CN209742732U - Fireproof and damp-proof rolling shutter door - Google Patents
Fireproof and damp-proof rolling shutter door Download PDFInfo
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- CN209742732U CN209742732U CN201822146301.1U CN201822146301U CN209742732U CN 209742732 U CN209742732 U CN 209742732U CN 201822146301 U CN201822146301 U CN 201822146301U CN 209742732 U CN209742732 U CN 209742732U
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 238000012806 monitoring device Methods 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 14
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- 238000001514 detection method Methods 0.000 claims description 7
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- 238000007791 dehumidification Methods 0.000 claims description 4
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- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
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- 238000012544 monitoring process Methods 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008929 regeneration Effects 0.000 abstract description 2
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- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
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- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a fireproof and moistureproof rolling curtain, which comprises a base and a curtain body, wherein both sides of the curtain body are provided with slide rails for guiding the curtain body to slide; there is spool and curtain body coupling in the top of the curtain body, is provided with automatic fire extinguisher on the base in the roll curtain casing, passes through control box electric connection with high temperature alarm, and when detecting the temperature and surpassing certain threshold value, high temperature alarm sends the police dispatch newspaper, and automatic fire extinguisher blowout fire extinguishing agent is put out a fire simultaneously, and the curtain body includes sheetmetal, flame retardant coating, dampproof course. This dampproofing rolling slats door of preventing fires judges air humidity through the sensor and prevents damp, judges the different stages of conflagration through multiple sensor, and the control curtain body rises and falls to if detect near the door personnel and flee and can rise the roll curtain automatically in the scene of a fire, strive for abundant time for personnel flee, the curtain body bonds through the tie coat between each layer, and is with low costs, and resource regeneration utilization rate and comprehensive utilization rate are high, have strengthened the fire prevention and the humidity resistance of the curtain body.
Description
Technical Field
The utility model relates to a dampproofing rolling slats door of preventing fires belongs to rolling slats door technical field.
Background
The fire-proof rolling door achieves the lifting of the rolling door through a transmission device and a control system, and plays roles of fire prevention and fire insulation. The fire-proof rolling door is widely applied to fire-proof partition areas of industrial and civil buildings, can effectively organize fire spread and guarantee life and property safety, and is an indispensable fire-proof measure in modern buildings. However, the fireproof rolling shutter door in the current market does not have a damp-proof function, and can prevent fire, but can easily cause the stored materials in the warehouse to be damp and lose the original effect in rainy days, for example, the stored medicines and printed matters are easy to deteriorate and deform due to dampness, the function is influenced, the electric appliance is easy to cause short circuit and other hazards due to damp air conduction, and the fireproof rolling shutter door can prevent fire and also can prevent moisture to solve the problem.
SUMMERY OF THE UTILITY MODEL
to the above-mentioned defect that prior art exists, the utility model provides a novel dampproofing book curtain of preventing fires.
the utility model discloses an adopt following technical scheme to realize:
A fireproof and moistureproof rolling door comprises a rolling door shell (1) and a curtain body (2), wherein the rolling door shell (1) is arranged above the curtain body (2); the two sides of the curtain body (2) are provided with sliding rails (3) for guiding the curtain body (2) to slide;
also comprises a control box (4), a fire monitoring device (5) and a humidity monitoring device (6),
the control box (4), the fire monitoring device (5) and the humidity monitoring device (6) are all arranged on a wall body on one side of the curtain body (2);
The fire monitoring device (5) comprises an automatic fire extinguisher (5.1), a high-temperature alarm (5.2) and a smoke-sensitive alarm (5.3), and the automatic fire extinguisher (5.1), the high-temperature alarm (5.2) and the smoke-sensitive alarm (5.3) are all electrically connected with the control box (4);
The humidity monitoring device (6) comprises a humidity sensor (6.1) and a dehumidification device (6.2), a heating wire (6.2.1) is arranged in the dehumidification device (6.2), the heating wire (6.2.1) and the humidity sensor (6.1) are electrically connected with the control box (4), and when the humidity in the room is detected to be too high, the humidity sensor (6.1) transmits data to the control box (4) to control the power supply to heat the heating wire (6.2.1) to remove damp;
The rolling shutter shell (1) comprises a base (1.1), a shell (1.2) and a scroll (1.3),
The base (1.1) is arranged at the bottom of the roller shutter shell (1) and fixedly connected with a wall surface, the shell (1.2) is detachably fixed above the base (1.1), a notch (1.2.1) for the curtain body (2) to pass through is formed in the lower side of the shell (1.2), the reel (1.3) is arranged inside the roller shutter shell (1), and a chain (1.3.1) is arranged on the reel (1.3) and can control the lifting of the curtain body (2);
The curtain body (2) comprises a metal sheet layer (2.1), a fire-proof layer (2.2) and a moisture-proof layer (2.3),
the metal sheet layers (2.1) are connected by a concave-convex structure, and the surfaces of the metal sheet layers are coated with fireproof coatings (2.1.1);
The fire-proof layer (2.2) comprises a fire-proof layer (2.2.1) and a smoke-filtering layer (2.2.2);
the moisture-proof layer (2.3) comprises a moisture-removing layer (2.3.1) and a water-resisting layer (2.3.2), wood chips are filled in the moisture-removing layer (2.3.1), the electric heating wire (6.2.1) is attached to the wood chips, and the end part of the electric heating wire is communicated with a power supply;
Preferably, the reel (1.3) is driven by a motor (1.4) to drive the curtain body (2) to rotate forward and reversely; the motor (1.4) is arranged inside the roller shutter shell (1) and is electrically connected with the control box (4).
