CN108033369B - Telescopic boom and crane comprising such a telescopic boom - Google Patents
Telescopic boom and crane comprising such a telescopic boom Download PDFInfo
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- CN108033369B CN108033369B CN201711223182.9A CN201711223182A CN108033369B CN 108033369 B CN108033369 B CN 108033369B CN 201711223182 A CN201711223182 A CN 201711223182A CN 108033369 B CN108033369 B CN 108033369B
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- cover plate
- lower cover
- telescopic boom
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- telescopic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
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- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a telescopic boom and a crane comprising the same. The telescopic arm comprises an upper cover plate and a lower cover plate connected to the upper cover plate to form a closed section, the lower cover plate comprises an outer lower cover plate and an inner lower cover plate connected with the outer lower cover plate, the outer lower cover plate and the inner lower cover plate are partially overlapped, the overlapped part is positioned in the middle area of the lower cover plate, and the fixed connection points of the outer lower cover plate and the inner lower cover plate are positioned at two ends of the overlapped part. The invention also discloses a crane comprising the telescopic boom. The telescopic boom and the crane middle lower cover plate comprising the telescopic boom are in an overlapped type, and meanwhile, the overlapped part of the lower cover plate is arranged in the high stress area in the middle section of the lower cover plate, so that the telescopic boom with a larger appearance can be manufactured, the bearing capacity of the telescopic boom is improved, and the bearing requirement of the telescopic boom is met.
Description
Technical Field
The invention relates to the technical field of industrial mechanical equipment, in particular to a telescopic boom and a crane comprising the same.
Background
Compared with a plurality of cranes with the same capacity, the telescopic boom crane has the disadvantages of higher manufacturing cost, large requirement on the installation site of the truss boom crane, heavier structure of the tower crane and inconvenient installation. One of the cranes is generally selected for use according to the place and use.
At present, the telescopic boom of a telescopic boom crane generally has four shapes and structures, and can be divided into a telescopic boom with a rectangular section, a telescopic boom with a polygonal section, a telescopic boom with a U-shaped section and a telescopic boom with a pear-shaped section according to the development and improvement processes of the telescopic boom. Fig. 6A, 6B, 6C, and 6D are schematic cross-sectional views illustrating a prior art telescopic arm provided as an example, and fig. 7 is a distribution diagram of a high stress region in the prior art telescopic arm shown in fig. 6, respectively. Fig. 6A shows a telescopic boom with a rectangular cross section, fig. 6B shows a telescopic boom with a polygonal cross section, fig. 6C shows a telescopic boom with a U-shaped cross section, and fig. 6D shows a telescopic boom with a pear-shaped cross section. At present, an upper cover plate and a lower cover plate are welded together to form a closed section, so that the stress characteristic of the section is improved, and the local stability of a steel plate is enhanced. When the telescopic arm is designed and manufactured, the upper cover plate and the lower cover plate are welded together usually at a point a, and at the moment, the welding seam is positioned near the neutral layer, so that the stress is lower. However, due to the limitation of the width of the steel plate, the telescopic boom with larger appearance can not be manufactured by the structural shape of the prior telescopic boom, especially the high-strength steel plate used by the super-tonnage telescopic boom crane. If a plurality of steel plates are used for butt joint, a butt weld generally falls in a high stress area or is close to the high stress area, and the bearing safety of the telescopic boom is greatly influenced by weld defects. In addition, after the section becomes large, when the telescopic boom is subjected to a bending action, local stress near the lowest point b of the lower cover plate is large, local instability is easily caused, and the bearing capacity of the telescopic boom is further limited.
Therefore, how to manufacture a telescopic arm with a larger external shape and meet the bearing requirements of the telescopic arm becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
To solve the above technical problems in the prior art, the present invention provides a telescopic boom having a larger profile and a high load-bearing capacity and a crane including the same.
Therefore, the invention discloses a telescopic arm. The telescopic boom comprises an upper cover plate and a lower cover plate connected to the upper cover plate to form a closed section, wherein the lower cover plate comprises an outer lower cover plate and an inner lower cover plate connected with the outer lower cover plate, the outer lower cover plate is partially overlapped with the inner lower cover plate, the overlapped part is positioned in the middle area of the lower cover plate, and the fixed connection points of the outer lower cover plate and the inner lower cover plate are positioned at two ends of the overlapped part.
Further, in the telescopic boom, the upper cover plate and the lower cover plate are fixedly connected by welding.
