CN215761760U - Multi-air-chamber honeycomb type closed air bag - Google Patents
Multi-air-chamber honeycomb type closed air bag Download PDFInfo
- Publication number
- CN215761760U CN215761760U CN202121226572.3U CN202121226572U CN215761760U CN 215761760 U CN215761760 U CN 215761760U CN 202121226572 U CN202121226572 U CN 202121226572U CN 215761760 U CN215761760 U CN 215761760U
- Authority
- CN
- China
- Prior art keywords
- air
- regular hexagon
- inflation
- bag
- internal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The utility model discloses a multi-air-chamber honeycomb type closed air bag which comprises an outer bag body, wherein a plurality of regular hexagon internal bag bodies are stacked and filled in the outer bag body, and a semi-regular hexagon internal bag body is filled in a gap between two adjacent regular hexagon internal bag bodies in a row of regular hexagon internal bag bodies at the topmost layer and a row of regular hexagon internal bag bodies at the bottommost layer; after the outer bag body is filled with air in a roadway, one surface is an explosion facing surface, the other surface is a safety surface, an inflation valve is arranged at the explosion facing surface, and an exhaust valve is arranged at the safety surface; and a one-way valve is arranged between the inner bag bodies of the adjacent regular hexagon bodies, and the conduction direction of the one-way valve is from the explosion-facing surface to the safety surface. The utility model adopts the multi-air-chamber honeycomb type closed air bag, and through the honeycomb type internal design, not only the air chambers are increased, and the anti-explosion buffering performance and the fault-tolerant rate are improved, but also the volume of the air bag is greatly reduced through the integral honeycomb type design, so that the risk of slippage and damage of the air bag is reduced.
Description
Technical Field
The utility model relates to the field of mine fire disaster relief, in particular to an anti-explosion closed air bag, and more particularly to a multi-air-chamber honeycomb closed air bag.
Background
The underground fire of the coal mine not only burns equipment and resources to cause casualties of workers in operation places, but also induces gas explosion, so that the effectiveness of disaster relief measures and the rapidity of disaster relief actions are the key points for the success of fire relief. The coal mine tunnel rapid sealing technology is an effective means for fire development and suffocation fire extinguishing, and is widely applied to coal mine fire disaster relief practices. The air bag sealing technology overcomes the defects of time and labor waste and the like of the traditional sealing structure and the filling sealing, and is gradually put into practical application. Research shows that most of the existing air bags are sealed into a single structure, and the design on the anti-explosion buffering performance of the air bags is rarely carried out. However, the air current is reduced during the sealing construction, the gas in the sealed area is continuously discharged, the gas concentration is rapidly increased, and the fire source exists in the fire area, so that the danger of gas explosion is greatly increased, and the life safety of sealing construction personnel is seriously threatened. Therefore, the anti-explosion buffering performance of the air bag is further improved, and the air bag is the key of the wide application of the air bag sealing in the coal mine fire disaster relief.
The patent number CN202010002439.3 is a Chinese invention patent which discloses an anti-knock multi-bag quick-sealing air bag and a use method thereof, the patent innovatively provides a design method for adding air bag monomers along the trend of a roadway, and under the conditions of experiment and simulation, through effective verification, the design effectively improves the anti-knock buffer performance by adding bag chambers of the air bag. However, in application, although the single body is easy to transport and assemble, the final integral structure of the air bag is large, the contact area with a roadway is large, and the risk of slippage and breakage is increased. Therefore, the size of the whole structure is effectively reduced, the inflation pressure can be achieved more quickly, and the risk of slippage and damage of the air bag can be reduced.
In addition, the honeycomb structure of the bees is delicate and material-saving. The honeycomb is composed of numerous regular hexagonal cells of the same size, each surrounded by other cells. It is remarkable that all bees in the world have their cells constructed according to this model. The honeycomb structure is high in strength, light in weight, and also beneficial to sound insulation and heat insulation. The honeycomb structure has excellent performances in the aspects of strength, fatigue strength, sound and heat insulation, earthquake resistance, weight reduction and the like. The existing space shuttle, artificial satellite and spacecraft are largely in a honeycomb structure, and the outer shell of the satellite is almost in a honeycomb structure. These spacecraft are therefore also collectively referred to as "cellular spacecraft". And these "honeycomb-type spacecrafts" are very material-saving. The method is widely applied to various aspects of buildings, airplanes, automobiles, ships and the like.
