CN112727880B - Anti-skid expansion bolt - Google Patents
Anti-skid expansion bolt Download PDFInfo
- Publication number
- CN112727880B CN112727880B CN202011572657.7A CN202011572657A CN112727880B CN 112727880 B CN112727880 B CN 112727880B CN 202011572657 A CN202011572657 A CN 202011572657A CN 112727880 B CN112727880 B CN 112727880B
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- China
- Prior art keywords
- bolt
- expansion
- nut
- sleeve
- slip
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 210000000078 claw Anatomy 0.000 claims description 23
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
- F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
- F16B13/066—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention relates to the field of bolts, in particular to an anti-skidding expansion bolt which comprises a bolt structure, an anti-skidding structure and an expansion structure, wherein the bolt structure comprises a bolt body and a bolt head; the use of the bolt structure can not only prevent the external sleeve from rotating along with the bolt, but also extrude the anti-skid structure and the expansion structure simultaneously to indirectly control the anti-skid structure and the expansion structure; the anti-slip structure increases the contact area between the anti-slip structure and the mounting hole and the wall surface, and meanwhile, the anti-slip structure extends into the mounting hole to clamp the inner wall of the mounting hole, so that the slip of the bolt structure is effectively prevented; the use of expanding structure has improved the interlock intensity between bolt construction and the mounting hole internal diameter to expanding structure is deepened the wall body inner part ability and is stronger, and is fixed more firm, and expanding structure adopts barb structure simultaneously, can prevent sliding and rotatory around the expanding bolt simultaneously, improves stability.
Description
Technical Field
The invention relates to the field of bolts, in particular to an anti-skidding expansion bolt.
Background
At present, an expansion bolt sold in the market mainly comprises a conical head screw rod, an expansion sleeve barrel, a gasket and a nut, wherein three openings are processed at one end of an expansion sleeve barrel. The expansion bolt realizes fixation by expanding the expansion sleeve through outward movement of the conical head screw rod, and only the tail end of the bolt plays a role in fixation. Therefore, the expansion bolt has lower strength and small bearing capacity, and the expansion sleeve is easy to rotate along with the screw rod in the rotation process of the screw rod, so that the problems of difficult installation, insufficient expansion of the expansion sleeve and the like are caused, and the use effect is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an anti-skidding expansion bolt.
The technical scheme adopted by the invention for solving the technical problems is as follows: an antiskid expansion bolt comprises a bolt structure, an antiskid structure and an expansion structure; the bolt structure for driving the expansion structure to expand is fixedly connected with the anti-skid structure; the anti-slip structure for preventing the bolt structure from rotating abuts against the bolt structure; the expansion structure for fixing the position of the bolt structure is rotatably connected with the bolt structure.
Specifically, the bolt structure includes screw rod, nut, sleeve, antislip strip, accomodates groove, stop nut and spacing hole, the screw rod with the antiskid structure rotates to be connected, the nut with the top threaded connection of screw rod, the screw rod rotate connect in telescopic inside, it is a plurality of the antislip strip evenly is fixed in telescopic upper portion outer wall is a plurality of accomodate the groove and evenly locate telescopic lower part lateral wall, stop nut with the bottom threaded connection of screw rod, just stop nut rotate connect in inside the telescopic bottom, spacing hole is located telescopic inside, just the screw rod with spacing hole rotates to be connected, just spacing bolt contradicts the bottom in spacing hole.
Specifically, anti-skidding structure includes backing plate, flexible groove, spacing claw, antiskid ribbed tile and anti-skidding line, the backing plate is fixed in telescopic top, just the bottom surface of nut is contradicted the top surface of backing plate, it is a plurality of flexible groove evenly runs through the backing plate, a plurality of right angle structure the one end one-to-one of spacing claw rotate connect in the inside in flexible groove, just the bottom surface of nut is contradicted spacing claw, the cross-section is the triangle-shaped structure the antiskid ribbed tile is fixed in the inside wall of spacing claw, it is a plurality of anti-skidding line evenly is fixed in the bottom surface of backing plate.
Specifically, the expansion structure comprises an expansion plate, a rotating shaft and a presser foot, the expansion plate is rotatably connected with the inside of the accommodating groove through the rotating shaft, the presser foot is fixed at the bottom end of the expansion plate, and the limit nut abuts against the presser foot.
