CN114922047A - Short suspension rod for suspension bridge - Google Patents
Short suspension rod for suspension bridge Download PDFInfo
- Publication number
- CN114922047A CN114922047A CN202210425744.2A CN202210425744A CN114922047A CN 114922047 A CN114922047 A CN 114922047A CN 202210425744 A CN202210425744 A CN 202210425744A CN 114922047 A CN114922047 A CN 114922047A
- Authority
- CN
- China
- Prior art keywords
- hinge
- cable clamp
- otic placode
- jib
- connecting piece
- Prior art date
- 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.)
- Pending
Links
- 239000000725 suspension Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract description 3
- 230000002277 temperature effect Effects 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention discloses a short suspender for a suspension bridge, belonging to the technical field of bridge engineering. The short boom for a suspension bridge of the present invention comprises: a cable clamp, a connector, and a boom body. The cable clamp, the connecting piece and the suspender main body are sequentially arranged from top to bottom, the connecting piece is arranged between the cable clamp and the suspender main body, the upper end and the lower end of the connecting piece are movably hinged with the cable clamp and the suspender main body respectively, the hinge axis of the cable clamp and the connecting piece extends along the front-back direction, and the hinge axis of the connecting piece and the suspender main body extends along the left-right direction. In a suspension bridge, a short boom connects a main cable and a stiffening beam. When the stiffening beam generates relative displacement trend relative to the main cable due to vehicle load, wind load, temperature effect and the like, the bending stress can be released at two hinged parts of the short suspension rod for the suspension bridge, stress concentration cannot be generated, and the superposition of cyclic load is avoided.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a short suspender for a suspension bridge.
Background
The suspension bridge is a bridge structure with a main cable, a bridge tower and an anchorage as main bearing structures, and the suspension rod supports the stiffening beam and transmits load to the main cable. The upper end and the lower end of the suspender are respectively connected with the main cable and the stiffening beam. In suspension bridge operation in-process, because reasons such as vehicle load, wind load, temperature effect, when stiffening beam and main push-towing rope produced certain relative displacement, the jib will receive the bending and draw effort, and the production and the extension of short jib junction fatigue crack probably result in the short jib fracture to produced crooked tensile stress, has very big potential safety hazard, needs urgent improvement.
Disclosure of Invention
The present invention aims to provide a short boom for a suspension bridge that solves one or more of the technical problems of the prior art, at least providing a useful alternative or creation.
The technical scheme adopted for solving the technical problems is as follows:
a short boom for a suspension bridge, comprising: a cable clamp, a connector and a hanger bar body;
the cable clamp, the connecting piece and the suspender main body are sequentially arranged from top to bottom, the connecting piece is arranged between the cable clamp and the suspender main body, the upper end and the lower end of the connecting piece are respectively movably hinged with the cable clamp and the suspender main body, the hinge axis of the cable clamp and the connecting piece extends along the front-back direction, and the hinge axis of the connecting piece and the suspender main body extends along the left-right direction.
The short suspension rod for the suspension bridge provided by the invention at least has the following beneficial effects: the cable clamp and the suspender main body are connected through the connecting piece, the upper end and the lower end of the connecting piece are respectively hinged with the cable clamp and the suspender main body along the mutually vertical axis directions, and when a relative displacement trend is generated between the cable clamp and the suspender main body, the stress between the cable clamp and the suspender main body can be released through two hinged parts, so that the fatigue load at the connecting structure is prevented from accumulating to generate fracture. According to the short suspender, the cable clamp and the suspender body are respectively hinged with the connecting piece between the cable clamp and the suspender body along different directions, so that stress accumulation cannot be caused under the action force along the bridge direction or the transverse bridge direction, the fatigue fracture accident is avoided, and the service life of the short suspender is obviously prolonged.
As a further improvement of the above technical scheme, a cable clamp ear plate is arranged at the lower end of the cable clamp, a connecting hinge upper ear plate is arranged at the upper end of the connecting piece, first pin holes are formed in the cable clamp ear plate and the connecting hinge upper ear plate, the first pin holes axially extend in the front-back direction and are coaxially aligned, and hinge pins are coaxially arranged in the first pin holes in a penetrating mode in a rotating mode. Through the technical scheme, the cable clamp and the connecting piece are hinged to each other through the first pin hole in the cable clamp lug plate and the connecting hinge upper lug plate and the hinge pin penetrating through the first pin hole, the cable clamp lug plate and the connecting hinge upper lug plate can rotate around the first pin hole relatively, and therefore the component moment of the cable clamp and the hanger rod main body in the left and right directions is released.
