CN108502701B - Single-side internally inserted safety lifting hook for rigid pipe - Google Patents
Single-side internally inserted safety lifting hook for rigid pipe Download PDFInfo
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- CN108502701B CN108502701B CN201810634257.0A CN201810634257A CN108502701B CN 108502701 B CN108502701 B CN 108502701B CN 201810634257 A CN201810634257 A CN 201810634257A CN 108502701 B CN108502701 B CN 108502701B
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- 238000000034 method Methods 0.000 abstract description 28
- 238000010586 diagram Methods 0.000 description 11
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention relates to the technical field of lifting hook devices, in particular to a single-side internally-inserted type safety lifting hook for rigid pipes, which is used for solving the problems of low lifting efficiency, easiness in damaging the pipes and inconvenience in splicing the subsequent pipes in a pipe lifting method in the prior art.
Description
Technical Field
The invention relates to the technical field of lifting hook devices, in particular to a single-side internally-inserted safety lifting hook for a rigid pipe.
Background
In the hook-hanging transportation of the pipe, the main method in the prior art is binding type lifting transportation or internal penetrating type lifting transportation that a lifting rope penetrates into the pipe, but the two lifting transportation methods have different technical defects: the binding type hoisting method is not beneficial to balance, the construction efficiency is affected due to inconvenient binding of the hoisting ropes during construction, the linearity and the direction of the pipeline are disturbed when the hoisting ropes are disassembled after the pipeline is in place, and the phenomenon is easy to occur particularly when the pipeline is installed on a concrete foundation; the internal-penetrating type hoisting mode is unfavorable for protecting the pipe orifice, is easy to cause the damage of the pipe orifice caused by stress concentration at the contact position of the lifting rope and the pipe, is unfavorable for splicing the pipe, and needs to drop down firstly to take out the lifting rope and then use other equipment for pipe interface connection during splicing, so that the construction efficiency is seriously influenced.
In summary, the pipe lifting method in the prior art has the problems of low lifting efficiency, easy damage to the pipe and inconvenience in subsequent pipe splicing.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a single-side internally-inserted safety lifting hook for rigid pipes, so as to solve the problems of low lifting efficiency, easiness in damaging the pipes and inconvenience in subsequent pipe splicing in the pipe lifting method in the prior art.
In order to solve the problems, the invention provides the following technical scheme:
a single-side internally inserted safety lifting hook for a rigid pipe comprises a main framework and an auxiliary lifting appliance;
The main framework is provided with a first contact surface and a second contact surface, and the first contact surface is abutted against the upper surface of the first end of the pipe; the second contact surface is abutted against the inner surface of the pipe, a space for accommodating the pipe is formed between the first contact surface and the second contact surface, and a longitudinal limit is formed;
one end of the auxiliary lifting appliance is fixed on the main framework, and the other end of the auxiliary lifting appliance is detachably connected with the second end of the pipe;
The first end and the second end are two ends of the pipe in the length direction.
Still further, the method comprises the steps of,
The main framework comprises a main framework body, a telescopic rod and an inner supporting plate;
the main skeleton body with telescopic link swing joint, interior layer board with the telescopic link is articulated, just the upper surface of interior layer board forms the second contact surface.
Still further, the method comprises the steps of,
The telescopic rod comprises a first diameter section and a second diameter section, and the first diameter section and the second diameter section are vertically arranged;
The first diameter section is used for being movably connected with the main framework body, the length of the first diameter section extending into the main framework body can be adjusted, and the second diameter section is used for being hinged with the inner supporting plate.
Still further, the method comprises the steps of,
The second diameter section and the inner supporting plate are hinged and installed, an installation gap is formed between the second diameter section and the inner supporting plate, and the inner supporting plate can rotate around a hinge shaft in the installation gap.
Still further, the method comprises the steps of,
The upper surface of the inner supporting plate is provided with a rubber pad.
Still further, the method comprises the steps of,
The main framework body comprises a first section, a second section, a third section and a fourth section which are sequentially connected end to end;
the first section is obliquely arranged, an included angle is formed between the first section and the second section, and a hanging ring is arranged at the top of the first section;
the second section is horizontally arranged, and the lower surface of the second section is a first contact surface;
The third section is perpendicular to the second section;
The fourth section is connected with the end part of the third section, which is away from the second section;
A U-shaped opening is formed between the second section, the third section and the fourth section.