Further, in the telescopic boom, the welding seam position of the upper cover plate and the lower cover plate is located in a neutral layer area in the middle section of the closed section formed by the upper cover plate and the lower cover plate.
Further, in the telescopic boom, the outer lower cover plate and the inner lower cover plate are fixedly connected by welding.
Further, in the telescopic boom, the position of the weld of the outer lower cover plate and the inner lower cover plate is deviated from the lower cover plate middle section area.
Furthermore, in the telescopic arm, the gap of the overlapped part of the outer lower cover plate and the inner lower cover plate is L which is more than or equal to 0.
Further, in the telescopic arm, the outer lower cover plate is located at one of left and right sides of the lower cover plate, and the inner lower cover plate is located at the other side of the lower cover plate.
Further, in the telescopic arm, the upper cover plate is in an inverted U shape, a fold line shape, a semicircular shape or a semi-elliptic shape.
Further, in the telescopic boom, the outer lower cover plate in the lower cover plate is arc-shaped, elliptic arc-shaped, zigzag-shaped, arc-shaped with broken lines or elliptic arc-shaped with broken lines, and the inner lower cover plate is arc-shaped, elliptic arc-shaped, zigzag-shaped, arc-shaped with broken lines or elliptic arc-shaped with broken lines.
A crane is also disclosed. The crane comprises the telescopic arm.
According to the telescopic boom provided by the invention, the lower cover plate is designed to be overlapped, and meanwhile, the welding seam position of the lower cover plate is moved away from the high-stress area at the middle section of the lower cover plate, so that the telescopic boom with a larger appearance can be manufactured, the bearing capacity of the telescopic boom is improved, and the bearing requirement of the telescopic boom is met.
The lower cover plate formed by overlapping the outer lower cover plate and the inner lower cover plate is adopted, so that the overall dimension of the telescopic arm can be increased; on one hand, the overlapping part of the external lower cover plate and the internal lower cover plate is arranged in a high stress area in the middle section of the lower cover plate, and when the lower part of the telescopic boom bears, namely the high stress area in the middle of the lower cover plate bears, the external lower cover plate and the internal lower cover plate jointly act through the overlapping part, so that the local bearing capacity of the telescopic boom can be improved; on the other hand, the welding seam positions of the external lower cover plate and the internal lower cover plate are moved away from the high-stress area of the middle section area of the lower cover plate, and when the welding seam is used for bearing, the welding seam and the motherboard act together, so that the safety and the stability are good.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a cross-sectional view of a telescoping arm provided in accordance with one embodiment of the present invention;
FIG. 2 is a distribution diagram of high stress areas in the telescoping arm shown in FIG. 1;
fig. 3A, 3B, 3C, 3D, 3E, 3F and 3G are sectional views of the telescopic arm shown in fig. 1, in which the upper cover plate is different in shape;
fig. 4A, 4B, 4C and 4D are sectional views of the telescopic arm shown in fig. 1, in which the gap between the outer lower cover plate and the inner lower cover plate is zero, respectively, when the lower cover plates are different in shape;
fig. 5A, 5B, 5C and 5D are sectional views of the telescopic boom shown in fig. 1, in which the gap between the outer lower cover plate and the inner lower cover plate is greater than zero, respectively, and the lower cover plates are different in shape;
fig. 6A, 6B, 6C and 6D are schematic cross-sectional shape views of a prior art telescopic arm provided as an example, respectively;
fig. 7 is a distribution diagram of high stress areas in the prior art telescopic arm shown in fig. 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
Fig. 1 is a cross-sectional view of a telescopic arm according to an embodiment of the present invention. As shown in fig. 1, the telescopic boom of this embodiment includes an upper cover plate 1 and a lower cover plate 2 connected to the upper cover plate 1 to form a closed cross section, the lower cover plate 2 includes an outer lower cover plate 201 and an inner lower cover plate 202 connected to the outer lower cover plate 201, the outer lower cover plate 201 and the inner lower cover plate 202 are partially overlapped, the overlapped portion is located in the middle area of the lower cover plate 2, and the fixed connection points of the outer lower cover plate 201 and the inner lower cover plate 202 are located at both ends of the overlapped portion. The telescopic boom utilizes the outer lower cover plate 201 and the inner lower cover plate 202 to be connected in an overlapping mode, so that the overall dimension of the telescopic boom can be increased, and the bearing capacity of the telescopic boom can be improved. Wherein, upper cover plate 1 and lower cover plate 2 can pass through welded mode fixed connection. The outer lower cover plate 201 and the inner lower cover plate 202 may be fixedly connected by welding.