As a further improvement of the above technical solution, the number of at least one of the connecting hinge upper ear plates and the cable clamp ear plates is a plurality of pieces, the connecting hinge upper ear plates are arranged at intervals in the front-back direction, the cable clamp ear plates are arranged at intervals in the front-back direction, and the cable clamp ear plates are inserted between two adjacent connecting hinge upper ear plates and are hinged to each other through the hinge pins. Through above-mentioned technical scheme, two adjacent connection hinge upper ear plates can set up both sides around the cable clamp ear plate respectively, and polylith cable clamp ear plate and connection hinge upper ear plate can be followed the axial uniform action who articulates the round pin and are sold in the hinge for articulated round pin atress is even, reduces shear stress, avoids shear stress too big lead to the articulated round pin fracture to become invalid.
As a further improvement of the technical scheme, the upper end of the suspender main body is provided with a suspender lug plate, the lower end of the connecting piece is provided with a connecting hinge lower lug plate, the suspender lug plate and the connecting hinge lower lug plate are respectively provided with a second pin hole, the axial direction of the second pin hole is respectively extended along the left and right direction and coaxially aligned, and the second pin hole is internally coaxially rotated to penetrate through a hinge pin. Through the technical scheme, the connecting piece and the suspender main body can be hinged with each other through the second pin hole on the lower lug plate of the connecting hinge and the suspender lug plate and the hinge pin penetrating through the second pin hole, the lower lug plate of the connecting hinge and the suspender lug plate can rotate relative to the second pin hole, and therefore the cable clamp and the suspender main body are released.
As a further improvement of the technical scheme, the number of at least one of the hanger rod ear plates and the connecting hinge lower ear plates is a plurality of blocks, the hanger rod ear plates are arranged at left and right intervals, the plurality of blocks are arranged at left and right intervals, the connecting hinge lower ear plates are arranged at left and right intervals, and the connecting hinge lower ear plates are inserted between the hanger rod ear plates and are hinged with each other through the hinge pins. Through above-mentioned technical scheme, two adjacent jib otic placodes can set up the left and right sides of otic placode under the hinge of connection respectively, and the axial homogeneous action that articulated round pin can be followed to otic placode and jib otic placode under the polylith connection hinge acts on the articulated round pin for the articulated round pin atress is even, reduces shear stress, avoids shear stress too big to lead to the fracture of articulated round pin to become invalid.
As a further improvement of the technical scheme, one end of the hinge pin is provided with a limiting flange, the other end of the hinge pin is coaxially and threadedly provided with a connecting nut, and the limiting flange is provided with a screwing part. Through the technical scheme, the hinge pin and the connecting nut can rotate relatively through the screwing part, and threaded disassembly and assembly are realized. The cable clamp lug plate and the connecting hinge upper lug plate can be limited between the limiting flange and the connecting nut of the corresponding hinge pin, and the suspender lug plate and the connecting hinge lower lug plate can be limited between the limiting flange and the connecting nut of the corresponding hinge pin. The hinge pin is in threaded connection through the limiting flange and the connecting nut, so that the short suspender structure can be conveniently disassembled and assembled, and the hinge failure can be avoided.
As a further improvement of the above technical solution, the boom body includes an ear plate end piece and a rod body which are arranged up and down, the boom ear plate is disposed at the upper end of the ear plate end piece, the rod body extends up and down in the axial direction, a connection screw hole extending up and down in the axial direction is disposed at the upper end of the rod body, and a connection end connected with the connection screw hole in a threaded manner is disposed at the lower end of the ear plate end piece. Through above-mentioned technical scheme, the jib main part is split type structure, otic placode end piece and the body of rod pass through the link and connect the mutual screw thread fixed connection of screw. The lug plate end piece and the rod body can be processed and formed by adopting a proper processing technology respectively so as to adapt to the respective working conditions of the lug plate end piece and the rod body.
Drawings
The invention is further described with reference to the accompanying drawings and examples;
FIG. 1 is a side view of one embodiment of a short boom for a suspension bridge provided by the present invention;
FIG. 2 is a side view of one embodiment of a short boom for a suspension bridge provided by the present invention;
FIG. 3 is a rear view of one embodiment of a short boom for a suspension bridge provided by the present invention.
