CN214531260U - Disconnect-type shock isolation device - Google Patents
Disconnect-type shock isolation device Download PDFInfo
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- CN214531260U CN214531260U CN202120417826.3U CN202120417826U CN214531260U CN 214531260 U CN214531260 U CN 214531260U CN 202120417826 U CN202120417826 U CN 202120417826U CN 214531260 U CN214531260 U CN 214531260U
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- 238000002955 isolation Methods 0.000 title claims abstract description 29
- 230000035939 shock Effects 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 89
- 239000010959 steel Substances 0.000 claims abstract description 89
- 238000013016 damping Methods 0.000 claims abstract description 83
- 229920001971 elastomer Polymers 0.000 claims abstract description 60
- 239000000806 elastomer Substances 0.000 claims abstract description 44
- 229920003225 polyurethane elastomer Polymers 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 11
- -1 polytetrafluoroethylene Polymers 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- 239000013013 elastic material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 12
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
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- 238000009413 insulation Methods 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
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- 238000012545 processing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 3
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- 229920006362 Teflon® Polymers 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
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Abstract
The utility model discloses a disconnect-type shock isolation device, including outer connecting steel plate, vertical core device, cydariform damping elastomer. The vertical bearing capacity is mainly provided by a vertical core device mainly made of a polyurethane elastomer, one end of the vertical core device is restrained, and the other end of the vertical core device allows sliding friction; the horizontal force is mainly born by the drum-shaped damping elastomer, and the bearing forces in two directions are separately processed, so that the device has good shock-proof performance, realizes shock absorption of an engineering structure and meets the requirements of high bearing, large deformation and high damping; and can adopt the connected mode of pin-connected panel, separately process each part of seismic isolation device according to the design demand, then make up fast and assemble, but wholly realize the assemblization.
Description
Technical Field
The utility model belongs to the technical field of the engineering damping, concretely relates to disconnect-type shock isolation device.
Background
In the current engineering damping field, common vibration isolation bearings mainly comprise natural laminated rubber bearings, high-damping rubber bearings, sliding friction bearings and the like.
The structure of a prior art natural laminated rubber mount is shown in fig. 1. The laminated rubber support is formed by embedding a plurality of steel plates 1 in rubber 2 in a distributed manner, and the upper surface and the lower surface of each steel plate are all rubber layers. The greatest disadvantage of natural rubber is its high hardness and low damping. Therefore, when large deformation occurs, large tensile force can be generated to damage the material, and meanwhile, the energy consumption effect is poor due to small damping, so that the effect of reducing the earthquake input energy cannot be achieved.
The structure of a prior art high damping rubber mount is shown in fig. 2. The high-damping rubber support body is composed of a high-damping rubber elastomer 6, a middle stiffening steel plate 7, an upper support steel plate 5 and a lower support steel plate 5, wherein the upper support steel plate 5 and the lower support steel plate 5 are respectively connected with an embedded steel plate 4 in a bridge structure through a sleeve 1 and an anchoring bolt 3. The support body is connected with the upper steel plate and the lower steel plate through connecting bolts 2. Although the high-damping rubber support has a good horizontal shock insulation effect, the high-damping rubber support is complex in production process, low in bearing capacity and poor in ultimate deformation capacity, and the requirements for bearing capacity and horizontal deformation are difficult to meet in some major projects.
FIG. 3 is a schematic structural diagram of a high-bearing-capacity support according to CN108894102A in the prior art, which includes an outer connecting steel plate, an inner connecting steel plate, a stiffening steel plate, and an elastomer, wherein the elastomer and the stiffening steel plate are arranged between the two inner connecting steel plates in an overlapping manner, and the two inner connecting steel plates are respectively fixedly connected with the corresponding outer connecting steel plates; the elastic washers are arranged among the stiffening steel plates and between the stiffening steel plates and the inner connecting steel plates; the inner connecting steel plate, the stiffening steel plate and the elastic washer are all provided with positioning holes for positioning and mounting the inner connecting steel plate, the stiffening steel plate and the elastic washer; the gaps among the inner connecting steel plate, the stiffening steel plate and the elastic washer are provided with elastomers, and the positioning holes of the inner connecting steel plate, the stiffening steel plate and the elastic washer are provided with elastomers. The shock insulation support can effectively realize shock absorption and high bearing capacity of structures such as bridges, but mainly focuses on vertical bearing capacity, and is difficult to meet the requirement of horizontal deformation in some major projects.
