CN114412313A - Evacuation fireproof door suitable for people with mobility disabilities and use method thereof - Google Patents

Evacuation fireproof door suitable for people with mobility disabilities and use method thereof Download PDF

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Publication number
CN114412313A
CN114412313A CN202210102929.XA CN202210102929A CN114412313A CN 114412313 A CN114412313 A CN 114412313A CN 202210102929 A CN202210102929 A CN 202210102929A CN 114412313 A CN114412313 A CN 114412313A
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CN
China
Prior art keywords
door
electromagnet
evacuation
piston
way electromagnetic
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Granted
Application number
CN202210102929.XA
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Chinese (zh)
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CN114412313B (en
Inventor
李静
蔡明威
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Xiamen Hordor Architecture & Engineering Design Group Co ltd
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Xiamen Hordor Architecture & Engineering Design Group Co ltd
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Priority to CN202210102929.XA priority Critical patent/CN114412313B/en
Publication of CN114412313A publication Critical patent/CN114412313A/en
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Publication of CN114412313B publication Critical patent/CN114412313B/en
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F3/00—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices
    • E05F3/04—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with liquid piston brakes
    • E05F3/10—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with liquid piston brakes with a spring, other than a torsion spring, and a piston, the axes of which are the same or lie in the same direction
    • E05F3/102—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with liquid piston brakes with a spring, other than a torsion spring, and a piston, the axes of which are the same or lie in the same direction with rack-and-pinion transmission between driving shaft and piston within the closer housing
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F3/00—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices
    • E05F3/04—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with liquid piston brakes
    • E05F3/12—Special devices controlling the circulation of the liquid, e.g. valve arrangement
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor

Abstract

The invention relates to an evacuation fireproof door suitable for people with mobility disabilities and a using method thereof, the evacuation fireproof door comprises a door frame and a door leaf, the door leaf is embedded and hinged in the door frame to form an openable structure, the evacuation fireproof door also comprises a door closer, and the door closer comprises: the device comprises a main shell, a return spring, a piston, a gear shaft, a flow promoting mechanism and a pressure promoting mechanism. The opening and closing actions of the one-way electromagnetic valve of the flow promoting mechanism and the electromagnet of the pressure promoting mechanism in the door closer are controlled, the automatic closing of the fireproof door can be guaranteed, the flowing resistance of hydraulic oil is safely and stably reduced, the compression of a reset spring is accelerated, the acting force required to be applied by a user to open the door is reduced, and therefore the door leaf is quickly and lightly opened by the user with small force such as children, old people or patients, and the door leaf is effectively convenient to open and pass through the fireproof door on the basis that the fire retardant effect is not influenced.

