CN111305041A - Multistage anti-impact energy-consumption bridge limiter - Google Patents
Multistage anti-impact energy-consumption bridge limiter Download PDFInfo
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- CN111305041A CN111305041A CN202010128763.XA CN202010128763A CN111305041A CN 111305041 A CN111305041 A CN 111305041A CN 202010128763 A CN202010128763 A CN 202010128763A CN 111305041 A CN111305041 A CN 111305041A
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- 238000005265 energy consumption Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 230000008719 thickening Effects 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 230000035939 shock Effects 0.000 claims abstract description 10
- 239000006096 absorbing agent Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 16
- 238000013016 damping Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a multi-stage anti-impact energy-consumption bridge limiter, which relates to the field of bridge earthquake resistance and comprises a connecting rod, a return spring and a cylinder body; the cylinder body is arranged on the connecting groove steel seat, and a gas compensation cavity and shear thickening liquid are arranged in the cylinder body, wherein the gas compensation cavity and the shear thickening liquid are distributed to respectively occupy the left end and the right end of the cylinder body; the return spring penetrates through the gas compensation cavity, one end of the return spring is arranged on a cylinder cover of the cylinder body, the other end of the return spring is arranged on a piston rod, the piston rod is arranged on a connecting rod, and the connecting rod extends out of the cylinder body; the piston rod is arranged in the shear thickening liquid. Compared with the traditional bridge limiter, the limiting device overcomes the defect of single limiting mode of the traditional bridge limiter, the limiting devices are arranged on the two sides of the shock isolator, the cylinder body of the shock isolator is filled with shear thickening liquid, the piston rod moves in the cylinder body under the impact load to generate a shear thickening effect, and the shock isolator has the functions of impact resistance and energy consumption.
Description
Technical Field
The invention mainly relates to the field of bridge earthquake resistance, and relates to a multistage-force-output impact-resistant energy-consumption bridge limiter for limiting a bridge based on a shear thickening material.
Background
In recent years, the frequency of vehicle accidents and earthquakes has had a serious impact on humans, particularly on bridges. In order to deal with the adverse effects of vehicle accidents and earthquakes on bridges, the problem of how to consume and disperse the energy of the impact of vehicles and earthquakes on bridges is gradually emphasized. In response to the problem of protecting bridges, bridge stoppers play an important role.
For traditional bridge stopper, spacing principle and mode are single, can't deal with some large-scale freight train striking bridges and high intensity earthquake, can't be fine the safety of assurance bridge.
Shear Thickening Fluid (STF) is a new type of shock and energy resistant fluid, the properties of which are controlled only by the shear rate, and which exhibits solid-like properties when the shear rate exceeds the critical shear rate of the material. Therefore, the characteristics of the materials are combined, and the multi-stage force output impact-resistant energy-consuming bridge limiter is provided.
In the current domestic patents, shear thickening fluids are rarely used in bridge limiters. The 'bidirectional decoupling limiter and bridge structure provided with the same' disclosed in the Chinese patent application No. 201910407248.2 can achieve the purpose of limiting the bridge, but cannot achieve impact resistance and energy consumption. The Chinese patent application No. 201510415496.3 discloses a displacement spring limiter for pier top of high pier bridge, which can realize bridge limitation, but can not effectively consume energy.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a multi-stage anti-impact energy-consumption bridge limiter, which overcomes the defect of single limiting mode of the traditional bridge limiter. Compared with the conventional bridge limiter, the shear thickening liquid is filled in the cylinder body, so that the anti-impact effect is strong; the arc baffle and the piston rod are in double connection by the spring and the hinged steel sheets, the compression amount of the high-rigidity spring and the hinged steel sheets on two sides is gradually increased along with the increase of the displacement of the piston rod, and meanwhile, the gap between the rotating mandrel and the cylinder body is reduced, so that the limiting device has the function of multi-stage force application and can adapt to different impact loads.
The invention is realized by the following technical scheme:
a multi-stage anti-impact energy-consumption bridge limiter comprises a connecting rod, a return spring and a cylinder body; the cylinder body is arranged on the connecting groove steel seat, and a gas compensation cavity and shear thickening liquid are arranged in the cylinder body, wherein the gas compensation cavity and the shear thickening liquid are distributed to respectively occupy the left end and the right end of the cylinder body; the return spring penetrates through the gas compensation cavity, one end of the return spring is arranged on a cylinder cover of the cylinder body, the other end of the return spring is arranged on a piston rod, the piston rod is arranged on a connecting rod, and the connecting rod extends out of the cylinder body; the piston rod is arranged in the shear thickening liquid.
