CN219345734U - Air pipe installation hanging bracket and installation structure - Google Patents
Air pipe installation hanging bracket and installation structure Download PDFInfo
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- CN219345734U CN219345734U CN202320341427.2U CN202320341427U CN219345734U CN 219345734 U CN219345734 U CN 219345734U CN 202320341427 U CN202320341427 U CN 202320341427U CN 219345734 U CN219345734 U CN 219345734U
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Abstract
The utility model relates to the technical field of building construction, in particular to an air pipe installation hanging bracket and an installation structure, wherein the air pipe installation hanging bracket comprises: the embedded part, the first plate, the first structural part, the second plate and the second structural part are sequentially connected; the embedded part is provided with a first slot; the first plate is connected with the embedded part through a first detachable fastening structure clamped in the first slot; the first detachable fastening structure can move in a second slot formed in the first plate; the first structural member is provided with a vertical third slot; the second plate is connected with the first structural member through a second detachable fastening structure, and the second detachable fastening structure is clamped in the third slot and can move; the second plate is provided with a fourth slot; the second detachable fastening structure can move in the fourth slot; the second structural member is connected with the flange through a third detachable fastening structure; this application is through fluting and can dismantle fastening structure cooperation, adjusts the position of tuber pipe installation gallows and tuber pipe in a plurality of directions, easy dismounting does benefit to the installation and overhauls.
Description
Technical Field
The utility model relates to the technical field of building construction, in particular to an air pipe installation hanging bracket and an air pipe installation structure.
Background
The prior air duct is generally installed by adopting an angle steel bracket and a flange, specifically, the air duct is firstly installed in the flange, then the angle steel arranged on two sides of the flange is prolonged to the roof, and the root of the angle steel is welded on an embedded steel plate arranged on the roof. The air duct installation structure is simple, the manufacturing cost is low, and the air duct installation structure is a conventional type of air duct installation.
However, in the field construction, the angle steel bracket takes root on the embedded steel plate, the embedded steel plate needs to be positioned and fixed before the concrete is poured, and the embedded steel plate is often deviated due to the vibration of the subsequent concrete. The size of the commonly used embedded steel plate is 300mm multiplied by 300mm, and once the embedded steel plate is subjected to position deviation of more than 50mm, the embedded steel plate is not usable. The steel bottom plate can only be mounted with expansion bolts. The cost of installing the embedded steel plate and the expansion bolts greatly increases the construction cost of installing the air pipe.
Disclosure of Invention
Therefore, the utility model aims to overcome the defects that the prior pre-buried steel plate is easy to generate position deviation when the air pipe is installed, and the construction cost is increased after the steel bottom plate is installed by adopting expansion bolts for reworking and remedying.
In order to achieve the above object, the present utility model provides an air duct installation hanger adapted to hoist an air duct installed in a flange, the air duct installation hanger comprising:
the embedded part is embedded at the top of the building, and a first slot arranged along the length direction of the air pipe is arranged on the embedded part;
the top end of the first detachable fastening structure is suitable for being clamped in the first slot, and the top end of the first detachable fastening structure can move in the first slot; a second slot is formed in the first plate, and the second slot is formed in a direction perpendicular to the length direction of the air pipe; the bottom end of the first detachable fastening structure is adapted to move into position within the second slot;
the top end of the first structural member is connected with the first plate; a third slot is formed in the first structural member, and the third slot is arranged in the vertical direction;
the second plate is connected with the first structural member through a second detachable fastening structure, one end of the second detachable fastening structure is suitable for being clamped in the third slot, and one end of the second detachable fastening structure can move in the third slot; a fourth slot is formed in the second plate, and the fourth slot is formed in the length direction of the air pipe; the other end of the second detachable fastening structure is suitable for moving in the fourth slot;
one end of the second structural member is connected with the second plate; a fifth slot is formed in the second structural member, and the fifth slot is arranged along the direction perpendicular to the length direction of the air pipe; the second structural member is connected with the flange through a third detachable fastening structure; one end of the third detachable fastening structure is suitable for being clamped in the fifth slot, and one end of the third detachable fastening structure can move in position in the fifth slot.
