CN103758814A - Buffer casting air cylinder - Google Patents
Buffer casting air cylinder Download PDFInfo
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- CN103758814A CN103758814A CN201310753147.3A CN201310753147A CN103758814A CN 103758814 A CN103758814 A CN 103758814A CN 201310753147 A CN201310753147 A CN 201310753147A CN 103758814 A CN103758814 A CN 103758814A
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- screw rod
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- 238000005266 casting Methods 0.000 title abstract 4
- 230000003139 buffering effect Effects 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 238000013022 venting Methods 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000001737 promoting effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention discloses a buffer casting air cylinder and belongs to the technical field of air cylinders. The air cylinder comprises a screw, an end cover, a nut, a left piston, an elastic cylindrical pin, a right piston, a cylinder body, a main spring, a retaining block, a cylindrical pin, a large connection rod, a small connection rod, an auxiliary spring, a guider ring, a push rod, a rolling seat, a compression rod, a sealing ring and a guide block. According to the air cylinder, dual buffering can be achieved, the primary buffering is achieved through the main spring, and the secondary buffering is achieved through a buffering mechanism formed by the retaining block, the cylindrical pin, the small connection rod and the auxiliary spring, so that the casting safety and reliability can be achieved, the device can be used repeatedly, and the manufacture and usage cost is saved; the device casting is achieved by completely depending on the structure, so that the operation and the maintenance are facilitated; meanwhile, heavy substances can be cast rapidly by the air cylinder in case of the limited cylinder diameter, and a good buffering effect is provided.
Description
Technical field
Invention relates to a kind of cylinder, be specifically related to a kind of treat to throw put object and apply to throw and put the cylinder of power, belong to cylinder technical field.
Background technique
Throw venting cylinder and be widely used in the fields such as engineering machinery and military project, its kind and model are many, are a kind of for realizing the actuator of straight reciprocating motion, have the advantages that movement velocity is fast, sealing requirements is high.When throwing, to put thing weight large, require to throw and put the time in short-term, the piston of throwing venting cylinder is large to the impact force of cylinder body, has affected join strength and the working life of cylinder body, and in throwing, let slip the huge Strike note of product in journey, therefore on throwing venting cylinder, damping mechanism being set becomes problem in the urgent need to address.
Summary of the invention
In view of this, the invention provides a kind of venting cylinder of throwing, in the situation that cylinder bore is limited, also can realize the weight of dishing out fast, and there is good cushioning effect.
One is thrown venting cylinder, is comprised screw rod, end cap, nut, left piston, elastic cylindrical pin, right piston, cylinder body, main spring, block, straight pin, major connector, connector bar, auxiliary spring, guide ring, push rod, rolling seat, screw, constrictor, seal ring and guide pad.
Wherein, screw rod is with axial center hole, and the cylindrical section of its one end is the connecting end being connected with external high pressure gas cylinder, and the cylindrical section of the other end is the connecting end being connected with left piston, and remaining part is thread section;
Cylinder body, major connector and connector bar are the open circles column sleeve of both ends open, one end of cylinder body is the mounting end that screw rod and left piston and right piston are installed, the other end is the mounting end that the seat that rolls is installed, and on the outer peripheral surface of cylinder body and the seat mounting end that rolls, by end face, is risen and is had one section of axial groove that runs through cylinder sleeve wall thickness; On the outer peripheral surface of major connector one end, be processed with thread section, on the excircle of the other end, have the axial groove that runs through major connector wall thickness; On the outer peripheral surface of connector bar one end, be processed with thread section;
Its annexation is: one end that screw rod is installed at cylinder body, after being set with seal ring on the excircle of left piston and right piston, be arranged in cylinder body, the opposing side of left piston and right piston forms airtight air cavity in cylinder body, screw rod is engaged in cylinder body by nut support by its thread section, one end of screw rod is fixed itself and left piston by elastic cylindrical pin through after left piston, the fitting surface of screw rod and left piston is realized sealing by the seal ring being arranged on left piston, and end cap carries out axial limiting at cylinder body end face by nut; One end of the seat that rolls is installed at cylinder body, after being set with guide ring and guide pad on the excircle of rolling seat, be arranged in cylinder body, push rod along roll seat radially installation therein, push rod stretches out cylinder body by the axial groove on cylinder body, part outside its cylinder body is treated to throw and is put object applied thrust, capping, by this end sealing of cylinder body, is installed one deck cushion pad on the internal surface of capping;
The two ends of connector bar are respectively charged into block and constrictor, it between block and constrictor, is auxiliary spring, one end that connector bar is threaded section is fixedly connected with the seat that rolls, constrictor axially passes push rod and the seat that rolls along cylinder body, the other end of connector bar is sleeved on major connector and has one end of axial groove, straight pin is locked in block on connector bar, and straight pin limits connector bar can only be at the axial groove intrinsic displacement of major connector; The other end of major connector is fixedly connected with right piston, conflicts respectively and be arranged on right piston and roll between seat in the two ends of main spring, and major connector and connector bar entirety are positioned at main spring.