SUMMERY OF THE UTILITY MODEL
Based on the technical problem, the utility model provides a multi-air-chamber honeycomb type closed air bag.
The technical solution adopted by the utility model is as follows:
a multi-air-chamber honeycomb type closed air bag comprises an outer bag body, wherein a plurality of regular hexagonal inner bag bodies are stacked and filled in the outer bag body, and the arrangement direction of the regular hexagonal inner bag bodies after being inflated is vertical to the extending direction of a roadway;
semi-regular hexagon internal pockets are filled in gaps between two adjacent regular hexagon internal pockets in the top row of regular hexagon internal pockets and the bottom row of regular hexagon internal pockets;
after the outer bag body is filled with air in a roadway, one surface is an explosion facing surface, the other surface is a safety surface, an inflation valve is arranged at the explosion facing surface, and an exhaust valve is arranged at the safety surface;
and a one-way valve is arranged between the adjacent regular hexagon internal capsules or between the regular hexagon internal capsule and the adjacent semi-regular hexagon internal capsule, and the conduction direction of the one-way valve is from the explosion-facing surface to the safety surface.
Preferably, the number of the inflation valves is two, namely a first inflation valve and a second inflation valve, the first inflation valve is arranged at the bottom of one regular hexagonal internal bladder body which is arranged in the row of regular hexagonal internal bladder bodies at the bottommost layer and is closest to the explosion facing surface of the outer bladder body; the second inflation valve is arranged at the middle lower part of the explosion-facing surface of the outer bag body.
Preferably, the two rows of regular hexagon inner bag bodies and the one row of semi-regular hexagon inner bag bodies which are positioned at the bottom of the outer bag body are communicated with the first inflation valve through one-way valves, and the bottom is formed after the inflation through the first inflation valve; the other rows of regular hexagon internal bladder bodies and the row of semi-regular hexagon internal bladder bodies in the outer bladder body are communicated with the second inflation valve through one-way valves.
Preferably, the bottom surface of the closed air bag is horizontal after the closed air bag is inflated.
Preferably, the top of the outer bag body is also provided with an arch-shaped protrusion part, two ends of the arch-shaped protrusion part are also respectively communicated with two regular hexagon internal bag bodies at two ends of a row of regular hexagon internal bag bodies at the topmost layer through one-way valves, wherein one regular hexagon internal bag body close to the explosion facing surface of the outer bag body supplies air to the arch-shaped protrusion part, and the arch-shaped protrusion part exhausts air to the other regular hexagon internal bag body far away from the explosion facing surface of the outer bag body.
Preferably, the outer capsule body is made of a P4U smart material, or the outer capsule body is made of a coating cloth, and a P4U smart material layer is arranged on the explosion facing surface of the outer capsule body; the regular hexagon internal capsule body and the semi-regular hexagon internal capsule body are both made of coating cloth.
Preferably, the adjacent regular hexagon internal capsule body, the adjacent semi-regular hexagon internal capsule body, the semi-regular hexagon internal capsule body and the external capsule body are processed into an integral structure by sewing.
Preferably, the first inflation valve is connected with the first inflation pipeline, the second inflation valve is connected with the second inflation pipeline, the air inlet ends of the first inflation pipeline and the second inflation pipeline are connected with an air source, and the air source is also provided with a self-operated pressure control valve.
Preferably, the closed air bag further comprises a gas collecting pipeline, and the first inflation pipeline, the second inflation pipeline and the gas collecting pipeline are distributed along one side of the roadway air pipe or the roadway water pipe and are fixed.
Preferably, the longitudinal section of the closed air sac is oval.
The beneficial technical effects of the utility model are as follows:
1. the utility model adopts the multi-air-chamber honeycomb type closed air bag, not only increases the air chambers and improves the anti-explosion buffer performance and the fault-tolerant rate through the honeycomb type internal design, but also greatly reduces the volume of the air bag (the length of the air bag along the trend of a roadway can be reduced by half) through the integral honeycomb type design, so that the risk of slippage and damage of the air bag is reduced.