Still further, the method comprises the steps of,
The lower surface of the second section is provided with a rubber pad.
Still further, the method comprises the steps of,
The inner side of the third section is provided with a rubber pad, and the third section and the auxiliary lifting appliance are respectively abutted against two ends of the pipe to form a transverse limit.
Still further, the method comprises the steps of,
The fourth section is provided with a plurality of pin holes for positioning the telescopic rod along the extending direction of the telescopic rod.
Still further, the method comprises the steps of,
The auxiliary lifting appliance comprises a hook and a lifting rope, wherein the lifting rope is detachably connected with the first section, and the hook is arranged at the tail end of the lifting rope.
By combining the technical scheme, the beneficial effects brought by the invention are analyzed as follows:
a single-side internally inserted safety lifting hook for a rigid pipe comprises a main framework and an auxiliary lifting appliance;
The main framework is provided with a first contact surface and a second contact surface, and the first contact surface is abutted against the upper surface of the first end of the pipe; the second contact surface is abutted against the inner surface of the pipe, a space for accommodating the pipe is formed between the first contact surface and the second contact surface, and a longitudinal limit is formed;
one end of the auxiliary lifting appliance is fixed on the main framework, and the other end of the auxiliary lifting appliance is detachably connected with the second end of the pipe;
The first end and the second end are two ends of the pipe in the length direction.
When the pipe lifting device is used, the pipe is firstly inserted into the pipe from a single side, the first contact surface is abutted against the upper surface of the pipe insertion side, the second contact surface is abutted against the inner surface of the pipe, the problem that when the pipe is lifted by the traditional method, stress concentration at the contact position of a lifting rope and the pipe causes damage to the pipe is avoided, a space for accommodating the pipe is formed between the first contact surface and the second contact surface, longitudinal limit is formed, one end of an auxiliary lifting appliance is fixed on a main framework, the other end of the auxiliary lifting appliance is detachably connected with the non-insertion side of the pipe, the auxiliary lifting appliance and the main framework form transverse limit, the stability of the pipe in the lifting process is commonly maintained, the repeated binding and unbinding of the lifting rope are not needed like the pipe lifting method in the prior art, the lifting efficiency is high, the pipe is inserted from the single side, the subsequent pipe splicing is not influenced, the pipe splicing can be directly completed in the pipe lowering process, and the construction efficiency is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a single-sided internal inserted safety hook for rigid pipes according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation of the rigid pipe single-side internal safety hook lifting pipe according to the embodiment of the invention;
fig. 3 is a schematic structural diagram of a telescopic rod according to an embodiment of the present invention.
Icon: 100-a main framework; 110-a main skeleton body; 111-first section; 112-a second section; 113-a third section; 114-fourth stage; 1121-a first contact surface; 120-telescoping rod; 121-a first diameter section; 122-a second diameter section; 130-an inner pallet; 131-a second contact surface; 132-mounting gap; 200-auxiliary lifting appliance; 210-hooking; 220-lifting ropes.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Embodiment 1 is described in detail below with reference to the accompanying drawings:
Example 1
A single-side inserted safety lifting hook for rigid pipes comprises a main framework 100 and an auxiliary lifting appliance 200;
the main framework 100 is provided with a first contact surface 1121 and a second contact surface 131, and the first contact surface 1121 is abutted against the upper surface of the first end of the pipe; the second contact surface 131 is abutted against the inner surface of the pipe, and a space for accommodating the pipe is formed between the first contact surface 1121 and the second contact surface 131 and a longitudinal limit is formed;
One end of the auxiliary lifting appliance 200 is fixed on the main framework 100, and the other end of the auxiliary lifting appliance is detachably connected with the second end of the pipe;
The first end and the second end are two ends of the pipe along the length direction.