Description

Evacuation fireproof door suitable for people with mobility disabilities and use method thereof
Technical Field
The invention relates to the technical field of fireproof doors, in particular to an evacuation fireproof door suitable for people with mobility disabilities and a using method thereof.
Background
The existing fireproof door for evacuation generally comprises a door frame, a door leaf and a door closer connected between the door frame and the door leaf, and the door leaf is ensured to be always in a closed state through the arrangement of the door closer, so that the fireproof effect is effectively formed. However, the arrangement of the door closer also results in a more obvious defect that: the door opener need exert great effort just can open the door leaf of preventing fire door, to some special crowds, for example child, old man, or personnel such as the inconvenient person of action (sitting the wheelchair), because of its strength is less, often can't push away current fire door alone or can't push away fast, leads to the use of preventing fire door to have the potential safety hazard.
Therefore, on the basis of not influencing the fire retardant effect, the invention aims to design the fire door for evacuation, which can be effectively and conveniently opened and passed by people with inconvenience in movement.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a fire door for evacuation suitable for a handicapped person, which can effectively solve the above problems in the prior art.
The technical scheme of the invention is as follows:
the utility model provides a fire door is prevented with evacuation suitable for handicapped person, includes door frame and door leaf, but the articulated setting of door leaf embedding forms the structure of opening and close at the door frame, fire door is prevented with evacuating still includes the door closer, the door closer includes:
the door comprises a main shell, a door frame and a door body, wherein the main shell is fixedly arranged on the door frame, a hollow cavity and a sealing cavity which are mutually communicated are arranged in the main shell from left to right, hydraulic oil is filled in the hollow cavity, and a backflow passage which is communicated with the left side and the right side of the hollow cavity is arranged at the upper end of the main shell; a piston is movably arranged on the left side of the hollow cavity, and a return spring is arranged at the right end of the piston in the hollow cavity; a corresponding rack is arranged on the left side of the piston, a gear shaft is rotatably connected above the piston through the meshing of the racks, and the gear shaft is connected with the door leaf through a swing arm and a connecting rod which are hinged with each other;
the flow promoting mechanism is used for reducing the flow resistance of the hydraulic oil and comprises flow promoting channels which are arranged above the backflow channel and communicated with the left side and the right side of the hollow cavity, and one-way electromagnetic valves allowing the hydraulic oil to flow from right to left are arranged in the flow promoting channels;
the pressure-boosting mechanism is used for accelerating the compression of the reset spring and further reducing the flow resistance of hydraulic oil, the pressure-boosting mechanism comprises a pulling shaft penetrating through the reset spring, the pulling shaft can movably span between the hollow cavity and the sealed cavity, one end of the pulling shaft is fixedly connected with the piston, the other end of the pulling shaft extends into the sealed cavity and is connected with a steel plate, and an electromagnet matched with the steel plate is arranged at the right end of the sealed cavity.
The fireproof door for evacuation further comprises a control system for controlling the opening and closing of the electromagnet and the one-way electromagnetic valve, and the control system is connected with a personnel identification module outwards.
The personnel identification module is a pressure sensor which is fixedly arranged below the middle part of the door leaf.
Or, the personnel identification module is an infrared sensor or a camera, and the infrared sensor or the camera is fixedly arranged below the middle part of the door frame.
The pipe aperture of the flow promotion channel is larger than that of the return channel.
The attraction force of the electromagnet to the steel plate is smaller than the elastic force of the reset spring.
The one end of main casing body installation piston and the one end of installation electro-magnet all can be dismantled sealing connection and have corresponding end cover.
A use method of a fire door for evacuation suitable for people with mobility disabilities comprises the following specific use steps:
s1: the electromagnet and the one-way electromagnetic valve are in a normally closed state;
s2: judging whether a person needs to pass through the fire door for evacuation or not through the person identification module, and if not, continuously keeping the electromagnet and the one-way electromagnetic valve in a normally closed state; if yes, go to step S3;
s3: transmitting personnel signals to a control system, and controlling the opening of a one-way electromagnetic valve and the adsorption of an electromagnet on a steel plate through the control system;
s4: after the one-way electromagnetic valve is opened and the electromagnet is electrified for 4-6S, the control system controls the one-way electromagnetic valve to be closed and the electromagnet to be powered off;
s5: the return spring drives the piston to move left under the action of elastic potential energy and drives the gear shaft to rotate so as to automatically close the door leaf.
The invention has the advantages that:
1) the door leaf opening and closing device can safely and stably reduce the flow resistance of hydraulic oil and accelerate the compression of the return spring on the basis of ensuring the automatic closing of the fire door by controlling the opening and closing actions of the one-way electromagnetic valve of the flow promoting mechanism and the electromagnet of the pressure promoting mechanism in the door closer, so that the acting force required by a user to open the door is reduced, and the door leaf can be quickly and conveniently opened by people with inconvenient actions, such as children, old people or patients with small strength, so that the door leaf can be effectively opened by the people with inconvenient actions and can pass through the fire door on the basis of not influencing the fire retardant effect.
2) The flow promoting mechanism comprises flow promoting channels which are arranged above the return channel and communicated with the left side and the right side of the hollow cavity, and one-way electromagnetic valves which allow hydraulic oil to flow from right to left are arranged in the flow promoting channels; when the door is opened, the one-way electromagnetic valve is controlled to be opened so as to increase the flow cross-sectional area of hydraulic oil when the door is opened, namely, the flow of the hydraulic oil when the door is opened is increased, so that the speed of the hydraulic oil flowing from the right cavity to the left cavity of the hollow cavity is effectively accelerated, the hydraulic resistance is reduced, and the force application requirement of opening the door leaf is reduced.
