CN109322629B - Vertical pumping unit rope hanger - Google Patents
Vertical pumping unit rope hanger Download PDFInfo
- Publication number
- CN109322629B CN109322629B CN201811499851.XA CN201811499851A CN109322629B CN 109322629 B CN109322629 B CN 109322629B CN 201811499851 A CN201811499851 A CN 201811499851A CN 109322629 B CN109322629 B CN 109322629B
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- China
- Prior art keywords
- rod
- balance adjusting
- polish rod
- polish
- sucker
- 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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- 238000005086 pumping Methods 0.000 title claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 210000003734 kidney Anatomy 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 1
- 239000003129 oil well Substances 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
A vertical pumping unit rope hanger consists of a steel wire rope, a balance adjusting plate, a balance adjusting stud, a solar cell panel, a force transducer, a controller, a pumping rod polished rod supporting plate, a horizontal bubble ruler and a pumping rod polished rod, wherein the balance adjusting stud is respectively arranged at two ends of the balance adjusting plate, and the steel wire rope penetrates through the balance adjusting stud and is clamped at the lower end by a half joint. The sucker rod polish rod support plate is provided with a controller, a solar cell panel and a horizontal bubble ruler, and the sucker rod polish rod is perpendicular to the upper surface of the sucker rod polish rod support plate through a step shaft. And a force transducer is connected between the balance adjusting plate and the sucker rod polished rod supporting plate, so that the tensile force born by the polished rod can be measured in real time. When the pumping rod polish rod is not vertical in the left-right direction, the balance adjusting stud is rotated, the pumping rod polish rod support plate is adjusted to be horizontal, the polish rod is perpendicular to the wellhead in the left-right direction, and the problem that the eccentric wear of the pumping rod is not vertical to the oil well is solved.
Description
Technical Field
The invention relates to a vertical pumping unit rope hanger, belonging to the new field of electromechanical integration application.
Background
The sucker rod is an important component in sucker rod pumping equipment, and its upper end is connected with the polish rod and its lower end is connected with the oil-well pump, so that it is an important component for transferring power and bearing load between oil-well pump and oil-well pump. In the pumping system, the sucker rod string is formed by combining a certain number of sucker rods and couplings, the upper end of the sucker rod string is connected with a rope hanger of the pumping unit, and the lower end of the sucker rod string is connected with a plunger of the oil pump. The pumping unit lifting mechanism pulls the sucker rod column through the rope hanger to drive the sucker rod plunger to reciprocate up and down together so as to pump underground crude oil.
When the sucker rod reciprocates in the shaft, if the axes of the sucker rod polish rod and the shaft are not coincident, the sucker rod is caused to move in the shaft with increased friction under the condition of not reciprocating in the vertical direction, the load of the pumping unit is increased, a large amount of energy is consumed, even the sucker rod is blocked in movement, the stroke of the sucker rod is delayed from the suspension point of the pumping unit to generate impact load, the normal production of an oil well is affected, and when the sucker rod is serious, the sucker rod is worn off in a long time and even broken. After well repair operation, the pumping unit is required to be readjusted to be perpendicular to a wellhead due to the position adjustment of the pumping unit, so that the pumping unit is not vertical due to slight deviation in the centering process, and the position of the pumping unit is inconvenient to readjust.
Disclosure of Invention
In order to solve the problems, the invention provides the vertical pumping unit rope hanger which has the advantages of simple structure, convenient adjustment, capability of quickly adjusting the left and right direction position and inclination of the pumping rod polish rod, capability of monitoring the inclination state of the pumping rod, load change and pumping unit power in real time, solar power supply and environmental protection and energy saving.