The overall structure schematic diagram of the single-side inserted safety hook for rigid pipes provided by the embodiment of the invention in fig. 1 and the working schematic diagram of the lifting pipe for the single-side inserted safety hook for rigid pipes provided by the embodiment of the invention in fig. 2 are shown as follows:
When the lifting device is used, firstly, the product is inserted into a pipe from a single side, the first contact surface 1121 is abutted against the upper surface of the pipe insertion side, the second contact surface 131 is abutted against the inner surface of the pipe, the problem that when the pipe is lifted by a traditional method, stress concentration at the contact position of the lifting rope 220 and the pipe causes damage to the pipe is avoided, a space for accommodating the pipe is formed between the first contact surface 1121 and the second contact surface 131, longitudinal limit is formed, one end of the auxiliary lifting device 200 is fixed on the main framework 100, the other end of the auxiliary lifting device is detachably connected with the non-insertion side of the pipe, the auxiliary lifting device 200 and the main framework 100 form transverse limit, the stability of the pipe in the lifting process is commonly maintained, the lifting rope 220 is not required to be repeatedly bound and unbound by the pipe lifting method like the prior art, the lifting efficiency is high, and the pipe splicing can be directly completed when the pipe is lowered due to the fact that the pipe is inserted from the single side, the subsequent pipe splicing is not influenced, and the construction efficiency is improved.
In the alternative to this embodiment, the first and second embodiments, preferably,
The main frame 100 includes a main frame body 110, a telescopic link 120, and an inner pallet 130;
the main skeleton body 110 is movably connected with the telescopic rod 120, the inner supporting plate 130 is hinged with the telescopic rod 120, and a second contact surface 131 is formed on the upper surface of the inner supporting plate 130.
As shown in the schematic overall structure of the single-side inserted safety hook for rigid pipes provided in the embodiment of the invention in fig. 1:
The main skeleton body 110 is movably connected with the telescopic rod 120, the inner supporting plate 130 is hinged with the telescopic rod 120, and the second contact surface 131 is formed on the upper surface of the inner supporting plate 130, so that the telescopic rod 120 can adjust the telescopic length along the main skeleton body 110 when the pipes with different lengths are lifted, the second contact surface 131 on the upper surface of the inner supporting plate 130 can be contacted with the center of the inner wall of the pipe, and the stability in the lifting process is improved.
In the alternative to this embodiment, the first and second embodiments, preferably,
The telescopic rod 120 comprises a first diameter section 121 and a second diameter section 122, and the first diameter section 121 and the second diameter section 122 are vertically arranged;
the first diameter section 121 is used for movably connecting the main skeleton body 110, and can adjust the length extending into the main skeleton body 110, and the second diameter section 122 is used for hinging the inner supporting plate 130.
As shown in the schematic structural diagram of the telescopic rod 120 provided in the embodiment of the present invention in fig. 3:
The telescopic rod 120 comprises a first diameter section 121 and a second diameter section 122, and the second diameter section 122 mainly bears the vertical downward gravity of the pipe in the lifting process, so that the second diameter section 122 is vertically downward and is vertically arranged with the first diameter section 121, and the first diameter section 121 adjusts the length of the telescopic rod extending into the main framework body 110, so that the telescopic rod can lift pipes with different lengths.
In the alternative to this embodiment, the first and second embodiments, preferably,
The second diameter section 122 and the inner support plate 130 are hingedly mounted with a mounting gap 132, and the inner support plate 130 is rotatable within the mounting gap 132 about a hinge axis.
As shown in the schematic structural diagram of the telescopic rod 120 provided in the embodiment of the present invention in fig. 3:
The mounting gap 132 can enable the inner support plate 130 to rotate slightly therein, so that a balance point is easy to find when the pipe is inserted, and besides, when the wall thickness of the inserted pipe is thicker than the distance between the first contact surface 1121 and the second contact surface 131, the inner support plate 130 can also be inserted into the pipe in a slightly inclined manner after rotating slightly, so that the applicability of the product of the invention is improved.
In the alternative to this embodiment, the first and second embodiments, preferably,
The upper surface of the inner tray 130 is provided with a rubber pad.
The design is in order to make the inner supporting plate 130 when bearing tubular product inner wall, the rubber pad is pressed deformation, increase and tubular product arc inner wall's area of contact, reduce stress concentration, in addition, the rubber pad can also increase with tubular product inner wall's frictional force, restriction tubular product lateral shifting in the lifting by crane the in-process, improves the stability of lifting by crane the in-process.