Further, an arc-shaped baffle is further mounted on the connecting rod and can slide along the connecting rod; and a high-rigidity spring is arranged between the arc-shaped baffle and the piston rod.
Furthermore, a rotating mandrel is arranged between the arc-shaped baffle and the piston rod and is connected through a steel sheet, and the rotating mandrel is arranged on an outer ring of the high-rigidity spring.
Further, the cylinder cover on one side of the cylinder body is of an arc-shaped structure, and the arc-shaped structure is similar to the arc of the arc-shaped baffle.
Furthermore, floating pistons are vertically arranged at two ends of the rotating mandrel and can be attached to the inner wall of the cylinder body.
Furthermore, a trapezoidal baffle is arranged at one end of the connecting rod extending out of the cylinder body.
Furthermore, two cylinder covers of the cylinder body are connected through a pull rod.
Further, be provided with the rubber circle between connecting rod and the cylinder cap, the connecting rod passes connecting steel groove seat and both contact positions are provided with the sealing washer.
Further, the periphery of the cylinder body is fixedly arranged on a pier through an L-shaped baffle, a main beam is arranged right above the pier, a shock absorber is arranged between the pier and the main beam, and the shock absorber is connected with the pier and the main beam.
Further, the terminal surface is provided with the triangle-shaped steel sheet through the bolt under the girder, is provided with the cylinder body under the triangle-shaped steel sheet, and cylinder body and triangle-shaped steel sheet contactless, trapezoidal baffle is higher than the cylinder body, and when the girder took place shear motion under the effect of external force, triangle-shaped steel sheet and trapezoidal baffle extruded each other to slow down the further deformation of girder.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a multi-stage force output impact-resistant energy-consuming bridge limiter, aiming at the problem that a conventional bridge limiter cannot resist impact and consume energy. Under the impact load, the piston rod moves in the cylinder body to generate a shear thickening effect, so that the high impact resistance is provided, and the high energy consumption capacity is realized.
2. Aiming at the problem that the conventional bridge stopper cannot adapt to different impact loads, the arc-shaped baffle plate and the piston rod are in double connection by adopting a high-rigidity spring and a hinged steel sheet. When the arc baffle contacts the cylinder body, along with the increase of the displacement of the connecting rod, the piston rod extrudes the high-rigidity spring and the steel sheets hinged to the two sides, the gap between the rotating mandrel and the cylinder body is reduced, the damping force is larger, the limiting device has the function of multi-stage output, and the limiting device can adapt to different impact loads.
3. Aiming at the problem that the stress area of the conventional bridge stopper is too small, the arc cylinder body is arranged to increase the stress area, the shearing force is dispersed in a larger range, and the safety of the structure is improved.
Drawings
FIG. 1 is a schematic view of a multi-stage impact-resistant energy-consuming bridge limiter according to the present invention;
FIG. 2 is a schematic illustration of the present invention in FIG. 1 in an operational state;
FIG. 3 is a schematic view of a multi-stage impact-resistant energy-consuming bridge limiter according to the present invention;
FIG. 4 is a schematic view of the operating state of FIG. 3;
FIG. 5 is an internal schematic view of FIG. 3;
FIG. 6 is a schematic structural view of a connecting steel groove seat according to the present invention shown in FIG. 3;
fig. 7 is a schematic structural diagram of the L-shaped baffle in fig. 1 or fig. 2 according to the present invention.
