CN107672617B - Headrest structure for iron seat - Google Patents
Headrest structure for iron seat Download PDFInfo
- Publication number
- CN107672617B CN107672617B CN201711099651.0A CN201711099651A CN107672617B CN 107672617 B CN107672617 B CN 107672617B CN 201711099651 A CN201711099651 A CN 201711099651A CN 107672617 B CN107672617 B CN 107672617B
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- CN
- China
- Prior art keywords
- piece
- headrest
- cross bar
- clamping
- rib
- Prior art date
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Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 230000007958 sleep Effects 0.000 description 2
- 208000019116 sleep disease Diseases 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D33/00—Seats
- B61D33/0007—Details; Accessories
- B61D33/005—Head, arm or footrests
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
- Seats For Vehicles (AREA)
Abstract
The invention discloses a headrest structure for an iron seat, which comprises a first support rod, wherein a cross rod is fixed at the top of the first support rod, a second support rod is arranged on the cross rod, the first support rod and the second support rod are parallel to each other, and the cross rod is perpendicular to the first support rod and the second support rod; the top end of the second supporting rod is connected with the first mounting plate, the front surface of the first mounting plate is provided with a bottom cross bar, a top cross bar and a headrest piece, the length directions of the bottom cross bar, the top cross bar and the headrest piece are all parallel to the axis of the cross bar, and the headrest piece is positioned between the bottom cross bar and the top cross bar; the headrest piece comprises a middle rib fixedly connected with the first mounting plate and end ribs connected to two ends of the middle rib, and the end ribs are hinged with the middle rib. The invention is used for solving the problem that the heads of passengers are easy to swing along with the shaking of the air iron in the prior art, and achieving the purposes of improving the stability of the passengers in the air iron operation process and facilitating the sleeping and rest of the passengers.
Description
Technical Field
The invention relates to the field of iron seat, in particular to a headrest structure for an iron seat.
Background
The overhead rail, i.e. the suspended overhead monorail transportation system, is different from subways and trams, and the overhead rail is a rail transportation suspended on the overhead rail to run. The air-railway is novel new energy public transportation, integrates the advantages of urban Bus Rapid Transit (BRT) and subway, and has the advantages of relieving traffic jams, high passenger carrying efficiency, low cost, short construction period, no occupation of parking lots, energy conservation, environmental protection and the like. The air rail is suspended below the air rail for running, and the lower part of the air rail is not supported by objects, so that compared with the traditional rail traffic running on the ground, the air rail has slightly insufficient stability. When the reaction is on the riding experience of the passengers, and the passengers sit on the seats in the empty iron, the passengers can shake at the acceleration and deceleration or turning lane positions, so that the passengers have poor riding experience. Particularly, when a passenger sleeps, the head of the passenger swings due to the shaking of the vehicle body, so that the passenger in sleep is awakened, and a very poor riding experience is caused.
Disclosure of Invention
The invention aims to provide a headrest structure for an iron seat, which solves the problem that the head of a passenger swings easily along with the shake of iron in the prior art, and achieves the purposes of improving the stability of the inner passenger in the running process of iron and facilitating the sleeping and rest of the passenger.
The invention is realized by the following technical scheme:
the headrest structure for the iron seat comprises a first supporting rod, wherein a cross rod is fixed at the top of the first supporting rod, a second supporting rod is arranged on the cross rod, the first supporting rod and the second supporting rod are parallel to each other, and the cross rod is perpendicular to the first supporting rod and the second supporting rod; the top end of the second supporting rod is connected with the first mounting plate, the front surface of the first mounting plate is provided with a bottom cross bar, a top cross bar and a headrest piece, the length directions of the bottom cross bar, the top cross bar and the headrest piece are all parallel to the axis of the cross bar, and the headrest piece is positioned between the bottom cross bar and the top cross bar; the headrest piece comprises a middle rib fixedly connected with the first mounting plate and end ribs connected to two ends of the middle rib, and the end ribs are hinged with the middle rib.