Optionally, the first slot, the third slot and the fifth slot each include: a first curl and a second curl disposed opposite each other;
the top end of the first detachable fastening structure is suitable for being clamped in the first curled edge and the second curled edge of the first slot;
one end of the second detachable fastening structure is suitable for being clamped in the first curled edge and the second curled edge in the third slot;
one end of the third detachable fastening structure is suitable for being clamped in the first curled edge and the second curled edge in the fifth slot.
Optionally, tooth structures contacting the first detachable fastening structure are arranged at the first curled edge and the second curled edge of the embedded part.
Optionally, the first structural member and the second structural member are both C-shaped steel.
Optionally, the embedded part is an embedded groove type clamping rail.
Optionally, the first detachable fastening structure, the second detachable fastening structure and the third detachable fastening structure are all structures of bolt and nut matching.
Optionally, the first plate and the second plate are both steel plates.
Optionally, the top end of the first structural member is welded with the first plate; one end of the second structural member is welded with the second plate.
The utility model also provides an air duct mounting structure, which comprises: two air pipe mounting hanging frames; the two air pipe mounting hanging brackets are respectively positioned at two sides of the air pipe;
one of the air pipe mounting hanging frames is suitable for being connected with a first angle steel arranged at the top of the flange; the other air pipe mounting hanging bracket is suitable for being connected with third angle steel arranged at the bottom of the flange.
Optionally, the flange is composed of a first angle steel, a second angle steel, a third angle steel and a fourth angle steel which are sequentially connected.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
1. the utility model provides an air duct installation hanging bracket, which is suitable for hanging an air duct installed in a flange, and comprises: the embedded part is embedded at the top of the building, and a first slot arranged along the length direction of the air pipe is arranged on the embedded part; the top end of the first detachable fastening structure is suitable for being clamped in the first slot, and the top end of the first detachable fastening structure can move in the first slot; a second slot is formed in the first plate, and the second slot is formed in a direction perpendicular to the length direction of the air pipe; the bottom end of the first detachable fastening structure is adapted to move into position within the second slot; the top end of the first structural member is connected with the first plate; a third slot is formed in the first structural member, and the third slot is arranged in the vertical direction; the second plate is connected with the first structural member through a second detachable fastening structure, one end of the second detachable fastening structure is suitable for being clamped in the third slot, and one end of the second detachable fastening structure can move in the third slot; a fourth slot is formed in the second plate, and the fourth slot is formed in the length direction of the air pipe; the other end of the second detachable fastening structure is suitable for moving in the fourth slot; one end of the second structural member is connected with the second plate; a fifth slot is formed in the second structural member, and the fifth slot is arranged along the direction perpendicular to the length direction of the air pipe; the second structural member is connected with the flange through a third detachable fastening structure; one end of the third detachable fastening structure is suitable for being clamped in the fifth slot, and one end of the third detachable fastening structure can move in the fifth slot; by adopting the technical scheme, the position relationship between the air duct mounting hanging frame and the air duct can be adjusted in multiple scale directions through the cooperation of the slotting and the detachable fastening structure, so that the adjustment of larger displacement and the fine adjustment of the position can be performed; when errors occur in civil construction and air duct installation, the embedded part can still be used. In addition, the detachable fastening structure is adopted for assembly connection, so that the detachable fastening structure is convenient to disassemble and assemble, and is beneficial to the installation and maintenance of the air pipe installation hanging bracket; the partial prefabrication operation can be completed in a factory, so that the efficiency and quality of the on-site air duct installation construction are greatly improved, the construction environment of on-site workers is improved, and the economy of the air duct installation is improved.
