CN113279793A - Temporary supporting device for roadway - Google Patents
Temporary supporting device for roadway Download PDFInfo
- Publication number
- CN113279793A CN113279793A CN202110776506.1A CN202110776506A CN113279793A CN 113279793 A CN113279793 A CN 113279793A CN 202110776506 A CN202110776506 A CN 202110776506A CN 113279793 A CN113279793 A CN 113279793A
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- support
- roadway
- supporting
- temporary
- rod
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- 238000000034 method Methods 0.000 description 13
- 238000005065 mining Methods 0.000 description 12
- 239000003245 coal Substances 0.000 description 7
- 239000002699 waste material Substances 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D19/00—Provisional protective covers for working space
- E21D19/02—Provisional protective covers for working space for use in longwall working
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The utility model provides a temporary supporting device in tunnel, this temporary supporting device in tunnel includes: door-type support, side keep off and side keeps off support piece. The door type support comprises a first support rod, a second support rod and a top beam, wherein two ends of the top beam are respectively connected with the end parts of the first support rod and the second support rod on the same side; the side block is arranged on one side of the first supporting rod, which is far away from the second supporting rod; one end of the side baffle supporting piece is connected with the top beam, the other end of the side baffle supporting piece is connected with the side baffle, and the side baffle supporting piece is used for providing lateral supporting force for the side baffle. The utility model provides a tunnel temporary support device can carry out temporary support to the tunnel, has improved the stability and the safety in becoming the tunnel certainly.
Description
Technical Field
The utility model relates to a mining technology field particularly, relates to a tunnel temporary support device.
Background
At present, in the longwall mining process, two tunnels need to be tunneled in advance for mining one working face, and one coal pillar needs to be reserved, the coal mining method not only causes resource waste due to the reserved coal pillar, but also causes certain threat to the stability of the tunnels due to the influence of mine pressure in the mining process of the reserved coal pillar, so a new mining method needs to be adopted, namely an N00 method is adopted, and in the mining process of an N00 method, the tunnels do not need to be tunneled in advance for mining one working face, and the coal pillar does not need to be reserved.
By adopting the N00 construction method, the roadway is formed in the working face mining process, because one side of the roadway is not provided with a coal pillar, after the working face mining, one side of the roadway is a goaf, the goaf formed by the caving of the top plate of the working face can be stabilized for a period of time, and the stability of the roadway after mining needs to be ensured.
However, the stability of the roadway is not sufficiently maintained only by conventional bolt and cable supports, so temporary supports are also needed to prevent goaf gangue from entering the roadway. And after the roadway is stabilized, removing the temporary support.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the disclosed embodiment is to provide a temporary supporting device for a roadway, which can temporarily support the roadway and improve the stability and safety of the roadway.
According to an aspect of the embodiments of the present disclosure, there is provided a roadway temporary support device, including:
the door type support comprises a first support rod, a second support rod and a top beam, wherein two ends of the top beam are respectively connected with the end parts of the first support rod and the second support rod on the same side;
the side block is arranged on one side, far away from the second supporting rod, of the first supporting rod;
and one end of the side baffle supporting piece is connected with the top beam, the other end of the side baffle supporting piece is connected with the side baffle, and the side baffle supporting piece is used for providing lateral supporting force for the side baffle.
In an exemplary embodiment of the present disclosure, the first support bar is a first hydraulic column, and the second support bar is a second hydraulic column.
In an exemplary embodiment of the present disclosure, the operating resistance of the first hydraulic strut is greater than the operating resistance of the second hydraulic strut.
In an exemplary embodiment of the present disclosure, the side dam support is adjustable in length.
In an exemplary embodiment of the present disclosure, the side barrier support is a side barrier jack.
In an exemplary embodiment of the present disclosure, a height of the side stop is adjustable in a height direction of the portal frame.
In an exemplary embodiment of the present disclosure, the side guard includes a plurality of guard plates, the side guard support is provided in plurality, and one side guard support is correspondingly connected to each guard plate.
In an exemplary embodiment of the present disclosure, the side barrier support and the side barrier are connected by a snap fit.