Fig. 2 is a distribution diagram of high stress areas in the telescopic arm shown in fig. 1. As shown in fig. 2, when the telescopic boom works, under normal conditions, the upper part of the telescopic boom bears the stretching effect, the lower part of the telescopic boom bears the bending effect, namely, the upper cover plate 1 of the telescopic boom bears the stretching effect, the lower cover plate 2 of the telescopic boom bears the bending effect, high stress areas are respectively distributed on the upper section and the lower section of the closed section of the telescopic boom at the moment, and neutral layers are arranged at the middle positions of two sides of the closed section of the telescopic boom. Preferably, the welding points and the welding seam positions of the upper cover plate 1 and the lower cover plate 2 are arranged on the neutral layer and the vicinity of the middle section of the closed section formed by the upper cover plate 1 and the lower cover plate 2, the stress is small, and the bearing capacity of the telescopic arm can be improved.
Further, the welding points and the welding line positions of the outer lower cover plate 201 and the inner lower cover plate 202 are arranged at two ends of the overlapped part of the outer lower cover plate 201 and the inner lower cover plate 202, so that the welding line position deviates from a high-stress area in the middle section of the lower cover plate 2, the bearing capacity of the telescopic arm can be improved, and when the welding line is borne nearby, the welding line and the mother plate can act together, and the safety and the stability of equipment are improved. Meanwhile, the overlapping part of the outer lower cover plate 201 and the inner lower cover plate 202 is arranged in the high stress area of the lower cover plate 2, and when the high stress area at the lower part of the telescopic arm bears, the outer lower cover plate 201 and the inner lower cover plate 202 jointly act through the overlapping part, so that the local bearing capacity of the telescopic arm is improved.
Fig. 3A, 3B, 3C, 3D, 3E, 3F, and 3G are sectional views of the telescopic arm shown in fig. 1 in which the upper cover plate is different in shape. As shown in fig. 3A, 3B, 3C, 3D, 3E, 3F, and 3G, the telescopic arm upper cover 1 may have various shapes and structures according to the place of use and the work requirement of the telescopic arm. Wherein, the upper cover plate 1 shown in fig. 3A is in an inverted U shape with the same upper and lower width; the upper cover plate 1 shown in fig. 3B is in an inverted U shape with a wide upper part and a narrow lower part; the upper cover plate 1 shown in fig. 3C is in an inverted U shape with a narrow top and a wide bottom; the upper cover plate 1 shown in fig. 3D is a multi-segment fold line shape with the middle part protruding upwards, wherein the fold line can be replaced by a circular arc line; the upper cover plate 1 shown in fig. 3E is a multi-segment broken line shape with a straight middle part, wherein the broken line can be replaced by an arc line; the upper cover plate 1 shown in fig. 3F is semicircular; the upper cover plate 1 shown in fig. 3G has a semi-elliptical shape. Specifically, a suitable shape structure of the upper cover plate 1 may be selected according to performance requirements of the telescopic boom in practical application, for example, when the telescopic boom is required to meet the requirement of smaller stress and deformation under the same bearing condition, the upper cover plate 1 may adopt a shape structure tending to approximate to a "U" shape; when the telescopic arm is required to meet the requirements of lighter weight and better structural stability under the same bearing condition, the upper cover plate 1 can adopt a shape structure which tends to be similar to an arc shape or an elliptic arc shape.
Fig. 4A, 4B, 4C and 4D are sectional views of the telescopic arm shown in fig. 1, in which the lower cover plate has different shapes, and the gap between the outer lower cover plate and the inner lower cover plate is zero. As shown in fig. 4A, 4B, 4C, and 4D, the telescopic arm lower cover 2 connected to the telescopic arm upper cover 1 to form a closed cross section may have various shapes and structures according to the place of use and the work requirement of the telescopic arm. Wherein, the lower cover plate 2 shown in fig. 4A is semicircular, wherein the outer lower cover plate 201 and the inner lower cover plate 202 are both arc-shaped; fig. 4B shows the lower cover 2 as a semi-elliptical shape, in which the outer lower cover 201 and the inner lower cover 202 are both elliptical arcs; fig. 4C shows that the lower cover plate 2 has a multi-segment fold line shape, in which the outer lower cover plate 201 and the inner lower cover plate 202 are both multi-segment fold lines; the lower cover plate 2 shown in fig. 4D is a folding line plus an arc shape or a folding line plus an elliptic arc shape, wherein the outer lower cover plate 201 and the inner lower cover plate 202 may be both a folding line plus an arc shape or both a folding line plus an elliptic arc shape. Similarly, a proper shape structure of the lower cover plate 2 can be selected according to the performance requirements of the telescopic boom in practical application, for example, when the telescopic boom is required to meet the requirement of smaller stress and deformation under the same bearing condition, the lower cover plate 2 can adopt a shape structure tending to approximate to a 'U' shape; when the telescopic arm is required to meet the requirements of lighter weight and better structural stability under the same bearing condition, the lower cover plate 2 can adopt a shape structure which tends to be similar to a circular arc or an elliptic arc.