The invention adopts the technical proposal for solving the problems that: a vertical pumping unit rope hanger consists of a balance adjusting plate, a balance adjusting stud, a solar cell panel, a force transducer, a controller, a sucker rod supporting plate, a lock nut and a horizontal bubble ruler, wherein the balance adjusting studs with middle through holes are respectively arranged at two ends of the balance adjusting plate, a rope head taper sleeve of a steel wire rope for pulling a sucker rod polished rod to reciprocate is subjected to lead filling treatment, the steel wire rope passes through the middle through holes of the balance adjusting studs after being clamped and fixed firmly through a half joint and is clamped at the lower end of the steel wire rope, and external threads of the balance adjusting studs are matched with threaded holes on the balance adjusting plate. The balance adjusting plate and the center of the sucker rod polish rod supporting plate are respectively provided with a waist groove through hole with the same size, the axis of the waist groove in the length direction is parallel to the long side of the sucker rod polish rod supporting plate, the sucker rod polish rod penetrates through the waist groove through hole, the waist groove through width is slightly larger than the diameter of the sucker rod polish rod, and the sucker rod polish rod can transversely move within the length range of the waist groove. The sucker rod polished rod passes the waist slot through-hole in sucker rod polished rod backup pad central authorities, and the step axle card that adds thick through a section on the sucker rod polished rod upper end is at sucker rod polished rod backup pad upper surface to through lock nut on the sucker rod polished rod and step axle cooperation, the relative position between locking fixed sucker rod polished rod and the sucker rod polished rod backup pad, and guarantee that the sucker rod is strictly perpendicular to the sucker rod polished rod backup pad. The upper surface of the sucker rod polish rod supporting plate is provided with a controller, a solar cell panel for supplying power to the device and a horizontal bubble ruler for observing whether the sucker rod polish rod supporting plate is horizontal. A group of force transducers are connected between the balance adjusting plate and the polished rod supporting plate of the sucker rod through bolts, the force transducers at the left end and the right end are symmetrically distributed, and the tension values at the force transducers can be measured independently in real time. When the sucker rod is vertical, the tension values measured by the force transducers at the two ends are equal, and the sum of the tension values is the tension force of the sucker rod polish rod; when the pumping rod is inclined in the left-right direction and eccentric wear occurs, the tension values measured by the force transducers at the left end and the right end are unequal, and the position and the inclination angle of the pumping rod are required to be adjusted at the moment. Therefore, the working state of the sucker rod can be monitored in real time through the measured values of the group of force transducers, and whether the sucker rod is inclined in the left-right direction or the sucker rod is eccentrically worn or not can be judged, and the sucker rod is timely adjusted.
By adopting the technical scheme, when the position and the vertical condition of the left and right directions of the polish rod of the sucker rod are required to be adjusted, the lock nut is unscrewed, and the position of the left and right directions of the polish rod of the sucker rod is transversely finely adjusted within the range of the waist slot of the polish rod supporting plate. Simultaneously, the balance adjusting stud is rotated, the length of the steel wire rope penetrating through the balance adjusting plate is changed, the sucker rod polished rod supporting plate is adjusted to be horizontal through the cooperation of the balance adjusting studs at two ends, and then the locking nut is screwed to fix the position of the sucker rod polished rod, so that the sucker rod polished rod is vertical to a wellhead in the left-right direction, and the problem that the eccentric wear of the sucker rod is not vertical to the cooperation of an oil well is effectively solved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
FIG. 2 is a front view of the whole structure of the present invention
Fig. 3 is a cross-sectional view of the mechanism connecting portion of the present invention.
Fig. 4 is a partial cross-sectional view of the balance adjustment stud of the present invention.
In the figure: 1. a wire rope; 2. a balance adjustment plate; 3. balance adjusting studs; 4. a solar cell panel; 5. a load cell; 6. a half joint; 7. a controller; 8. a polished rod support plate of the sucker rod; 9. a horizontal bubble ruler; 10. a lock nut; 11. sucker rod polished rod.
Detailed Description
The structure and embodiments of the present invention are further illustrated in the following drawings, and as shown in fig. 1 and 2, the rope hanger of a vertical pumping unit includes: the device comprises a steel wire rope 1, a balance adjusting plate 2, a balance adjusting stud 3, a solar cell panel 4, a load cell 5, a half joint 6, a controller 7, a sucker rod polished rod supporting plate 8, a horizontal bubble ruler 9, a locking nut 10 and a sucker rod polished rod 11.