Further, have the exhaust port that runs through wall thickness on the outer peripheral surface of cylinder body, exhaust port is on the cylindrical section near the seat that rolls between right piston and push rod; While making cylinder operation, deposit the chamber indoor gas of spring and discharge fast by exhaust port, improve the working efficiency of cylinder.
Further, on the outer peripheral surface of connector bar, have the exhaust port that runs through wall thickness, exhaust port be positioned at roll seat connecting end cylindrical section on;
Further, the load end installed thrust bearing of screw rod and left piston, can reduce screw rod and be screwed into the resistance to motion while back-outing.
Further, on cylinder body, the position of axial groove is provided with slide plate, and it is upper that slide plate is fixedly mounted on the seat that rolls, and follows the seat that rolls and is synchronized with the movement, and slide plate stops that foreign matter and dust enter cylinder interior.
Working procedure: when working state, the left end of screw rod is connected with gas cylinder, push rod is positioned at part outside cylinder body to be put thing and contact with waiting to throw, main spring is by precompression, energy accumulation, when needs, treat to throw and put thing and throw while putting, in screw rod, pass into pressurized gas, pressurized gas expand in the airtight chamber being comprised of left piston and right piston, promoting right piston and connecting rod moves right along inboard wall of cylinder block, further Compress Spring, when putting after instantaneous the laying down of locking force of thing wait throwing, under the acting in conjunction of pressurized gas and spring, to wait to throw and put thing and dish out, now, the end of constrictor contacts with the cushion pad in capping, realize buffering, constrictor stops compressing auxiliary spring after displacement, connector bar and constrictor produce relative displacement, in displacement process, the head of constrictor is by after the exhaust port sealing on connector bar, the inner chamber of connector bar forms airtight chamber, air and the auxiliary spring of constrictor to airtight chamber compresses, at main spring, under the buffer function of auxiliary spring and airtight chamber, complete to throw and let slip journey.
Before reusing, need to throw venting cylinder and reset, be about to screw rod and oppositely back-out, the main spring length that affranchises, by pulling push rod, throws and puts after thing playback, then be screwed into screw rod and compress main spring, again enters and treats working state.
Beneficial effect:
1, the present invention can realize double buffering, and first-level buffer is realized by main spring, and level 2 buffering is by block, straight pin, the damping mechanism of connector bar and auxiliary spring composition is realized, and can guarantee to throw the safety and reliability of putting, device can be reused, and can save and throw the manufacturing cost and use cost of putting device.The throwing of device is put with buffering course and is relied on structure to realize completely, convenient operation and maintenance.
2, screw rod of the present invention is screw rod with holes, can Compress Spring and help spring reset by screw rod, and the amount that adjusting screw rod is screwed into, decrement that can control spring.Screw rod, simultaneously also for transport gas, makes whole mechanism structure compactness.
3, the present invention sets up thrust-bearing between screw rod and piston, has reduced screw rod and has coordinated the resistance to motion producing while promoting piston movement with nut, is conducive to personnel and operates.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Wherein, 1-screw rod, 2-end cap, 3-nut, 4-left piston, 5-elastic cylindrical pin, the right piston of 6-, 7-cylinder body, 8-main spring, 9-block, 10-straight pin, 11-major connector, 12-connector bar, 13-auxiliary spring, 14-exhaust port, 15-guide ring, 16-push rod, 17-roll seat, 18-screw, 19-constrictor, 20-slide plate, 21-cushion pad, 22-thrust-bearing, 23-seal ring I, 24-seal ring II, 25-seal ring III, 26-guide pad, 27-capping.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
As shown in Figure 1, the invention provides a kind of buffering and throw venting cylinder, comprise screw rod 1, end cap 2, nut 3, left piston 4, elastic cylindrical pin 5, right piston 6, cylinder body 7, main spring 8, block 9, straight pin 10, major connector 11, connector bar 12, auxiliary spring 13, guide ring 15, push rod 16, roll seat 17, constrictor 19, cushion pad 21, seal ring I 23, seal ring II 24, seal ring III 25, guide pad 26 and capping 27, peripheral unit is thrown and is put dashed rectangle part in thing A(figure for band) and gas cylinder.
