic valve.
Drawings
Fig. 1 is a cross-sectional view of a fluid control solenoid valve structure according to the present invention.
Fig. 2 is a schematic structural view of the valve sleeve of fig. 1.
Fig. 3 is a schematic structural view of the filling block in fig. 1.
Item label name in figure: 1-first sealing ring, 2-oil inlet filter screen, 3-second sealing ring, 4-return spring, 5-spring seat, 6-front yoke bush, 7-pole shoe, 8-magnetic core shaft, 9-magnetic core, 10-back yoke bush, 11-valve seat, 12-buckle, 13-solenoid insert, 14-solenoid wire lug, 15-valve shell, 16-electromagnetic solenoid, 17-connecting hole, 18-pole shoe end hole gap, 19-filling block, 20-filling block inner cavity, 21-valve core, 22-guide sleeve, 23-oil inlet hole, 24-valve sleeve, 25-end filter screen, 26-oil outlet, 27-exhaust hole, 150-valve housing boss, 190-filling block outer wall surface, 191-filling block notch, 192-exhaust groove, 193-annular groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The structure of the fluid control electromagnetic valve shown in fig. 1 comprises a valve sleeve component and an electromagnetic component, wherein the valve sleeve component and the electromagnetic component are riveted and fixed together in a closing-in mode through a front yoke bush 6. The valve sleeve assembly mainly comprises a valve core 21 and a valve sleeve 24 which can be formed by metal processing or plastic polymer, wherein the valve sleeve 24 is of a hollow cavity structure, an oil outlet 26 is formed at one end of the valve sleeve, a filling block 19 is arranged in an inner cavity at the other end of the valve sleeve, an end filter screen 25 is arranged at the oil outlet 26, and the end filter screen 25 is fixedly connected with the valve sleeve 24. A guide sleeve 22 is fixedly arranged in the hollow inner cavity of the valve sleeve 24, the valve core 21 penetrates through the guide sleeve 22, and the valve core 21 can slide linearly relative to the guide sleeve 22. The valve sleeve 24 is provided with an oil inlet hole 23, the valve sleeves 24 on two opposite sides of the oil inlet hole 23 are respectively provided with an annular clamping groove, and the annular clamping grooves are respectively provided with a first sealing ring 1 and a second sealing ring 3; an oil inlet filter screen 2 is further arranged at the inlet of the oil inlet hole 23, and the oil inlet filter screen 2 covers the oil inlet hole 23 and is fixedly connected with a valve sleeve 24.
The electromagnetic assembly mainly comprises a valve seat 11, a valve shell 15, an electromagnetic solenoid 16, a back yoke bush 10, a pole shoe 7, a magnetic core shaft 8, a magnetic core 9 and a plug assembly, wherein the plug assembly comprises a buckle 12, a solenoid pipe inserting piece 13 and a solenoid wire lug 14, and the solenoid pipe inserting piece 13 is connected with the solenoid wire lug 14 through a welding process or a bending and compacting process and is wrapped and protected by the valve seat 11 and the buckle 12. The large end plane of the valve sleeve 24 is tightly attached to one end surface of the front yoke bush 6 and is fixedly connected with the valve housing 15 in a closing-in press-fitting manner. The front yoke bush 6, the pole shoe 7 and the back yoke bush 10 are hollow cavity structures, a magnetic core 9 is arranged in a hollow cavity of the pole shoe 7, the magnetic core 9 can slide linearly relative to the pole shoe 7, and the opposite ends of the pole shoe 7 form a fixed connection structure with the front yoke bush 6 and the back yoke bush 10 through a riveting process or a welding process or an interference press-fitting process respectively.
The valve housing 15 is magnetically connected with the front yoke bush 6 and the rear yoke bush 10, and the front end face and the rear end face of the electromagnetic solenoid 16 are respectively attached to the end faces of the front yoke bush 6 and the rear yoke bush 10. The valve seat 11 is fixedly connected with the valve shell 15, and the buckle 12 and the valve seat 11 form a fixed connection structure through a clamping mechanism. The magnetic core shaft 8 is preferably a stepped shaft, wherein a fixed connection structure is formed between the relatively larger end and the magnetic core 9 through a riveting process, a welding process or an interference press-fitting process, and a clearance fit structure is formed between the relatively smaller end and the pole shoe 7 so as to prevent the magnetic core 9 from being magnetically attracted with the pole shoe 7.