In the figure: 10. a short boom; 20. a main cable; 30. a stiffening beam; 100. a cable clamp; 110. a cable clamp ear plate; 120. a clamping groove; 200. a connecting member; 210. connecting the upper ear plate of the hinge; 220. connecting the lower ear plate of the hinge; 300. a boom body; 310. an ear plate end piece; 311. a boom ear plate; 320. a rod body; 400. a hinge pin; 410. a limiting flange; 420. and connecting a nut.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a", "an", etc. are used, the meaning is one or more, the meaning of a plurality is two or more, less, more, etc. are understood as excluding the present number, and more, less, more, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 3, the short boom for a suspension bridge of the present invention makes the following embodiments:
a short boom 10 for a suspension bridge, comprising: a cable clamp 100, a connector 200, and a boom body 300. The cable clamp 100, the connector 200 and the hanger bar body 300 are sequentially disposed from top to bottom, and the connector 200 is disposed between the cable clamp 100 and the hanger bar body 300.
A suspension bridge connecting structure comprising: main cable 20, stiffening beam 30 and short boom 10.
The main cable 20 is provided above the stiffening beam 30. Use the fore-and-aft direction for following the bridge to, the left and right sides direction is horizontal bridge to, stiffening beam 30 extends along the fore-and-aft direction, both ends set up in the top at both ends around stiffening beam 30 around the main push-towing rope 20.
The main cable 20 and the stiffening beam 30 are connected by the short boom 10, and the cable clamp 100 and the boom main body 300 of the short boom 10 are respectively connected with the main cable 20 and the stiffening beam 30, when the stiffening beam 30 has a relative displacement tendency with respect to the main cable 20 due to vehicle load, wind load, temperature effect, etc., the bending stress can be released at two hinge portions of the short boom 10, and a large stress concentration is not generated, thereby avoiding the superposition of cyclic load.
The cable clamp 100 is fixedly coupled to the main cable 20, and the lower end of the boom body 300 is coupled to the stiffening girder 30.
The upper and lower ends of the connector 200 are movably hinged to the cable clamp 100 and the hanger bar body 300, respectively. The hinge axis of the cable clamp 100 and the link 200 extends in the transaxle direction, and the hinge axis of the link 200 and the boom body 300 extends in the transaxle direction.
The cable clamp 100 includes an upper clamp body and a lower clamp body which are vertically disposed. The upper clamp body and the lower clamp body are respectively provided with clamp grooves 120 which are arranged oppositely, and the upper clamp body and the lower clamp body are fixedly connected with each other and clamp the main cable 20 in the two clamp grooves 120.
In this embodiment, go up the clamp and be equipped with the split bolt hole with lower clamp, will through high strength bolt the main push-towing rope presss from both sides tightly. The upper clamp body and the lower clamp body can be clamped on the periphery of the main cable in opposite directions and are fixedly connected with the main cable through the clamp groove.
The connecting member 200 is connected to the lower clip body. The lower end of the lower clamp body is provided with a cable clamp ear plate 110. The upper end of the connecting member 200 is provided with a connecting hinge upper ear plate 210. The cable clamp ear plate 110 and the connecting hinge ear plate 210 are provided with first pin holes. The axial direction of two first pinhole extends and coaxial alignment along the fore-and-aft direction, and coaxial rotation is worn to be equipped with hinge pin 400 in two first pinhole.
The number of the connecting hinge upper ear plates 210 is two. The two connecting hinge upper ear plates 210 are arranged in a front-back opposite manner, and the cable clamp ear plate 110 is inserted between the two connecting hinge upper ear plates 210 and is hinged to each other through the hinge pin 400.
The lower end of the connecting piece 200 is provided with a connecting hinge lower ear plate 220, and the upper end of the suspender main body 300 is provided with a suspender ear plate 311. The suspender lug plate 311 and the connecting hinge lower lug plate 220 are both provided with second pin holes, and the axial directions of the second pin holes extend along the left-right direction and are coaxially aligned. A hinge pin 400 is coaxially and rotatably arranged in the two second pin holes in a penetrating way.
The number of the hanger rod ear plates 311 is two. The two suspension rod ear plates 311 are oppositely arranged left and right, and the connecting hinge lower ear plate 220 is inserted between the two suspension rod ear plates 311 and is hinged with each other through the hinge pin 400.
In the present embodiment, the connection member 200 is a forged workpiece. The connecting member 200 is formed by forging and is machined to form the connecting hinge upper lug plate 210, the connecting hinge lower lug plate 220, and the first pin hole and the second pin hole.