The reference numbers are as follows:
1-trapezoidal steel plate; 2-triangular steel plate; 3-L-shaped baffle plates; 4-arc baffle; 5-a return spring; 6-rubber ring; 7-rotating the mandrel; 8-high stiffness spring; 9-a piston rod; 10-a main beam; 11-a vibration isolator; 12-bridge pier; 13-a bolt; 14-Shear Thickening Fluid (STF); 15-gas compensation chamber; 16-steel sheet; 17-connecting the steel groove seat; 18-cylinder body; 19-a sealing ring; 20-a connecting rod; 21-a floating piston; 22-a pull rod.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following first describes in detail embodiments according to the present invention with reference to the accompanying drawings
With reference to the attached drawings 1-7, the invention provides a multi-stage anti-impact energy-consumption bridge limiter, which comprises a trapezoidal steel plate 1, a triangular steel plate 2, an L-shaped steel baffle 3, an arc baffle 4, a return spring 5, a rubber ring 6, a rotating mandrel 7, a high-rigidity spring 8, a piston rod 9, a main beam 10, a shock isolator 11, a bridge pier 12, a bolt 13, shear thickening fluid STF14, a gas compensation cavity 15, a steel sheet 16, a connecting steel groove seat 17, a cylinder body 18, a sealing ring 19, a connecting rod 20, a floating piston 21 and a pull rod 22; the triangular steel plate 2 is fixed on the main beam 10 through bolts, and the L-shaped baffle 3 is welded with the connecting steel groove seat 17 and is fixed on the pier 12 through bolts 13. The trapezoidal steel plate 1 is welded with a connecting rod 20, and the cylinder body 18 is fixed in the connecting steel groove 17. Under the impact load, the main beam 10 and the pier 12 generate relative displacement, the triangular steel plate 2 and the trapezoidal steel plate 1 collide with each other, the connecting rod 20 is pushed to move in the cylinder body 18 to generate a shear thickening effect, and the shock-resistant and energy-consuming effects are achieved. The front part of the piston rod 9 is provided with a high-rigidity spring 8 and a rotating mandrel 7, different compression amounts of the high-rigidity spring 8 are obtained according to the impact load, the compression amount of the connecting steel sheet 16 is further changed, the gap width between the cylinder body 18 and the rotating mandrel 7 is further changed, and the function of multi-stage force output of the stopper is realized, so that the stopper can adapt to different impact loads.
An upper steel plate of the L-shaped baffle 3 is connected with a main beam 10 through a bolt 13, the trapezoidal steel plate 1 is welded with a connecting rod 20, a front cylinder cover and a rear cylinder cover are connected through a pull rod 22, and a cylinder body 18 is fixed on a pier 12 through a connecting steel groove seat 17. When the main beam 10 generates large displacement under impact load, the L-shaped baffle 3 pushes the trapezoidal steel plate 1 to enable the connecting rod 20 to move in the cylinder body 18, and the piston rod 9 is driven to move in the shear thickening liquid 14 to generate a shear thickening effect, so that the shear thickening device has the functions of resisting impact and consuming energy. When the main beam 10 and the pier 12 generate relative displacement under impact load, the arc baffle 4 does not contact the arc end cover of the cylinder 18, the high-stiffness spring 8 does not reach the maximum compression amount, the gap for pushing the steel sheet 16 to compress is small, the gap between the rotating spindle 7 and the cylinder 18 is basically unchanged, meanwhile, the floating piston 21 and the cylinder 18 are completely attached to close the gaps on the two sides, the upper gap and the lower gap between the rotating spindle 7 and the cylinder 18 are the total gap, and finally, the damping force generated between the rotating spindle 7 and the cylinder 18 is small. When the displacement is increased continuously, the high-rigidity spring 8 is compressed, the steel sheet 16 connected with the rotating mandrel 7 is compressed, the gap between the rotating mandrel 7 and the cylinder 18 is reduced gradually, the damping force is increased gradually, and the function of limiting the bridge by multi-stage force is realized.
The working principle is as follows: when an earthquake occurs, the main beam 10 and the pier 12 are relatively displaced, the triangular steel plate 2 connected with the lower end face of the main beam 10 is displaced leftwards or rightwards, the displacement is assumed to be displaced rightwards, the displacement of the triangular steel plate 2 and the trapezoidal steel plate 1 is gradually increased, and the triangular steel plate 2 is not in contact with the trapezoidal steel plate 1. When the displacement increases to triangle-shaped steel sheet 2 and trapezoidal steel sheet 1 contact, triangle-shaped steel sheet 2 promotes trapezoidal steel sheet 1 and shifts right, drives connecting rod 20, piston rod 9 and shifts right simultaneously.