In the alternative to this embodiment, the first and second embodiments, preferably,
The main skeleton body 110 includes a first section 111, a second section 112, a third section 113, and a fourth section 114 connected end to end in sequence;
the first section 111 is obliquely arranged, an included angle is formed between the first section and the second section 112, and a hanging ring is arranged at the top of the first section;
a second section 112, which is horizontally disposed and has a lower surface that is a first contact surface 1121;
a third section 113 perpendicular to the second section 112;
A fourth segment 114 connected to an end of the third segment 113 facing away from the second segment 112;
a U-shaped opening is formed between the second, third and fourth sections 112, 113 and 114.
As shown in a working schematic diagram of a rigid pipe single-side inserted safety hook lifting pipe provided by the embodiment of the invention in fig. 2, the working schematic diagram is as follows:
the first section 111, the second section 112, the third section 113 and the fourth section 114 are sequentially connected end to form the main skeleton body 110, and the second section 112, the third section 113 and the fourth section 114 form a U-shaped opening for inserting a pipe material containing pipe wall.
In the alternative to this embodiment, the first and second embodiments, preferably,
The lower surface of the second section 112 is provided with a rubber pad.
The design is in order to lift by crane the tubular product when the rubber pad is pressed deformation, increase and tubular product outer wall area of contact reduces stress concentration, protect tubular product tip, in addition, the rubber pad can also increase with the frictional force of tubular product outer wall, restriction tubular product lateral shifting in the process of lifting by crane, improves the stability of lifting by crane the process.
In the alternative to this embodiment, the first and second embodiments, preferably,
The inner side of the third section 113 is provided with a rubber pad, and the third section 113 and the auxiliary lifting appliance 200 are respectively abutted against two ends of the pipe to form transverse limit.
The inner side of the third section 113 is provided with the end face of the rubber pad abutting against the pipe during lifting, when the end face of the pipe is provided with a special device, such as a splicing connecting device, the rubber pad can be prevented from being in direct contact with the main framework body 110 during lifting, and protection of the end face of the pipe is improved.
In the alternative to this embodiment, the first and second embodiments, preferably,
The fourth section 114 is provided with a plurality of pin holes for positioning the telescopic link 120 in the extending direction of the telescopic link 120.
The pin holes are used for installing positioning pins, when the pipes with different lengths are lifted, the lengths of the telescopic rods 120 extending into the main framework body 110 are adjusted to adapt to the pipes with different lengths, and the positioning pins are inserted into the pin holes after adjustment, so that the telescopic rods 120 are fixed.
In the alternative to this embodiment, the first and second embodiments, preferably,
The auxiliary sling 200 comprises a hanger 210 and a sling 220, the sling 220 being detachably connected to the first section 111, the hanger 210 being arranged at the end of the sling 220.
As shown in a working schematic diagram of a rigid pipe single-side inserted safety hook lifting pipe provided by the embodiment of the invention in fig. 2, the working schematic diagram is as follows:
When the auxiliary lifting appliance 200 lifts, the main framework 100 is connected with the non-insertion end face of the pipe, and the non-insertion end face and the main framework 100 form transverse limit for the pipe, besides, when the pipe is spliced, the hook 210 is only required to be taken down, so that the pipe lifting appliance is convenient and quick.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The single-side internally-inserted safety lifting hook for the rigid pipe is characterized by comprising a main framework (100) and an auxiliary lifting appliance (200);
the main framework is provided with a first contact surface (1121) and a second contact surface (131), and the first contact surface is abutted against the upper surface of the first end of the pipe; the second contact surface is abutted against the inner surface of the pipe, a space for accommodating the pipe is formed between the first contact surface and the second contact surface, and a longitudinal limit is formed;
one end of the auxiliary lifting appliance is fixed on the main framework, and the other end of the auxiliary lifting appliance is detachably connected with the second end of the pipe;
The first end and the second end are two ends of the pipe in the length direction;
the main framework (100) comprises a main framework body (110), a telescopic rod (120) and an inner supporting plate (130);
the main framework body (110) is movably connected with the telescopic rod (120), the inner supporting plate (130) is hinged with the telescopic rod (120), and the second contact surface (131) is formed on the upper surface of the inner supporting plate (130);
the telescopic rod (120) comprises a first diameter section (121) and a second diameter section (122), and the first diameter section (121) and the second diameter section (122) are vertically arranged;
The first diameter section (121) is used for movably connecting the main framework body (110) and can adjust the length of the main framework body (110), and the second diameter section (122) is used for hinging the inner supporting plate (130);
the main framework body (110) comprises a first section (111), a second section (112), a third section (113) and a fourth section (114) which are sequentially connected end to end;
The first section (111) is obliquely arranged, an included angle is formed between the first section and the second section (112), and a hanging ring is arranged at the top of the first section;
The second section (112) is horizontally arranged, and the lower surface of the second section is a first contact surface (1121);
The third section (113) is perpendicular to the second section (112);
-said fourth segment (114) being connected to an end of said third segment (113) facing away from said second segment (112);
-a U-shaped opening is formed between the second section (112), the third section (113) and the fourth section (114).
