CN115928886B - Wedge-shaped sliding pressure release type horizontal locking shock insulation device and method - Google Patents
Wedge-shaped sliding pressure release type horizontal locking shock insulation device and method Download PDFInfo
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- CN115928886B CN115928886B CN202211475256.9A CN202211475256A CN115928886B CN 115928886 B CN115928886 B CN 115928886B CN 202211475256 A CN202211475256 A CN 202211475256A CN 115928886 B CN115928886 B CN 115928886B
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- 230000035939 shock Effects 0.000 title claims abstract description 78
- 238000009413 insulation Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002955 isolation Methods 0.000 claims abstract description 34
- 239000004567 concrete Substances 0.000 claims abstract description 10
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 8
- 230000013011 mating Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 abstract description 12
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 230000006378 damage Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of shock insulation, in particular to a wedge-shaped sliding pressure relief type horizontal locking shock insulation device and a method, wherein the device comprises a shock insulation support arranged between a concrete support and a structural bottom plate; the locking structure comprises four first wedge-shaped plates which are vertically arranged, the rectangles are arranged around the shock insulation support, the top end of each first wedge-shaped plate is provided with a first wedge-shaped surface with the inner height and the outer height, and the bottom end of each first wedge-shaped plate is hinged with the concrete support; each first wedge-shaped plate is independently provided with a piston structure, a piston cavity of the first wedge-shaped plate is embedded in a structural bottom plate, the end part of the piston is provided with a second wedge-shaped surface matched with the first wedge-shaped surface, hydraulic oil is filled in the piston cavity, and a valve with a set threshold value is arranged in the piston cavity; according to the utility model, through the cooperation of the first wedge plate and the wedge surface of the piston structure, the vibration isolation support can be initially locked in the horizontal direction, and when the vibration isolation support does not exceed the vibration-proof reference acceleration, the vibration isolation support only plays a role of a common support, and the pipeline is not broken due to large basic displacement.
Description
Technical Field
The utility model relates to the technical field of shock insulation, in particular to a wedge-shaped sliding pressure release type horizontal locking shock insulation device and method.
Background
The earthquake-resistant theory and the earthquake-resistant measure of the current building structure are continuously developed, and building engineering personnel study and reform the building structure so that the building structure can resist earthquake disasters, reduce casualties and economic losses and undergo the following evolution: rigid structural systems, flexible underlying structural systems, ductile structural systems, and seismic isolation structural systems.
The use of shock-insulating devices has led to the development of structural shock-resistant designs from "anti" to "anti", representing the latest direction of development of structural shock-resistant technologies. The most common technique for shock resistance and energy dissipation is to provide a shock insulation device mainly composed of a shock insulation support (also called a shock insulation cushion) and a damper.
However, the provision of only the shock-insulating device has obvious drawbacks, mainly that the basic displacement thereof may cause the pipeline to break, no matter what earthquake occurs, which brings about a lot of disadvantages for operation, maintenance and the like. Especially for nuclear power plants, once the critical pipeline breaks, nuclear safety accidents may even be induced.
The patent of the utility model in China with the application number of 200920167910.3 discloses a nuclear power plant nuclear island structure foundation vibration isolation device with a locking function, and the horizontal initial locking device with the vibration isolation pad is provided while the vibration isolation pad is arranged, so that the vibration isolation support only plays a vibration isolation effect under an over-design reference earthquake event, the whole nuclear island structure can be in a structure safety state during the over-design reference earthquake, and the risk caused by large foundation displacement can be furthest reduced. The utility model adopts a shearing type structural arrangement, and under the condition of exceeding a design reference seismic event, the screw rod of the device can be sheared, so that the locking of the shock insulation pad in the initial horizontal direction is released. However, since the setting of the locking is mainly determined by the shearing resistance of the screw, and is influenced by uneven materials and the like, the shearing resistance of the screw may fluctuate, thereby influencing the accuracy of the locking device; and the screw is too close to the shock insulation pad, broken screws or other components thrown out during shearing can damage the shock insulation pad, and the working effect of the shock insulation pad is affected.