2. The utility model includes on the first slot, the third slot and the fifth slot: a first curl and a second curl disposed opposite each other; the top end of the first detachable fastening structure is suitable for being clamped in the first curled edge and the second curled edge of the first slot; one end of the second detachable fastening structure is suitable for being clamped in the first curled edge and the second curled edge in the third slot; one end of the third detachable fastening structure is suitable for being clamped in the first curled edge and the second curled edge in the fifth slot; the application adopts above-mentioned technical scheme, through first turn-up and second turn-up to dismantling fastening structure and stabilize the card and hold, guarantee the reliability that can dismantle fastening structure and connect.
3. The tooth structure contacted with the first detachable fastening structure is arranged at the first curled edge and the second curled edge of the embedded part; by adopting the technical scheme, the application ensures the firmness degree of clamping the embedded part and the first detachable fastening structure.
4. The first structural member and the second structural member are both C-shaped steel; by adopting the technical scheme, the air duct installation hanging bracket mainly comprises standard C-shaped steel, is convenient to purchase and reduces cost.
5. The embedded part is an embedded groove type clamping rail; by adopting the technical scheme, the embedded part is specifically limited to be the embedded groove type clamping rail, so that the embedded part has higher bearing capacity, is convenient to purchase, and reduces cost.
6. The first detachable fastening structure, the second detachable fastening structure and the third detachable fastening structure are all structures with bolts and nuts matched; the application adopts above-mentioned technical scheme, realizes dismantling the connection through bolt and nut combination commonly used, not only improves the stability of dismantling the connection, makes things convenient for the dismouting, makes things convenient for the purchase moreover, reduce cost.
7. The first plate and the second plate are steel plates; the application adopts above-mentioned technical scheme, specifically limits the material of first plate and second plate, improves whole tuber pipe installation gallows's intensity and reliability.
8. The top end of the first structural member is welded with the first plate; one end of the second structural member is welded with the second plate; by adopting the technical scheme, the first structural member and the first plate are conveniently prefabricated and connected in advance in a factory, and the second structural member and the second plate are prefabricated and connected in advance; the reliability of the connection is improved through welding connection; the efficiency and the quality of the on-site air pipe installation construction are greatly improved, the construction environment of on-site workers is improved, and the economy of the air pipe installation is improved.
9. The utility model provides an air duct mounting structure, which comprises: two air pipe mounting hanging frames; the two air pipe mounting hanging brackets are respectively positioned at two sides of the air pipe; one of the air pipe mounting hanging frames is suitable for being connected with a first angle steel arranged at the top of the flange; the other air pipe mounting hanging bracket is suitable for being connected with third angle steel arranged at the bottom of the flange; by adopting the technical scheme, the weight of the air pipe is shared by the two air pipe mounting hanging brackets at the top and the bottom of the connecting flange; the adoption of the arrangement is beneficial to ensuring the stability of the air pipe installation.
Drawings
In order to more clearly illustrate the embodiments of the present utility model 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 utility model, 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 perspective view of an air duct mounting hanger according to an embodiment of the present utility model.
Reference numerals illustrate:
1. an embedded part; 2. a first detachable fastening structure; 3. a first plate member; 4. a first structural member; 5. a second plate member; 6. a second detachable fastening structure; 7. a second structural member; 8. a third detachable fastening structure; 9. an air duct; 10. a flange; 11. a first angle steel; 12. a second angle steel; 13. a third angle steel; 14. fourth angle steel.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, 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 utility model 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 utility model. 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 utility model, 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 utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
An embodiment of an air duct mounting hanger as shown in fig. 1, adapted to mount an air duct 9 mounted in a flange 10, the air duct mounting hanger comprising: the embedded part 1, the first plate 3, the first structural part 4, the second plate 5 and the second structural part 7 are sequentially connected. Specifically, the flange 10 is composed of a first angle steel 11, a second angle steel 12, a third angle steel 13 and a fourth angle steel 14 which are sequentially connected. The first angle steel 11, the second angle steel 12, the third angle steel 13 and the fourth angle steel 14 surround the periphery of the air pipe 9.