preferably, the metal sheet layer (2.1), the fireproof layer (2.2) and the moisture-proof layer (2.3) are bonded through an adhesive layer (7), and the thickness of the adhesive layer (7) is 3-6 mm.
Preferably, control box (4) include programmable controller (4.1), alarm control circuit (4.2), motor control circuit (4.3), converter (4.4), OLED display screen (4.5), STM32 singlechip (4.6), and control box (4) adopt STM32 singlechip control, and the data that will detect are transmitted to the STM32 singlechip by each sensor through the bluetooth and are handled.
Preferably, the material of the roller blind housing (1) is 303 stainless steel.
Preferably, the fire monitoring device (5) further comprises a pyroelectric infrared sensor (5.4) and a flame detection sensor (5.5).
preferably, the automatic fire extinguisher (5.1) is also provided with a square container (5.1.1) filled with foam extinguishing agent, the square container (5.1.1) is connected with a horizontal pipeline (5.1.2), the pipeline (5.1.2) is provided with a nozzle (5.1.3), and when an indoor fire is detected, the nozzle (5.1.3) is opened to extinguish the fire.
Preferably, the control box (4) is connected with a remote controller through Bluetooth, and a user can observe the environment state and the use state in real time through the remote controller.
preferably, the fire-proof medium filled in the fire-proof layer (2.2.1) is glass beads or sand grains coated with fire-proof paint on the surface.
Preferably, the water-resisting layer (2.3.2) is a water-resisting cloth made of polyethylene as a main raw material; the material of the metal sheet layer (2.1) is 303 stainless steel.
The utility model has the advantages that: the utility model discloses dampproofing rolling slats door of preventing fires judges air humidity through the sensor and prevents damp, judges the different stages of conflagration through multiple sensor, and the control curtain body rises to if detect near the door in the scene of a fire and have personnel to flee and can rise the roll curtain automatically, strive for abundant time for personnel flee, bond through the tie coat between each layer of the curtain body, the tie coat is made by magnesium oxide, magnesium chloride, stopping, wood fiber powder, ferrous sulfate mixture, and the stopping is sawdust, rice husk, crop straw and fly ash, the extensive low cost in material source, and resource regeneration utilization rate and comprehensive utilization rate are high, have strengthened the fire prevention and the humidity resistance of the curtain body.
drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings.
FIG. 1 is an overall structure effect diagram of the present invention;
FIG. 2 is a cross-sectional view of the roller shade housing of the present invention;
FIG. 3 is a schematic view of the internal structure of the fire monitoring device of the present invention;
FIG. 4 is a schematic view of the internal structure of the humidity monitoring device of the present invention;
FIG. 5 is a cross-sectional view of the curtain of the present invention;
fig. 6 is a schematic diagram of the internal structure of the control box of the present invention.