As shown in fig. 3 and 4, the rope end of the steel wire rope 1 is subjected to taper sleeve lead filling treatment, and the upper end of the rope end is clamped and fixed firmly by a half joint 6. A waist groove through hole is formed in the center of the balance adjusting plate 2, the axis of the waist groove in the length direction is parallel to the long side of the balance adjusting plate 2, the upper end of the pumping rod polished rod 11 penetrates through the waist groove through hole, the width of the waist groove through hole is slightly larger than the diameter of the upper end of the pumping rod polished rod 11, and the upper end of the pumping rod polished rod 11 can transversely move in the length range of the waist groove. The balance adjusting plate 2 is provided with a balance adjusting stud 3 along the central symmetry left and right. The balance adjusting stud 3 is provided with a central circular through hole with a hole diameter which allows a steel wire rope to pass through in the axial direction, the external thread of the balance adjusting stud 3 is matched with the threaded hole on the balance adjusting plate 2, and the height of the balance adjusting stud 3 relative to the balance adjusting plate 2 can be adjusted through a thread pair by rotating the balance adjusting stud 3. The steel wire rope 1 passes through the middle through hole of the balance adjusting stud 3 and is clamped on the lower end surface of the balance adjusting stud 3 through the half joint 6. The number of the load cells 5 is two, the upper ends are symmetrically distributed along the center of the balance adjusting plate 2 through bolt connection, and the lower ends are symmetrically distributed along the center of the sucker rod polish rod supporting plate 8 through bolt connection. The center of the sucker rod polish rod supporting plate 8 is provided with a waist groove through hole, the axis of the waist groove in the length direction is parallel to the long side of the sucker rod polish rod supporting plate 8, the sucker rod polish rod 11 penetrates through the waist groove through hole, the width of the waist groove through hole is slightly larger than the diameter of the sucker rod polish rod 11, and the sucker rod polish rod 11 can transversely move within the length range of the waist groove. The pumping rod polish rod 11 is provided with a step shaft with a shaft diameter larger than the diameter of the pumping rod polish rod 11 at a position which is at a certain distance from the upper end surface, and the diameter of the step shaft is larger than the width of a through hole of a waist groove of the pumping rod polish rod support plate 8. The sucker rod polished rod 11 passes through the waist slot through hole of the sucker rod polished rod support plate 8, and the lower end surface of the step shaft is tightly attached to the upper surface of the sucker rod polished rod support plate 8 under the action of gravity of the sucker rod polished rod 11. The surface of a section of sucker rod polished rod 11 at the lower end of the step shaft is provided with threads, and the lock nut 10 is matched with the sucker rod polished rod through a thread pair. After the position of the sucker rod polish rod 11 is transversely adjusted within the scope of the kidney slot, the lock nut 10 can be used for locking the position of the sucker rod polish rod 11 relative to the sucker rod polish rod support plate 8 through the matching of the thread pair, and meanwhile, the sucker rod polish rod 11 is guaranteed to be strictly perpendicular to the plane of the sucker rod polish rod support plate 8.
As shown in fig. 1 and 2, the upper surface of the sucker rod polish rod support plate 8 is provided with a controller 7 along one side of the center, the other side is provided with a horizontal bubble ruler 9, and two solar cell panels 4 are symmetrically distributed at two ends of the sucker rod polish rod support plate 8. The controller 7 includes: the system comprises a singlechip control module, a communication module with a wireless transmission function, a storage battery, a power management board and the like. The singlechip control module reads the tensile force data measured by the force transducer and the upward and downward stroke data of the sucker rod provided by the photoelectric encoder of the power part of the pumping unit in real time, calculates the real-time power of the pumping unit through force and displacement, and sends power information and load information to a control console of a worker through the communication module with a wireless transmission function, thereby realizing real-time monitoring of the load and the working state of the pumping unit. The solar panel 4 can adjust the plate surface orientation according to the working orientation, so that the left plate and the right plate face to the east and the west respectively and are adjusted to the optimal positions, and the power supply is continuously supplied to the solar panel. The horizontal bubble ruler 9 is tightly attached to the upper surface of the sucker rod polish rod support plate 8 and reflects the levelness of the sucker rod polish rod support plate 8 so as to guide a worker to adjust the sucker rod polish rod support plate 8 to be horizontal.