Although the friction sliding shock insulation technology has long-term research and unique superiority compared with other shock insulation systems, the friction sliding shock insulation technology also has great limitation. Most of the conventional friction sliding shock insulation supports have the defects of high temperature non-wear resistance, unstable friction coefficient and the like, and after an earthquake, the performance of most of the friction sliding supports can be changed, so that the problems of repairing, maintaining or replacing the friction sliding supports after the earthquake exist. On the other hand, the friction sliding support has certain difference compared with a rubber support and a lead rubber support in performance stability, safety and reliability and economic price.
SUMMERY OF THE UTILITY MODEL
At least one in defect or improvement demand more than prior art, the utility model provides a disconnect-type shock isolation device, including outer connecting steel plate, vertical core device, cydariform damping elastomer. The vertical bearing capacity is mainly provided by a vertical core device mainly made of a polyurethane elastomer, one end of the vertical core device is restrained, and the other end of the vertical core device allows sliding friction; the horizontal force is mainly born by the drum-shaped damping elastomer, and the bearing forces in two directions are separately processed, so that the device has good shock-proof performance, realizes shock absorption of an engineering structure and meets the requirements of high bearing, large deformation and high damping; and can adopt the connected mode of pin-connected panel, separately process each part of seismic isolation device according to the design demand, then make up fast and assemble, but wholly realize the assemblization.
In order to achieve the above object, according to one aspect of the present invention, there is provided a split-type seismic isolation apparatus, comprising a vertical core device and a plurality of drum-shaped damping elastomers around the vertical core device between external connection steel plates;
the outer connecting steel plate comprises a first connecting steel plate and a second connecting steel plate;
the vertical core device comprises an inner connecting plate, a plurality of layers of stiffening steel plates and a polyurethane elastomer, the polyurethane elastomer is filled in gaps and the periphery between the inner connecting plate and the stiffening steel plates, the inner connecting plate at one end is fixed with the first connecting steel plate, and the end face of the polyurethane elastomer at the other end and a friction plate-shaped body embedded in the second connecting steel plate form a sliding friction pair;
the drum-shaped damping elastic body is in a column shape with a side wall bulging outwards to form an arc surface, and the upper end and the lower end of the drum-shaped damping elastic body are fixedly connected between the first connecting steel plate and the second connecting steel plate.
Preferably, the drum-shaped damping elastomer comprises upper and lower sealing plates, a plurality of layers of stiffening steel plates and a damping elastic material;
damping elastic materials are filled in the gaps and the peripheries between the sealing plates and the stiffening steel plates; the closing plate is fixedly connected with the first connecting steel plate and the second connecting steel plate.
Preferably, the friction plate-shaped body is a polytetrafluoroethylene plate.
Preferably, the friction plate-shaped body has a surface higher than an inner surface of the second connection steel plate.
Preferably, the friction plate-like body is circular.
Preferably, the friction plate-like body has an outer diameter greater than an outer diameter of the vertical core means.
Preferably, an edge of the friction plate-shaped body is pressed between the drum damping elastic body and the second connection steel plate.
Preferably, the radius of the arc line of the drum-shaped damping elastomer bulging in the vertical section is 100 mm and 200 mm.
Preferably, in the drum-shaped damping elastomer, the width of the stiffening steel plate is larger than that of the sealing plate.
Preferably, the outer connecting steel plate, the vertical core device and the drum-shaped damping elastomer are connected in a combined assembly mode.
Specifically, the utility model provides a disconnect-type shock isolation device, including outer connecting steel plate, vertical core device, cydariform damping elastomer three. The vertical bearing capacity is mainly provided by a vertical core device mainly made of polyurethane elastomer, the hardness can reach Shore 99 degrees, and the friction performance is excellent; the horizontal force is mainly borne by the drum-shaped damping elastic body, the drum-shaped damping elastic body is made of a high-damping material with low shear modulus, the damping ratio can reach more than 30%, the shear modulus is only about 0.2Mpa, the drum-shaped damping elastic body has a good energy consumption effect, small tensile force is generated when large deformation occurs, the drum-shaped appearance of the drum-shaped damping elastic body is obtained according to tensile simulation analysis, and the elastic body cannot be obviously necked when being tensioned, so that the phenomenon of cracking of the damping material cannot be generated.