Aiming at the problem that the head of a passenger swings easily along with the shaking of an iron in the prior art, the invention provides a headrest structure for an iron seat. The cross bar is fixed at first bracing piece top, the cross bar is used for improving the horizontal bearing capacity of headrest position, provides the place of leaning on for passenger's neck simultaneously. The cross rod is provided with a second supporting rod for supporting the main body of the headrest, the top end of the second supporting rod is connected with a first mounting plate, and the first mounting plate is used for mounting a bottom cross bar, a top cross bar and a headrest piece. As the name suggests, the bottom rail is positioned at the bottom and the top rail is positioned at the top, which together outline the whole range of the headrest, and the headrest piece is arranged between the bottom rail and the top rail. The length directions of the bottom cross bars, the top cross bars and the headrest sheets are all parallel to the axis of the cross bars, so that the bottom cross bars, the top cross bars and the headrest sheets are all transversely distributed at the rear of passengers, and unified and comfortable body feeling is provided for the heads of the passengers. The headrest piece comprises a middle rib and end ribs, wherein the end ribs are connected with the two ends of the middle rib, so that each middle rib is connected with two end ribs. The end rib is hinged to the middle rib so that the end rib can rotate around the fixed middle rib. In particular, during use, the passenger leans the head against the headrest piece between the bottom transverse bar and the top transverse bar, and the head of the passenger is positioned on the middle rib at the moment, and the head of the passenger can be protected from the rear through the first mounting plate because the middle rib is fixed on the first mounting plate. The end ribs are rotated again at the moment, so that the end ribs on two sides rotate towards the head direction of the passenger, the heads of the passenger are coated on the two sides, the heads of the passenger are protected and stabilized, the heads of the passenger after sleeping cannot swing easily along with the shaking of the empty iron, the stability of the passenger during resting and sleeping is greatly improved, and more comfortable riding feeling is provided for the passenger. The rotating end rib can be used by a crewmember to assist a passenger, and the passenger can also rotate to a proper angle according to own needs.
Preferably, the end face of the middle rib facing the end rib is provided with a connecting shaft, the connecting shaft is sleeved with a circular ring, the circular ring is fixedly connected with a rotary piece, the rotary piece is perpendicular to the axis of the connecting shaft, and the rotary piece is fixedly connected with the adjacent end rib. Namely, the end face of the middle rib facing the end rib is provided with the connecting shaft, so that the connecting shaft and the middle rib are fixed into a whole, and the connecting shaft is sleeved with the ring, so that the ring can rotate on the connecting shaft. The rotary piece is fixedly connected to the circular ring and is perpendicular to the axis of the connecting shaft, so that the rotary piece is perpendicular to the axis of the circular ring, and the rotary piece can not influence the rotation of the circular ring, but can rotate together with the rotation of the circular ring. The rotary piece is fixedly connected with the adjacent end rib, namely the rotary piece is fixedly connected with the end rib on the corresponding side, and the connection point is preferably arranged on the end face of the end rib facing the middle rib. And the end rib is driven to rotate along with the rotation of the rotating piece, so that the hinge joint between the middle rib and the end rib is realized. Compared with the conventional hinging mode, the hinging mode in the scheme is realized by the connecting shaft, the circular ring and the rotating piece, so that the stability of the end rib in the rotating process is greatly improved.
Furthermore, the back of the headrest piece is provided with an elastic strip, and the elastic strip is fixedly connected with the middle rib and the end rib; the device also comprises a clamping device used for clamping the rotary piece and a driving device used for controlling the clamping device to clamp or release the rotary piece. When the clamping device clamps the rotary piece, the rotary piece cannot rotate freely under the action of external force, and the end rib cannot rotate at the moment, so that the end rib is fixed. The clamping device can be realized by using a clamp, a brake sheet, a brake disc and the like in the prior art, and any existing device capable of limiting the rotary sheet to rotate can be realized, such as a brake sheet of a bicycle. When the passengers do not need to wrap the end rib, the end rib can be opened and reset to two sides under the elastic reset force of the elastic strip only by loosening the clamping of the clamping device to the rotating sheet. Likewise, the driving device is used for controlling the locking device to clamp or unclamp the rotating plate, so any structure of the locking device in the prior art can be used in the present application, such as the control structure of the clamp and the brake pad in the prior art, and therefore the present application is not limited thereto. The clamping or loosening of the rotating sheet by the clamping device is controlled by the driving device, so that whether the end rib rotates or not can be controlled.