When the displacement is small, namely the arc baffle 4 is not contacted with the cylinder body 18, the stretching amount of the return spring 5 is gradually increased, the compression amount of the high-rigidity spring 8 is small, the energy is consumed by the shear thickening effect generated when the piston rod 9 displaces, and the damping force is small at the moment.
When the displacement is large, namely the arc baffle 4 is in contact with the cylinder body 18, the stretching amount of the reset spring 5 is continuously increased, the piston rod 9 extrudes the high-rigidity spring 8 to enable the steel sheet 16 connected with the rotating mandrel 7 to be compressed, the distance between the rotating mandrel 7 and the cylinder body 18 is gradually reduced, the damping force is gradually increased, and the function of limiting the bridge by multiple levels of force is realized.
When the displacement is increased to the maximum, the arc baffle 4 is in contact with the cylinder body 18, the high-rigidity spring 8 is compressed to the minimum, the return spring 5 is stretched to the maximum, and the arc cylinder body 18 disperses the shearing force to play a limiting role. After the earthquake is finished, the piston rod 9 is gradually reset by the reset spring 5 so as to deal with the next earthquake.
The working principle is as follows: according to the invention, the cylinder body is fixed on the pier through the connecting steel groove, and when the relative displacement generated by the main beam and the pier under an impact load is overlarge, the piston rod can be driven to move in the cylinder body, so that the effects of resisting impact and dissipating energy are achieved. When the main beam and the pier generate relative displacement under impact load, the arc baffle does not contact the cylinder body, the high-rigidity spring does not reach the maximum compression amount, the gap for pushing the steel sheet to compress is small, the gap between the rotating mandrel and the cylinder body is basically unchanged, and the generated damping force is small. When the displacement continues to increase, the high-rigidity spring is compressed, the steel sheet connected with the rotating mandrel is compressed, the gap between the rotating mandrel and the cylinder body is gradually reduced, the damping force is gradually increased, the function of limiting the bridge and outputting force in multiple stages is realized, and the device can adapt to different impact loads
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A multi-stage anti-impact energy-consumption bridge limiter is characterized by comprising a connecting rod (20), a return spring (5) and a cylinder body (18); the cylinder body (18) is arranged on the connecting groove steel seat (17), a gas compensation cavity (15) and shear thickening liquid (14) are arranged in the cylinder body (18), wherein the gas compensation cavity (15) and the shear thickening liquid (14) are distributed to respectively occupy the left end and the right end in the cylinder body (18); the return spring (5) penetrates through the gas compensation cavity (15), one end of the return spring (5) is arranged on a cylinder cover of the cylinder body (18), the other end of the return spring is arranged on the piston rod (9), the piston rod (9) is arranged on the connecting rod (20), and the connecting rod (20) extends out of the cylinder body (18); the piston rod (9) is arranged in the shear thickening liquid (14).
2. The multi-stage impact-resistant energy-consuming bridge limiter according to claim 1, wherein the connecting rod (20) is further provided with an arc-shaped baffle (4), and the arc-shaped baffle (4) can slide along the connecting rod (20); and a high-rigidity spring (8) is arranged between the arc-shaped baffle (4) and the piston rod (9).
3. The multi-stage impact-resistant energy-consuming bridge limiter according to claim 2, wherein a rotating mandrel (7) is further arranged between the arc-shaped baffle (4) and the piston rod (9), the rotating mandrel (7) is connected through a steel sheet (16), and the rotating mandrel (7) is arranged at the outer ring of the high-stiffness spring (8).
4. The multi-stage impact-resistant energy-consuming bridge limiter according to claim 2, wherein the cylinder cover on one side of the cylinder body (18) is of an arc-shaped structure, and the arc-shaped structure is similar to the arc shape of the arc-shaped baffle (4).
5. The multi-stage impact-resistant energy-consuming bridge limiter according to claim 3, wherein floating pistons (21) are vertically arranged at both ends of the rotating mandrel (7), and the floating pistons (21) can be attached to the inner wall of the cylinder body (18).
6. The multi-stage impact-resistant energy-consuming bridge limiter according to claim 1, wherein a trapezoidal baffle (1) is provided at the end of the connecting rod (20) extending out of the cylinder body (18).
7. The multi-stage impact-resistant energy-dissipating bridge limiter according to claim 1, wherein the two cylinder heads of the cylinder block (18) are connected by a tie rod (22).