In an exemplary embodiment of the present disclosure, the roadway temporary support device further includes:
and the connecting piece is arranged on the door type support and is used for being connected with an adjacent supporting device.
In an exemplary embodiment of the present disclosure, the connection members are provided at both ends of the top beam.
The temporary supporting device for the roadway can be used for supporting the roadway temporarily. Because one side of the roadway is a goaf which is formed by the caving of a top plate, the goaf can be compacted and stabilized for a period of time, the stability of the roadway cannot be maintained only by the traditional supports of anchor rods, anchor cables and the like, and the top plate of the roadway can be further supported in the roadway by the portal supports; the side shield is arranged on one side close to the goaf, goaf waste rocks are blocked by the side shield to enter the roadway, after the goaf waste rocks are compacted and stabilized, the temporary supporting device is removed, the stability of the roadway is improved, the side shield can be repeatedly used, the economic benefit is high, and the cost of forming the roadway is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty. In the drawings:
fig. 1 is a schematic view of a temporary roadway supporting device according to an embodiment of the present disclosure;
fig. 2 is a front view of a temporary roadway supporting apparatus provided in an embodiment of the present disclosure;
fig. 3 is a schematic view of a roadway temporary supporting device provided in an embodiment of the present disclosure supporting a roadway.
Description of reference numerals:
10. a base;
20. a support bar; 210. a first support bar; 220. a second support bar;
30. a top beam;
40. side blocking;
50. a side dam support;
60. a connecting member;
70. buckling;
81. an anchor rod; 82. and (5) anchor cables.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure. The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting on the number of their objects.
The inventor finds that the roadway mined and formed by the 110 and N00 methods is a gangue side formed by a goaf on one side and a stable coal side on the other side, so that the supporting force and the method need to be different on two sides when temporary supporting is carried out, and an asymmetric supporting method needs to be designed according to the situation on two sides. In addition, one side of the roadway formed by mining with the 110 and N00 construction methods is a gangue side formed by a goaf, gangue in the goaf gradually collapses and is compacted, a gangue blocking device needs to be designed to prevent the gangue from flowing into the goaf, and the supporting force of the gangue blocking device is required to ensure that the gangue cannot flow into the roadway.
In view of the above technical problem, an embodiment of the present disclosure provides a temporary roadway supporting device, as shown in fig. 1 and 2, the temporary roadway supporting device includes: portal frame, side guards 40 and side guard supports 50. The door type bracket comprises a support rod 20 and a top beam 30, the support rod 20 comprises a first support rod 210 and a second support rod 220, and two ends of the top beam 30 are respectively connected with the end parts of the same sides of the first support rod 210 and the second support rod 220; the side stop 40 is arranged on one side of the first support rod 210 far away from the second support rod 220; the side rail support 50 has one end connected to the header bar 30 and the other end connected to the side rail 40, and the side rail support 50 serves to provide a lateral supporting force to the side rail 40.
The temporary supporting device for the roadway can be used for supporting the roadway temporarily. As shown in fig. 3, since one side of the roadway is a goaf, the goaf is formed by roof caving, the goaf can be compacted and stabilized for a period of time, the stability of the roadway cannot be maintained only by the support of the traditional anchor rods 81, anchor cables 82 and the like, and the roof of the roadway can be further supported by the portal supports; the side shield is arranged on one side close to the goaf, goaf waste rocks are blocked by the side shield to enter the roadway, after the goaf waste rocks are compacted and stabilized, the temporary supporting device is removed, the stability of the roadway is improved, the side shield can be repeatedly used, the economic benefit is high, and the cost of forming the roadway is reduced.
In an embodiment of the present disclosure, the heights of the first support rod 210 and the second support rod 220 are adjustable, that is, when the support device is used for supporting roadways with different heights, the top beam 30 can abut against the top plate of the roadway by adjusting the heights of the first support rod 210 and the second support rod 220, so as to form effective support.
