CN216741261U - Reinforced super-large steel heat-insulation fireproof door - Google Patents
Reinforced super-large steel heat-insulation fireproof door Download PDFInfo
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- CN216741261U CN216741261U CN202123167367.7U CN202123167367U CN216741261U CN 216741261 U CN216741261 U CN 216741261U CN 202123167367 U CN202123167367 U CN 202123167367U CN 216741261 U CN216741261 U CN 216741261U
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Abstract
The utility model discloses a reinforced super-large steel heat-insulation fireproof door, which comprises a door frame and two door leaves, wherein a first framework is arranged around each door leaf, a second framework is arranged in the middle of the first framework, the second framework comprises a transverse framework and a longitudinal framework which are fixedly connected, the first framework and the second framework are fixedly connected into a net-shaped body, and a third framework is arranged in the door frame; the door leaf comprises a galvanized steel sheet, the inner side of the galvanized steel sheet is provided with a flame-retardant cloth cover perlite fireproof plate, one side of the two door leaves, which is contacted with each other when the two door leaves are closed, is provided with a door seam sealing element, and a fireproof expansion sealing element is arranged between the door frame and the door leaf; the flame-retardant cloth cover perlite fireproof plate is filled in a netted body formed by the first framework and the second framework, the first framework and the second framework are hollow, and the back fire surface of the second framework is filled with the fireproof plate. The utility model provides a strenghthened type super large steel is thermal-insulated prevents fire door, and it has excellent fire-retardant fire resistance and seal.
Description
Technical Field
The utility model belongs to the technical field of fire door is prevented in the building, concretely relates to strenghthened type super large steel prevents heat and prevents fire door.
Background
The fireproof door is a door which can meet the requirements of fire-resistant stability, integrity and heat insulation within a certain time, and is a fireproof partition with certain fire resistance arranged in a fireproof partition room, an evacuation staircase, a vertical shaft and the like.
At present, all generally adopt fire door in the inside of some buildings, prevent that fire door indicates the door that can satisfy fire-resistant stability, integrality and heat-proof quality requirement at a certain time, and prevent that fire door still has the effect that prevents the intensity of a fire and spread and the flue gas diffusion, prevent that fire door generally divide into wooden fire door, steel and wood prevent fire door, other prevent fire door etc. prevent that fire door has excellent resistance to compression, anti ability of rolling over, and have certain aesthetic property still have and prevent fire door ability.
However, the existing steel fireproof door is poor in structural design, and when a fire disaster occurs, the fireproof performance of the existing steel fireproof door is poor due to the fact that the strength of the fireproof door body and the strength of the fireproof door frame facing the fire disaster are poor; and some fireproof door bodies and the like are provided with reinforcing ribs, but still have the problem of poor fireproof performance and sealing performance.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model discloses a main aim at provides a strenghthened type super large steel prevents heat and prevents fire door to solve the fire door fire behavior of current steel and the not good enough technical problem of seal performance.
The utility model aims at realizing through the following technical scheme:
a reinforced ultra-large steel heat-insulation fireproof door comprises a door frame and two door leaves, wherein the two door leaves are symmetrically fixed on frames on two sides of the door frame through at least six fireproof hinges; the periphery of each door leaf is provided with a first framework, a second framework is further arranged in the middle of each first framework, each second framework comprises a transverse framework and a longitudinal framework which are fixedly connected, the first frameworks and the second frameworks are fixedly connected into a net-shaped body, and a third framework is arranged in the door frame; the door leaves comprise galvanized steel sheets, the inner sides of the galvanized steel sheets are provided with flame-retardant cloth surface perlite fireproof plates, one sides of the two door leaves, which are contacted with each other when the two door leaves are closed, are provided with door seam sealing elements, and fireproof expansion sealing elements are arranged between the door frames and the door leaves; the flame-retardant cloth cover perlite fireproof plate is filled in the reticular body formed by the first framework and the second framework, the first framework and the second framework are hollow, and the back fire surface of the second framework is filled with the fireproof plate.
Preferably, wherein the interval between horizontal skeleton and the horizontal skeleton is the same, and the interval between longitudinal skeleton and the longitudinal skeleton is the same, still includes the slant skeleton, the slant skeleton distributes along 45 slopes of door leaf, the slant skeleton is connected into the dictyosome with horizontal skeleton, longitudinal skeleton fixed connection.