2. According to the utility model, two inflation valves and two inflation pipelines are arranged, so that personnel can withdraw after the bottom of the air bag is inflated and formed through the first inflation pipeline, and the upper part of the air bag is continuously inflated through the second inflation pipeline, thereby improving the safety coefficient of the personnel.
3. The utility model is also provided with a self-operated pressure control valve, when the inflation reaches a certain pressure, the self-operated pressure control valve can be connected, and due to the existence of the self-operated pressure control valve, the air bag can be always kept in a pressure stabilizing state, the influence of air leakage is not needed to be worried about, and even if part of the air bag is damaged by friction, the air bag can be kept in a certain strength and form due to continuous inflation.
4. The reinforced coating cloth adopted by the material of the air bag is low in price, the P4U intelligent material is a little higher in price, but the overall cost is far lower than that of an inorganic material filling technology, and the material of the air bag does not generate toxic gas; P4U smart material (which is normally in a relaxed state, soft and elastic, and when subjected to a severe impact or compression, the molecules are immediately locked with each other, rapidly tightened and hardened to absorb external force to form a protective layer, and when the external force disappears, the material returns to its original relaxed soft and elastic state). The P4U intelligent material is used as a multi-air-chamber honeycomb type outer-layer film, so that the strength and the buffering performance of the air bag are improved.
5. The air bag is closed, the problems of time and labor waste of the traditional manual construction of the closed wall are solved, the operation is simple and convenient, and the manufacturing cost is low.
Drawings
The utility model will be further described with reference to the following detailed description and drawings:
FIG. 1 is a schematic overall structure diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of a longitudinal cross-sectional structure along a roadway extending direction after the arrangement of FIG. 1;
FIG. 3 is a schematic diagram of a longitudinal cross-sectional structure of another embodiment of the present invention, showing a structure in which an arch-shaped protrusion is additionally provided at the top;
fig. 4 is a schematic view of the structure of a single hexagonal intrabody bladder of the present invention.
Detailed Description
Combine the attached drawing, a many air chambers honeycomb airtight gasbag, including outer utricule 1, pile up and fill the internal utricule 2 of a plurality of regular hexagon in the inside of outer utricule 1, the internal utricule 2 of regular hexagon is aerifyd the back and is arranged the direction and is mutually perpendicular with the extension direction in tunnel, that is to say regular hexagon internal utricule 2 transverse arrangement in the tunnel. Fill in the space between the internal utricule of adjacent two regular hexagon in the internal utricule in one row of regular hexagon at the top layer and the internal utricule of one row of regular hexagon at the bottom layer and have half the internal utricule 3 of regular hexagon, can realize the seamless packing of 1 top and bottom of outer utricule through half the internal utricule 3 of regular hexagon. After the outer bag body 1 is filled with air in a roadway, one surface is an explosion-facing surface 101, the other surface is a safety surface 102, an air charging valve is arranged at the explosion-facing surface 101, and an air discharging valve 4 is arranged at the safety surface. And a one-way valve 5 is arranged between the adjacent regular hexagon internal capsules or between the regular hexagon internal capsule and the adjacent semi-regular hexagon internal capsule, and the conduction direction of the one-way valve 5 is from the explosion-facing surface to the safety surface.
The utility model adopts the multi-air-chamber honeycomb type closed air bag, not only increases the air chambers and improves the anti-explosion buffer performance and the fault-tolerant rate through the honeycomb type internal design, but also greatly reduces the volume of the air bag (the length of the air bag along the trend of a roadway can be reduced by half) through the integral honeycomb type design, so that the risk of slippage and damage of the air bag is reduced.