The embedded part 1 is embedded in the top of a building, a first slot arranged along the length direction of the air pipe 9 is arranged on the embedded part 1, and the opening of the first slot is downward; the first plate 3 which is horizontally arranged is connected to the bottom of the embedded part 1 through the first detachable fastening structure 2, the top end of the first detachable fastening structure 2 is suitable for being clamped in the first slot, and the top end of the first detachable fastening structure 2 can move in position in the first slot; a second slot is formed in the first plate 3, and the second slot is formed in a direction perpendicular to the length direction of the air pipe 9; the bottom end of the first releasable fastening structure 2 is adapted to move into position within the second slot. The top end of the first structural member 4 is welded with the bottom surface of the first plate 3; a third slot is formed in the first structural member 4, and the third slot is arranged in the vertical direction. The second plate 5 is connected with the first structural member 4 through a second detachable fastening structure 6, one end of the second detachable fastening structure 6 is suitable for being clamped in the third slot, and one end of the second detachable fastening structure 6 can move in position in the third slot; a fourth slot is arranged on the second plate 5 and is arranged along the length direction of the air pipe 9; the other end of the second detachable fastening structure 6 is adapted to move position in the fourth slot. One end of the second structural member 7 is welded with the second plate 5; a fifth slot is formed in the second structural member 7, and the fifth slot is arranged along a direction perpendicular to the length direction of the air pipe 9; the second structural member 7 is connected with the flange 10 through a third detachable fastening structure 8; one end of the third detachable fastening structure 8 is adapted to be clamped in the fifth slot, and one end of the third detachable fastening structure 8 is capable of moving in position in the fifth slot. Specifically, the first slot, the third slot and the fifth slot all comprise: a first curl and a second curl disposed opposite each other; the top end of the first detachable fastening structure 2 is suitable for being clamped in the first curled edge and the second curled edge of the first slot; one end of the second detachable fastening structure 6 is suitable for being clamped in the first curled edge and the second curled edge in the third slot; one end of the third detachable fastening structure 8 is adapted to be caught in the first and second curls in the fifth slot. Further, tooth structures which are in contact with the first detachable fastening structure 2 are arranged at the first curled edge and the second curled edge of the embedded part 1. Specifically, the first detachable fastening structure 2, the second detachable fastening structure 6 and the third detachable fastening structure 8 are all structures of bolt and nut matching. The first plate 3 and the second plate 5 are both steel plates. More specifically, the embedded part 1 is an embedded groove type clamping rail, and the first structural part 4 and the second structural part 7 are both C-shaped steel. As the angle steel bracket adopted in the conventional air pipe installation is connected with the embedded steel plate in a welding mode. The length measurement, cutting, welding, painting and inspection of the angle steel bracket are all required to be carried out on a construction site, the construction condition is poor, and the installation efficiency is low. By adopting the technical scheme, the first structural member 4 and the first plate 3 can be welded and connected in a factory in advance; welding the second structural member 7 with the second plate 5; and then transported to site construction and installation, so that the construction efficiency is improved, and the operating environment is improved.
As shown in fig. 1, the present utility model further provides an air duct mounting structure, including: two air pipe mounting hanging frames; the two air pipe mounting hangers are respectively positioned at two sides of the air pipe 9; one of the air pipe installation hanging frames is connected with a first angle steel 11 at the upper top of the flange 10; the other air pipe mounting hanger is connected with third angle steel 13 at the upper bottom of the flange 10.