3) The invention further adds a pressure-promoting mechanism for accelerating the compression of a return spring and further reducing the flow resistance of hydraulic oil on the basis of a flow-promoting mechanism, wherein the pressure-promoting mechanism comprises a drawing shaft penetrating through the return spring, the drawing shaft can movably span between a hollow cavity and a sealed cavity, one end of the drawing shaft is fixedly connected with a piston, the other end of the drawing shaft extends into the sealed cavity and is connected with a steel plate, and the right end of the sealed cavity is fixedly provided with an electromagnet matched with the steel plate; utilize the electro-magnet circular telegram to adsorb the steel sheet and stimulate the piston to form the compression to reset spring, in order to alleviate the required application of force of reset spring compression, and can drive the piston and further form the extrusion to hydraulic oil, thereby with the cooperation of the hydraulic pressure oil runner of increase, in order to further alleviate hydraulic resistance, thereby further effectively reduce the application of force requirement that the door leaf opened by a wide margin.
4) According to the invention, the personnel identification module is utilized to identify personnel, feed back information and carry out overall control through the control system, so that when personnel need to pass through the fireproof door, the one-way electromagnetic valve is opened and the electromagnet is electrified in time, and the force application requirement for opening the door leaf is reduced; on the basis, the invention further controls the following steps through the control system: after the one-way electromagnetic valve is opened and the electromagnet is electrified for 4-6 seconds, the closing and the power failure are carried out, so that the door leaf is automatically closed under the action of the elastic potential energy of the reset spring, the closing process of the door leaf and the closing effect after the closing are completely unaffected, and the automatic intelligent control of the invention is effectively realized on the premise of ensuring the use effect, namely ensuring that the fire retardant effect is not affected at all.
5) The pipe aperture of the flow promotion channel is larger than that of the return channel. On the one hand, the flow of hydraulic oil during door opening can be accelerated, labor-saving door opening is facilitated, on the other hand, hydraulic oil only flows back from the backflow channel due to the one-way arrangement of the flow promoting channel during backflow, the door can be closed stably, safely and slowly, door closing buffering is achieved, and the stability of door closing is ensured.
6) The end of the main shell, which is provided with the piston, and the end, which is provided with the electromagnet, can be detachably and hermetically connected with corresponding end covers, so that the disassembly and the maintenance of each part in the door closer are facilitated, the sealing performance of the hollow cavity can be ensured, and the stable operation of each part is ensured.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the door closer of the present invention.
FIG. 3 is a flow chart of a method of use of embodiment 1 of the present invention.
Fig. 4 is a flow chart of a method of use of embodiment 2 of the present invention.
FIG. 5 is a flow chart of a method of use of embodiment 3 of the present invention.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings:
the first embodiment is as follows:
referring to fig. 1-2, a fire door for evacuation suitable for the handicapped includes a door frame 1 and a door leaf 2, the door leaf 2 is embedded and hinged in the door frame 1 to form an openable and closable structure, the fire door for evacuation further includes a door closer 3, the door closer 3 includes:
the door frame comprises a main shell 6, a fixing device is arranged on the door frame 1, a hollow cavity 7 and a sealing cavity 8 which are communicated with each other are arranged on the left and right sides in the main shell 6, hydraulic oil is filled in the hollow cavity 7, and a backflow passage 13 communicated with the left side and the right side of the hollow cavity 7 is arranged at the upper end of the main shell 6; a piston 9 is movably mounted on the left side of the hollow cavity 7, and a return spring 10 is mounted at the right end of the piston 9 in the hollow cavity 7; a corresponding rack is arranged on the left side of the piston 9, a gear shaft 12 is rotatably connected above the piston 9 through the meshing of the racks, and the gear shaft 12 is connected with the door leaf 2 through a swing arm 1201 and a connecting rod 1202 which are hinged with each other (in the use process, the main shell 6 can be installed on the door leaf 2 according to the requirement, and the connecting rod 1202 is installed on the door frame 1);
the flow promoting mechanism is used for reducing the flow resistance of hydraulic oil, the flow promoting mechanism comprises a flow promoting channel 15 which is arranged above the return channel 13 and communicated with the left side and the right side of the hollow cavity 7, and a one-way electromagnetic valve 16 which allows the hydraulic oil to flow from right to left is arranged in the flow promoting channel 15;
the pressure-boosting mechanism is used for accelerating the compression of the return spring 10 and further relieving the flow resistance of hydraulic oil, and comprises a pulling shaft 14 penetrating through the return spring 10, wherein the pulling shaft 14 can movably span between the hollow cavity 7 and the sealed cavity 8, and the pulling shaft 14 is in sealing connection with the main shell 6 between the hollow cavity 7 and the sealed cavity 8 through a sealing ring 5; one end of the pulling shaft 14 is fixedly connected with the piston 9, the other end of the pulling shaft extends into the sealed cavity 8 and is connected with the steel plate 4, and the electromagnet 11 matched with the steel plate 4 is arranged at the right end of the sealed cavity 8.
The fire door for evacuation further comprises a control system (the control system in the embodiment adopts a programmable PLC (programmable logic controller) encoder) for controlling the opening and closing of the electromagnet 11 and the one-way electromagnetic valve 16, and the control system is externally connected with a personnel identification module.
The personnel identification module is a pressure sensor which is fixedly arranged below the middle part of the door leaf 2.
The orifice diameter of the flow promotion channel 15 is larger than that of the return channel 13. The attraction force of the electromagnet 11 to the steel plate 4 is smaller than the elastic force of the return spring 10.
The one end of main casing 6 installation piston 9 and the one end of installation electro-magnet 11 all can be dismantled sealing connection and have corresponding end cover 17, electro-magnet 11 is installed in the end cover 17 inside wall of seal chamber 8 one side, and electro-magnet 11 runs through with the cable and extends to the outside of end cover 17.
Referring to fig. 3, the method for using the fire door for evacuation suitable for the handicapped includes the following specific steps:
the control system of the invention is connected to a fire alarm system of a building, when the fire alarm system identifies a fire, a signal is transmitted to the control system, the control system enters a starting state, and the working process of the electromagnet 11 and the one-way valve 16 is controlled according to the following control processes:
s1: the electromagnet 11 and the one-way electromagnetic valve 16 are in a normally closed state;
s2: judging whether a person needs to pass through the fire door for evacuation or not through the pressure sensor, judging whether the pressure value of the pressure sensor is not increased when the pressure sensor is not pressed, and keeping the electromagnet 11 and the one-way electromagnetic valve 16 in a normally closed state at the moment if the pressure sensor is judged to be not increased; if the pressure sensor is pressed and the pressure value rises above 20N, the process proceeds to step S3;