Wherein, screw rod 1 is with axial center hole, and the cylindrical section of its one end is the connecting end being connected with external high pressure gas cylinder, and the cylindrical section of the other end is the connecting end being connected with left piston 4, and remaining part is thread section;
Cylinder body 7, major connector 11 and connector bar 12 are the open circles column sleeve of both ends open, one end of cylinder body 7 is the mounting end that screw rod 1 and left piston 4 and right piston 6 are installed, the other end is the mounting end that the seat 17 that rolls is installed, and on the outer peripheral surface of cylinder body 7 and seat 17 mounting ends that roll, by end face, is risen and is had one section of axial groove that runs through cylinder body 7 wall thickness; On the outer peripheral surface of major connector 11 one end, be processed with thread section, on the excircle of the other end, have the axial groove that runs through major connector 11 wall thickness; On the outer peripheral surface of connector bar 12 one end, be processed with thread section;
Its annexation is: one end that screw rod 1 is installed at cylinder body 7, on the excircle of left piston 4 and right piston 6, be set with by being arranged in cylinder body 7 after seal ring I 23 and seal ring III 25, the opposing side of left piston 4 and right piston 6 is at the airtight air cavity of the interior formation of cylinder body 7, screw rod 1 is supported and is engaged in cylinder body 7 by nut 3 by its thread section, one end of screw rod 1 is through by elastic cylindrical pin 5, itself and left piston 4 being fixed after left piston 4, screw rod 1 is realized sealing with the fitting surface of left piston 4 by the seal ring II 24 being arranged on left piston 4, end cap 2 carries out axial limiting at cylinder body 7 end faces to nut 3 and left piston 4, one end of the seat 17 that rolls is installed at cylinder body 7, after being set with guide ring 15 and guide pad 26 on the excircle of rolling seat 17, be arranged in cylinder body 7, the radially installation of push rod 16 edge rolling seats 17 therein, push rod 16 stretches out cylinder body 7 by the axial groove on cylinder body 7, part outside its cylinder body 7 is treated to throw and is put thing A applied thrust, capping 27, by this end sealing of cylinder body 7, is installed one deck cushion pad 21 on the internal surface of capping 27,
The two ends of connector bar 12 are respectively charged into block 9 and constrictor 19, between block 9 and constrictor 19, it is auxiliary spring 13, one end that connector bar 12 is threaded section is fixedly connected with the seat 17 that rolls, constrictor 19 axially passes push rod 16 and the seat 17 that rolls along cylinder body, the other end of connector bar 12 is sleeved on major connector 11 and has one end of axial groove, straight pin 10 is locked in block 9 on connector bar 12, and straight pin 10 limits connector bar 12 can only be at the axial groove intrinsic displacement of major connector 11; The other end of major connector 11 is fixedly connected with right piston 6, conflicts respectively and be arranged on right piston 6 and roll between seat 17 in the two ends of main spring 8, and major connector 11 and connector bar 12 entirety are positioned at main spring 8.
Further, have the exhaust port 14 that runs through wall thickness on the outer peripheral surface of cylinder body 7, exhaust port 14 is on the cylindrical section between right piston 6 and push rod 16; While making cylinder operation, deposit the chamber indoor gas of main spring 8 and discharge fast by exhaust port, improve the working efficiency of cylinder.
Further, on the outer peripheral surface of connector bar 12, have the exhaust port that runs through wall thickness, exhaust port be positioned at roll seat 17 connecting ends cylindrical section on;
Further, the load end installed thrust bearing 22 of screw rod 1 and left piston 4, can reduce screw rod 1 and be screwed into the resistance to motion while back-outing.
Further, on cylinder body 7, the position of axial groove is provided with slide plate 20, and slide plate 20 is fixedly mounted on and is rolled on seat 17 by screw 18, follows the seat 17 that rolls and is synchronized with the movement, and slide plate 20 stops that foreign matter and dust enter cylinder interior.