Preferably, the locking device comprises two locking pieces, wherein the locking pieces are composed of control parts and locking parts which form an obtuse angle with each other, the control parts of the two locking pieces are mutually hinged through a rotating shaft, the two control parts are also connected through an elastic piece, and the elastic piece is positioned in the direction of one side of the rotating shaft away from the locking parts; the two clamping parts are respectively positioned at two sides of the rotary piece, and when the elastic piece is in a natural state, the two clamping parts are not contacted with the rotary piece. In this scheme, when two control portions draw close each other, when compressing the elastic component in the middle, because hinge each other through the pivot between the control portion of two blocks of locking piece this moment, consequently the distance between two blocks of locking portions also can be close to each other to the realization is to the chucking of the revolving fragment that is located between two blocks of locking portions, makes the revolving fragment can't rotate any more, thereby makes the tip fin can't rotate, realizes the fixed to the tip fin. When the clamping part releases the clamping of the rotating piece, the clamping device in the scheme automatically resets under the action of the elastic piece, so that the end rib is released. In this scheme, the connection between the two locking pieces is the connection mode of the scissors in the prior art, and no description is given here.
Preferably, through grooves are formed in the surfaces of the rotating pieces, and the end portions of the two clamping portions are located on two sides of the through grooves respectively. When two clamping parts are close to each other, the two clamping parts enter the through groove, the side wall of the through groove is used for limiting the end part of the clamping part, so that the clamping capacity of the clamping part on the rotary piece is further improved, and the stability of fixing the end part rib is improved.
Preferably, the driving device is a silk thread fixed on the outer side surface of the clamping part, and two silk threads respectively extend from the two control parts and are combined into one silk thread. The two threads are combined into one thread, which is convenient for reducing thread ends and is beneficial to the operation and control of users. The user only need pull the silk thread to the direction that keeps away from the locking device for on two silk threads atress is transmitted effort to two control portions respectively, because two silk threads are the one-tenth, consequently the atress of two control portions can make two control portions move towards the direction that draws close each other, thereby realized through pulling the silk thread, fold the effect to the locking portion, thereby simple quick efficient realization is to the chucking function of rotating the piece.
Preferably, the wire is connected to a winding mechanism. The silk thread is rapidly wound and unwound through the winding mechanism, so that passengers can conveniently and simply control the fitting degree of the end rib on the body cladding. The winding mechanism can be implemented as a winder in the prior art, and will not be described in detail herein.
Further, two second mounting plates which are distributed up and down are arranged on the end face, facing to the end part rib, of the middle rib, and two ends of the connecting shaft are respectively fixed on the two second mounting plates. The second mounting plate is arranged, so that the distance between the connecting shaft and the middle rib can be freely set, and the problem that the ring is inconvenient to mount due to too small distance is solved; and meanwhile, the two ends of the connecting shaft are limited, so that the stability of the connecting shaft is provided, and the condition that the circular ring falls off from the connecting shaft is prevented, thereby improving the overall stability of the connecting shaft.
Preferably, the first support rod is a telescopic rod. The first telescopic rod is a structure for being connected with the backrest, so that a passenger can adjust the height of the headrest part according to the height of the passenger by arranging the first telescopic rod as the telescopic rod, and the humanization degree and the applicability of the seat backrest are improved.
Preferably, the second support rod is hinged with the first mounting plate. The angle of the first mounting plate can be adjusted, so that the angles of the bottom cross bar, the top cross bar and the headrest piece are adjusted, passengers can adjust the angles of leaning heads according to the needs of the passengers, and the humanization degree of the invention is improved.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the headrest structure for the iron seat has the advantages that the head of a passenger leans against the headrest piece between the bottom transverse bar and the top transverse bar, the head of the passenger is positioned on the middle rib, and the middle rib is fixed on the first mounting plate, so that the head of the passenger can be protected from the rear through the first mounting plate.
2. The headrest structure for the iron seat rotates the end ribs, so that the end ribs on two sides rotate towards the head direction of a passenger, and the heads of the passenger are covered from two sides, thereby protecting and stabilizing the heads of the passenger, enabling the heads of the passenger after sleeping to not swing easily along with the shake of the iron seat, greatly improving the stability of the passenger when the passenger is resting and sleeping, and providing more comfortable riding feeling for the passenger.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of the end face of the middle rib in an embodiment of the invention;
FIG. 4 is a cross-sectional view of the connection between the middle rib and the end rib in an embodiment of the invention;
FIG. 5 is a schematic view of the structure of the ring and the rotary plate according to the embodiment of the present invention;
fig. 6 is a schematic diagram illustrating connection between the locking device and the rotary plate according to an embodiment of the invention.