The vertical core device comprises an inner connecting plate, a stiffening steel plate and a polyurethane elastomer, wherein gaps between the inner connecting steel plate and the stiffening steel plate are made of the polyurethane elastomer (preferably adopting the polyurethane elastomer in CN 108894102A). The drum-shaped damping elastomer is composed of sealing plates, stiffening steel plates and low-modulus high-damping elastomers, an inner connecting plate and a drum-shaped elastomer sealing plate of the vertical core device are fixedly connected with an outer connecting plate through corresponding inner hexagon bolts respectively, polytetrafluoroethylene plates are embedded in the outer connecting plate through lower connecting steel plates, and the drum-shaped elastomer is evenly arranged at four corners of the outer connecting steel plates. The device gives full play to the assembly performance of each part of the device based on the mechanical properties of polyurethane materials and high-damping materials and the friction performance of surface high polymer materials, has simpler structure, cooperative deformation, convenient processing and wide application range in engineering.
The gap filling elastomer between the internal connecting steel plate and the stiffening steel plate in the vertical core device is a polyurethane elastomer, and has high bearing and friction-resistant mechanical properties. The lower surface of the polytetrafluoroethylene plate is a smooth polyurethane elastomer and is arranged in the center of the polytetrafluoroethylene plate in the horizontal direction.
The above-described preferred features may be combined with each other as long as they do not conflict with each other.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, has following beneficial effect:
1. the utility model discloses a disconnect-type shock isolation device has combined the horizontal advantage that the isolation bearing friction power consumption that slides, and good stability and the reply ability of stromatolite rubber support recycle polyurethane material bearing capacity is strong, hardness is high, frictional property is excellent characteristics, provides vertical load, and one end restraint, the other end allow sliding friction, bear the horizontal force through drum-shaped damping elastomer all around, do the disconnect-type with the load of two directions and handle, make the device have good shock insulation performance.
2. The utility model discloses a disconnect-type shock isolation device, cydariform damping elastomer appearance is the preferred 150 mm's of radius cydariform, and such appearance not only can increase the shearing force of cydariform damping elastomer, can also make its tensile stress of guaranteeing each part as far as possible when pulling even, avoids taking place obvious necking down when pulling and leads to the material fracture. And the stiffening steel plates can also avoid necking when the material is pulled.
3. The utility model discloses a disconnect-type shock isolation device, cydariform damping elastomer have the damping height, and shear modulus is low characteristics, and its limit shear deformation is more than or equal to 600%, and the damping ratio can reach 30%, and shear modulus then only has 0.2 MPA. When an earthquake occurs, large deformation can be generated, excessive tension is not generated, and high damping is utilized to dissipate energy.
4. The utility model discloses a disconnect-type shock isolation device, each part can all parts separately processing, stores separately, then the fast combination is assembled, wholly realizes the technology that can assemble. Meanwhile, the mechanical properties such as horizontal equivalent stiffness, damping ratio and the like of the shock isolation device can be changed by combining drum-shaped rubber elastomers with different quantities and sizes. Has the characteristics of simple structure, quick processing, large-scale storage, wide applicability and the like.
Drawings
FIG. 1 is a schematic structural view of a prior art natural laminated rubber mount;
FIG. 2 is a schematic structural view of a high damping mount of the prior art;
FIG. 3 is a schematic structural view of a high load bearing pedestal of the prior art;
FIG. 4 is a schematic structural view of the split-type vibration isolator of the present invention;
FIG. 5 is a schematic top view of FIG. 4;
FIG. 6 is a cross-sectional view of the vertical core device of FIG. 4;
FIG. 7 is a cross-sectional view of the drum damping elastomer of FIG. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to the following embodiments.