Working procedure: when working state, the left end of screw rod 1 is connected with gas cylinder, push rod 16 is put thing A and contacted with being thrown, main spring 8 is by precompression, energy accumulation, when needs, treat to throw and put thing A and throw while putting, in screw rod 1, pass into pressurized gas, pressurized gas expand in the airtight chamber being comprised of left piston 4 and right piston 6, promoting right piston 6 and major connector 11 moves right along inboard wall of cylinder block, further compression main spring 8, when putting after instantaneous the laying down of locking force of thing A wait throwing, under the acting in conjunction of pressurized gas and main spring 8, to wait to throw and put thing A and dish out, now, the end of constrictor 19 contacts with the cushion pad 21 in capping, realize buffering, constrictor 19 stops compressing auxiliary spring 13 after displacement, connector bar 12 produces relative displacement with constrictor 19, in displacement process, the head of constrictor 19 is by after the exhaust port sealing on connector bar 12, the inner chamber of connector bar 12 forms airtight chamber, air and the auxiliary spring 13 of constrictor 19 to airtight chamber compresses, at main spring, under the buffer function of auxiliary spring and airtight chamber, complete to throw and let slip journey.
Before reusing, need to throw venting cylinder and reset, be about to screw rod 1 and oppositely back-out, main spring 8 length that affranchises, by pulling push rod 16, throws and puts after thing playback, then be screwed into screw rod 1 and compress main spring 8, again enters and treats working state.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a buffering is thrown venting cylinder, it is characterized in that, comprise: screw rod (1), end cap (2), nut (3), left piston (4), elastic cylindrical pin (5), right piston (6), cylinder body (7), main spring (8), block (9), straight pin (10), major connector (11), connector bar (12), auxiliary spring (13), guide ring (15), push rod (16), seat (17) rolls, constrictor 19, cushion pad 21, seal ring I 23, seal ring II 24, seal ring III (25), guide pad (26) and capping (27), peripheral unit is thrown and is put thing A and gas cylinder for band.
Wherein, screw rod (1) is with axial center hole, and the cylindrical section of its one end is the connecting end being connected with external high pressure gas cylinder, and the cylindrical section of the other end is the connecting end being connected with left piston (4), and remaining part is thread section;
Cylinder body (7), major connector (11) and connector bar (12) are the open circles column sleeve of both ends open, one end of cylinder body 7 is for installing the mounting end of screw rod (1) and left piston (4) and right piston (6), the other end, for the mounting end of the seat (17) that rolls is installed, is risen by end face and has one section of axial groove that runs through cylinder body (7) wall thickness on the outer peripheral surface of cylinder body (7) and seat (17) mounting end that rolls; On the outer peripheral surface of major connector (11) one end, be processed with thread section, on the excircle of the other end, have the axial groove that runs through major connector (11) wall thickness; On the outer peripheral surface of connector bar (12) one end, be processed with thread section;
Its annexation is: one end that screw rod (1) is installed at cylinder body (7), on the excircle of left piston (4) and right piston (6), be set with by being arranged in cylinder body (7) after seal ring I (23) and seal ring III (25), the opposing side of left piston (4) and right piston (6) forms airtight air cavity in cylinder body (7), screw rod (1) is supported and is engaged in cylinder body (7) by nut (3) by its thread section, one end of screw rod (1) is through by elastic cylindrical pin (5), itself and left piston (4) being fixed after left piston (4), screw rod (1) is realized sealing with the fitting surface of left piston (4) by the seal ring II (24) being arranged on left piston (4), end cap (2) carries out axial limiting at cylinder body (7) end face to nut (3) and left piston (4), one end of the seat (17) that rolls is installed at cylinder body (7), after being set with guide ring (15) and guide pad (26) on the excircle of rolling seat (17), be arranged in cylinder body (7), the radially installation of push rod (16) edge rolling seat (17) therein, push rod (16) stretches out cylinder body (7) by the axial groove on cylinder body (7), the outer part of its cylinder body (7) is treated to throw and is put thing A applied thrust, capping (27), by this end sealing of cylinder body (7), is installed one deck cushion pad (21) on the internal surface of capping (27),
The two ends of connector bar (12) are respectively charged into block (9) and constrictor (19), between block (9) and constrictor 19, be auxiliary spring (13), one end that connector bar (12) is threaded section is fixedly connected with the seat (17) that rolls, constrictor (19) axially passes push rod (16) and the seat (17) that rolls along cylinder body, the other end of connector bar (12) is sleeved on major connector (11) and has one end of axial groove, straight pin (10) is locked in block (9) on connector bar (12), straight pin (10) limits connector bar (12) can only be at the axial groove intrinsic displacement of major connector (11), the other end of major connector (11) is fixedly connected with right piston (6), conflicts respectively and be arranged on right piston (6) and roll between seat (17) in the two ends of main spring (8), and major connector (11) and connector bar (12) entirety are positioned at main spring (8).