Disclosure of Invention
The utility model aims to provide a wedge-shaped sliding pressure release type horizontal locking shock insulation device and a method, which are used for solving the problems that in the prior art, screw locking precision is low and a shock insulation support is damaged by shearing a projectile. In order to achieve the above object, the present utility model solves the following problems by the following technical scheme:
in a first aspect, the present utility model provides a wedge sliding pressure relief horizontal locking shock insulation device, comprising:
the shock insulation support is arranged between the concrete support and the structural bottom plate;
the locking structure comprises four first wedge-shaped plates which are vertically arranged, the rectangles are arranged around the shock insulation support, the top end of each first wedge-shaped plate is provided with a first wedge-shaped surface with the inner height and the outer height, and the bottom end of each first wedge-shaped plate is hinged with the concrete support; each first wedge-shaped plate is independently provided with a piston structure, a piston cavity of the first wedge-shaped plate is embedded in the structure bottom plate, the end part of the piston of the first wedge-shaped plate is provided with a second wedge-shaped surface matched with the first wedge-shaped surface, and hydraulic oil is filled in the piston cavity and a valve with a set threshold value is arranged in the piston cavity.
As a further technical scheme, the piston comprises a piston body and a second wedge-shaped plate fixed on the piston body, wherein the second wedge-shaped surface is arranged at the end part of the second wedge-shaped plate.
As a further technical solution, the piston stretches in the vertical direction.
As a further technical solution, the first wedge-shaped surface and the second wedge-shaped surface can slide transversely and longitudinally along the mating surface.
As a further technical solution, the piston is pushed by the sliding of the first wedge-shaped surface and the second wedge-shaped surface along the transverse direction of the matching surface.
As a further technical scheme, the inner side of the first wedge-shaped plate is in free contact with the shock insulation support.
As a further technical solution, one end of the piston cavity extends upwards out of the structural bottom plate, and the valve is arranged at the end.
As a further technical scheme, the shock insulation support adopts a lead core laminated rubber shock insulation support with a square section.
In a second aspect, the present utility model provides a seismic isolation method of the wedge sliding pressure relief type horizontal directional locking seismic isolation apparatus according to the first aspect, comprising the steps of:
when impact is generated, the first wedge-shaped surface of the first wedge-shaped plate and the second wedge-shaped surface of the piston structure generate transverse sliding along the matching surface, the piston is pushed to generate pressure in the piston cavity, the valve is automatically opened or kept in a closed state according to a set threshold value, and if the valve is opened, the corresponding first wedge-shaped plate is automatically turned to the outside and falls down, so that initial locking in the direction is released.
As a further technical scheme, if the pressure generated in the piston cavity by the impact in a certain horizontal direction does not exceed the valve threshold value, the opposite shock insulation support formed by the first wedge-shaped plate and the piston structure is continuously and effectively locked in the horizontal direction, and the shock insulation support only plays a role of a common support;
if the pressure generated by the impact in a certain horizontal direction in the piston cavity exceeds the valve threshold, the valve is opened, the piston is retracted, the horizontal initial locking of the shock insulation support is failed, and the shock insulation support can horizontally move sideways in the horizontal direction, so that the shock insulation support has the effects of energy dissipation and shock absorption.
The beneficial effects of the utility model are as follows:
(1) According to the utility model, through the cooperation of the first wedge plate and the wedge surface of the piston structure, the vibration isolation support can be initially locked in the horizontal direction, and when the vibration isolation support does not exceed the vibration-proof reference acceleration, the vibration isolation support only plays a role of a common support, and the pipeline is not broken due to large basic displacement.
(2) The locking failure of the utility model is achieved by the valve on the piston structure automatically acting according to the set threshold value, the execution is carried out without external force or electronic instruments, and the like, and the utility model has the characteristics of non-activity, no breaking event occurs in the whole process, and the damage to the surrounding caused by the flying object is avoided. The locking in the horizontal direction is controlled by the pressure in the piston cavity, so that the precision is high and the control is easy. In addition, the first wedge plate plays a role in protecting the shock insulation support, and can prevent damage to the shock insulation support caused by external flying objects.
(3) According to the utility model, after the initial horizontal locking in one horizontal direction fails, if the seismic acceleration in the other horizontal direction does not exceed the reference seismic acceleration, the initial locking in the failure direction can still continue to work.
(4) The earthquake isolation device does not break or destroy the structure in the earthquake process, and only needs to reset the first wedge-shaped plate and the piston after the earthquake is ended, and the pressure release valve is adjusted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. It should also be understood that the drawings are for simplicity and clarity and have not necessarily been drawn to scale. The utility model will now be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
FIG. 1 is a schematic cross-sectional view of a wedge sliding pressure relief horizontal locking shock insulation support in accordance with an embodiment of the present utility model;
fig. 2 shows a partially enlarged schematic illustration of fig. 1.
In the figure: 1. a concrete support; 2. a structural bottom plate; 3. a shock insulation support; 4. a first wedge plate; 5. a piston; 6. a piston chamber; 7. hydraulic oil; 8. and a valve.
Detailed Description
The technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a wedge-shaped sliding pressure release type horizontal locking shock insulation device, which comprises a shock insulation support 3 and a locking structure cooperating with the shock insulation support.