As shown in fig. 3, the filling block 19 has a hollow cavity structure, a filling block notch 191 is formed in the filling block 19, an exhaust groove 192 and an annular groove 193 are formed in an outer wall surface 190 of the filling block on the filling block 19, and the filling block notch 191 and the exhaust groove 192 are mutually communicated. The venting grooves 192 may be spiral grooves, stepped ring grooves, or wave grooves formed by combining spiral grooves with ring grooves. The cross-sectional shape of the vent grooves 192 may be rounded rectangular, or circular arc, or any other shape that facilitates the passage of fluid. The valve core 21 is fixedly connected with the spring seat 5, a return spring 4 is arranged between the spring seat 5 and the guide sleeve 22, and the return spring 4 and the spring seat 5 are both positioned in the inner cavity of the filling block 19.
The packing block 19 and the valve sleeve 24 are fixedly connected through an interference press-fitting process or a welding process, a sealing structure is formed between one end of the packing block 19 and one end of the pole shoe 7, and an exhaust channel is formed between the inner hole wall surface of the valve sleeve 24 and the outer diameter wall surface of the packing block 19 through an exhaust groove 192. The pole shoe 7, the valve core 21 and the magnetic core shaft 8 form a pole shoe end hole gap 18, a connecting hole 17 is formed between the magnetic core 9 and the magnetic core shaft 8, and the valve sleeve 24 is provided with an exhaust hole 27 as shown in fig. 2. The cross-sectional shape of the vent 27 may be square, circular, or irregular. The connecting hole 17, the pole shoe end hole gap 18 and the filling block inner cavity 20 are mutually communicated and jointly form a variable volume cavity with variable volume, the variable volume cavity is communicated with the annular groove 193 through the filling block notch 191 and the exhaust groove 192, the annular groove 193 is communicated with the exhaust hole 27, and the exhaust hole 27 is communicated with the external atmosphere, so that the exhaust channel can be communicated with the external atmosphere through the exhaust hole 27.
When the magnetic core 9 slides to the far right end to contact with the valve housing boss 150 on the valve housing 15, the volume of the variable volume cavity is V1, and when the electromagnetic solenoid 16 is energized, the magnetic core 9 moves to the left end limit position under the action of electromagnetic force, and at this time, the volume of the variable volume cavity is V2, then Δv= |v1-v2|, and Δv is referred to as the exhaust volume of the electromagnetic valve. Typically, the overall volume of the exhaust passage should be at least 1.5 times or more the above mentioned exhaust volume Δv.
It should be noted that the vent passage may be formed by machining or etching on the packing block 19 or the valve sleeve 24 alone, or may be injection molded, extruded, or cast, or may be formed by forming partial features on the packing block 19 and the valve sleeve 24 and finally combining them to form the final vent passage, and the vent passage is in communication with the annular groove 193, and the annular groove 193 is not in communication with the vent hole 27 in the circumferential direction.
The invention has simple processing and low processing cost, does not need to sacrifice the outer circumference structural space of the solenoid, ensures the sealing reliability of the solenoid valve, greatly prolongs the exhaust passage of the solenoid valve, and effectively avoids the pollutant exchange between the inside and the outside of the solenoid valve. Therefore, in the working process of the electromagnetic valve, metal particle pollutants in the hydraulic fluid can be well prevented from entering the electromagnetic assembly, and the working reliability of the electromagnetic valve is ensured.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The utility model provides a fluid control solenoid valve structure, includes pole shoe (7), magnetic core axle (8), magnetic core (9) and valve pocket (24), the one end and magnetic core (9) fixed connection of magnetic core axle (8), the other end forms clearance fit structure with pole shoe (7), its characterized in that: the valve sleeve also comprises a filling block (19), wherein an exhaust groove (192) is formed in the filling block (19), and an exhaust hole (27) is formed in the valve sleeve (24); a connecting hole (17) is formed between the magnetic core (9) and the magnetic core shaft (8), a sealing structure is formed between the filling block (19) and the pole shoe (7), an exhaust channel is formed between the valve sleeve (24) and the filling block (19) through an exhaust groove (192), and the exhaust channel is respectively communicated with the connecting hole (17) and the exhaust hole (27);
filling block gaps (191) are formed in the filling blocks (19), and the filling block gaps (191) are communicated with the exhaust grooves (192); an annular groove (193) is formed on the filling block (19), the annular groove (193) is communicated with an exhaust groove (192),
the pole shoe (7), the magnetic core shaft (8) and the valve core (21) form a pole shoe end hole gap (18), the connecting hole (17), the pole shoe end hole gap (18) and the inner cavity of the filling block (19) are mutually communicated and jointly form a variable volume cavity, and the variable volume cavity is communicated with the exhaust channel through the filling block gap (191).