in the figure: roll up curtain casing (1), base (1.1), casing (1.2), notch (1.2.1), spool (1.3), chain (1.3.1), motor (1.4), curtain body (2), sheetmetal (2.1), fire-retardant coating (2.1.1), flame retardant coating (2.2), fire barrier (2.2.1), smoke filter (2.2.2), dampproof course (2.3), remove damp layer (2.3.1), water barrier (2.3.2), slide rail (3), control box (4), programmable controller (4.1), alarm control circuit (4.2), motor control circuit (4.3), converter (4.4), OLED display screen (4.5), STM32 (4.6), fire monitoring device (5) automatic fire extinguisher (5.1), square container (5.1.1), pipeline (5.1.2), high temperature alarm (5.1.3), the alarm (5.5.5.5.5) of high temperature, the temperature detector (5.5.6), the fire detection device (5.5.1), the infrared temperature detector (5.5.6), the fire detection device (5.1) of fire detection device, the infrared temperature detector (5.1), the alarm, the fire detector (5.1) is released the temperature detector (, Humidity inductor (6.1), moisture removing device (6.2), electric heating wire (6.2.1), bonding layer (7)
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for purposes of illustration only and are not intended to limit the scope of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of the present invention.
The first embodiment is as follows:
As shown in fig. 1, a fireproof and moistureproof rolling door comprises a rolling door shell (1), a door body (2), a sliding rail (3), a control box (4), a fire monitoring device (5) and a humidity monitoring device (6), wherein the rolling door shell (1) is arranged above the door body (2); the two sides of the curtain body (2) are provided with slide rails (3) for guiding the curtain body (2) to slide. The fire curtain is characterized by further comprising a control box (4), a fire monitoring device (5) and a humidity monitoring device (6), wherein the control box (4), the fire monitoring device (5) and the humidity monitoring device (6) are all installed on the wall body on the right side of the curtain body (2).
as shown in fig. 1 and 2, the roller shutter casing (1) comprises a base (1.1), a casing (1.2) and a scroll (1.3), wherein the material of the roller shutter casing (1) is 303 stainless steel, the base (1.1) is arranged at the bottom of the roller shutter casing (1) and is fixedly connected with the wall surface, the casing (1.2) is detachably fixed above the base (1.1), a notch (1.2.1) for the curtain body (2) to pass through is formed in the lower side of the casing (1.2), the scroll (1.3) is arranged inside the roller shutter casing (1), and a chain (1.3.1) is arranged on the scroll (1.3) to control the lifting of the curtain body (2). The roller shutter is characterized in that a motor (1.4) is arranged inside the roller shutter shell (1) and electrically connected with a control box (4), and a scroll (1.3) is driven by the motor (1.4) to drive the shutter body (2) to rotate in the forward and reverse directions.
the fire monitoring device (5) comprises an automatic fire extinguisher (5.1), a high-temperature alarm (5.2) and a smoke sensing alarm (5.3), wherein the automatic fire extinguisher (5.1), the high-temperature alarm (5.2) and the smoke sensing alarm (5.3) are all electrically connected with the control box (4). The fire monitoring device (5) further comprises a pyroelectric infrared sensor (5.4) and a flame detection sensor (5.5). The automatic fire extinguisher (5.1) is also provided with a square container (5.1.1) filled with foam extinguishing agent, the square container (5.1.1) is connected with a horizontal pipeline (5.1.2), the pipeline (5.1.2) is provided with a nozzle (5.1.3), and when an indoor fire is detected, the nozzle (5.1.3) is opened to extinguish the fire.
As shown in fig. 4, the humidity monitoring device (6) includes a humidity sensor (6.1) and a dehumidifying device (6.2), an electric heating wire (6.2.1) is disposed in the dehumidifying device (6.2), the electric heating wire (6.2.1) and the humidity sensor (6.1) are electrically connected to the control box (4), and when the indoor humidity is detected to be too high, the humidity sensor (6.1) transmits data to the control box (4) to control the power supply to heat the electric heating wire (6.2.1) to drive damp;
as shown in fig. 5, the curtain body (2) comprises a metal sheet layer (2.1), a fire-proof layer (2.2) and a moisture-proof layer (2.3), wherein the metal sheet layer (2.1) is connected by a concave-convex structure, and the surface of the metal sheet layer is coated with a fire-proof coating (2.1.1); the fire-proof layer (2.2) comprises a fire-proof layer (2.2.1) and a smoke-filtering layer (2.2.2); the dampproof course (2.3) is filled with the saw-dust including removing damp course (2.3.1) and water barrier (2.3.2), removing damp course (2.3.1) intussuseption, heating wire (6.2.1) are attached to on the saw-dust, and the tip UNICOM of heating wire has the power. Bond through tie coat (7) between sheetmetal (2.1), flame retardant coating (2.2) and dampproof course (2.3), tie coat (7) thickness is 3 ~ 6 mm. The fire-proof medium filled in the fire-proof layer (2.2.1) is glass beads or sand grains coated with fire-proof paint on the surface. The water-resisting layer (2.3.2) is water-resisting cloth made of polyethylene as a main raw material; the material of the metal sheet layer (2.1) is 303 stainless steel.