The earthquake-proof support 3 is arranged between the concrete support 1 and the structural bottom plate 2, and the concrete support 1 is located on a foundation of a building and is of a reinforced concrete structure; the structural bottom plate 2 at the upper part is a bottom plate of an upper structure supported by a shock insulation support 3, and the shock insulation support 3 is a lead core laminated rubber shock insulation support with a square section.
The locking structure comprises four vertically arranged first wedge plates 4 which are made of common structural steel, the top ends of the first wedge plates 4 are provided with first wedge faces with high inner parts and low outer parts, and the fact that one side, close to the shock insulation support 3, of the first wedge plates 4 is the inner side, the other side, far away from the side, is the outer side, and the same applies to the first wedge plates.
Four first wedge plates 4 rectangle are arranged around shock insulation support 3, and first wedge plate 4 plays the effect of protection shock insulation support, can prevent that the external object of penetrating from causing the destruction to shock insulation support. In this embodiment, the four first wedge plates 4 are identical in size and are arranged in a square shape, the inner sides of the first wedge plates 4 are in free contact with the shock insulation support 3, and the shock insulation support supports the first wedge plates 4 from the inner sides.
Each first wedge-shaped plate 4 is independently provided with a piston structure, a piston cavity 6 of the first wedge-shaped plate is embedded in a structural bottom plate 2, the end part of a piston 5 of the first wedge-shaped plate is provided with a second wedge-shaped surface matched with the first wedge-shaped surface, hydraulic oil 7 is filled in the piston cavity 6, and a valve 8 with a set threshold value is arranged, wherein the valve 8 is a pressure release valve in the embodiment, and the pressure is released automatically when the set threshold value is reached. The pressure relief valve sets up operating pressure according to the size of predetermined horizontal force, and when the hydraulic pressure exceeds the pressure relief valve threshold value in the piston chamber, the hydraulic oil gushes out through the pressure relief valve, also can adopt the blast valve to replace according to specific use application condition.
The piston 5 comprises a piston body and a second wedge plate fixed on the piston body, and the second wedge surface is arranged at the end part of the second wedge plate. The piston body adopts a rubber plug, and the sealing performance between the piston body and the piston cavity 6 is required to be good; the second wedge plate is made of common structural steel.
Through the cooperation work of first wedge plate 4 and piston structure wedge face, can carry out initial horizontal to locking to shock insulation support 3, when not surpassing antidetonation benchmark acceleration, shock insulation support 3 only plays ordinary support's effect, can not lead to the fracture of pipeline because of big basic displacement.
The valve on the piston structure automatically acts according to the set threshold value to execute the locking failure, and the locking failure has the characteristics of non-activity without external force, electronic instrument and the like, and does not generate fracture event in the whole process, and does not generate the flying object to damage the surrounding. The locking in the horizontal direction is controlled by the pressure in the piston cavity 6, so that the locking device has high precision and is easy to control.
The piston 5 stretches in the vertical direction, and is consistent with the vertical direction of the first wedge plate 4. The first wedge surface and the second wedge surface can slide transversely and longitudinally along the mating surface when impacted.
The piston 5 is pushed against by the lateral sliding of the first wedge surface and the second wedge surface along the mating surface. When the pressure generated in the piston cavity 6 is greater than the threshold value of the pressure relief valve, the pressure relief valve is automatically opened, and as the bottom end of the first wedge-shaped plate 4 is hinged with the concrete support 1, after the piston retreats, the two first wedge-shaped plates 4 on opposite sides are both outwards overturned automatically, and the initial horizontal locking in the direction is invalid. If the earthquake acceleration in the other horizontal direction does not exceed the reference earthquake acceleration, the initial locking in the non-failure direction can still continue to work, and the first wedge-shaped surface and the second wedge-shaped surface can longitudinally slide along the matching surface.
When the initial horizontal locking in one horizontal direction fails, if the earthquake acceleration in the other horizontal direction does not exceed the reference earthquake-resistant acceleration, the initial locking in the non-failure direction can still continue to work.
The shock isolation device can not break or destroy the structure in the earthquake process, and only the first wedge-shaped plate and the piston are required to be reset after the earthquake is finished, and the pressure release valve is adjusted.
In this embodiment, there is no special requirement for the piston chamber 6 and the hydraulic oil 7.
One end of the piston chamber 6 protrudes upwards beyond the structural floor 2, and a valve 8 is provided at this end. The pressure relief valve is arranged on the structural bottom plate 2, so that other instruments and equipment can be conveniently connected for research, for example, the pressure change condition of the container can be measured, and the magnitude and the change of earthquake force can be known.