As shown in fig. 2, the first support rod 210 may be a first hydraulic column, and the second support rod 220 may be a second hydraulic column. The first hydraulic upright and the second hydraulic upright support hydraulic cylinders which are used for adjusting the height of the bracket and bear the load between the base 10 and the top beam 30, and the high compression strength, bending strength and sealing performance are required. The hydraulic upright post is double-acting type and has two telescopic modes of full hydraulic and mechanical adjustment. The hydraulic telescopic device can be divided into single telescopic device and double (multiple) telescopic device according to the number of the hydraulic telescopic stages, and the latter telescopic device has large telescopic amount and convenient adjustment. The mechanical adjustment mostly adopts a clamping ring lengthening rod type, and the use is not as convenient as full hydraulic, but the structure is simple and the maintenance is easy. The hydraulic upright column mainly comprises a cylinder body, a plunger, a guide sleeve, a sealing element and the like. The cylinder body is made of seamless steel pipes with high strength and good extensibility. The liquid inlet mode is an external liquid inlet mode with a simple structure, a liquid inlet and return port is positioned on the cylinder body, an internal liquid inlet mode is also used when necessary, and a liquid inlet and return joint is positioned at the head of the movable column. The upper end and the lower end of the hydraulic upright post are connected through a multi-purpose spherical surface, so that the unbalance loading can be reduced, and the hydraulic upright post is convenient to rotate, disassemble and assemble.
The working resistance of the first hydraulic upright is larger than that of the second hydraulic upright. After the working face is mined, the top plate collapses to form a goaf, the portal type support is installed on the side, close to the goaf, of the roadway, the working resistance of the first hydraulic stand column of the portal type support close to the goaf is larger than that of the second hydraulic stand column, the asymmetric design is adopted, the requirement of roadway temporary support is better met, and the efficiency of temporary support is fully developed.
The first support rod 210 and the second support rod 220 may be hinged to the top beam 30 in the width direction of the roadway, that is, the first support rod 210 and the second support rod 220 may rotate in the width direction of the roadway relative to the top beam 30. Of course, the first support bar 210 and the second support bar 220 may also be fixedly connected to the top beam 30 to form a fixed integral structure.
Specifically, the base 10 is in direct contact with the roadway floor to transmit support forces and serves to support the load bearing members of the hydraulic columns and other components. The base 10 can be in a single-piece or split-piece structure. The integral type is divided into a bottom seal type and a bottom open type; the split type is divided into a left split type, a right split type and a front split type and a rear split type. The integral stability is good, and the specific pressure of the bottom sealing type bottom plate is small. The split type bottom plate has stronger capability of adapting to the change of the bottom plate, but has poorer stability and adaptability to the soft bottom plate. The front and back split type is only used for a few supporting type brackets and end brackets. This is disclosed preferably just with split type base 10, and each hydraulic column corresponds and sets up a base 10 promptly, is convenient for temporary support device's support and demolish.
Specifically, the top beam 30 directly contacts the top plate, transferring supporting force and serving as a load-bearing member for protecting the top. The top beam 30 is an integral structure, has large supporting force and is convenient to install and transport. Wherein the length of the top beam 30 is matched to the width of the roadway to fit the target roadway as much as possible.
In an embodiment of the disclosure, in the height direction of the portal support, the height of the side baffles 40 is adjustable, so that the portal support is adaptable to roadways with different heights, gangue can be blocked better, the stability of the roadway is improved, and the applicability of the supporting device is improved. The side guard 40 may include a plurality of guard plates, the side guard supporting member 50 is provided with a plurality of guard plates, each guard plate is correspondingly connected with one side guard supporting member 50, and each guard plate may also correspond to the same side guard supporting member 50; of course, the side wall 40 may also include only one baffle, which is not limited by the present disclosure, and the effect of blocking the gangue can be achieved well.