s3: the personnel signal is transmitted to the control system, and the control system controls the one-way electromagnetic valve 16 to be opened and the electromagnet 11 to be electrified to adsorb the steel plate 4;
s4: after the one-way electromagnetic valve 16 is opened and the electromagnet 11 is electrified for 5S, the control system controls the one-way electromagnetic valve 16 to be closed and the electromagnet 11 to be powered off;
s5: the return spring 10 drives the piston 9 to move left under the action of elastic potential energy, and drives the gear shaft 12 to rotate to automatically close the door leaf 2.
Example two:
referring to fig. 4, the present embodiment is different from the first embodiment in that: the personnel identification module is an infrared sensor which is fixedly arranged below the middle part of the door frame 1. The identification process comprises the following steps: when the infrared sensor is not shielded by the passing personnel, judging whether the infrared sensor is shielded by the passing personnel; and when the infrared sensor is shielded by the passing person, the judgment is yes.
It should be noted that, the implementation principle and the resulting technical effects of the embodiment are the same as those of the first embodiment, and for the sake of brief description, reference may be made to corresponding contents of the first embodiment.
Example three:
referring to fig. 5, the present embodiment is different from the first embodiment in that: personnel identification module is the camera, the camera fixed set up in below the middle part of door frame 1. The identification process comprises the following steps: when the camera does not shoot that a person passes by, judging whether the camera is negative; and when the camera shoots that a person passes through, the judgment is yes.
It should be noted that, the implementation principle and the resulting technical effects of the embodiment are the same as those of the first embodiment, and for the sake of brief description, reference may be made to corresponding contents of the first embodiment.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The utility model provides an sparse prevent fire door with suitable for handicapped person, includes door frame (1) and door leaf (2), but door leaf (2) embedding hinge sets up and forms opening and close structure, its characterized in that in door frame (1): fire door is still including door closer (3) to sparse with preventing, door closer (3) include:
the door frame comprises a main shell (6) and a door frame body (1), wherein the main shell (6) is fixedly arranged on the door frame body (1), a hollow cavity (7) and a sealing cavity (8) which are communicated with each other are arranged on the left and right sides in the main shell (6), hydraulic oil is filled in the hollow cavity (7), and a backflow passage (13) communicated with the left side and the right side of the hollow cavity (7) is arranged at the upper end of the main shell (6); a piston (9) is movably mounted on the left side of the hollow cavity (7), and a return spring (10) is arranged at the right end of the piston (9) in the hollow cavity (7); a corresponding rack is arranged on the left side of the piston (9), a gear shaft (12) is meshed with the upper part of the piston (9) through the rack and is rotationally connected with the upper part of the piston, and the gear shaft (12) is connected with the door leaf (2) through a swing arm (1201) and a connecting rod (1202) which are hinged with each other;
the flow promoting mechanism is used for reducing the flow resistance of the hydraulic oil, the flow promoting mechanism comprises flow promoting channels (15) which are arranged above the return channel (13) and communicated with the left side and the right side of the hollow cavity (7), and one-way electromagnetic valves (16) allowing the hydraulic oil to flow from right to left are arranged in the flow promoting channels (15);
the pressure boosting mechanism is used for accelerating compression of the return spring (10) and further reducing circulation resistance of hydraulic oil, the pressure boosting mechanism comprises a pulling shaft (14) penetrating the return spring (10), the pulling shaft (14) can movably span between the hollow cavity (7) and the sealed cavity (8), one end of the pulling shaft (14) is fixedly connected with the piston (9), the other end of the pulling shaft extends into the sealed cavity (8) and is connected with a steel plate (4), and an electromagnet (11) matched with the steel plate (4) is arranged at the right end fixing device of the sealed cavity (8).
2. An evacuation fire door adapted for use by a handicapped person according to claim 1, characterized in that: the fireproof door for evacuation further comprises a control system for controlling the opening and closing of the electromagnet (11) and the one-way electromagnetic valve (16), and the control system is connected with a personnel identification module outwards.
3. An evacuation fire door adapted for use by a handicapped person according to claim 2, characterized in that: the personnel identification module is a pressure sensor which is fixedly arranged below the middle part of the door leaf (2).
4. An evacuation fire door adapted for use by a handicapped person according to claim 2, characterized in that: the personnel identification module is an infrared sensor or a camera, and the infrared sensor or the camera is fixedly arranged below the middle part of the door frame (1).
5. An evacuation fire door adapted for use by a handicapped person according to claim 1, characterized in that: the pipe aperture of the flow promoting channel (15) is larger than that of the return channel (13).
6. An evacuation fire door adapted for use by a handicapped person according to claim 1, characterized in that: the attraction force of the electromagnet (11) to the steel plate (4) is smaller than the elastic force of the return spring (10).
7. An evacuation fire door adapted for use by a handicapped person according to claim 1, characterized in that: one end of the main shell (6) where the piston (9) is arranged and one end of the main shell where the electromagnet (11) is arranged can be both detachably and hermetically connected with a corresponding end cover (17).
8. The method of claim 2, further comprising the following steps:
s1: the electromagnet (11) and the one-way electromagnetic valve (16) are in a normally closed state;
s2: whether people need to pass through the fire door for evacuation is judged through the personnel identification module, and if not, the electromagnet (11) and the one-way electromagnetic valve (16) are kept in a normally closed state continuously; if yes, go to step S3;
s3: the personnel signals are transmitted to a control system, and the control system controls the opening of a one-way electromagnetic valve (16) and the electrification of an electromagnet (11) to adsorb the steel plate (4);
s4: after the one-way electromagnetic valve (16) is opened and the electromagnet (11) is electrified for 4-6S, the control system controls the one-way electromagnetic valve (16) to be closed and the electromagnet (11) to be powered off;
s5: the return spring (10) drives the piston (9) to move left under the action of elastic potential energy and drives the gear shaft (12) to rotate so as to automatically close the door leaf (2).
CN202210102929.XA 2022-01-27 2022-01-27 Fireproof door suitable for evacuation of mobility impaired people and use method thereof Active CN114412313B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210102929.XA CN114412313B (en) 2022-01-27 2022-01-27 Fireproof door suitable for evacuation of mobility impaired people and use method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210102929.XA CN114412313B (en) 2022-01-27 2022-01-27 Fireproof door suitable for evacuation of mobility impaired people and use method thereof