2. buffering as claimed in claim 1 is thrown venting cylinder, it is characterized in that, on the outer peripheral surface of described cylinder body 7, have the exhaust port (14) that runs through wall thickness, exhaust port (14) is positioned on the cylindrical section between right piston (6) and push rod (16).
3. buffering as claimed in claim 1 or 2 is thrown venting cylinder, it is characterized in that, on the outer peripheral surface of described connector bar (12), has the exhaust port that runs through wall thickness, and exhaust port is positioned on the cylindrical section with seat (17) connecting end that rolls.
4. buffering as claimed in claim 3 is thrown venting cylinder, it is characterized in that the load end installed thrust bearing (22) of described screw rod (1) and left piston (4).
5. buffering as claimed in claim 4 is thrown venting cylinder, it is characterized in that, the position of the upper axial groove of described cylinder body (7) is provided with slide plate (20), and it is upper that slide plate (20) is fixedly mounted on by screw (18) seat (17) that rolls, and follows the seat (17) that rolls and is synchronized with the movement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753147.3A CN103758814B (en) | 2013-12-31 | 2013-12-31 | A kind of buffering throws venting cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753147.3A CN103758814B (en) | 2013-12-31 | 2013-12-31 | A kind of buffering throws venting cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103758814A true CN103758814A (en) | 2014-04-30 |
| CN103758814B CN103758814B (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310753147.3A Expired - Fee Related CN103758814B (en) | 2013-12-31 | 2013-12-31 | A kind of buffering throws venting cylinder |
Country Status (1)
| Country | Link |
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| CN (1) | CN103758814B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697453A (en) * | 2016-04-22 | 2016-06-22 | 浙江工业大学 | Air cylinder with liquid buffer device |
| CN106246635A (en) * | 2016-08-29 | 2016-12-21 | 湖州华和金属制品有限公司 | From pressure release piston rod |
| CN108035935A (en) * | 2017-12-24 | 2018-05-15 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of electrohydraulic actuator buffer piston pushing meanss |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1314490A (en) * | 1970-11-17 | 1973-04-26 | Alkan R & Cie | Retractable ejector devices |
| US6073441A (en) * | 1996-03-06 | 2000-06-13 | Pos-Line Ab | Single acting pneumatic piston-cylinder unit |
| RU2349516C1 (en) * | 2007-09-20 | 2009-03-20 | Федеральное государственное унитарное предприятие "Государственный космический научно-производственный центр имени М.В. Хруничева" | Thrust-pneumatic pusher |
| RU2406662C1 (en) * | 2009-09-14 | 2010-12-20 | Федеральное Государственное унитарное предприятие Государственный научно-производственный ракетно-космический центр (ФГУП ГНПРКЦ "ЦСКБ-Прогресс") | Device to separated and jettison launch vehicle nose cone |
| CN102908726A (en) * | 2012-10-05 | 2013-02-06 | 施胜南 | Thrower for rescuing |
-
2013
- 2013-12-31 CN CN201310753147.3A patent/CN103758814B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1314490A (en) * | 1970-11-17 | 1973-04-26 | Alkan R & Cie | Retractable ejector devices |
| US6073441A (en) * | 1996-03-06 | 2000-06-13 | Pos-Line Ab | Single acting pneumatic piston-cylinder unit |
| RU2349516C1 (en) * | 2007-09-20 | 2009-03-20 | Федеральное государственное унитарное предприятие "Государственный космический научно-производственный центр имени М.В. Хруничева" | Thrust-pneumatic pusher |
| RU2406662C1 (en) * | 2009-09-14 | 2010-12-20 | Федеральное Государственное унитарное предприятие Государственный научно-производственный ракетно-космический центр (ФГУП ГНПРКЦ "ЦСКБ-Прогресс") | Device to separated and jettison launch vehicle nose cone |
| CN102908726A (en) * | 2012-10-05 | 2013-02-06 | 施胜南 | Thrower for rescuing |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697453A (en) * | 2016-04-22 | 2016-06-22 | 浙江工业大学 | Air cylinder with liquid buffer device |
| CN106246635A (en) * | 2016-08-29 | 2016-12-21 | 湖州华和金属制品有限公司 | From pressure release piston rod |
| CN106246635B (en) * | 2016-08-29 | 2018-07-24 | 浙江品创知识产权服务有限公司 | From pressure release piston rod |
| CN108035935A (en) * | 2017-12-24 | 2018-05-15 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of electrohydraulic actuator buffer piston pushing meanss |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103758814B (en) | 2015-11-25 |
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