Fig. 5A, 5B, 5C and 5D are sectional views of the telescopic arm shown in fig. 1, in which the gap between the outer lower cover and the inner lower cover is greater than zero. As shown in fig. 5A, 5B, 5C, and 5D, in the lower cover 2 of the telescopic arm, the gap at the overlapping portion of the outer lower cover 201 and the inner lower cover 202 may be greater than zero. Wherein, the lower cover plate 2 shown in fig. 5A is semicircular, wherein the outer lower cover plate 201 and the inner lower cover plate 202 are both arc-shaped; fig. 5B shows the lower cover 2 as a semi-elliptical shape, in which the outer lower cover 201 and the inner lower cover 202 are both elliptical arcs; fig. 5C shows that the lower cover plate 2 has a multi-segment fold line shape, in which the outer lower cover plate 201 and the inner lower cover plate 202 are both multi-segment fold lines; the lower cover plate 2 shown in fig. 5D is a folding line plus an arc shape or a folding line plus an elliptic arc shape, wherein the outer lower cover plate 201 and the inner lower cover plate 202 may be both a folding line plus an arc shape or both a folding line plus an elliptic arc shape. Specifically, the gap of the overlapped portion of the outer lower cover plate 201 and the inner lower cover plate 202 and the shape structure of the lower cover plate 2 can be selected as appropriate according to the requirements on the external dimension and the bearing capacity of the telescopic arm.
In summary, the gap between the overlapped portion of the outer lower cover plate 201 and the inner lower cover plate 202 is L, where L is greater than or equal to 0.
Further, in the telescopic-arm lower cover 2, the outer lower cover 201 may be disposed on the left side of the lower cover 2, and correspondingly, the inner lower cover 202 is disposed on the right side of the lower cover 2; conversely, the outer lower cover 201 may be disposed on the right side of the lower cover 2, and correspondingly, the inner lower cover 202 may be disposed on the left side of the lower cover 2. Therefore, the left-right positional relationship of the outer lower cover 201 and the inner lower cover 202 may be the positional relationship shown in fig. 4A to 4D and fig. 5A to 5D, or may be the positional relationship after the left-right positions of the outer lower cover 201 and the inner lower cover 202 are exchanged as shown in fig. 4A to 4D and fig. 5A to 5D.
In addition to the shapes of the lower cover plates of the above-mentioned embodiments, according to actual needs, the outer lower cover plate 201 of any one of the above-mentioned various forms of the outer lower cover plate 201 and the inner lower cover plate 202 of any one of the above-mentioned various forms of the inner lower cover plate 202 may be cooperatively connected with each other to form the lower cover plate 2, and it can be seen that the outer lower cover plate 201 and the inner lower cover plate 202 of the lower cover plate 2 may be in a non-bilaterally symmetrical shape, for example, the outer lower cover plate 201 in the lower cover plate 2 is in a multi-segment zigzag shape and the inner lower cover plate 202 is in an. The upper cover plate 1 in any one of the above-mentioned various forms of upper cover plate 1 and the lower cover plate 2 in any one of the above-mentioned various forms of lower cover plate 2 can be mutually matched and connected to form a telescopic arm.
The telescopic arm with the section scheme can be used for a multi-section telescopic arm formed by an oil cylinder and the telescopic arm and can also be used for a single-cylinder pin-plugging multi-section telescopic arm. In the case of using the existing steel plate with a limited width, the section size can be larger; meanwhile, the lower cover plate 2 formed by overlapping the outer lower cover plate 201 and the inner lower cover plate 202 can improve the bearing capacity of a high-stress area of the telescopic boom, the bearing performance of the telescopic boom can be fully exerted, and the telescopic boom has good effects of reducing the thickness of a high-strength plate of the telescopic boom and improving the local stability of the telescopic boom.