The invention has the beneficial effects that:
(1) according to the anti-skidding expansion bolt, the bolt structure is used, so that the outer sleeve can be prevented from rotating along with the bolt, the anti-skidding structure and the expansion structure can be simultaneously extruded, and the anti-skidding structure and the expansion structure are indirectly controlled.
(2) According to the anti-skidding expansion bolt, the contact area between the anti-skidding structure and the mounting hole and the wall surface is increased due to the anti-skidding structure, meanwhile, the anti-skidding structure penetrates into the mounting hole to clamp the inner wall of the mounting hole, and the bolt structure is effectively prevented from skidding.
(3) According to the anti-skidding expansion bolt, the engagement strength between the bolt structure and the inner diameter of the mounting hole is improved due to the expansion structure, the expansion structure is higher in capability of penetrating into a wall body, and is firmer to fix, and meanwhile, the expansion structure adopts the barb structure, so that the expansion bolt can be prevented from sliding forwards and backwards and rotating, and the stability is improved.
(4) According to the anti-skidding expansion bolt, the bolt structure, the anti-skidding structure and the expansion structure are matched for use, so that the expansion structure can be controlled to go deep into a wall body to play a role in fixing the bolt structure, the anti-skidding structure can be controlled to go deep into the mounting hole at the same time, the inner wall of the mounting hole is firmly grabbed, an external sleeve is effectively prevented from rotating along with the bolt, the mounting efficiency is improved, the expansion structure can be promoted to effectively expand, and the expansion structure can achieve the best fixing effect.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of the overall structure of a preferred embodiment of an anti-slip expansion bolt according to the present invention;
FIG. 2 is a schematic cross-sectional view of the bolt construction, anti-skid construction and expansion construction shown in FIG. 1;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is an enlarged view of the portion B shown in FIG. 2;
FIG. 5 is a schematic structural view of the anti-slip structure shown in FIG. 2;
fig. 6 is a schematic structural view of the stopping pawl and the anti-skid plate shown in fig. 2.
In the figure: 1. the bolt structure 11, a screw rod 12, a nut 13, a sleeve 14, an anti-slip strip 15, an accommodating groove 16, a limiting nut 17, a limiting hole 2, an anti-slip structure 21, a backing plate 22, a telescopic groove 23, a limiting claw 24, an anti-slip plate 25, an anti-slip pattern 3, an expansion structure 31, an expansion plate 32, a rotating shaft 33 and a pressure foot.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-6, the anti-slip expansion bolt of the invention comprises a bolt structure 1, an anti-slip structure 2 and an expansion structure 3; the bolt structure 1 for driving the expansion structure 3 to expand is fixedly connected with the anti-skid structure 2; the anti-skid structure 2 for preventing the bolt structure 1 from rotating abuts against the bolt structure 1; the expansion structure 3 for fixing the position of the bolt structure 1 is rotationally connected with the bolt structure 1; the use of the bolt structure 1 not only can prevent the sleeve 13 from rotating along with the screw rod 11, but also can simultaneously extrude the anti-skid structure 2 and the expansion structure 3 to indirectly control the anti-skid structure 2 and the expansion structure 3; the anti-skidding structure 2 is used for increasing the contact area between the anti-skidding structure and the mounting hole and the wall surface, and meanwhile, the anti-skidding structure penetrates into the mounting hole to clamp the inner wall of the mounting hole, so that the bolt structure 1 is effectively prevented from skidding; the use of the expansion structure 3 improves the occlusion strength between the bolt structure 1 and the inner diameter of the mounting hole, the expansion structure 3 has stronger capability of penetrating into the wall body, and is more firmly fixed, and meanwhile, the expansion structure 3 adopts a barb structure, so that the expansion bolt can be prevented from sliding forwards and backwards and rotating forwards, and the stability is improved; bolt construction 1 anti-skidding structure 2 with expanding structure 3's cooperation is used, can control expanding structure 3 gos deep into inside the wall body, plays fixedly bolt construction 1's effect can be controlled simultaneously again anti-skidding structure 2 gos deep into the mounting hole, grabs firmly the mounting hole inner wall, effectively avoids sleeve 13 rotates along with the bolt, improves the installation effectiveness, can promote moreover expanding structure 3 effectively expands, makes expanding structure 3 reaches best fixed effect.