Preferably, the fire-receiving surfaces of the upper side and the lower side of the door frame are provided with first fire-proof expansion sealing parts along the horizontal direction, the fire-receiving surfaces of the left side and the right side of the door frame are provided with second fire-proof expansion sealing parts along the vertical direction, the upper side and the lower side of the door leaf are provided with third fire-proof expansion sealing parts along the horizontal direction, the left side and the right side of the door leaf are provided with fourth fire-proof expansion sealing parts along the vertical direction, the first fire-proof expansion sealing parts and the third fire-proof expansion sealing parts are arranged in a staggered vertical mode, and the second fire-proof expansion sealing parts and the fourth fire-proof expansion sealing parts are arranged in a staggered vertical mode.
Preferably, the door seam sealing element comprises two seam covering plates arranged on the fire-receiving surface and the back fire surface of the door leaf, and a fifth fire-proof expansion sealing element is arranged between the seam covering plates and the contact surface of the door leaf; the door leaf further comprises a sixth fireproof expansion sealing piece arranged on one side, which is contacted with the two door leaves when the two door leaves are closed, in the vertical direction.
Preferably, the first fire-proof expansion sealing element, the second fire-proof expansion sealing element, the third fire-proof expansion sealing element, the fourth fire-proof expansion sealing element, the fifth fire-proof expansion sealing element and the sixth fire-proof expansion sealing element are all structured as follows: the high-temperature expansion silica gel strip comprises a high-temperature expansion silica gel strip, wherein a sealed cavity is formed inside the high-temperature expansion silica gel strip, and a fireproof expansion graphite layer is fixedly arranged inside the sealed cavity.
Preferably, a fireproof lock and a fireproof bolt are further arranged on the door leaf.
Preferably, the fireproof plate comprises a glass magnesium fireproof substrate, a fireproof expansion material is arranged in the glass magnesium fireproof substrate, and the surface of the glass magnesium fireproof substrate is coated with an ammonium polyphosphate flame-retardant layer.
Preferably, the fire-retardant plate is a straw flame-retardant plate.
Compared with the prior art, the utility model discloses at least, following advantage has:
the reinforced oversized steel heat-insulation fireproof door provided by the utility model has the advantages that two door leaves are symmetrically fixed on the frames at two sides of the door frame through at least six fireproof hinges, so that the firm connection between the door leaves and the door frame is ensured; the first frameworks are arranged around each door leaf, the second frameworks are further arranged in the middles of the first frameworks and comprise transverse frameworks and longitudinal frameworks which are fixedly connected, the first frameworks and the second frameworks are fixedly connected to form a net-shaped body, and the third frameworks are arranged in the door frame; the fireproof door is characterized in that a flame-retardant cloth cover perlite fireproof plate is arranged on the inner side of a door leaf formed by galvanized steel sheets, a door seam sealing element is arranged on one side of the two door leaves which is contacted with each other when the two door leaves are closed, and a fireproof expansion sealing element is arranged between a door frame and the door leaf; the flame-retardant cloth cover perlite fireproof plate is filled in a reticular body consisting of the first framework and the second framework, and the fireproof plate is filled in the hollow parts of the first framework and the second framework and the back fire surface of the second framework; in the process of the fire, the framework ensures the compressive strength of the door leaf, and the fireproof plate, the flame-retardant cloth face perlite fireproof plate, the door seam sealing element and the fireproof expansion sealing element are arranged, so that the heat-insulation fireproof door has excellent flame retardance and impermeability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the oversized steel heat-insulation fireproof door provided by the utility model;
FIG. 2 is a schematic cross-sectional view taken along the line A-A in FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 5 is an enlarged view of a portion of FIG. 4;
fig. 6 is a schematic cross-sectional view of a fire-proof plate in the ultra-large steel heat-insulation fireproof door provided by the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The description in this application as relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Example 1
As shown in fig. 1-5, a reinforced ultra-large steel heat-insulating fireproof door comprises a door frame 1 and two door leaves 2, wherein the door leaves 2 are provided with a fireproof lock 8 and a fireproof bolt 9; the two door leaves 2 are symmetrically fixed on the frames at two sides of the door frame 1 through at least six fireproof hinges 3, and further, the number of the fireproof hinges 3 is 8-16; a first framework 4 is arranged around each door leaf 2, a second framework 5 is arranged in the middle of each first framework 4, each second framework 5 comprises a transverse framework 51 and a longitudinal framework 52 which are fixedly connected, and the transverse frameworks 51 and the longitudinal frameworks 52 are fixedly connected to form a criss-cross net structure; the first framework 4 and the second framework 5 are fixedly connected into a net-shaped body, a third framework 11 is arranged in the door frame 1, and the first framework 4, the second framework 5 and the third framework 11 are all made of cold-rolled galvanized steel plates; the door leaves 2 comprise galvanized steel sheets 21, the inner sides of the galvanized steel sheets 21 are provided with flame-retardant cloth surface perlite fireproof plates 22, door seam sealing pieces are arranged on the sides, which are contacted with each other when the two door leaves 2 are closed, and fireproof expansion sealing pieces are arranged between the door frame 1 and the door leaves 2; the flame-retardant cloth cover perlite fireproof plate 22 is filled in the net-shaped body formed by the first framework 4 and the second framework 5, the first framework 4 and the second framework 5 are hollow, and the back fire surface of the second framework 5 is filled with the fireproof plate 23.