The mounting steps of the air duct 9 with flange 10 according to the utility model are briefly described as follows:
s1, counting errors of civil construction and air pipe 9 installation, determining an adjusting range of an air pipe installation hanging bracket, and further determining the lengths of a first structural member 4, a second structural member 7, a second slotting, a fourth slotting and an embedded part 1; the structural dimensions of the components are also affected by the load requirements;
s2, analyzing the load of the air pipe installation hanging frame, designing the structural size of the air pipe installation hanging frame according to the industry standard specification, and carrying out mechanical calculation and experimental study on the bearing capacity of the air pipe installation hanging frame; determining the model, specification and corresponding load of an air pipe installation hanging bracket; the industry standard specification includes: 3000 RCCs-M H or ASME NF that can be referred to in the nuclear power industry, SH3073 that can be referred to in the petrochemical industry, and the like.
S3, installing the embedded part 1;
s4, prefabricating and connecting the first structural member 4 and the first plate 3 in a factory; connecting the second plate 5 and the second structural member 7;
s5, connecting the embedded part 1 and the first plate 3 through the first detachable fastening structure 2 on a construction site; the position of the air pipe mounting hanging bracket along the length direction of the air pipe 9 is adjusted by adjusting the position of the first detachable fastening structure 2 in the first slot; the distance between the air pipe mounting hanging bracket and the air pipe 9 is adjusted by adjusting the position of the first detachable fastening structure 2 in the second slot; connecting the first structural member 4 and the second plate member 5 by means of a second detachable fastening structure 6; the height of the air pipe mounting hanging bracket in the vertical direction is adjusted by adjusting the position of the second detachable fastening structure 6 in the third slotting; the position of the air pipe mounting hanging bracket along the length direction of the air pipe 9 is adjusted by adjusting the position of the second detachable fastening structure 6 in the fourth slot; connecting the second structural member 7 and the flange 10 by means of a third detachable fastening structure 8; specifically, two air duct mounting hangers are respectively arranged on two sides of the air duct 9; a first angle steel 11 connecting one of the duct mounting hangers with the upper top of the flange 10; and a third angle steel 13 connecting the other air pipe mounting hanger with the upper bottom of the flange 10. The distance between the air pipe mounting hanging bracket and the air pipe 9 is adjusted by adjusting the position of the third detachable fastening structure 8 in the fifth slot.
According to the detachable fastening structure, through the first detachable fastening structure 2, the detachable fastening structure can move in the length direction along the first slot and can move in the second slot of the first plate 3, so that civil engineering construction deviation in a certain range is compensated; and through the second detachable fastening structure 6 moving along the third slot, the second plate 5 can move up and down along the first structural member 4, and the installation height of the air duct 9 can be adjusted. The second detachable fastening structure 6 moves along the fourth groove, so that the position of the second plate 5 can be finely adjusted back and forth along the length direction of the air pipe 9; by the third detachable fastening means 8 moving in the fifth slot, a secure connection of the second structural member 7 with the flange 10 is ensured.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (10)
1. An air duct mounting hanger adapted to hoist an air duct (9) mounted in a flange (10), comprising:
the embedded part (1) is embedded at the top of the building, and a first slot arranged along the length direction of the air pipe (9) is arranged on the embedded part (1);
the first plate (3) is connected to the bottom of the embedded part (1) through a first detachable fastening structure (2), the top end of the first detachable fastening structure (2) is suitable for being clamped in the first slot, and the top end of the first detachable fastening structure (2) can move in position in the first slot; a second slot is formed in the first plate (3), and the second slot is formed in a direction perpendicular to the length direction of the air pipe (9); the bottom end of the first detachable fastening structure (2) is adapted to move into position within the second slot;
the top end of the first structural part (4) is connected with the first plate (3); a third slot is formed in the first structural member (4), and the third slot is arranged in the vertical direction;
the second plate (5) is connected with the first structural member (4) through a second detachable fastening structure (6), one end of the second detachable fastening structure (6) is suitable for being clamped in the third slot, and one end of the second detachable fastening structure (6) can move in position in the third slot; a fourth slot is formed in the second plate (5), and the fourth slot is formed in the length direction of the air pipe (9); the other end of the second detachable fastening structure (6) is suitable for moving in the fourth slot;
one end of the second structural member (7) is connected with the second plate (5); a fifth slot is formed in the second structural member (7), and the fifth slot is arranged along the direction perpendicular to the length direction of the air pipe (9); the second structural member (7) is connected with the flange (10) through a third detachable fastening structure (8); one end of the third detachable fastening structure (8) is suitable for being clamped in the fifth slot, and one end of the third detachable fastening structure (8) can move in position in the fifth slot.