As a preferred embodiment of the present invention, as shown in fig. 4-7, the present invention provides a novel split type shock isolation apparatus, which mainly comprises three parts: the device comprises an outer connecting steel plate (an upper connecting steel plate 1 and a lower connecting steel plate 2), a vertical core device 3 and a drum-shaped damping elastomer 4.
As shown in fig. 4-5, a first connection hole 11 of the vertical core device 3 is formed in the middle of the upper connection steel plate 1, and second connection holes 10 for connecting the drum-shaped damping elastic bodies 4 are formed in the four corners of the upper connection steel plate; a polytetrafluoroethylene plate 5 is embedded in the middle of the lower connecting plate 2, and second connecting hole sites 10 for connecting the drum-shaped damping elastic bodies are arranged at the four corners of the lower connecting plate.
The upper surface of the vertical core device is provided with an inner connecting plate 6 which corresponds to the hole position of the upper connecting steel plate and is connected by an inner hexagon bolt of M16. Vulcanized sealing plates 9 are arranged on the upper surface and the lower surface of the four drum-shaped damping elastic bodies 4, the drum-shaped damping elastic bodies are arranged at four corners of the external connecting steel plate, and screw holes 13 of the sealing plates correspond to hole positions of the external connecting steel plate and are connected through M16 hexagon socket head cap screw bolts.
As shown in fig. 6, the vertical core device 3 is composed of an inner connecting plate 6, a first stiffening steel plate 7 and a polyurethane elastomer 8, the lower surface of the vertical core device is the smooth polyurethane elastomer 8, the friction coefficient with the teflon plate is stabilized below 0.03 under the designed bearing capacity, and the vertical core device is horizontally arranged at the center of the teflon plate 5 to form a slip layer. The tetrafluoroethylene plate 5 inlaid in the lower connecting plate is designed to be 7mm thick, the surface of the tetrafluoroethylene plate is slightly higher than the inner surface of the lower connecting steel plate, the arch camber damage caused by high-pressure stress is prevented, earthquake motion is carried out on all sides, and therefore the tetrafluoroethylene plate is designed to be circular in size to correspond to friction sliding in all directions.
As shown in fig. 7, between the upper and lower cover plates 9 of the drum damping elastomer is a high damping material 14, and a second stiffening steel plate 12 is provided in the high damping material 14. The drum profile is designed to have a radius of 150mm camber line in order to increase the shear of the drum damping elastomer and to prevent intermediate tensile failure due to necking from tensile stress concentrations.
The utility model discloses a theory of operation: under the condition that the structure is normally used, the vertical core device can slide in a short path, consumes energy through friction with a polytetrafluoroethylene plate, simultaneously drives the drum-shaped damping elastomer element to generate horizontal shearing and small deformation to generate restoring force to enable the shock insulation device to recover the original shape, and can generate small deformation with initial rigidity to dissipate certain energy. When an earthquake occurs, the shock insulation device generates large displacement, and the synergistic effect of friction energy consumption of a sliding layer and large shear deformation energy consumption of the drum-shaped damping elastomer plays a role in shock absorption and energy consumption. The drum-shaped damping elastomer element generates large shear deformation and shear restoring force at the same time, limits the sliding displacement of the vertical core device, and restores the shock insulation device to the original position after earthquake.
The utility model discloses a disconnect-type shock isolation device has following advantage:
the drum-shaped damping elastomer is stable in deformation. The drum-shaped damping elastomer is drum-shaped, the radian size of the drum-shaped damping elastomer is obtained by a stretch simulation analysis, the shearing capacity of the drum-shaped damping elastomer can be fully improved, and meanwhile, obvious necking can not occur when the drum-shaped damping elastomer is pulled, so that the damping material is prevented from cracking. The embedded stiffening steel plate well improves the stress characteristic and can effectively avoid necking at the same time.
The drum-shaped damping elastomer has large deformation and strong damping energy consumption capability. The drum-shaped elastomer is made of high-damping material, and has a small shear modulus of only 0.2 MPa. While the maximum shear deformation which can be produced is over 600%, the internal force produced by the material is still controlled at a low level. Meanwhile, the material has high damping, the equivalent damping ratio of the material reaches more than 30% when 300% deformation occurs, and energy dissipation can be fully performed when an earthquake occurs.