8. The multi-stage impact-resistant energy-consuming bridge limiter according to claim 1, wherein a rubber ring (6) is arranged between the connecting rod (20) and the cylinder cover, the connecting rod (20) penetrates through the connecting steel groove seat (17), and a sealing ring (19) is arranged at the contact position of the connecting rod and the connecting steel groove seat.
9. The multi-stage impact-resistant energy-consuming bridge limiter according to any one of claims 1 to 8, wherein the periphery of the cylinder (19) is fixedly arranged on a bridge pier (12) through an L-shaped baffle (3), a main beam (10) is arranged right above the bridge pier (12), a shock absorber (11) is arranged between the bridge pier (12) and the main beam (10), and the shock absorber (11) is connected with both the bridge pier (12) and the main beam (10).
10. The multi-stage impact-resistant energy-consuming bridge limiter according to claim 9, wherein a triangular steel plate (2) is arranged on the lower end face of the main beam (10) through a bolt (13), a cylinder body (18) is arranged right below the triangular steel plate (2), the cylinder body (18) is not in contact with the triangular steel plate (2), the trapezoidal baffle (1) is higher than the cylinder body (18), and when the main beam (10) is subjected to shearing movement under the action of external force, the triangular steel plate (2) and the trapezoidal baffle (1) are mutually extruded, so that further deformation of the main beam (10) is slowed down.
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| CN202010128763.XA CN111305041B (en) | 2020-02-28 | 2020-02-28 | Multistage anti-impact energy-consumption bridge limiter |
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| CN202010128763.XA CN111305041B (en) | 2020-02-28 | 2020-02-28 | Multistage anti-impact energy-consumption bridge limiter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096165A (en) * | 2020-08-24 | 2020-12-18 | 福建龙岩方圆水泥制品有限公司 | Anticorrosive cement pole that structure is firm |
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| US5349712A (en) * | 1991-11-07 | 1994-09-27 | Public Works Research Institute, Ministry Of Construction | Variable damper for bridges and bridge |
| CN101994775A (en) * | 2010-10-28 | 2011-03-30 | 广州大学 | Composite damping single-piston rod viscous damper |
| CN201884543U (en) * | 2010-10-28 | 2011-06-29 | 广州大学 | Elastic viscous damper with single piston rod |
| CN106641084A (en) * | 2017-02-21 | 2017-05-10 | 沈阳建筑大学 | Single-piston-rod damper |
| CN106702882A (en) * | 2015-11-12 | 2017-05-24 | 华南理工大学 | Hydraulic force distribution buffering device |
| CN107939897A (en) * | 2017-11-21 | 2018-04-20 | 东北大学 | A kind of method and damper of the adjustable speed limit of shear thickening damper |
| CN110130207A (en) * | 2019-05-16 | 2019-08-16 | 山东省交通规划设计院 | A kind of two-way decoupling limiter and the bridge structure for installing the limiter |
-
2020
- 2020-02-28 CN CN202010128763.XA patent/CN111305041B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5349712A (en) * | 1991-11-07 | 1994-09-27 | Public Works Research Institute, Ministry Of Construction | Variable damper for bridges and bridge |
| CN101994775A (en) * | 2010-10-28 | 2011-03-30 | 广州大学 | Composite damping single-piston rod viscous damper |
| CN201884543U (en) * | 2010-10-28 | 2011-06-29 | 广州大学 | Elastic viscous damper with single piston rod |
| CN106702882A (en) * | 2015-11-12 | 2017-05-24 | 华南理工大学 | Hydraulic force distribution buffering device |
| CN106641084A (en) * | 2017-02-21 | 2017-05-10 | 沈阳建筑大学 | Single-piston-rod damper |
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| CN112096165A (en) * | 2020-08-24 | 2020-12-18 | 福建龙岩方圆水泥制品有限公司 | Anticorrosive cement pole that structure is firm |
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Effective date of registration: 20240529 Address after: 230000 b-1018, Woye Garden commercial office building, 81 Ganquan Road, Shushan District, Hefei City, Anhui Province Patentee after: HEFEI WISDOM DRAGON MACHINERY DESIGN Co.,Ltd. Country or region after: China Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: JIANGSU University Country or region before: China |