Specifically, the bolt structure 1 includes a screw 11, a nut 12, a sleeve 13, anti-slip strips 14, accommodating grooves 15, a limiting nut 16 and a limiting hole 17, the screw 11 is rotatably connected with the anti-slip structure 2, the nut 12 is in threaded connection with the top end of the screw 11, the screw 11 is rotatably connected inside the sleeve 13, the anti-slip strips 14 are uniformly fixed on the outer wall of the upper portion of the sleeve 13, the accommodating grooves 15 are uniformly arranged on the side wall of the lower portion of the sleeve 13, the limiting nut 16 is in threaded connection with the bottom end of the screw 11, the limiting nut 16 is rotatably connected inside the bottom end of the sleeve 13, the limiting hole 17 is arranged inside the sleeve 13, the screw 11 is rotatably connected with the limiting hole 17, and the limiting bolt 16 abuts against the bottom end of the limiting hole 17; firstly, the nut 12 is installed at the top end of the screw rod 11, the screw rod 11 is inserted into the sleeve 13, then the limit nut 16 is in threaded connection with the bottom end of the screw rod 11, and the limit nut 16 cannot rotate, the screw rod 11 is pulled upwards, the screw rod 11 drives the limit nut 16 to slide in the sleeve 13 until the limit nut 16 just abuts against the expansion structure 3, then the sleeve 13 is inserted into the mounting hole, and the anti-slip strip 14 abuts against the inner wall of the mounting hole, so that the sleeve 13 can be effectively prevented from rotating; fix the top of screw rod 11 to twist and move nut 12, nut 12 extrudees anti-skidding structure 2 makes anti-skidding structure 2 fully contacts the wall of mounting hole opening part, simultaneously nut 12 makes screw rod 11 outwards removes, screw rod 11 drives its bottom limit nut 16 removes, limit nut 16 promotes expanding structure 3 makes expanding structure 3 opens, inserts in the mounting hole inner wall, thereby makes screw rod 11 with sleeve 13 is fixed in the mounting hole.
Specifically, the anti-slip structure 2 comprises a backing plate 21, a telescopic groove 22, a limiting claw 23, an anti-slip plate 24 and anti-slip patterns 25, wherein the backing plate 21 is fixed at the top end of the sleeve 13, the bottom surface of the nut 12 abuts against the top surface of the backing plate 21, the telescopic grooves 22 uniformly penetrate through the backing plate 21, one end of each of the limiting claws 23 in a right-angle structure is rotatably connected inside the telescopic groove 22 in a one-to-one correspondence manner, the bottom surface of the nut 12 abuts against the limiting claw 23, the anti-slip plate 24 is fixed on the inner side wall of the limiting claw 23 and has a triangular cross section, and the anti-slip patterns 25 are uniformly fixed on the bottom surface of the backing plate 21; when the nut 12 rotates to enable the screw rod 11 to move outwards, the bottom surface of the nut 12 can extrude the limiting claw 23 and the backing plate 21, so that the limiting claw 23 rotates in the telescopic groove 22, the bottom end of the limiting claw 23 is inserted into the mounting hole, the limiting claw 23 drives the anti-skid plate 24 to be inserted into the wall body at the opening of the mounting hole, the backing plate 21 and the wall surface generate strong friction force, meanwhile, the nut 12 gradually extrudes the backing plate 21, so that the backing plate 21 is more tightly attached to the wall surface, the anti-skid patterns 25 on the bottom surface of the backing plate 21 can be tightly attached to the wall surface, and the backing plate 21 is prevented from rotating; in the rotation process of the nut 12, the bottom surface of the nut abuts against the backing plate 22, so that the backing plate 22 is driven to rotate, the sleeve 13 rotates along with the nut 12, and the installation efficiency is reduced, so that the limiting claw 23, the anti-skid plate 24, the anti-skid threads 25 and the anti-skid strips 14 are matched with each other, and the sleeve 13 can be effectively prevented from rotating along with the nut 12.