Example two
The embodiment provides a shock isolation method of the wedge sliding pressure relief type horizontal locking shock isolation device according to the first embodiment, comprising the following steps:
taking earthquake impact as an example, when the earthquake impact is generated, the first wedge-shaped surface of the first wedge-shaped plate 4 and the second wedge-shaped surface of the piston 5 structure transversely slide along the matching surface to push the piston 5 to generate pressure in the cavity of the piston 5, and according to a set threshold value, the valve 8 is automatically opened or kept in a closed state, and if the valve 8 is opened, the corresponding first wedge-shaped plate 4 is automatically turned to the outside and falls down, and the initial locking in the direction is released.
If the pressure generated by the impact of the earthquake force in a certain horizontal direction in the piston cavity 6 does not exceed the threshold value of the valve 8, the first wedge-shaped plate 4 and the piston 5 are structurally formed to be continuously effective to the vibration isolation support 3 in the horizontal direction and initially locked, and the vibration isolation support 3 only plays a role of a common support.
If the pressure generated by the impact of a seismic force in a certain horizontal direction in the piston cavity 6 exceeds the threshold value of the valve 8, the valve 8 is opened, the piston 5 is retracted, the horizontal initial locking of the shock insulation support 3 fails, and the shock insulation support 3 can horizontally move sideways in the horizontal direction, so that the shock absorption and absorption effects are achieved.
For example, in the direction shown in fig. 1, after the pressure release valve reaches a set threshold value, the piston is retracted, the first wedge plates on the left side and the right side are turned over and fall together under the impact and shake, so that the initial locking of the shock insulation support 3 in the left-right horizontal direction fails, and the shock insulation support 3 can laterally move in the left-right horizontal direction. If the pressure release valve in the front-rear direction does not reach the set threshold value, the shock insulation support 3 horizontally moves sideways along the matching surface of the first wedge plate and the piston in the front-rear direction. If the pressure release valve in the front-rear direction also reaches a set threshold value, the shock insulation device is in a complete initial locking failure state.
In some complex impact occasions, oblique impact can occur, the impact is automatically decomposed, and when the pressure generated in which direction of decomposition acceleration generated in the front-back direction and the left-right direction reaches the set threshold value of the valve, the initial locking failure can be realized. Both directions are reached, and both directions achieve an initial lock failure.
In general, the direction of the impact generated by an earthquake is complex, and the vibration isolation device is required to automatically decompose the acceleration.
However, there are some applications where the impact direction is relatively fixed, for example, in the case of a nuclear power plant defending against a malicious impact of a commercial aircraft, the nuclear power plant is affected by surrounding terrain conditions and structural arrangements of the plant area, and the main nuclear facility may be limited in a certain range of the impact bearing, so that the impact generated in a certain direction is mainly considered and the impact acceleration does not need to be decomposed. In addition, in nuclear power design, certain important structures, systems or equipment can be sensitive to earthquake action in a certain direction, and at the moment, the shock insulation device is arranged in the sensitive direction, so that the safety of the structures, the systems or the equipment can be effectively improved.
Although the present utility model has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present utility model by using the methods and technical matters disclosed above without departing from the spirit and scope of the present utility model, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present utility model are within the scope of the technical matters of the present utility model.
Claims (10)
1. The utility model provides a wedge slip pressure release formula horizontal to locking shock insulation device which characterized in that includes:
the shock insulation support is arranged between the concrete support and the structural bottom plate;
the locking structure comprises four first wedge-shaped plates which are vertically arranged, the rectangles are arranged around the shock insulation support, the top end of each first wedge-shaped plate is provided with a first wedge-shaped surface with the inner height and the outer height, and the bottom end of each first wedge-shaped plate is hinged with the concrete support; each first wedge-shaped plate is independently provided with a piston structure, a piston cavity of the first wedge-shaped plate is embedded in the structure bottom plate, the end part of the piston of the first wedge-shaped plate is provided with a second wedge-shaped surface matched with the first wedge-shaped surface, and hydraulic oil is filled in the piston cavity and a valve with a set threshold value is arranged in the piston cavity.
2. The wedge sliding pressure relief type horizontal locking shock isolation device according to claim 1, wherein the piston comprises a piston body and a second wedge plate fixed on the piston body, and the second wedge surface is arranged at the end of the second wedge plate.
3. A wedge sliding pressure relief type horizontal locking shock isolation device according to claim 1, wherein said piston is vertically telescopic.
4. A wedge sliding pressure relief type horizontal locking shock absorbing device according to claim 3, wherein said first wedge surface and said second wedge surface are slidable in a transverse and longitudinal direction along said mating surfaces.