Wherein the fire-proof expansion sealing element is arranged at a fire door, a fire gate and the like of a building; when a fire disaster happens and a certain specific temperature value is reached, the expansion is started, and according to different product characteristics, the expansion multiplying power can reach several times to dozens of times, so that the purpose of preventing flame and smoke from spreading to other parts of a building is achieved, and the expansion multiplying power of the fireproof expansion sealing element in the application is 8-25 times. This application is provided with the crack sealing member through the one side of contact when this two door leafs are closed, is provided with fire prevention inflation sealing member between door frame and door leaf, has guaranteed this steel thermal-insulated fire door's sealed isolated effect. Each of the fire-resistant intumescent seals herein may be a fire-resistant intumescent seal familiar to those skilled in the art that is capable of being selected to suit a fire rating depending on the intended use of the steel fire door.
The perlite fireproof board is a perlite fireproof board with a flame-retardant cloth cover, which is also called an expanded perlite fireproof board, and is a perlite thin board with the thickness of 12mm-30mm, which is prepared by taking expanded perlite particles as raw materials, mixing the raw materials with a proper amount of inorganic environment-friendly binder, internally adding a double-layer metal mesh for reinforcement, and then pressing and drying the mixture. The material has the characteristics of light apparent density, low heat conductivity coefficient, good chemical stability, wide application temperature range, small moisture absorption capacity, no toxicity, no smell, fire prevention, sound absorption and the like.
Preferably, in a preferred technical scheme of the embodiment, the fireproof plate is a straw flame-retardant plate, wherein the straw flame-retardant plate has the technical characteristics of light weight, high strength, good flame-retardant effect, low heat conductivity and the like, can meet related use requirements, is one of renewable resources, and has very important significance for comprehensive utilization of straws in China, energy conservation and environmental protection, fire safety, reduction of development of mineral resources and human health; the straw flame-retardant plate belongs to the prior art, and can be obtained by the technical personnel in the field through commercial purchase or preparation by the conventional technology in the field; for example: patent No. 201710450743.2 discloses an environment-friendly flame-retardant straw board, which comprises the following raw materials in parts by weight: 50-100 parts of straw particles, 10-200 parts of a flame retardant and 1-50 parts of a binder; the flame retardant comprises raw materials including magnesium oxide, magnesium chloride, magnesium sulfate, nano antimony oxide and ultrafine silica powder, wherein the binder is an inorganic binder, and the raw materials include alumina sol, water glass, polyvinyl alcohol and deionized water; the environment-friendly flame-retardant straw board takes straws as a main raw material, and is matched with an inorganic flame retardant and an inorganic binder with excellent performance, so that the obtained straw board is flame-retardant, non-carbonized, non-deformed, free of harmful smoke and gas generation at the high temperature of over 1200 ℃, non-heat-conducting at high temperature, non-expandable when meeting water and very excellent in comprehensive performance;
preferably, in another preferred technical solution of this embodiment, wherein the distance between the transverse frame 51 and the transverse frame 51 is the same, and the distance between the longitudinal frame 52 and the longitudinal frame 52 is the same, the door further includes an oblique frame 53, the oblique frame 53 is obliquely distributed along the door leaf at 45 °, and the oblique frame 53 is fixedly connected with the transverse frame 51 and the longitudinal frame 52 to form a net-shaped body; the oblique framework 53 provides technical support for further improving the compression resistance and deformation resistance of the door leaf.
As shown in fig. 6, preferably, in a preferred technical solution of the present embodiment, the fireproof plate 23 includes a glass magnesium fireproof substrate 231, a fireproof expansion material 232 is disposed in the glass magnesium fireproof substrate 231, and a surface of the glass magnesium fireproof substrate 231 is coated with an ammonium polyphosphate flame retardant layer 233; through set up fire prevention expanded material in glass magnesium fire prevention base plate to and set up the fire-retardant layer of ammonium polyphosphate on its surface, effectively guaranteed the fire behavior of this PLASTIC LAMINATED, provide technical support for this fire-retardant fire behavior of super large steel heat-insulating and fire-proof door.