Wherein the height of the side dams 40 can be designed by the specific height of the target roadway for matching. In addition, in the height direction of the portal frame, the side stop 40 can be formed by connecting a plurality of sub side stops, and the height of the whole side stop can be adjusted by adjusting the length of the overlapping area of each sub side stop; each sub side block is provided with a plurality of positioning holes along the height direction of the portal support, and the adjacent sub side blocks are fixed through bolts by adjusting the coincident positioning holes, so that the whole height of the side block is changed. Through the bolt, the positioning holes connected with the adjacent sub side baffles can be adjusted at will, so that the overall height of the side baffles can be adjusted at will within a preset range, and the blocking effect on the waste rocks in the goaf can be formed at a higher level.
As shown in fig. 1, the baffle may be a U-shaped steel plate, that is, the cross section of the baffle is U-shaped. The supporting device may be provided with two U-shaped steel plates located at both sides of the first supporting bar 210. Of course, the baffle may also be a flat plate, or the cross section of the baffle may be V-shaped, W-shaped, etc., and the baffle may be provided with one, three or more U-shaped steel plates, which is not limited in this disclosure.
In one embodiment of the present disclosure, the side dam support 50 is adjustable in length. One end of the side block supporting piece 50 is connected with the top beam 30, the other end of the side block supporting piece is connected with the middle part of the side block 40, and by adjusting the length of the side block supporting piece 50, on one hand, the side supporting force of the side block 40 can be realized, and on the other hand, the included angle between the side block 40 and the first supporting piece support can be changed, so that gangue can be better blocked, and the stability of a roadway is improved.
As shown in fig. 1 and 2, the side barrier supports 50 are jacks. The adjustment of the length of the side block supporter 50 can be achieved by a jack. The operation principle and the structural style of the jack are similar to those of a hydraulic upright column, the jack is mostly in a single-telescopic double-acting type, the borne load is generally smaller than that of the hydraulic upright column, and therefore the cylinder diameter and the pressure are also smaller; the connection of the two ends of the jack can be a hinge pin type.
In one embodiment of the present disclosure, the side rail supports 50 and the side rails 40 are connected by a snap 70. The side stop 40 is provided with a buckle 70, the buckle 70 can be fastened on the side stop 40 through a bolt, the end of the side stop support 50 is connected with the buckle 70, that is, the end of the jack is connected with the buckle 70, the end of the jack and the buckle 70 can be hinged together through a pin shaft, and the other end of the jack is hinged together with the top beam 30 through a pin shaft or a ball head assembly. Of course, the two ends of the side rail supporting member 50 can also be fixedly connected with the buckle 70 and the top rail 30, and the disclosure is not limited thereto.
Wherein, when a plurality of side blocks 40 are provided, each side block 40 can be respectively provided with a buckle 70. Of course, a plurality of side rails 40 may be connected by a single snap 70, which is not limited by the present disclosure.
The buckle 70 may be composed of two parts, and the two sub buckles are fittingly sleeved on the side block 40 and are fastened and connected by a bolt, so as to facilitate the detachment and installation of the buckle. A structure may be provided on the snap fastener adjacent to the side rail support 50 to hinge with the side rail support 50, thereby allowing the side rail support 50 to hinge with the snap fastener 70.
In an embodiment of the present disclosure, the temporary supporting device for a roadway further includes: a connecting member 60. The connector 60 is provided on the portal frame for connection with an adjacent support means. When a plurality of temporary supporting devices are arranged in the roadway, the adjacent supporting devices can be connected together through the connecting piece 60, so that the overall supporting stability and supporting reliability are improved.
In which, as shown in fig. 1, the connecting members 60 are provided at both ends of the cap 30, that is, both ends of the cap 30 of the adjacent support devices are connected together, respectively, thereby improving the stability of the support devices. Of course, the connector 60 may also be provided on the support bar.
The connecting piece 60 is in a sheet shape and is provided with a plurality of connecting holes, and adjacent supporting devices can be connected together through bolts, so that the supporting devices can be conveniently mounted and dismounted.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. The utility model provides a tunnel temporary support device which characterized in that includes:
the door type support comprises a first support rod, a second support rod and a top beam, wherein two ends of the top beam are respectively connected with the end parts of the first support rod and the second support rod on the same side;
the side block is arranged on one side, far away from the second supporting rod, of the first supporting rod;
and one end of the side baffle supporting piece is connected with the top beam, the other end of the side baffle supporting piece is connected with the side baffle, and the side baffle supporting piece is used for providing lateral supporting force for the side baffle.