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CN114412313A true CN114412313A (en) 2022-04-29
CN114412313B CN114412313B (en) 2023-04-25

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2273680A1 (en) * 1998-08-01 2000-02-01 Jong Bok Jang Hydraulic automatic-shock-absorbing hinge device
CN2361797Y (en) * 1999-03-12 2000-02-02 庄凤龄 Full-automatic door closer for fire-proof door
CN108457559A (en) * 2018-05-16 2018-08-28 乐辉 A kind of intelligent door closer based on human-body infrared sensing and fire-fighting link
CN209539073U (en) * 2018-12-19 2019-10-25 陕西恒伟特种门窗有限公司 A kind of normally closed type fire resistant doorsets being automatically closed

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2273680A1 (en) * 1998-08-01 2000-02-01 Jong Bok Jang Hydraulic automatic-shock-absorbing hinge device
CN2361797Y (en) * 1999-03-12 2000-02-02 庄凤龄 Full-automatic door closer for fire-proof door
CN108457559A (en) * 2018-05-16 2018-08-28 乐辉 A kind of intelligent door closer based on human-body infrared sensing and fire-fighting link
CN209539073U (en) * 2018-12-19 2019-10-25 陕西恒伟特种门窗有限公司 A kind of normally closed type fire resistant doorsets being automatically closed

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