Example 2
As shown in fig. 2 to 5, on the basis of embodiment 1, the fire-receiving surfaces of the upper and lower sides of the door frame 1 are provided with first fire-proof expansion seals 71 along the horizontal direction thereof, the fire-receiving surfaces of the left and right sides of the door frame 1 are provided with second fire-proof expansion seals 72 along the vertical direction thereof, the upper and lower sides of the door leaf 2 are provided with third fire-proof expansion seals 73 along the horizontal direction thereof, the left and right sides of the door leaf 2 are provided with fourth fire-proof expansion seals 74 along the vertical direction thereof, the first fire-proof expansion seals 71 and the third fire-proof expansion seals 73 are vertically arranged in a staggered manner, and the second fire-proof expansion seals 72 and the fourth fire-proof expansion seals 74 are vertically arranged in a staggered manner.
The door seam sealing element comprises two seam covering plates 61 arranged on a fire receiving surface and a back fire surface of the door leaf, and a fifth fireproof expansion sealing element 62 is arranged between the seam covering plates 61 and a contact surface of the door leaf 2; and a sixth fireproof expansion sealing member 63 provided in a vertical direction on a side where the two door leaves 62 are contacted when closed. According to the steel fireproof door sealing structure, the sealing effect of the internal environment and the external environment of the steel fireproof door can be effectively ensured through the crack covering plate, the first fireproof expansion sealing element, the second fireproof expansion sealing element, the third fireproof expansion sealing element, the fourth fireproof expansion sealing element, the fifth fireproof expansion sealing element and the sixth fireproof expansion sealing element; when a fire disaster occurs, the fireproof expansion sealing element actively expands to block a steel fireproof door seam gap and isolate air circulation between the two spaces, so that the damage of thick smoke, toxic gas and hot gas to a human body in the early stage of the fire disaster is effectively avoided, and the fire behavior extension is controlled; and pass through first fire prevention inflation sealing member and third fire prevention inflation sealing member set up for staggering perpendicularly, second fire prevention inflation sealing member and fourth fire prevention inflation sealing member set up for staggering perpendicularly, provide technical support for further improving this steel is thermal-insulated prevents that fire door's leakproofness provides.
Preferably, in another preferred technical solution of the present embodiment, the structures of the first fire-proof expansion seal 71, the second fire-proof expansion seal 72, the third fire-proof expansion seal 73, the fourth fire-proof expansion seal 74, the fifth fire-proof expansion seal 62 and the sixth fire-proof expansion seal 63 are: including the inside high temperature expansion silica gel strip of seting up sealed chamber, the inside fixed fire prevention expanded graphite layer that is provided with of sealed chamber. The fireproof expansion sealing element with the structure has excellent bonding performance, mechanical strength, fireproof performance and the like, wherein the bonding performance and the mechanical strength ensure the bonding stability of the fireproof expansion sealing element and a base body (a door leaf, a door frame and the like); the fire protection ensures the fire protection of the fire-resistant intumescent seal.
The high-temperature expansion silica gel strip is formed by curing an organic silicon rubber material, and the organic silicon rubber has excellent high-temperature resistance and low-temperature resistance, excellent electrical insulation property and chemical stability, good aging resistance, excellent surface activity, hydrophobicity, moisture resistance, physiological inertia and the like. Meanwhile, the organic silicon rubber has less smoke and no toxicity during combustion, low combustion heat value and low flame propagation speed, and is suitable for the requirements of good flame-retardant and fireproof performances on the materials in the aspects of aerospace, electronics, electricity, transmission lines and the like at present. The common method for silicone rubber flame retardance is to add a flame retardant into a high polymer to reduce the surface temperature of a combustion object, dilute the molecular concentration of the combustible object, cut off the supply of oxygen, form a barrier layer on the combustion surface of the silicone rubber, prevent heat energy from being transferred to the silicone rubber in depth and inhibit the temperature from rising to achieve the purpose of flame retardance; and simultaneously this high temperature expansion silica gel strip, high temperature expansion silica gel strip initiative inflation when outbreak of fire disaster, shutoff crack gap, the circulation of air between isolated two spaces, useful early dense cigarette of having avoided the conflagration, toxic gas and steam are to the harm of human body and control the intensity of a fire and extend. The fireproof expansion sealing element has excellent flame retardance, high temperature resistance, weather resistance, mechanical strength and the like, and provides technical support for the sealing and fireproof performance of the fireproof door; the fireproof expanded graphite layer is arranged in the inner cavity of the high-temperature expanded silica gel strip, so that the problems that the fireproof expanded graphite layer is exposed outside and is easy to break and drop and the like in the using process can be effectively avoided, and the technical support is provided for the performance stability of the fireproof expanded sealing element.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A reinforced ultra-large steel heat-insulation fireproof door is characterized by comprising a door frame and two door leaves, wherein the two door leaves are symmetrically fixed on frames on two sides of the door frame through at least six fireproof hinges; the periphery of each door leaf is provided with a first framework, a second framework is further arranged in the middle of each first framework, each second framework comprises a transverse framework and a longitudinal framework which are fixedly connected, the first frameworks and the second frameworks are fixedly connected into a net-shaped body, and a third framework is arranged in the door frame; the door leaves comprise galvanized steel sheets, the inner sides of the galvanized steel sheets are provided with flame-retardant cloth surface perlite fireproof plates, one sides of the two door leaves, which are contacted with each other when the two door leaves are closed, are provided with door seam sealing elements, and fireproof expansion sealing elements are arranged between the door frames and the door leaves; the flame-retardant cloth cover perlite fireproof plate is filled in a netted body formed by the first framework and the second framework, the first framework and the second framework are hollow, and the fireproof plate is filled on the back fire surface of the second framework.