When the position and the vertical condition of the pumping rod polish rod 11 in the left-right direction need to be adjusted, the locking nut 10 is unscrewed, and the position of the pumping rod polish rod 11 in the left-right direction is transversely finely adjusted in the range of the waist slot of the pumping rod polish rod support plate 8. Simultaneously, the balance adjusting stud 3 is rotated, the sucker rod polish rod supporting plate 8 is adjusted to be horizontal through the matching of the balance adjusting studs 3 at the two ends, the left and right directions of the sucker rod polish rod 11 are vertical to a wellhead, and then the locking nut 10 is screwed to fix the position of the sucker rod polish rod 11.
The scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.
Claims (1)
1. The utility model provides a vertical beam-pumping unit polished rod eye, includes wire rope (1), balance adjustment board (2), balance adjustment double-screw bolt (3), solar cell panel (4), force transducer (5), half festival (6), controller (7), sucker rod polished rod backup pad (8), horizontal bubble chi (9), lock nut (10), sucker rod polished rod (11), its characterized in that: the balance adjusting plate (2) and the sucker rod polish rod supporting plate (8) are horizontally arranged from top to bottom in sequence, the rope end of the steel wire rope (1) is subjected to taper sleeve lead filling treatment, the upper end of the rope end is clamped and fixed by a half joint (6), the center of the balance adjusting plate (2) is provided with a kidney slot through hole, the axis of the length direction of the waist slot through hole is parallel to the long side of the balance adjusting plate (2), the upper end of the pumping rod polish rod (11) passes through the waist slot through hole, the width of the waist slot through hole is slightly larger than the diameter of the upper end of the pumping rod polish rod (11), the upper end of the pumping rod polish rod (11) can transversely move within the length direction range of the waist slot through hole, the balance adjusting plate (2) is respectively provided with a balance adjusting stud (3) along the central symmetry left and right, the balance adjusting studs (3) penetrate through the balance adjusting plate (2), the balance adjusting studs (3) are axially provided with a central round through hole with a pore size allowing a steel wire rope to penetrate through, the external threads of the balance adjusting studs (3) are matched with threaded holes on the balance adjusting plate (2), the height of the balance adjusting stud (3) relative to the balance adjusting plate (2) can be adjusted through the screw pair, the steel wire rope (1) passes through a central circular through hole of the balance adjusting stud (3), the steel wire rope is clamped at the lower end face of the balance adjusting stud (3) through the half joint (6), the number of the two load cells (5) is two, the upper ends of the load cells are connected with the balance adjusting plate (2) through bolts and are symmetrically distributed along the center of the balance adjusting plate (2), the lower ends of the load cells are connected with the sucker rod polish rod support plate (8) through bolts and are symmetrically distributed along the center of the sucker rod polish rod support plate (8), a waist groove through hole is formed in the center of the sucker rod polish rod support plate (8), the axis of the length direction of the waist groove through hole is parallel to the long side of the sucker rod polish rod support plate (8), the pumping rod polish rod (11) passes through the kidney groove through hole, the width of the kidney groove through hole is slightly larger than the diameter of the pumping rod polish rod (11), the pumping rod polish rod (11) can transversely move in the length direction range of the kidney groove through hole, a section of step shaft with the shaft diameter larger than the diameter of the pumping rod polish rod (11) is processed at a position with a certain distance from the upper end surface of the pumping rod polish rod (11), the diameter of the step shaft is larger than the width of the kidney groove through hole of the pumping rod polish rod support plate (8), the pumping rod polish rod (11) passes through the kidney groove through hole of the pumping rod polish rod support plate (8), and the lower end surface of the step shaft is tightly attached to the upper surface of the pumping rod polish rod support plate (8) under the