Simple structure, fast processing, large-scale storage and wide applicability. Each part can be separately processed and stored, and then quickly combined and assembled, so that an assemblable process is realized. The mechanical properties such as horizontal equivalent stiffness, damping ratio and the like of the shock isolation device can be changed by combining drum-shaped damping elastomers with different quantities and sizes.
It will be appreciated that the embodiments of the system described above are merely illustrative, in that elements illustrated as separate components may or may not be physically separate, may be located in one place, or may be distributed over different network elements. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In addition, it should be understood by those skilled in the art that in the specification of the embodiments of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the embodiments of the present invention, a large number of specific details are explained. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects.
However, the disclosed method should not be interpreted as reflecting an intention that: rather, the claimed embodiments of the invention require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of an embodiment of this invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and not to limit the same; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A disconnect-type shock isolation device which characterized in that: the damping device comprises vertical core devices and a plurality of drum-shaped damping elastic bodies, wherein the vertical core devices are arranged between external connecting steel plates and in the middle of the external connecting steel plates;
the outer connecting steel plate comprises a first connecting steel plate and a second connecting steel plate;
the vertical core device comprises an inner connecting plate, a plurality of layers of stiffening steel plates and a polyurethane elastomer, the polyurethane elastomer is filled in gaps and the periphery between the inner connecting plate and the stiffening steel plates, the inner connecting plate at one end is fixed with the first connecting steel plate, and the end face of the polyurethane elastomer at the other end and a friction plate-shaped body embedded in the second connecting steel plate form a sliding friction pair;
the drum-shaped damping elastic body is in a column shape with a side wall bulging outwards to form an arc surface, and the upper end and the lower end of the drum-shaped damping elastic body are fixedly connected between the first connecting steel plate and the second connecting steel plate.
2. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
the drum-shaped damping elastomer comprises an upper sealing plate, a lower sealing plate, a plurality of layers of stiffening steel plates and a damping elastic material;
damping elastic materials are filled in the gaps and the peripheries between the sealing plates and the stiffening steel plates; the closing plate is fixedly connected with the first connecting steel plate and the second connecting steel plate.
3. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
the friction plate body is a polytetrafluoroethylene plate.
4. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
the surface of the friction plate-shaped body is higher than the inner surface of the second connecting steel plate.
5. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
the friction plate-shaped body is circular.
6. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
the outer diameter of the friction plate-shaped body is larger than that of the vertical core device.
7. The split seismic isolation apparatus of claim 6, wherein:
the edge of the friction plate-shaped body is pressed between the drum damping elastic body and the second connecting steel plate.
8. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
the radius of an arc line bulged by the drum-shaped damping elastomer in the vertical section is 100 mm and 200 mm.
9. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
in the drum-shaped damping elastomer, the width of the stiffening steel plate is larger than that of the sealing plate.
10. A split-type seismic isolation apparatus as claimed in claim 1, wherein:
the outer connecting steel plate, the vertical core device and the drum-shaped damping elastomer are connected in a combined assembly mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120417826.3U CN214531260U (en) | 2021-02-25 | 2021-02-25 | Disconnect-type shock isolation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120417826.3U CN214531260U (en) | 2021-02-25 | 2021-02-25 | Disconnect-type shock isolation device |
Publications (1)
| Publication Number | Publication Date |
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| CN214531260U true CN214531260U (en) | 2021-10-29 |
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| CN202120417826.3U Active CN214531260U (en) | 2021-02-25 | 2021-02-25 | Disconnect-type shock isolation device |
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| CN (1) | CN214531260U (en) |
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2021
- 2021-02-25 CN CN202120417826.3U patent/CN214531260U/en active Active
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: LIUZHOU ORIENT ENGINEERING RUBBER PRODUCTS Co.,Ltd. Assignor: DUNHUDA (WUHAN) TECHNOLOGY Co.,Ltd. Contract record no.: X2023980046315 Denomination of utility model: A separate isolation device Granted publication date: 20211029 License type: Common License Record date: 20231109 |
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| EE01 | Entry into force of recordation of patent licensing contract |