In the drawings, the reference numerals and corresponding part names:
the device comprises a first supporting rod, a 2-cross rod, a 3-second supporting rod, a 4-first mounting plate, a 5-bottom cross bar, a 6-top cross bar, 7-middle ribs, 8-end ribs, a 9-connecting shaft, a 10-circular ring, 11-rotating pieces, 12-clamping devices, 121-control parts, 122-clamping parts, 13-driving devices, 14-elastic bars, 15-elastic pieces, 16-through grooves, 17-rotating shafts and 18-second mounting plates.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1:
the headrest structure for the iron chair shown in fig. 1 and 2 comprises a first supporting rod 1, wherein a cross rod 2 is fixed at the top of the first supporting rod 1, a second supporting rod 3 is arranged on the cross rod 2, the first supporting rod 1 and the second supporting rod 3 are parallel to each other, and the cross rod 2 is perpendicular to the first supporting rod 1 and the second supporting rod 3; the top end of the second supporting rod 3 is connected with the first mounting plate 4, the front surface of the first mounting plate 4 is provided with a bottom cross bar 5, a top cross bar 6 and a headrest piece, the length directions of the bottom cross bar 5, the top cross bar 6 and the headrest piece are all parallel to the axis of the cross bar 2, and the headrest piece is positioned between the bottom cross bar 5 and the top cross bar 6; the headrest piece comprises a middle rib 7 fixedly connected with the first mounting plate 4 and end ribs 8 connected with two ends of the middle rib 7, and the end ribs 8 are hinged with the middle rib 7.
Example 2:
as shown in fig. 1 to 6, in the headrest structure for an iron seat, on the basis of embodiment 1, a connecting shaft 9 is disposed on the end surface of the middle rib 7 facing the end rib 8, a ring 10 is sleeved on the connecting shaft 9, a rotating piece 11 is fixedly connected to the ring 10, the rotating piece 11 is perpendicular to the axis of the connecting shaft 9, and the rotating piece 11 is fixedly connected with the adjacent end rib 8. The back of the headrest piece is provided with an elastic strip 14, and the elastic strip 14 is fixedly connected with the middle rib 7 and the end rib 8; further comprises a locking device 12 for locking the rotary piece 11, and a driving device 13 for controlling the locking device 12 to lock or unlock the rotary piece 11. The locking device 12 comprises two locking pieces, wherein the locking pieces are composed of control parts 121 and locking parts 122 which form an obtuse angle with each other, the control parts 121 of the two locking pieces are mutually hinged through a rotating shaft 17, the two control parts 121 are also connected through an elastic piece 15, and the elastic piece 15 is positioned in the direction of one side of the rotating shaft 17 away from the locking parts 122; the two locking parts 122 are respectively located at two sides of the rotary piece 11, and when the elastic piece 15 is in a natural state, neither locking part 122 is in contact with the rotary piece 11. The surface of the rotary plate 11 is provided with a through groove 16, and the ends of the two locking parts 122 are respectively positioned at two sides of the through groove 16. The driving device 13 is a yarn fixed to the outer side surface of the locking portion 122, and two yarns are respectively protruded from the two control portions 121 and combined into one yarn. A winding mechanism is also included, to which the wire is connected. The end face of the middle rib 7 facing the end rib 8 is provided with two second mounting plates 18 which are distributed up and down, and two ends of the connecting shaft 9 are respectively fixed on the two second mounting plates 18. The first supporting rod 1 is a telescopic rod. The second support rod 3 is hinged with the first mounting plate 4.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The headrest structure for the iron seat is characterized by comprising a first supporting rod (1), wherein a cross rod (2) is fixed at the top of the first supporting rod (1), a second supporting rod (3) is arranged on the cross rod (2), the first supporting rod (1) and the second supporting rod (3) are mutually parallel, and the cross rod (2) is perpendicular to the first supporting rod (1) and the second supporting rod (3); the top end of the second supporting rod (3) is connected with the first mounting plate (4), the front surface of the first mounting plate (4) is provided with a bottom cross bar (5), a top cross bar (6) and a headrest piece, the length directions of the bottom cross bar (5), the top cross bar (6) and the headrest piece are all parallel to the axis of the cross bar (2), and the headrest piece is positioned between the bottom cross bar (5) and the top cross bar (6); the headrest piece comprises a middle rib (7) fixedly connected with the first mounting plate (4) and end ribs (8) connected with two ends of the middle rib (7), and the end ribs (8) are hinged with the middle rib (7);