As shown in figure 6, the control box (4) comprises a programmable controller (4.1), an alarm control circuit (4.2), a motor control circuit (4.3), a frequency converter (4.4), an OLED display screen (4.5) and an STM32 single chip microcomputer (4.6), the control box (4) is controlled by the STM32 single chip microcomputer, and detected data are transmitted to the STM32 single chip microcomputer through Bluetooth to be processed by each sensor.
The control box (4) is connected with the remote controller through Bluetooth, and a user can observe the environment state and the use state in real time through the remote controller.
the utility model discloses a dampproofing book curtain of preventing fires can heat the heater strip through humidity inductor (6.1) the different situation of sensing air humidity and drive damp, can carry out different actions in the different stages of conflagration again, in high temperature alarm (5.2), smoke detector alarm (5.3), when arbitrary sensors such as thermal release infrared sensor (5.4) detected unusually, roll up the curtain and descend half, both can block the toxic gas that space top conflagration produced and do not hinder personnel's flame detection sensor (5.5) and flee and directly descend to the lowest when detecting flame and roll up the curtain door, prevent that flame from stretching fire door.
The system comprises a plurality of switches for dealing with different service environments, and comprises a controller key switch, a 315 million remote control unit, a manual pulling chain (1.3.1) switch during power-off, a pyroelectric infrared automatic intelligent switch and a pyroelectric infrared sensor, wherein the pyroelectric infrared sensor is used for automatically opening the door when a person falls down completely.
This system starts audible-visual annunciator when detecting fire signal, it also can show on the OLED screen of controller to detect when air humidity exceeds standard, and the condition around the dampproofing rolling slats door of fire prevention shows, staff can in time see the parameter that arouses unusually when taking place, can in time discover and handle the potential safety hazard, audible-visual annunciator and OLED screen combine to use can know the accident situation fast, know unusual source, compare traditional fire prevention rolling slats door, this dampproofing rolling slats door of fire prevention can reduce the conflagration emergence more effectively, can also reduce air humidity, reduce economic loss and the conflagration that the even electricity produced that the humidity brought, the use field is also more extensive.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (10)
1. a fireproof and moistureproof rolling door comprises a rolling door shell (1) and a curtain body (2), wherein the rolling door shell (1) is arranged above the curtain body (2); the two sides of the curtain body (2) are provided with sliding rails (3) for guiding the curtain body (2) to slide; a notch (1.2.1) for the curtain body (2) to pass through is formed in the lower side of the rolling curtain shell (1); it is characterized by also comprising a control box (4), a fire monitoring device (5) and a humidity monitoring device (6),
The control box (4), the fire monitoring device (5) and the humidity monitoring device (6) are all arranged on a wall body on one side of the curtain body (2);
the fire monitoring device (5) comprises an automatic fire extinguisher (5.1), a high-temperature alarm (5.2) and a smoke-sensitive alarm (5.3), and the automatic fire extinguisher (5.1), the high-temperature alarm (5.2) and the smoke-sensitive alarm (5.3) are all electrically connected with the control box (4);
The humidity monitoring device (6) comprises a humidity sensor (6.1) and a dehumidification device (6.2), an electric heating wire (6.2.1) is arranged in the dehumidification device (6.2), the electric heating wire (6.2.1) and the humidity sensor (6.1) are electrically connected with the control box (4), and when the indoor humidity is detected to be overhigh, the humidity sensor (6.1) transmits data to the control box (4) to control the power supply to heat the electric heating wire (6.2.1) to remove the humidity;
The rolling shutter shell (1) comprises a base (1.1), a shell (1.2) and a scroll (1.3),
the base (1.1) is arranged at the bottom of the roller shutter shell (1) and fixedly connected with a wall surface, the shell (1.2) is detachably fixed above the base (1.1), a notch (1.2.1) for the curtain body (2) to pass through is formed in the lower side of the shell (1.2), the reel (1.3) is arranged inside the roller shutter shell (1), and a chain (1.3.1) is arranged on the reel (1.3) and can control the lifting of the curtain body (2);
The curtain body (2) comprises a metal sheet layer (2.1), a fire-proof layer (2.2) and a moisture-proof layer (2.3),
The metal sheet layers (2.1) are connected by a concave-convex structure, and the surfaces of the metal sheet layers are coated with fireproof coatings (2.1.1);
The fire-proof layer (2.2) comprises a fire-proof layer (2.2.1) and a smoke filter layer (2.2.2);
The dampproof course (2.3) are filled with the saw-dust including removing damp course (2.3.1) and water barrier (2.3.2), remove damp course (2.3.1) intussuseption, heating wire (6.2.1) are attached to on the saw-dust, and the tip UNICOM of heating wire has the power.