5. The wedge sliding pressure relief type horizontal locking shock absorbing device according to claim 4, wherein said piston is pushed by the lateral sliding movement of said first wedge surface and said second wedge surface along the mating surface.
6. A wedge sliding pressure relief type horizontal locking shock isolation device according to claim 1, wherein the inner side of said first wedge plate is in free contact with said shock isolation support.
7. A wedge sliding pressure relief type horizontal locking shock isolation device according to claim 1 wherein said piston chamber has one end extending upwardly from said structural floor and said valve is disposed at said end.
8. The wedge sliding pressure relief type horizontal locking vibration isolation device according to claim 1, wherein the vibration isolation support is a square-section lead core laminated rubber vibration isolation support.
9. The shock isolation method of a wedge sliding pressure relief type horizontal locking shock isolation device according to any one of claims 1 to 8, comprising the steps of:
when impact is generated, the first wedge-shaped surface of the first wedge-shaped plate and the second wedge-shaped surface of the piston structure generate transverse sliding along the matching surface, the piston is pushed to generate pressure in the piston cavity, the valve is automatically opened or kept in a closed state according to a set threshold value, and if the valve is opened, the corresponding first wedge-shaped plate is automatically turned to the outside and falls down, so that initial locking in the direction is released.
10. The method for isolating a wedge sliding pressure release type horizontal locking shock isolation device according to claim 9, wherein:
if the pressure generated in the piston cavity by the impact in a certain horizontal direction does not exceed the valve threshold value, the vibration isolation support formed by the first wedge-shaped plate and the piston structure is continuously and effectively locked in the horizontal direction, and the vibration isolation support only plays a role of a common support;
if the pressure generated by the impact in a certain horizontal direction in the piston cavity exceeds the valve threshold, the valve is opened, the piston is retracted, the horizontal initial locking of the shock insulation support is failed, and the shock insulation support can horizontally move sideways in the horizontal direction, so that the shock insulation support has the effects of energy dissipation and shock absorption.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211475256.9A CN115928886B (en) | 2022-11-23 | 2022-11-23 | Wedge-shaped sliding pressure release type horizontal locking shock insulation device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211475256.9A CN115928886B (en) | 2022-11-23 | 2022-11-23 | Wedge-shaped sliding pressure release type horizontal locking shock insulation device and method |
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| CN115928886A CN115928886A (en) | 2023-04-07 |
| CN115928886B true CN115928886B (en) | 2024-01-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006233757A (en) * | 1997-01-06 | 2006-09-07 | Jiro Kitamura | Base-isolating system, sliding support or base-isolated structure |
| CN201546235U (en) * | 2009-08-03 | 2010-08-11 | 上海核工程研究设计院 | Nuclear power plant nuclear island structure base isolation device with locking function |
| CN202124866U (en) * | 2011-06-03 | 2012-01-25 | 上海核工程研究设计院 | Separation plate type horizontal locking shock-isolation support |
| CN205894344U (en) * | 2016-06-23 | 2017-01-18 | 中国核电工程有限公司 | Vibration isolating device |
| CN112252161A (en) * | 2020-10-27 | 2021-01-22 | 中铁桥研科技有限公司 | Bridge structure damping device |
| CN217325898U (en) * | 2021-05-13 | 2022-08-30 | 深圳中广核工程设计有限公司 | Shock isolation device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6567265B2 (en) * | 2014-10-24 | 2019-08-28 | 株式会社東芝 | Seismic isolation device and seismic isolation method |
-
2022
- 2022-11-23 CN CN202211475256.9A patent/CN115928886B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006233757A (en) * | 1997-01-06 | 2006-09-07 | Jiro Kitamura | Base-isolating system, sliding support or base-isolated structure |
| CN201546235U (en) * | 2009-08-03 | 2010-08-11 | 上海核工程研究设计院 | Nuclear power plant nuclear island structure base isolation device with locking function |
| CN202124866U (en) * | 2011-06-03 | 2012-01-25 | 上海核工程研究设计院 | Separation plate type horizontal locking shock-isolation support |
| CN205894344U (en) * | 2016-06-23 | 2017-01-18 | 中国核电工程有限公司 | Vibration isolating device |
| CN112252161A (en) * | 2020-10-27 | 2021-01-22 | 中铁桥研科技有限公司 | Bridge structure damping device |
| CN217325898U (en) * | 2021-05-13 | 2022-08-30 | 深圳中广核工程设计有限公司 | Shock isolation device |
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| CN115928886A (en) | 2023-04-07 |
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