The crane provided by one embodiment of the invention comprises the telescopic arm. Preferably, the telescopic boom is particularly suitable for a super-tonnage telescopic boom crane.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A telescopic boom comprises an upper cover plate and a lower cover plate connected to the upper cover plate to form a closed section, and is characterized in that the lower cover plate comprises an outer lower cover plate and an inner lower cover plate connected with the outer lower cover plate;
the outer lower cover plate and the inner lower cover plate are partially overlapped, and the overlapped part is positioned in the middle area of the lower cover plate;
the fixed connection points of the external lower cover plate and the internal lower cover plate are positioned at two ends of the overlapped part;
the upper cover plate and the lower cover plate are fixedly connected in a welding mode, and the welding seam position of the upper cover plate and the lower cover plate is located in a neutral layer area in the middle section of a closed section formed by the upper cover plate and the lower cover plate;
the outer lower cover plate is positioned on one of the left side and the right side of the lower cover plate, and the inner lower cover plate is positioned on the other side of the lower cover plate.
2. The telescopic arm according to claim 1, wherein said outer lower cover plate and said inner lower cover plate are fixedly connected by welding.
3. The telescopic arm according to claim 2, wherein the weld locations of the outer and inner lower cover plates are offset from the lower cover plate mid-section area.
4. The telescopic boom of claim 1, wherein the gap at the overlapping portion of the outer lower cover plate and the inner lower cover plate is L, wherein L is greater than or equal to 0.
5. The telescopic arm according to claim 1, wherein the upper cover plate is an inverted "U" shape, a dog-leg shape, a semi-circle shape or a semi-ellipse shape.
6. The telescopic boom of claim 1, wherein the outer lower cover plate of the lower cover plate is circular arc-shaped, elliptical arc-shaped, dog-leg shaped, broken line plus circular arc-shaped, or broken line plus elliptical arc-shaped, and the inner lower cover plate is circular arc-shaped, elliptical arc-shaped, dog-leg shaped, broken line plus circular arc-shaped, or broken line plus elliptical arc-shaped.
7. A crane, comprising a telescopic boom according to any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711223182.9A CN108033369B (en) | 2017-11-29 | 2017-11-29 | Telescopic boom and crane comprising such a telescopic boom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711223182.9A CN108033369B (en) | 2017-11-29 | 2017-11-29 | Telescopic boom and crane comprising such a telescopic boom |
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| Publication Number | Publication Date |
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| CN108033369A CN108033369A (en) | 2018-05-15 |
| CN108033369B true CN108033369B (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711223182.9A Active CN108033369B (en) | 2017-11-29 | 2017-11-29 | Telescopic boom and crane comprising such a telescopic boom |
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| CN (1) | CN108033369B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201800007213A1 (en) * | 2018-07-16 | 2020-01-16 | Carlo Rosso | TELESCOPIC ARM AND SELF-PROPELLED VEHICLE EQUIPPED WITH THIS ARM |
| EP3722246B1 (en) * | 2019-04-08 | 2024-09-18 | Hiab AB | Telescopic crane boom section, telescopically extensible crane boom and hydraulic crane |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19549268C1 (en) * | 1995-12-28 | 1997-07-31 | Mannesmann Ag | Carrier in box construction, in particular crane boom or telescopic boom and method for producing a carrier |
| DE19948830B4 (en) * | 1999-10-06 | 2005-11-24 | Terex-Demag Gmbh & Co. Kg | Telescopic boom for cranes |
| JP2004149268A (en) * | 2002-10-31 | 2004-05-27 | Tadano Ltd | Boom section for telescopic boom |
| CN201301181Y (en) * | 2008-12-01 | 2009-09-02 | 三一汽车制造有限公司 | Retractable jib |
| CN202963857U (en) * | 2012-12-04 | 2013-06-05 | 中联重科股份有限公司 | Crane arm assembling device |
| CN103287994B (en) * | 2013-05-21 | 2016-04-06 | 三一汽车起重机械有限公司 | Arm cylinder and construction machinery and equipment |
| CN205076723U (en) * | 2015-10-13 | 2016-03-09 | 姚运文 | Light -duty jib loading boom is not snapped to high strength |
| CN205241112U (en) * | 2015-12-23 | 2016-05-18 | 河南九一重工有限公司 | Jib loading boom arm head device |
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2017
- 2017-11-29 CN CN201711223182.9A patent/CN108033369B/en active Active
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| CN108033369A (en) | 2018-05-15 |
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