2. The temporary roadway support apparatus of claim 1, wherein the first support rod is a first hydraulic column and the second support rod is a second hydraulic column.
3. The temporary support device for roadways according to claim 2, wherein the working resistance of the first hydraulic column is greater than the working resistance of the second hydraulic column.
4. The roadway temporary support apparatus of claim 1, wherein the length of the side dam support member is adjustable.
5. The roadway temporary support apparatus of claim 4, wherein the side block support is a side block jack.
6. The roadway temporary support apparatus of claim 1, wherein the height of the side block is adjustable in the height direction of the portal frame.
7. The temporary roadway support device of claim 1, wherein the side shield comprises a plurality of baffle plates, the side shield support member is provided in plurality, and one side shield support member is correspondingly connected to each baffle plate.
8. The roadway temporary support apparatus of claim 1, wherein the side shield support and the side shield are connected by a snap fit.
9. The temporary support device for roadways according to claim 1, further comprising:
and the connecting piece is arranged on the door type support and is used for being connected with an adjacent supporting device.
10. The temporary support device for roadways of claim 9, wherein the connectors are provided at both ends of the top beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110776506.1A CN113279793B (en) | 2021-07-09 | 2021-07-09 | Tunnel temporary support device for N00 construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110776506.1A CN113279793B (en) | 2021-07-09 | 2021-07-09 | Tunnel temporary support device for N00 construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113279793A true CN113279793A (en) | 2021-08-20 |
| CN113279793B CN113279793B (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110776506.1A Active CN113279793B (en) | 2021-07-09 | 2021-07-09 | Tunnel temporary support device for N00 construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1616796A (en) * | 2004-12-06 | 2005-05-18 | 煤炭科学研究总院太原分院 | Suspending movable hydraulic support rack for advanced support in coal cutting roadway |
| CN203717003U (en) * | 2013-09-25 | 2014-07-16 | 四川省煤炭产业集团有限责任公司 | Novel gob-side entry hydraulic support |
| CN105545334A (en) * | 2016-03-07 | 2016-05-04 | 山东科技大学 | Continuous operation variable section type temporary supporting bracket and operation method thereof |
| CN105971649A (en) * | 2016-06-30 | 2016-09-28 | 中煤北京煤矿机械有限责任公司 | Whole set of supporting equipment for roof cutting entry retaining |
| CN105971628A (en) * | 2016-03-31 | 2016-09-28 | 中国矿业大学(北京) | Temporary supporting method for tunneled roadway |
| CN109026110A (en) * | 2018-11-03 | 2018-12-18 | 天地科技股份有限公司 | A kind of advanced hydraulic support of foldable walking |
-
2021
- 2021-07-09 CN CN202110776506.1A patent/CN113279793B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1616796A (en) * | 2004-12-06 | 2005-05-18 | 煤炭科学研究总院太原分院 | Suspending movable hydraulic support rack for advanced support in coal cutting roadway |
| CN203717003U (en) * | 2013-09-25 | 2014-07-16 | 四川省煤炭产业集团有限责任公司 | Novel gob-side entry hydraulic support |
| CN105545334A (en) * | 2016-03-07 | 2016-05-04 | 山东科技大学 | Continuous operation variable section type temporary supporting bracket and operation method thereof |
| CN105971628A (en) * | 2016-03-31 | 2016-09-28 | 中国矿业大学(北京) | Temporary supporting method for tunneled roadway |
| CN105971649A (en) * | 2016-06-30 | 2016-09-28 | 中煤北京煤矿机械有限责任公司 | Whole set of supporting equipment for roof cutting entry retaining |
| CN109026110A (en) * | 2018-11-03 | 2018-12-18 | 天地科技股份有限公司 | A kind of advanced hydraulic support of foldable walking |
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|---|---|
| CN113279793B (en) | 2023-05-26 |
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