One end of the hinge pin 400 is provided with a limit flange 410, and the other end is coaxially and threadedly provided with a connecting nut 420. The radial dimension of the limiting flange 410 is larger than the first pin hole or the second pin hole, and the limiting flange 410 is provided with a screwing part. In the present embodiment, the screwing portion is an outer peripheral end surface of the limiting flange 410 in the shape of a regular hexagonal boss. In other embodiments, the screw portion may be a groove structure such as an inner hexagon groove, a triangular groove, etc. on the position-limiting flange 410.
In this embodiment, the suspender body 300 includes an ear plate end part 310 and a rod body 320 which are arranged up and down, the suspender ear plate 311 is disposed on the upper end of the ear plate end part 310, the rod body 320 extends up and down along the axial direction, the upper end of the rod body 320 is provided with a connection screw hole extending up and down along the axial direction, and the lower end of the ear plate end part 310 is provided with a connection end connected with the connection screw hole through threads.
The lower end of the boom body 300 is disposed at the lower side of the stiffening beam 30 and is provided with a connecting ball hinge connected to the stiffening beam 30. The lower end of the hanger rod main body 300 is connected with the connecting spherical hinge through an anchor head nut. The periphery of the connecting spherical hinge is provided with a protective cover, and the protective cover is filled with anti-corrosion grease to protect the connecting spherical hinge. The suspender main body is connected with the stiffening beam through the connecting spherical hinge, the horizontal bearing capacity, the vertical pulling force and the overall strength of the support are greatly improved compared with the common support, and the suspender has the characteristics of clear and definite mechanism, stable structural parameters, excellent damping performance and the like.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A short boom for a suspension bridge, characterized by: the method comprises the following steps: a cable clamp (100), a connector (200), and a boom body (300);
cable clamp (100), connecting piece (200) and jib main part (300) from top to bottom set gradually, connecting piece (200) are located between cable clamp (100) and jib main part (300), the upper and lower both ends of connecting piece (200) respectively with cable clamp (100) and jib main part (300) activity hinge joint, the articulated axis of cable clamp (100) and connecting piece (200) extends along the fore-and-aft direction, the articulated axis of connecting piece (200) and jib main part (300) extends along controlling the direction.
2. A short boom for a suspension bridge according to claim 1, characterized in that: the lower extreme of cable clamp (100) is equipped with cable clamp otic placode (110), the upper end of connecting piece (200) is equipped with and connects and hinge on otic placode (210), cable clamp otic placode (110) and connect and hinge on otic placode (210) all are equipped with first pinhole, two the axial of first pinhole extends and coaxial alignment along the fore-and-aft direction, two coaxial rotation wears to be equipped with hinge pin (400) in the first pinhole.
3. A short boom for a suspension bridge according to claim 2, characterized in that: the quantity of at least one in connecting hinge upper ear plate (210) and cable clamp ear plate (110) is the polylith, polylith connecting hinge upper ear plate (210) is interval arrangement setting around being, polylith cable clamp ear plate (110) is interval arrangement setting around being, cable clamp ear plate (110) are adjacent two inserting and locating connecting hinge upper ear plate (210) between and pass through articulated round pin (400) are articulated each other.
4. A short boom for a suspension bridge according to claim 2, characterized in that: the upper end of jib main part (300) is equipped with jib otic placode (311), the lower extreme of connecting piece (200) is equipped with under the connection hinge otic placode (220), jib otic placode (311) all are equipped with the second pinhole with under the connection hinge otic placode (220), the axial of second pinhole all extends and coaxial alignment, two along left right direction in the second pinhole coaxial rotation wears to be equipped with hinge pin (400).
5. A short boom for a suspension bridge according to claim 4, characterized in that: the utility model discloses a suspender, including jib otic placode (311) and connecting hinge, the quantity of at least one is the polylith in the lower otic placode (220) of jib, polylith the interval arrangement sets up about jib otic placode (311) is, polylith the interval arrangement sets up about connecting hinge lower otic placode (220) is, connecting hinge lower otic placode (220) is inserted and is located two between jib otic placode (311) and pass through articulated pin (400) are articulated each other.
6. A short boom for a suspension bridge according to claim 4, characterized in that: one end of the hinge pin (400) is provided with a limiting flange (410), the other end of the hinge pin is coaxially and threadedly provided with a connecting nut (420), and the limiting flange (410) is provided with a screwing part.