2. A fluid control solenoid valve structure according to claim 1, wherein: the whole volume of the exhaust channel is more than 1.5 times of the exhaust volume of the variable-volume cavity.
3. A fluid control solenoid valve structure according to any one of claims 1-2, wherein: the exhaust groove (192) is a spiral groove, a stepped annular groove or a wave-shaped groove formed by combining the spiral groove and the annular groove.
4. A fluid control solenoid valve structure according to any one of claims 1-2, wherein: the cross section of the exhaust groove (192) is in a round-corner rectangular structure or in a circular arc structure.
5. A fluid control solenoid valve structure according to any one of claims 1-2, wherein: the cross section of the exhaust hole (27) is square or circular.
6. A fluid control solenoid valve structure according to any one of claims 1-2, wherein: the magnetic core shaft (8) adopts a stepped structure shaft, wherein a fixed connection structure is formed between the relatively larger end and the magnetic core (9), and a clearance fit structure is formed between the relatively smaller end and the pole shoe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811633619.0A CN109458373B (en) | 2018-12-29 | 2018-12-29 | Fluid control solenoid valve structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811633619.0A CN109458373B (en) | 2018-12-29 | 2018-12-29 | Fluid control solenoid valve structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109458373A CN109458373A (en) | 2019-03-12 |
| CN109458373B true CN109458373B (en) | 2024-04-12 |
Family
ID=65615614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811633619.0A Active CN109458373B (en) | 2018-12-29 | 2018-12-29 | Fluid control solenoid valve structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109458373B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992013221A1 (en) * | 1991-01-16 | 1992-08-06 | Ab Mecman | A protective device for an exhaust channel of an electrically controlled pneumatic valve |
| CN1271821A (en) * | 1999-04-27 | 2000-11-01 | 速睦喜股份有限公司 | Double force drived leading type electromagnetic valve |
| KR200311556Y1 (en) * | 2003-01-17 | 2003-05-09 | 주식회사 이스텍 | Solenoid valve |
| CN1659396A (en) * | 2002-06-06 | 2005-08-24 | 株式会社小金井 | Electromagnetic valve |
| CN103195969A (en) * | 2013-03-26 | 2013-07-10 | 杰锋汽车动力***股份有限公司 | Proportional control hydraulic valve structure |
| CN104454061A (en) * | 2014-11-20 | 2015-03-25 | 绵阳富临精工机械股份有限公司 | Engine oil control valve with guiding structure |
| CN105822805A (en) * | 2016-05-31 | 2016-08-03 | 绵阳富临精工机械股份有限公司 | Gasket type electromagnetic valve sleeve installation structure |
| CN207470892U (en) * | 2017-10-30 | 2018-06-08 | 新乡北方液压传动机械有限公司 | Electromagnetic valve of gas circuit and electromagnetic valve of gas circuit valve base |
| CN209444643U (en) * | 2018-12-29 | 2019-09-27 | 绵阳富临精工机械股份有限公司 | A kind of fluid control electromagnetic valve structure |
-
2018
- 2018-12-29 CN CN201811633619.0A patent/CN109458373B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992013221A1 (en) * | 1991-01-16 | 1992-08-06 | Ab Mecman | A protective device for an exhaust channel of an electrically controlled pneumatic valve |
| CN1271821A (en) * | 1999-04-27 | 2000-11-01 | 速睦喜股份有限公司 | Double force drived leading type electromagnetic valve |
| CN1659396A (en) * | 2002-06-06 | 2005-08-24 | 株式会社小金井 | Electromagnetic valve |
| KR200311556Y1 (en) * | 2003-01-17 | 2003-05-09 | 주식회사 이스텍 | Solenoid valve |
| CN103195969A (en) * | 2013-03-26 | 2013-07-10 | 杰锋汽车动力***股份有限公司 | Proportional control hydraulic valve structure |
| CN104454061A (en) * | 2014-11-20 | 2015-03-25 | 绵阳富临精工机械股份有限公司 | Engine oil control valve with guiding structure |
| CN105822805A (en) * | 2016-05-31 | 2016-08-03 | 绵阳富临精工机械股份有限公司 | Gasket type electromagnetic valve sleeve installation structure |
| CN207470892U (en) * | 2017-10-30 | 2018-06-08 | 新乡北方液压传动机械有限公司 | Electromagnetic valve of gas circuit and electromagnetic valve of gas circuit valve base |
| CN209444643U (en) * | 2018-12-29 | 2019-09-27 | 绵阳富临精工机械股份有限公司 | A kind of fluid control electromagnetic valve structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109458373A (en) | 2019-03-12 |
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