Specifically, the expansion structure 3 includes an expansion plate 31, a rotating shaft 32 and a presser foot 33, the expansion plate 31 is rotatably connected with the inside of the accommodating groove 15 through the rotating shaft 33, the presser foot 33 is fixed at the bottom end of the expansion plate 31, and the limit nut 16 abuts against the presser foot 33; the nut 12 rotates to enable the screw rod 11 to drive the limiting nut 16 to move outwards, the limiting nut 16 pushes the presser foot 33, the presser foot 33 drives the expansion plate 31 to rotate around the rotating shaft 32, the expansion plate 31 is expanded from the accommodating groove 15, the expansion angle of the expansion plate 31 is larger along with the increase of the displacement distance of the limiting nut 16, and finally the top end of the expansion plate 31 is inserted into the inner wall body of the mounting hole to firmly fix the sleeve 13 in the mounting hole and prevent the sleeve from falling off.
Firstly, the nut 12 is installed at the top end of the screw rod 11, the screw rod 11 is inserted into the sleeve 13, then the limit nut 16 is in threaded connection with the bottom end of the screw rod 11, and the limit nut 16 cannot rotate, the screw rod 11 is pulled upwards, the screw rod 11 drives the limit nut 16 to slide in the sleeve 13 until the limit nut 16 just abuts against the expansion structure 3, then the sleeve 13 is inserted into the mounting hole, and the anti-slip strip 14 abuts against the inner wall of the mounting hole, so that the sleeve 13 can be effectively prevented from rotating; fixing the top end of the screw rod 11, screwing the nut 12, rotating the nut 12 to enable the screw rod 11 to move outwards, simultaneously extruding the limiting claw 23 and the backing plate 21 by the bottom surface of the nut 12 to enable the limiting claw 23 to rotate in the telescopic groove 22, inserting the bottom end of the limiting claw 23 into the mounting hole, driving the anti-skid plate 24 to be inserted into the wall body at the opening of the mounting hole by the limiting claw 23 to enable the backing plate 21 and the wall surface to generate strong friction force, and simultaneously gradually extruding the backing plate 21 by the nut 12 to enable the backing plate 21 to be more tightly attached to the wall surface, wherein the anti-skid threads 25 on the bottom surface of the backing plate 21 can be tightly attached to the wall surface to avoid the rotation of the backing plate 21; in the rotation process of the nut 12, the bottom surface of the nut abuts against the backing plate 22, so that the backing plate 22 is driven to rotate, the sleeve 13 rotates along with the nut 12, and the installation efficiency is reduced, so that the limiting claws 23, the anti-skid plates 24 and the anti-skid threads 25 are matched with the anti-skid strips 14, and the sleeve 13 can be effectively prevented from rotating along with the nut 12; meanwhile, the nut 12 rotates to enable the screw rod 11 to drive the limiting nut 16 to move outwards, the limiting nut 16 pushes the presser foot 33, the presser foot 33 drives the expansion plate 31 to rotate around the rotating shaft 32, the expansion plate 31 is expanded from the accommodating groove 15, the expansion angle of the expansion plate 31 is larger along with the increase of the displacement distance of the limiting nut 16, finally, the top end of the expansion plate 31 is inserted into the inner wall body of the mounting hole, the sleeve 13 is firmly fixed in the mounting hole and is difficult to fall off, and therefore the screw rod 11 is fixed in the mounting hole.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are intended to be within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. An antiskid expansion bolts which characterized in that: comprises a bolt structure (1), an anti-skid structure (2) and an expansion structure (3); the bolt structure (1) used for driving the expansion structure (3) to expand is fixedly connected with the anti-skid structure (2); the anti-skid structure (2) used for preventing the bolt structure (1) from rotating is abutted against the bolt structure (1); the expansion structure (3) used for fixing the position of the bolt structure (1) is rotationally connected with the bolt structure (1);