the end face of the middle rib (7) facing the end rib (8) is provided with a connecting shaft (9), the connecting shaft (9) is sleeved with a circular ring (10), the circular ring (10) is fixedly connected with a rotary piece (11), the rotary piece (11) is perpendicular to the axis of the connecting shaft (9), and the rotary piece (11) is fixedly connected with the adjacent end rib (8);
the back of the headrest piece is provided with an elastic strip (14), and the elastic strip (14) is fixedly connected with the middle rib (7) and the end rib (8); the device also comprises a clamping device (12) for clamping the rotary piece (11), and a driving device (13) for controlling the clamping device (12) to clamp or unclamp the rotary piece (11);
the clamping device (12) comprises two clamping pieces, wherein the clamping pieces are composed of control parts (121) and clamping parts (122) which form an obtuse angle with each other, the control parts (121) of the two clamping pieces are mutually hinged through a rotating shaft (17), the two control parts (121) are also connected through an elastic piece (15), and the elastic piece (15) is positioned in the direction of one side, away from the clamping parts (122), of the rotating shaft (17); the two clamping parts (122) are respectively positioned at two sides of the rotary piece (11), and when the elastic piece (15) is in a natural state, the two clamping parts (122) are not contacted with the rotary piece (11);
the surface of the rotary piece (11) is provided with a through groove (16), and the end parts of the two clamping parts (122) are respectively positioned at two sides of the through groove (16);
the driving device (13) is a silk thread fixed on the outer side surface of the clamping part (122), and two silk threads respectively extend out of the two control parts (121) and are combined into one silk thread;
a winding mechanism is also included, to which the wire is connected.
2. Headrest structure for iron-empty seats according to claim 1, characterized in that the end face of the middle rib (7) facing the end rib (8) is provided with two second mounting plates (18) distributed up and down, the two ends of the connecting shaft (9) being fixed to the two second mounting plates (18) respectively.
3. Headrest structure for iron seat according to claim 1, characterized in that the first support bar (1) is a telescopic bar.
4. Headrest structure for iron seat according to claim 1, characterized in that the second support bar (3) is hinged with the first mounting plate (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711099651.0A CN107672617B (en) | 2017-11-09 | 2017-11-09 | Headrest structure for iron seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711099651.0A CN107672617B (en) | 2017-11-09 | 2017-11-09 | Headrest structure for iron seat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107672617A CN107672617A (en) | 2018-02-09 |
| CN107672617B true CN107672617B (en) | 2024-02-06 |
Family
ID=61145853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711099651.0A Active CN107672617B (en) | 2017-11-09 | 2017-11-09 | Headrest structure for iron seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107672617B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108790972B (en) * | 2018-06-22 | 2023-07-25 | 麦克英孚(宁波)婴童用品有限公司 | Headrest height adjusting mechanism of child seat and child seat using same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990019146A (en) * | 1997-08-29 | 1999-03-15 | 양재신 | Headrests of cars with sleep function |
| DE102004059864A1 (en) * | 2004-12-11 | 2006-06-14 | Recaro Aircraft Seating Gmbh & Co. Kg | Headrest for a seat, in particular passenger seat |
| CN202782777U (en) * | 2012-09-04 | 2013-03-13 | 浙江吉利汽车研究院有限公司杭州分公司 | Car seat headrest |
| CN204586583U (en) * | 2015-04-28 | 2015-08-26 | 长城汽车股份有限公司 | Vehicle seat head rest supporting construction and seat |
| CN207374406U (en) * | 2017-11-09 | 2018-05-18 | 中唐空铁集团有限公司 | For the headrest features of empty iron seat |
-
2017
- 2017-11-09 CN CN201711099651.0A patent/CN107672617B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990019146A (en) * | 1997-08-29 | 1999-03-15 | 양재신 | Headrests of cars with sleep function |
| DE102004059864A1 (en) * | 2004-12-11 | 2006-06-14 | Recaro Aircraft Seating Gmbh & Co. Kg | Headrest for a seat, in particular passenger seat |
| CN202782777U (en) * | 2012-09-04 | 2013-03-13 | 浙江吉利汽车研究院有限公司杭州分公司 | Car seat headrest |
| CN204586583U (en) * | 2015-04-28 | 2015-08-26 | 长城汽车股份有限公司 | Vehicle seat head rest supporting construction and seat |
| CN207374406U (en) * | 2017-11-09 | 2018-05-18 | 中唐空铁集团有限公司 | For the headrest features of empty iron seat |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107672617A (en) | 2018-02-09 |
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