As a further design of the utility model, two inflation valves are arranged, namely a first inflation valve 6 and a second inflation valve 7, and the first inflation valve 6 is arranged at the bottom of one regular hexagonal internal bladder body which is arranged in the row of regular hexagonal internal bladder bodies at the bottommost layer and is closest to the explosion facing surface of the outer bladder body. The second inflation valve 7 is arranged at the middle lower part of the explosion-facing surface of the outer bag body. The two rows of regular hexagon internal pockets and the one row of semi-regular hexagon internal pockets which are positioned at the bottom of the external pocket are communicated with a first inflation valve 6 through a one-way valve, and the bottoms of the pockets are formed after the pockets are inflated through the first inflation valve. The other rows of regular hexagon internal bladder bodies and the row of semi-regular hexagon internal bladder bodies in the outer bladder body are communicated with a second inflation valve 7 through one-way valves. After the bottom of the air bag is inflated and formed through the first inflation valve 6, personnel can withdraw, and at the moment, the upper part of the air bag is continuously inflated through the second inflation valve 7, so that the safety factor of the personnel is improved.
Furthermore, the bottom surface of the closed air bag is horizontal after the closed air bag is inflated. The top of the outer bag body is also provided with an arch-shaped protrusion part 8, the two ends of the arch-shaped protrusion part are also respectively communicated with two regular hexagon internal bag bodies at the two ends of the top row of regular hexagon internal bag bodies through one-way valves, wherein one regular hexagon internal bag body close to the explosion facing surface of the outer bag body supplies air to the arch-shaped protrusion part, and the arch-shaped protrusion part exhausts air to the other regular hexagon internal bag body far away from the explosion facing surface of the outer bag body. Through the setting of arch jut 8, can laminate with tunnel arch top surface better.
Further, the outer capsule body 1 is made of a P4U smart material, or is made of a coating cloth, and a P4U smart material layer is arranged on the explosion facing surface of the outer capsule body; the regular hexagon internal capsule body 2 and the semi-regular hexagon internal capsule body 3 are both made of coating cloth. The adjacent regular hexagon internal capsule body, the adjacent semi-regular hexagon internal capsule body, the semi-regular hexagon internal capsule body and the external capsule body are processed into an integral structure by sewing. The reinforced coating cloth adopted by the material of the air bag is low in price, the P4U intelligent material is a little higher in price, but the overall cost is far lower than that of an inorganic material filling technology, and the material of the air bag does not generate toxic gas; P4U smart material (which is normally in a relaxed state, soft and elastic, and when subjected to a severe impact or compression, the molecules are immediately locked with each other, rapidly tightened and hardened to absorb external force to form a protective layer, and when the external force disappears, the material returns to its original relaxed soft and elastic state). The P4U intelligent material is used as a multi-air-chamber honeycomb type outer-layer film, so that the strength and the buffering performance of the air bag are improved.
Furthermore, the first inflation valve is connected with the first inflation pipeline, the second inflation valve is connected with the second inflation pipeline, the air inlet ends of the first inflation pipeline and the second inflation pipeline are connected with an air source, and a self-operated pressure control valve is further configured at the air source. When the inflation reaches a certain pressure, the self-operated pressure control valve can be connected, and due to the existence of the self-operated pressure control valve, the air bag can be always kept in a pressure stabilizing state, the influence of air leakage is not needed, and even if the air bag has partial friction damage, the air bag can be kept in a certain strength and form due to continuous inflation.
Furthermore, the closed air bag also comprises a gas collecting pipeline, and the first inflation pipeline, the second inflation pipeline and the gas collecting pipeline are distributed along one side of the roadway air pipe or the roadway water pipe and are fixed. Of course, the cut may also be made from the ground down to the safety surface. The air inlet of the gas collection pipeline is positioned on the explosion-facing surface, and parameters such as air temperature, gas concentration, oxygen concentration and the like in the closed part can be monitored in real time during the closing process through the gas collection pipeline.
The longitudinal section of the closed air bag is elliptical, and the whole closed air bag is of a honeycomb structure.
The use method of the multi-air-chamber honeycomb closed air bag comprises the following steps:
step one, arrangement work: the multi-air-chamber honeycomb type airbag is characterized in that the multi-air-chamber honeycomb type airbag, a first air inlet pipeline, a second air inlet pipeline, a self-operated pressure control valve and a gas collecting pipeline are conveyed to a closed position, sundries in a closed place are properly cleaned, the first air inlet pipeline, the second air inlet pipeline and the gas collecting pipeline are distributed along one side of a roadway air pipe and one side of a roadway water pipe, the multi-air-chamber honeycomb type airbag is spread and tiled, and the multi-air-chamber honeycomb type airbag is connected with two inflation pipelines.