2. The rigid tubing unilateral interpolation safety hook of claim 1, wherein:
the second diameter section (122) and the inner supporting plate (130) are hinged and provided with a mounting gap (132), and the inner supporting plate (130) can rotate around a hinge shaft in the mounting gap (132).
3. The rigid tubing unilateral add-in safety hook of claim 2, wherein:
The upper surface of the inner supporting plate (130) is provided with a rubber pad.
4. The rigid tubing unilateral interpolation safety hook of claim 1, wherein:
the lower surface of the second section (112) is provided with a rubber pad.
5. The rigid tubing unilateral add-in safety hook of claim 4, wherein:
the inner side of the third section (113) is provided with a rubber pad, and the third section (113) and the auxiliary lifting tool (200) are respectively abutted against two ends of the pipe to form transverse limiting.
6. The rigid tubing unilateral add-in safety hook of claim 5, wherein:
The fourth section (114) is provided with a plurality of pin holes for positioning the telescopic rod (120) along the extension direction of the telescopic rod (120).
7. The rigid tubing unilateral add-in safety hook of claim 6, wherein:
The auxiliary lifting appliance (200) comprises a hook (210) and a lifting rope (220), wherein the lifting rope (220) is detachably connected with the first section (111), and the hook (210) is arranged at the tail end of the lifting rope (220).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810634257.0A CN108502701B (en) | 2018-06-19 | 2018-06-19 | Single-side internally inserted safety lifting hook for rigid pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810634257.0A CN108502701B (en) | 2018-06-19 | 2018-06-19 | Single-side internally inserted safety lifting hook for rigid pipe |
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| Publication Number | Publication Date |
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| CN108502701A CN108502701A (en) | 2018-09-07 |
| CN108502701B true CN108502701B (en) | 2024-05-14 |
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| CN109371895A (en) * | 2018-11-12 | 2019-02-22 | 交通运输部天津水运工程科学研究所 | It is a kind of for increasing the pitch non-slip mat of coefficient of friction |
| CN110217695A (en) * | 2019-06-21 | 2019-09-10 | 神华包神铁路集团有限责任公司 | Locomotive gib head Hoisting Security device and locomotive gib head assembly and disassembly methods |
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| CN104760880A (en) * | 2015-02-06 | 2015-07-08 | 佛山宝钢不锈钢贸易有限公司 | Hook slide-prevention mechanism |
| CN205241052U (en) * | 2015-12-31 | 2016-05-18 | 河北建设集团有限公司 | Hoist and mount pipeline component |
| CN206051284U (en) * | 2016-08-29 | 2017-03-29 | 中国建筑第六工程局有限公司 | A kind of instrument for lifting concrete reinforced pipe |
| KR20180001503U (en) * | 2016-11-11 | 2018-05-21 | 삼성중공업 주식회사 | Carrying apparatus |
| CN206654649U (en) * | 2017-04-26 | 2017-11-21 | 中国葛洲坝集团第五工程有限公司 | A kind of simply adjustable shaped steel lifting card construction equipment |
| CN107311028A (en) * | 2017-06-26 | 2017-11-03 | 中石化石油工程技术服务有限公司 | A kind of pipe of concrete suspender and its method for production |
| CN206872275U (en) * | 2017-06-29 | 2018-01-12 | 徐工集团工程机械股份有限公司 | A kind of suspender of quick assembling eccentric block |
| CN208394605U (en) * | 2018-06-19 | 2019-01-18 | 中交一公局海威工程建设有限公司 | Rigid tubing unilateral side interpolation type safety hook |
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| CN108502701A (en) | 2018-09-07 |
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