gravity action of the pumping rod polish rod (11); the surface of a section of sucker rod polish rod (11) at the lower end of the step shaft is provided with threads, and a lock nut (10) is positioned below the sucker rod polish rod support plate (8) and is matched with the threads on the surface of the sucker rod polish rod (11) through a thread pair; after the position of the sucker rod polish rod (11) is transversely adjusted within the range of the through hole of the kidney slot, the lock nut can be used for locking the position of the sucker rod polish rod (11) relative to the sucker rod polish rod support plate (8) through the matching of a thread pair, and meanwhile, the sucker rod polish rod (11) is ensured to be strictly perpendicular to the plane of the sucker rod polish rod support plate (8); the upper surface of the sucker rod polish rod support plate (8) is provided with a controller (7) along one side of the center, the other side is provided with a horizontal bubble ruler (9), two solar cell panels (4) are symmetrically distributed at two ends of the sucker rod polish rod support plate (8), the horizontal bubble ruler (9) is tightly attached to the upper surface of the sucker rod polish rod support plate (8), the levelness of the sucker rod polish rod support plate (8) is reflected, and the sucker rod polish rod support plate (8) is used for guiding a worker to adjust the sucker rod polish rod support plate (8) to be horizontal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499851.XA CN109322629B (en) | 2018-12-09 | 2018-12-09 | Vertical pumping unit rope hanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499851.XA CN109322629B (en) | 2018-12-09 | 2018-12-09 | Vertical pumping unit rope hanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109322629A CN109322629A (en) | 2019-02-12 |
| CN109322629B true CN109322629B (en) | 2024-05-28 |
Family
ID=65256680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811499851.XA Active CN109322629B (en) | 2018-12-09 | 2018-12-09 | Vertical pumping unit rope hanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109322629B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482579B (en) * | 2021-08-25 | 2023-02-03 | 陈圣志 | Self-adjusting consumption-reducing energy-saving device of oil pumping unit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87215042U (en) * | 1987-11-01 | 1988-08-31 | 大庆石油管理局第四采油厂 | Antibreaking device of bare rod cable-suspened apparatus for oil pumping well |
| CN2841939Y (en) * | 2005-03-21 | 2006-11-29 | 姚经宇 | Cable suspension device |
| CN101289926A (en) * | 2007-04-20 | 2008-10-22 | 姚经宇 | Polished rod eye without beating clip for bumping pump |
| CN201526290U (en) * | 2009-10-29 | 2010-07-14 | 杨蓬强 | Adjustable deviation prevention polished rod eye of oil extractor |
| CN202360046U (en) * | 2011-10-13 | 2012-08-01 | 河南长江石油机械有限公司 | Polished rod eye slightly-adjusting device |
| CN204175206U (en) * | 2014-07-20 | 2015-02-25 | 李世銮 | A kind of polished rod eye |
| CN104632142A (en) * | 2014-12-31 | 2015-05-20 | 中国石油天然气股份有限公司 | Load safety loading device of oil pumping unit |
| CN209293707U (en) * | 2018-12-09 | 2019-08-23 | 杭州中油智井装备科技有限公司 | A kind of beam hanger of vertical oil pumping unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO340468B1 (en) * | 2010-06-30 | 2017-04-24 | Mhwirth As | Method and system for controlling the movements of a free-hanging pipe body |
-
2018
- 2018-12-09 CN CN201811499851.XA patent/CN109322629B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87215042U (en) * | 1987-11-01 | 1988-08-31 | 大庆石油管理局第四采油厂 | Antibreaking device of bare rod cable-suspened apparatus for oil pumping well |
| CN2841939Y (en) * | 2005-03-21 | 2006-11-29 | 姚经宇 | Cable suspension device |
| CN101289926A (en) * | 2007-04-20 | 2008-10-22 | 姚经宇 | Polished rod eye without beating clip for bumping pump |
| CN201526290U (en) * | 2009-10-29 | 2010-07-14 | 杨蓬强 | Adjustable deviation prevention polished rod eye of oil extractor |
| CN202360046U (en) * | 2011-10-13 | 2012-08-01 | 河南长江石油机械有限公司 | Polished rod eye slightly-adjusting device |
| CN204175206U (en) * | 2014-07-20 | 2015-02-25 | 李世銮 | A kind of polished rod eye |
| CN104632142A (en) * | 2014-12-31 | 2015-05-20 | 中国石油天然气股份有限公司 | Load safety loading device of oil pumping unit |
| CN209293707U (en) * | 2018-12-09 | 2019-08-23 | 杭州中油智井装备科技有限公司 | A kind of beam hanger of vertical oil pumping unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109322629A (en) | 2019-02-12 |
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