Step two, an inflation operation process: the first air inlet pipeline is connected with an air source, and the air source can be a compressed air pipeline, a nitrogen cylinder, an air compressor, an artificial cutworm and the like. After the first air inlet pipeline fills the air bag to working pressure, the bottom of the air bag is formed, two air filling pipelines are combined into one by two, an air source is connected, and people can leave. The self-operated pressure control valve can stabilize the pressure in the air bag within the working pressure range. After the inflation is finished, the air bag can be tightly attached to the wall of the tunnel by means of the good elasticity of the reinforced coating cloth. When the inflation pressure is reached, the self-operated pressure control valve cuts off the air source, so that the air bag can be always kept in a stable pressure state, the influence of air leakage is not needed to be worried, and even if the air bag has partial friction damage, the air bag can be kept in a certain strength and form due to continuous inflation.
Step three, gas sample collection: during the airtight period, in order to facilitate the real-time monitoring of parameters such as air temperature, gas concentration, oxygen concentration and the like in the airtight interior, gas sample collection can be carried out through the gas collection pipeline. The gas collecting pipeline is opened for extraction, and the integral structure of the air bag is not influenced.
Step four, recovery work: after the sealing is finished, the fire sealing area is opened, the air source is firstly closed, then the exhaust valve or the air release valve of the safety side air bag is opened, and the air in the air bag flows out to the safety surface along the one-way valve due to the reduction of the air pressure of the safety surface. And finishing the exhaust work, and folding and recovering the multi-air-chamber honeycomb type air bag and the auxiliary devices thereof.
Parts not described in the above modes can be realized by adopting or referring to the prior art.
It is intended that any equivalents, or obvious variations, which may be made by those skilled in the art in light of the teachings herein, be considered within the scope of the present invention.
Claims (10)
1. A many air chambers honeycomb airtight gasbag which characterized in that: the inflatable roadway comprises an outer bag body, wherein a plurality of regular hexagon internal bag bodies are stacked and filled in the outer bag body, and the arrangement direction of the regular hexagon internal bag bodies after being inflated is vertical to the extending direction of a roadway;
semi-regular hexagon internal pockets are filled in gaps between two adjacent regular hexagon internal pockets in the top row of regular hexagon internal pockets and the bottom row of regular hexagon internal pockets;
after the outer bag body is filled with air in a roadway, one surface is an explosion facing surface, the other surface is a safety surface, an inflation valve is arranged at the explosion facing surface, and an exhaust valve is arranged at the safety surface;
and a one-way valve is arranged between the adjacent regular hexagon internal capsules or between the regular hexagon internal capsule and the adjacent semi-regular hexagon internal capsule, and the conduction direction of the one-way valve is from the explosion-facing surface to the safety surface.
2. The multi-cell honeycomb air-tight bladder of claim 1, wherein: the two inflation valves are respectively a first inflation valve and a second inflation valve, and the first inflation valve is arranged at the bottom of one regular hexagonal internal bag body which is arranged in the row of regular hexagonal internal bag bodies at the bottommost layer and is closest to the explosion facing surface of the external bag body; the second inflation valve is arranged at the middle lower part of the explosion-facing surface of the outer bag body.
3. The multi-cell honeycomb air-tight bladder of claim 2, wherein: two rows of regular hexagon inner bag bodies and one row of semi-regular hexagon inner bag bodies which are positioned at the bottom of the outer bag body are communicated with a first inflation valve through a one-way valve, and the bottom of the outer bag body is formed after the outer bag body is inflated through the first inflation valve; the other rows of regular hexagon internal bladder bodies and the row of semi-regular hexagon internal bladder bodies in the outer bladder body are communicated with the second inflation valve through one-way valves.
4. The multi-cell honeycomb air-tight bladder of claim 1, wherein: the bottom surface of the closed air bag is horizontal after the air bag is inflated.
5. The multi-cell honeycomb air-tight bladder of claim 1, wherein: the top of the outer bag body is also provided with an arch-shaped protrusion part, two ends of the arch-shaped protrusion part are also communicated with two regular hexagon inner bag bodies at two ends of a row of regular hexagon inner bag bodies at the top layer through one-way valves respectively, wherein one regular hexagon inner bag body close to the explosion facing surface of the outer bag body supplies air to the arch-shaped protrusion part, and the arch-shaped protrusion part exhausts air to the other regular hexagon inner bag body far away from the explosion facing surface of the outer bag body.