the bolt structure (1) comprises a screw (11), a nut (12), a sleeve (13), anti-slip strips (14), accommodating grooves (15), a limiting nut (16) and a limiting hole (17), wherein the screw (11) is rotationally connected with the anti-slip structure (2), the nut (12) is in threaded connection with the top end of the screw (11), the screw (11) is rotationally connected with the inside of the sleeve (13), the anti-slip strips (14) are uniformly fixed on the outer wall of the upper part of the sleeve (13), the accommodating grooves (15) are uniformly arranged on the side wall of the lower part of the sleeve (13), the limiting nut (16) is in threaded connection with the bottom end of the screw (11), the limiting nut (16) is rotationally connected with the inside of the bottom end of the sleeve (13), the limiting hole (17) is arranged inside the sleeve (13), and the screw (11) is rotationally connected with the limiting hole (17), the limiting nut (16) abuts against the bottom end of the limiting hole (17);
anti-skidding structure (2) are including backing plate (21), flexible groove (22), spacing claw (23), antiskid ribbed tile (24) and anti-skidding line (25), backing plate (21) are fixed in the top of sleeve (13), just the bottom surface of nut (12) is contradicted the top surface of backing plate (21) is a plurality of flexible groove (22) evenly runs through backing plate (21), a plurality of right angle structure one-to-one of one end of spacing claw (23) rotate connect in the inside of flexible groove (22), just the bottom surface of nut (12) is contradicted spacing claw (23), the cross-section are the triangle-shaped structure antiskid ribbed tile (24) are fixed in the inside wall of spacing claw (23), it is a plurality of anti-skidding line (25) evenly are fixed in the bottom surface of backing plate (21).
2. An anti-slip expansion bolt according to claim 1, characterised in that: the expansion structure (3) comprises an expansion plate (31), a rotating shaft (32) and a presser foot (33), the expansion plate (31) is rotatably connected with the inside of the accommodating groove (15) through the rotating shaft (32), the presser foot (33) is fixed at the bottom end of the expansion plate (31), and the limit nut (16) abuts against the presser foot (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011572657.7A CN112727880B (en) | 2020-12-22 | 2020-12-22 | Anti-skid expansion bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011572657.7A CN112727880B (en) | 2020-12-22 | 2020-12-22 | Anti-skid expansion bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112727880A CN112727880A (en) | 2021-04-30 |
| CN112727880B true CN112727880B (en) | 2022-08-23 |
Family
ID=75616969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011572657.7A Active CN112727880B (en) | 2020-12-22 | 2020-12-22 | Anti-skid expansion bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112727880B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116952444B (en) * | 2023-09-20 | 2023-12-12 | 江天科技有限公司 | Intelligent bolt and nut gasket sensor |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4836708A (en) * | 1988-07-05 | 1989-06-06 | Motorola, Inc. | Self-locking, anti-rotational retaining washer for a "D" shaped shaft |
| IT231161Y1 (en) * | 1993-10-07 | 1999-07-12 | Elematic Srl | ANCHOR WITH ANTI-SLIP EXPANSION CONE |
| CN2259521Y (en) * | 1996-12-16 | 1997-08-13 | 钱天姮 | Torsional expand dowel |
| CN2641365Y (en) * | 2003-09-30 | 2004-09-15 | 颜端伟 | Expansion bolt |
| US9151316B2 (en) * | 2012-07-25 | 2015-10-06 | Alan R. Smith | Fastener with unidirectional latch |
| CN207848130U (en) * | 2017-12-12 | 2018-09-11 | 苏州茂隆电梯配件有限公司 | It is a kind of to draw quick-fried anchor bolt |
| CN207848139U (en) * | 2017-12-13 | 2018-09-11 | 苏州茂隆电梯配件有限公司 | A kind of hollow anchor bolt |
| CN108591213B (en) * | 2018-05-02 | 2019-03-22 | 成都明杰科技有限公司 | Enhance the upset bolt of friction self-locking intensity |
-
2020
- 2020-12-22 CN CN202011572657.7A patent/CN112727880B/en active Active
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| Publication number | Publication date |
|---|---|
| CN112727880A (en) | 2021-04-30 |
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Effective date of registration: 20220801 Address after: 056000 luchan Street South Jianshe Street East, Southwest Industrial Park, Yongnian District, Handan City, Hebei Province Applicant after: Hebei xilide Hardware Manufacturing Co.,Ltd. Address before: 100000 room 1201, building 11, huishixin garden, Guangcai Road, dahongmen street, Fengtai District, Beijing Applicant before: Xu Zhipei |
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