2. The ductwork mounting hanger of claim 1, wherein,
and the first slot, the third slot and the fifth slot comprise: a first curl and a second curl disposed opposite each other;
the top end of the first detachable fastening structure (2) is suitable for being clamped in the first curled edge and the second curled edge of the first slot;
one end of the second detachable fastening structure (6) is suitable for being clamped in the first curled edge and the second curled edge in the third slot;
one end of the third detachable fastening structure (8) is suitable for being clamped in the first curled edge and the second curled edge in the fifth slot.
3. The hose mounting hanger according to claim 2, characterized in that tooth structures contacting the first detachable fastening structure (2) are provided at the first and second bead of the embedment (1).
4. The ductwork installation hanger according to claim 2, characterized in that the first structural member (4) and the second structural member (7) are both C-section steel.
5. The air duct mounting hanger according to claim 2, wherein the embedded part (1) is an embedded groove type clamping rail.
6. A hose mounting hanger according to any one of claims 1-5, wherein said first detachable fastening structure (2), second detachable fastening structure (6) and third detachable fastening structure (8) are all bolt and nut fitting structures.
7. A ductwork installation hanger according to any of claims 1-5, characterized in that the first plate (3) and the second plate (5) are each steel plates.
8. The ductwork mounting hanger according to claim 7, characterized in that the top end of the first structural member (4) is welded to the first plate member (3); one end of the second structural member (7) is welded with the second plate (5).
9. An air duct mounting structure, comprising: two ductwork mounting hangers according to any one of claims 1 to 8; the two air pipe mounting hanging frames are respectively positioned at two sides of the air pipe (9);
one of the air pipe mounting hanging frames is suitable for being connected with a first angle steel (11) arranged at the top of the flange (10); the other air pipe mounting hanging bracket is suitable for being connected with a third angle steel (13) arranged at the upper bottom of the flange (10).
10. The ductwork mounting structure according to claim 9, characterized in that the flange (10) is composed of a first angle steel (11), a second angle steel (12), a third angle steel (13) and a fourth angle steel (14) which are connected in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320341427.2U CN219345734U (en) | 2023-02-17 | 2023-02-17 | Air pipe installation hanging bracket and installation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320341427.2U CN219345734U (en) | 2023-02-17 | 2023-02-17 | Air pipe installation hanging bracket and installation structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219345734U true CN219345734U (en) | 2023-07-14 |
Family
ID=87095973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320341427.2U Active CN219345734U (en) | 2023-02-17 | 2023-02-17 | Air pipe installation hanging bracket and installation structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219345734U (en) |
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2023
- 2023-02-17 CN CN202320341427.2U patent/CN219345734U/en active Active
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Inventor after: Chen Feng Inventor after: Peng Li Inventor after: Zhao Shuyu Inventor after: Gao Jianzhan Inventor after: Wang Binbin Inventor after: Lu Chuntian Inventor after: Xi Leipeng Inventor after: Yang Huanqi Inventor after: Deng Xingxing Inventor after: Yu Miao Inventor after: Zhang Zhiwei Inventor before: Chen Feng Inventor before: Peng Li Inventor before: Zhao Shuyu Inventor before: Gao Jianzhan Inventor before: Wang Binbin Inventor before: Lu Chuntian Inventor before: Xi Leipeng Inventor before: Yang Huanqi Inventor before: Deng Xingxing Inventor before: Yu Miao Inventor before: Zhang Zhiwei |