2. A fire and moisture resistant roller shutter door as claimed in claim 1, wherein said roller (1.3) is driven by a motor (1.4) to rotate the shutter body (2) in forward and reverse directions; the motor (1.4) is arranged inside the roller shutter shell (1) and is electrically connected with the control box (4).
3. A fire and moisture resistant roller door as claimed in claim 1, wherein said sheet metal layer (2.1), said fire barrier layer (2.2) and said moisture resistant layer (2.3) are bonded together by a bonding layer (7), said bonding layer (7) having a thickness of 3 to 6 mm.
4. a fire and moisture resistant roller shutter door as claimed in claim 1, wherein said control box (4) comprises a programmable controller (4.1), an alarm control circuit (4.2), a motor control circuit (4.3), a frequency converter (4.4), an OLED display screen (4.5), and an STM32 single chip microcomputer (4.6), the control box (4) is controlled by an STM32 single chip microcomputer, and the detected data is transmitted to the STM32 single chip microcomputer by each sensor through bluetooth for processing.
5. a fire and moisture resistant roller shutter door as claimed in claim 1, wherein the material of said shutter housing (1) is 303 stainless steel.
6. a fire and moisture resistant roller door as claimed in claim 1, characterised in that said fire monitoring means (5) further comprises a pyroelectric infrared sensor (5.4), a flame detection sensor (5.5).
7. a fire and moisture resistant roller door as claimed in claim 1, wherein said automatic fire extinguisher (5.1) is further provided with a square container (5.1.1) containing a foam fire extinguishing agent, said square container (5.1.1) is connected with a horizontal pipe (5.1.2) and provided with a nozzle (5.1.3) on the pipe (5.1.2), and when an indoor fire is detected, the nozzle (5.1.3) is opened to extinguish the fire.
8. A fire and moisture resistant rolling door as claimed in claim 1, wherein said control box (4) is connected to a remote controller via bluetooth, and a user can observe the environment status and the using status in real time via the remote controller.
9. A fire and moisture resistant roller door as claimed in claim 1, wherein said fire barrier layer (2.2.1) is filled with fire barrier medium such as glass beads or sand coated with fire retardant coating.
10. a fire and moisture resistant roller door as claimed in claim 1, wherein said water barrier (2.3.2) is a water barrier cloth made of polyethylene as a main material; the material of the metal sheet layer (2.1) is 303 stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822146301.1U CN209742732U (en) | 2018-12-20 | 2018-12-20 | Fireproof and damp-proof rolling shutter door |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822146301.1U CN209742732U (en) | 2018-12-20 | 2018-12-20 | Fireproof and damp-proof rolling shutter door |
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| Publication Number | Publication Date |
|---|---|
| CN209742732U true CN209742732U (en) | 2019-12-06 |
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| CN201822146301.1U Active CN209742732U (en) | 2018-12-20 | 2018-12-20 | Fireproof and damp-proof rolling shutter door |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984831A (en) * | 2019-12-31 | 2020-04-10 | 河南大唐消防科技有限公司 | Intelligent escape fireproof rolling shutter door |
| CN112648419A (en) * | 2020-12-14 | 2021-04-13 | 武汉锐达顺通风工程设备制造有限公司 | Installation process of fireproof smoke exhaust valve and fireproof smoke exhaust valve |
-
2018
- 2018-12-20 CN CN201822146301.1U patent/CN209742732U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984831A (en) * | 2019-12-31 | 2020-04-10 | 河南大唐消防科技有限公司 | Intelligent escape fireproof rolling shutter door |
| CN112648419A (en) * | 2020-12-14 | 2021-04-13 | 武汉锐达顺通风工程设备制造有限公司 | Installation process of fireproof smoke exhaust valve and fireproof smoke exhaust valve |
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