7. A short boom for a suspension bridge according to claim 4, characterized in that: jib main part (300) is including being otic placode end piece (310) and the body of rod (320) that sets up from top to bottom, jib otic placode (311) are located the upper end of otic placode end piece (310), the body of rod (320) is the axial and extends from top to bottom along, the upper end of the body of rod (320) is equipped with the connection screw that the axial extends along upper and lower direction, the lower extreme of otic placode end piece (310) be equipped with connection screw threaded connection's link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210425744.2A CN114922047A (en) | 2022-04-21 | 2022-04-21 | Short suspension rod for suspension bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210425744.2A CN114922047A (en) | 2022-04-21 | 2022-04-21 | Short suspension rod for suspension bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114922047A true CN114922047A (en) | 2022-08-19 |
Family
ID=82807296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210425744.2A Pending CN114922047A (en) | 2022-04-21 | 2022-04-21 | Short suspension rod for suspension bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114922047A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2595863Y (en) * | 2002-12-05 | 2003-12-31 | 柳州海威姆建筑机械有限公司 | Boom dragline device |
| JP2006096476A (en) * | 2004-09-28 | 2006-04-13 | Bbm:Kk | Hoisting accessory |
| CN202644404U (en) * | 2012-07-05 | 2013-01-02 | 中铁第四勘察设计院集团有限公司 | Combined rope clip of suspension bridge |
| CN105780641A (en) * | 2016-04-20 | 2016-07-20 | 广东和立土木工程有限公司 | Three-section hinging type arch bridge suspender system with rigid rods combined with flexible cable |
| CN106638264A (en) * | 2016-11-09 | 2017-05-10 | 深圳市市政设计研究院有限公司 | Rigid suspension rod connecting structure and bridge structure |
| CN107142846A (en) * | 2017-07-07 | 2017-09-08 | 江苏法尔胜缆索有限公司 | New spatial cable suspension rope bridge crane Cable Structure |
| CN206859057U (en) * | 2017-02-09 | 2018-01-09 | 江苏法尔胜缆索有限公司 | New spatial cable suspension rope bridge crane Cable Structure |
| CN207727413U (en) * | 2017-12-28 | 2018-08-14 | 江苏百崮钢结构工程有限公司 | A kind of self-control cable-stayed bridge sunpender anchorage |
| CN111851255A (en) * | 2020-08-28 | 2020-10-30 | 东南大学建筑设计研究院有限公司 | Large-span suspension bridge with replaceable main cable and main cable replacing method thereof |
| CN111893880A (en) * | 2020-07-27 | 2020-11-06 | 长江勘测规划设计研究有限责任公司 | Cable clamp structure of longitudinal and transverse bridge direction arbitrary swing sling system and construction method thereof |
| CN113026530A (en) * | 2020-12-31 | 2021-06-25 | 武汉鑫拓力工程技术有限公司 | Connecting structure of suspender and bridge |
| CN214530159U (en) * | 2020-12-31 | 2021-10-29 | 武汉鑫拓力工程技术有限公司 | Universal ear seat |
-
2022
- 2022-04-21 CN CN202210425744.2A patent/CN114922047A/en active Pending
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|---|---|---|---|---|
| CN2595863Y (en) * | 2002-12-05 | 2003-12-31 | 柳州海威姆建筑机械有限公司 | Boom dragline device |
| JP2006096476A (en) * | 2004-09-28 | 2006-04-13 | Bbm:Kk | Hoisting accessory |
| CN202644404U (en) * | 2012-07-05 | 2013-01-02 | 中铁第四勘察设计院集团有限公司 | Combined rope clip of suspension bridge |
| CN105780641A (en) * | 2016-04-20 | 2016-07-20 | 广东和立土木工程有限公司 | Three-section hinging type arch bridge suspender system with rigid rods combined with flexible cable |
| CN106638264A (en) * | 2016-11-09 | 2017-05-10 | 深圳市市政设计研究院有限公司 | Rigid suspension rod connecting structure and bridge structure |
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| CN113026530A (en) * | 2020-12-31 | 2021-06-25 | 武汉鑫拓力工程技术有限公司 | Connecting structure of suspender and bridge |
| CN214530159U (en) * | 2020-12-31 | 2021-10-29 | 武汉鑫拓力工程技术有限公司 | Universal ear seat |
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Application publication date: 20220819 |