2. The reinforced oversized steel heat-insulation fireproof door as claimed in claim 1, wherein the transverse frame and the transverse frame are the same in distance, the longitudinal frame and the longitudinal frame are the same in distance, the reinforced oversized steel heat-insulation fireproof door further comprises an oblique frame, the oblique frame is obliquely distributed along the door leaf for 45 degrees, and the oblique frame, the transverse frame and the longitudinal frame are fixedly connected to form a net.
3. The reinforced oversized steel heat-insulation fireproof door as claimed in claim 1, wherein the fire-receiving surfaces of the upper and lower sides of the door frame are horizontally provided with first fire-insulation expansion sealing members, the fire-receiving surfaces of the left and right sides of the door frame are vertically provided with second fire-insulation expansion sealing members, the upper and lower sides of the door leaf are horizontally provided with third fire-insulation expansion sealing members, the left and right sides of the door leaf are vertically provided with fourth fire-insulation expansion sealing members, the first fire-insulation expansion sealing member and the third fire-insulation expansion sealing member are vertically arranged in a staggered manner, and the second fire-insulation expansion sealing member and the fourth fire-insulation expansion sealing member are vertically arranged in a staggered manner.
4. The reinforced oversized steel heat-insulation fireproof door according to claim 3, wherein the door seam sealing element comprises two seam covering plates arranged on a fire receiving surface and a fire back surface of the door leaf, and a fifth fire-proof expansion sealing element is arranged between the seam covering plates and a contact surface of the door leaf; the door leaf further comprises a sixth fireproof expansion sealing piece arranged on one side, which is contacted with the two door leaves when the two door leaves are closed, in the vertical direction.
5. The reinforced oversized steel heat-insulation fireproof door according to claim 4, wherein the structures of the first fire-proof expansion sealing element, the second fire-proof expansion sealing element, the third fire-proof expansion sealing element, the fourth fire-proof expansion sealing element, the fifth fire-proof expansion sealing element and the sixth fire-proof expansion sealing element are as follows: the high-temperature expansion silica gel strip comprises a high-temperature expansion silica gel strip, wherein a sealed cavity is formed inside the high-temperature expansion silica gel strip, and a fireproof expansion graphite layer is fixedly arranged inside the sealed cavity.
6. The reinforced oversized steel heat-insulation fireproof door as claimed in claim 1, wherein a fireproof lock and a fireproof bolt are further arranged on the door leaf.
7. The reinforced oversized steel heat-insulation fireproof door according to claim 6, wherein the fireproof plate comprises a glass magnesium fireproof substrate, a fireproof expansion material is arranged in the glass magnesium fireproof substrate, and an ammonium polyphosphate flame-retardant layer is coated on the surface of the glass magnesium fireproof substrate.
8. The reinforced oversized steel heat-insulation fireproof door according to claim 1, wherein the fireproof plate is a straw flame-retardant plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123167367.7U CN216741261U (en) | 2021-12-16 | 2021-12-16 | Reinforced super-large steel heat-insulation fireproof door |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123167367.7U CN216741261U (en) | 2021-12-16 | 2021-12-16 | Reinforced super-large steel heat-insulation fireproof door |
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| CN216741261U true CN216741261U (en) | 2022-06-14 |
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| CN202123167367.7U Active CN216741261U (en) | 2021-12-16 | 2021-12-16 | Reinforced super-large steel heat-insulation fireproof door |
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