6. The multi-cell honeycomb air-tight bladder of claim 1, wherein: the outer capsule body is processed by P4U intelligent material, or the outer capsule body is processed by coating cloth, and a P4U intelligent material layer is arranged on the explosion-facing surface of the outer capsule body; the regular hexagon internal capsule body and the semi-regular hexagon internal capsule body are both made of coating cloth.
7. The multi-cell honeycomb air-tight bladder of claim 1, wherein: the adjacent regular hexagon internal capsule body, the adjacent semi-regular hexagon internal capsule body, the semi-regular hexagon internal capsule body and the external capsule body are processed into an integral structure by sewing.
8. The multi-cell honeycomb air-tight bladder of claim 2, wherein: the first inflation valve is connected with the first inflation pipeline, the second inflation valve is connected with the second inflation pipeline, the air inlet ends of the first inflation pipeline and the second inflation pipeline are connected with an air source, and the air source is also provided with a self-operated pressure control valve.
9. The multi-cell honeycomb air-tight bladder of claim 8, wherein: the closed air bag also comprises a gas collecting pipeline, and the first inflation pipeline, the second inflation pipeline and the gas collecting pipeline are distributed along one side of the roadway air pipe or the water pipe and are fixed.
10. The multi-cell honeycomb air-tight bladder of claim 1, wherein: the longitudinal section of the closed air bag is elliptical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121226572.3U CN215761760U (en) | 2021-06-02 | 2021-06-02 | Multi-air-chamber honeycomb type closed air bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121226572.3U CN215761760U (en) | 2021-06-02 | 2021-06-02 | Multi-air-chamber honeycomb type closed air bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215761760U true CN215761760U (en) | 2022-02-08 |
Family
ID=80099065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121226572.3U Active CN215761760U (en) | 2021-06-02 | 2021-06-02 | Multi-air-chamber honeycomb type closed air bag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215761760U (en) |
-
2021
- 2021-06-02 CN CN202121226572.3U patent/CN215761760U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7213494B2 (en) | Blast protection structures | |
| US5719350A (en) | Blast and splinter proof screening device and his method of use | |
| WO2005090897A1 (en) | Improvements in and relating to blast mitigation structures | |
| CN201934141U (en) | Mining assembly-type laneway plugging airbag | |
| CN215761760U (en) | Multi-air-chamber honeycomb type closed air bag | |
| CN108327907A (en) | A kind of working method of the airborne multi-stage gasbag collaboration buffer unit of equipment | |
| CN104401499A (en) | Landing buffering device for unmanned aerial vehicle recovery by parachute | |
| CN111997494A (en) | Civil air defense door based on high-barrier effect | |
| US11555326B2 (en) | Inflatable impact shield system | |
| CN202078659U (en) | Emergency escape chute of high-rise buildings | |
| CN104775850A (en) | Downhole rapid expansion sealing wall | |
| CN204552823U (en) | A kind of mine air filling type expansion brattice | |
| GB2255502A (en) | An inflatable bulkhead arrangement | |
| CN207728392U (en) | A kind of mining inflatable airbag and plugging device | |
| CN110671978B (en) | Device for transferring explosive substances | |
| CN210292468U (en) | Organ transfer bag adaptable to high-altitude transportation environment | |
| CN102785779B (en) | A kind of initiatively expansion equation parachute | |
| CN112386817A (en) | High-altitude escape ball | |
| CN212250147U (en) | Mining quick airtight capsule device | |
| CN110193149A (en) | A kind of inflation escape device and its escape method for skyscraper | |
| CN217462259U (en) | Water-bursting sand-bursting blocking escape-assisting device | |
| CN211228619U (en) | PE tectorial membrane waterproofing membrane | |
| JP3175134U (en) | Atmospheric pressure expansion shock absorber | |
| CN211672640U (en) | Emergency rescue helmet | |
| CN113279815B (en) | Anti-explosion multi-bag type air bag and truss structure combined sealing device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |