Powerful sealing type fireproof door

Abstract

The utility model discloses a powerful sealing type fireproof door. The powerful sealing type fireproof door comprises a door frame, a door leaf and a linkage assembly provided with an expansion material. The linkage assembly carries the expansion material to be installed in the door frame and / or the door leaf and is in driving fit with the door leaf. When the door leaf is closed, the expansion material is filled in a gap between the door frame and the door leaf under the driving of the linkage assembly; when the door leaf is opened, the expansion material is driven by the linkage assembly to retract into the door frame and / or the door leaf. The fireproof door has the beneficial effects that compared with an existing fireproof door, the linkage assembly is arranged in the door frame, the expansion material is arranged on the linkage assembly, and through rotation of the door leaf, the linkage assembly drives the expansion material to move in the gap between the door frame and the door leaf; a fire area and a safety area are effectively isolated, and the fireproof door is safely and rapidly opened, so that the safety of personnel is guaranteed, and time is won for rescue.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of doors, in particular to a strong sealing type fire door. BACKGROUND

[0002] The main role of the fire door is to meet the requirements of fire resistance stability, integrity and heat insulation within a certain time, which is used for fire separation. They are usually arranged in fire compartment partition walls, evacuation staircases, vertical shafts and other positions, which help to prevent the spread of fire and smoke diffusion, and provide opportunities for personnel to escape in case of fire.

[0003] The existing fire door has the following problems when in use:

[0004] (1) When the normal fire door is burned in the fire area for a long time, the door frame and the door leaf are prone to deformation, which causes the gap between the door leaf and the door frame to become larger, and the open flame may spread to the safe area from the gap.

[0005] (2) The traditional fire door frame and the door gap are installed with expansion material to isolate the fire, but the traditional expansion material is fixedly installed, which may cause the door leaf to be unable to open due to the expansion of the expansion material when the fire is large.

[0006] Therefore, it is necessary to reform the existing fire door. CONTENT OF THE INVENTION

[0007] The purpose of the present application is to provide a fire door that can solve at least one of the defects in the background art.

[0008] In order to achieve the above at least one purpose, the technical scheme adopted by the present application is: a strong sealing type fire door, comprising a door frame, a door leaf and a linkage assembly provided with expansion material; the linkage assembly carrying the expansion material is installed in the door frame and / or the door leaf, and is driven in cooperation with the door leaf; when the door leaf is closed, the expansion material is filled in the gap between the door frame and the door leaf under the driving of the linkage assembly; when the door leaf is opened, the expansion material is withdrawn into the door frame and / or the door leaf under the driving of the linkage assembly.

[0009] Preferably, the door frame is provided with a mounting cavity, and the linkage assembly carrying the expansion material is installed in the mounting cavity; the driving end of the linkage assembly is connected with the door leaf or a door closer installed between the door leaf and the door frame; when the door leaf is opened or closed, the linkage assembly drives the expansion material to move in position under the driving of the door leaf or the change in position of the door closer.

[0010] Preferably, the linkage assembly comprises a first moving part, a second moving part and a third moving part, and each is provided with the expansion material; the first moving part, the second moving part and the third moving part are respectively installed at the top, the side and the bottom of the installation cavity; the driving end of the first moving part is connected through the installation cavity and the door closer, and under the position change of the door closer, the first moving part drives the expansion material carried thereby to move in position; the driving end of the second moving part is wedge-shaped matched with the side of the first moving part, and the second moving part carries the expansion material to move in position under the driving of the first moving part; the driving end of the third moving part is connected with the bottom of the second moving part, and under the position movement of the second moving part, the third moving part drives the expansion material carried thereby to move in position.

[0011] Preferably, the driving end of the linkage assembly is connected with the door closer; the first moving part comprises a first rack, a first rotating member and a first connecting member provided with the expansion material at the bottom; the driving end of the first rack is connected with the door closer, and the other end away from the driving end is gear matched with the bottom end of the first rotating member; through the rotation of the door leaf, the position of the door closer is changed, thereby driving the first rack to move in position and driving the first rotating member to rotate; the first rotating member is provided with a first installation cavity, the top of the first connecting member is provided with a first guide rod, the first connecting member is hingedly connected with the rotating groove provided at the side of the first rotating member through the pin shaft provided at the side of the first guide rod, and the first guide rod is partially located in the first installation cavity; through the rotation of the first rotating member, the pin shaft is matched with the rotating groove, so that the first connecting member drives the expansion material to move in position and is wedge-shaped matched with the second moving part.

[0012] Preferably, the second moving part comprises a cross bar, a bearing, an elastic member and a second connecting member provided with the expansion material at the bottom; the first connecting member is provided with a wedge-shaped block at the side close to the second moving part; the cross bar is elastically installed at the side of the installation cavity through the elastic member; the cross bar and the second connecting member are fixedly connected, the bearing is rotatably installed at the side of the cross bar and abuts against the wedge-shaped block; through the movement of the wedge-shaped block driven by the first connecting member, the bearing is wedge-shaped matched with the wedge-shaped block, thereby the cross bar drives the second connecting member to move in position and simultaneously drives the third moving part to move in position.

[0013] Preferably, the third moving part comprises a second rack, a second rotating part and a third connecting part with the expanded material mounted on the bottom; the driving end of the second rack is fixedly connected with the cross rod, and the other end away from the driving end is gear matched with the bottom end of the second rotating part; the second rack is driven to move through the displacement of the cross rod, so as to drive the second rotating part to rotate; the second rotating part is provided with a second accommodating cavity, the top of the third connecting part is provided with a second guide rod, the third connecting part is hingedly connected with the rotating groove arranged on the side of the second rotating part through the pin shaft arranged on the side of the second guide rod, and the second guide rod is partially arranged in the second accommodating cavity; the third connecting part drives the expanded material to move in position through the matching of the pin shaft and the rotating groove.

[0014] Preferably, the door leaf has a pair of door leaves, and the linkage assembly has a pair of linkage assemblies; the door leaves are symmetrically installed, and the linkage assemblies are symmetrically installed along the midline of the door frame width direction in the installation cavity.

[0015] Preferably, the door frame is provided with an opening groove, and the driving end of the first rack is connected with the door closer by extending out of the opening groove.

[0016] Preferably, the top of the installation cavity is provided with a sliding groove at the position corresponding to the cross rod, and the cross rod is provided with bearings at both ends; the bearings slide in the sliding groove.

[0017] Preferably, the first rotating part and the second rotating part are rotatably installed in the installation cavity.

[0018] Compared with the prior art, the beneficial effects of the present application are that:

[0019] Compared with the existing fireproof door, the linkage assembly is arranged in the door frame, the expanded material is arranged on the linkage assembly, the expanded material is driven to move in the gap between the door frame and the door leaf through the rotation of the door leaf, the fire area and the safe area are effectively isolated, the fireproof door is quickly opened, the personnel safety is guaranteed, and more time is obtained for rescue. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is a partial enlarged schematic view of A in the utility model.

[0022] Figure 3 It is a schematic diagram of the first moving part in the exploded state of the utility model.

[0023] Figure 4 It is the cross section structure schematic view of the first moving part in the utility model.

[0024] Figure 5 It is the connection schematic view of the door closer and the first moving part in the utility model.

[0025] Figure 6 It is the structure schematic view of the second moving part in the utility model.

[0026] Figure 7 It is the state schematic view of the second moving part and the first moving part wedge cooperation in the utility model.

[0027] Figure 8 It is the cross section structure schematic view of the third moving part in the utility model.

[0028] Figure 9 It is the state schematic view of the first moving part and the second moving part when moving in the utility model.

[0029] Figure 10 It is the state schematic view of the third moving part when moving in the utility model.

[0030] In the drawing: door frame 1, installation cavity 10, sliding groove 100, opening slot 11, linkage assembly 2, first moving part 20, first fixed part 201, first rotating cavity 2010, first rotating part 202, first installation cavity 2020, rotating slot 2021, first connecting part 203, first guide rod 204, pin shaft 2040, wedge block 205, first rack 206, second moving part 21, second connecting part 210, cross rod 211, bearing 212, elastic part 213, third moving part 22, second rotating part 220, second rack 221, third connecting part 222, door leaf 3, expansion material 4, door closer 5. DETAILED DESCRIPTION

[0031] In the following, the application is further described in conjunction with specific embodiments, and it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0032] In the description of the present application, it should be noted that for the orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0033] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily have to describe a specific order or chronological order.

[0034] The terms "include" and "have" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or apparatus that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or apparatus.

[0035] One preferred embodiment of the present application, as shown in Figures 1 to 10 A strong sealing type fire door, including a door frame 1, a door leaf 3, and a linkage assembly 2 installed with an expansion material 4. The linkage assembly 2 carries the expansion material 4 installed in the door frame 1 and / or the door leaf 3, and cooperates with the door leaf 3 for driving. When the door leaf 3 is closed, the expansion material 4 is filled in the gap between the door frame 1 and the door leaf 3 under the driving of the linkage assembly 2; when the door leaf 3 is opened, the expansion material 4 is withdrawn into the door frame 1 and / or the door leaf 3 under the driving of the linkage assembly 2.

[0036] It should be understood that when the conventional fire door burns for a long time in the fire area, the door frame 1 and the door leaf 3 are prone to deformation, resulting in an increase in the gap between the door leaf 3 and the door frame 1, and the open fire may spread from the gap to the safe area. Although the conventional fire door frame 1 and the door leaf 3 are installed with an expansion material 4 to isolate the fire, the conventional expansion material 4 is fixedly installed on the door frame 1 and / or the door leaf 3, and when the fire is large, the expansion of the expansion material 4 may cause the door leaf 3 to be unable to open.

[0037] Therefore, in the embodiment, the problems of the existing fireproof door are solved by arranging the linkage assembly 2 provided with the expansion material 4 in the door frame 1. In the embodiment, the linkage assembly 2 is connected with the door leaf 3, and the expansion material 4 is driven to move in the gap between the door frame 1 and the door leaf 3 by the linkage assembly 2 when the door leaf 3 is rotated, so as to effectively isolate the fire area and the safe area and quickly and safely open the door leaf 3, thereby ensuring the safety of personnel and gaining more time for rescue.

[0038] In the embodiment, the linkage assembly 2 is connected with the door leaf 3, and the expansion material 4 is driven to move in the gap between the door frame 1 and the door leaf 3 by the linkage assembly 2 when the door leaf 3 is rotated, so as to effectively isolate the fire area and the safe area and quickly and safely open the door leaf 3, thereby ensuring the safety of personnel and gaining more time for rescue.

[0039] Option one: the linkage assembly 2 is arranged in the door leaf 3 and the door frame 1.

[0040] Option two: the linkage assembly 2 is arranged in the door leaf 3.

[0041] Option three: the linkage assembly 2 is arranged in the door frame 1.

[0042] It should be understood that the above three arrangement modes can meet the requirements of the present application, and a person skilled in the art can select them according to actual needs; in the embodiment, the above option three is preferably adopted.

[0043] It can be understood that the above option one or option two or option three can meet the requirements of the present application, but when the linkage assembly 2 is arranged in the door leaf 3 and the door frame 1, the structure of the installation is too complicated. As known, the fireproof door needs to be frequently detected in daily life to ensure that the fireproof door can normally work without problems. However, when the linkage assembly 2 is arranged in the door leaf 3 and the door frame 1, the complexity of the structure makes it inconvenient for the detection personnel to detect, and the complicated installation and disassembly process also makes the detection process complicated.

[0044] It can also be understood that the normal fireproof door is provided with fireproof materials such as pearl wool, rock wool, asbestos and polyurethane foam in the door leaf 3, and the filling of the fireproof materials is also necessary for the fireproof door. However, most of the door frame 1 is hidden in the wall when the fireproof door is normally installed, which can effectively prevent fire. Therefore, it is unnecessary to sacrifice the position of the fireproof materials in the door leaf 3 for installing the linkage assembly 2. If the linkage assembly 2 is arranged in the door leaf 3, the expansion material 4 can also be filled in the gap between the door leaf 3 and the door frame 1, but it also increases certain safety hazards.

[0045] Therefore, in the embodiment, the linkage assembly 2 is installed in the door frame 1. The linkage assembly 2 is installed in the door frame 1 and connected with the door leaf 3. When the door leaf 3 rotates, the linkage assembly 2 is driven to move by the connection between the door leaf 3 and the linkage assembly 2, so that the expanding material 4 moves.

[0046] In the embodiment, the linkage assembly is installed in the door frame, so as shown in Figure 9 、 10 , an installation cavity 10 is arranged in the door frame 1 for facilitating the installation of the linkage assembly 2. The linkage assembly 2 is installed in the installation cavity 10.

[0047] It can be understood that, in order to enable people to evacuate quickly and effectively in case of fire, a fire door is usually selected to be a double-leaf door. Therefore, the linkage assembly 2 is symmetrically arranged along the center line of the door leaf 3 in the width direction of the door leaf 3 in the installation cavity 10.

[0048] It can also be understood that, in the embodiment, the linkage assembly 2 is driven to move by the connection between the door leaf 3 and the linkage assembly 2 when the door leaf 3 rotates. Therefore, there are various specific connection modes between the door leaf 3 and the linkage assembly 2, including but not limited to the following two modes.

[0049] Mode one: the driving end of the linkage assembly 2 is directly connected with the door leaf 3.

[0050] Mode two: as shown in Figure 2 , the driving end of the linkage assembly 2 is connected with a door closer 5 installed between the door leaf 3 and the door frame 1.

[0051] It should be understood that the above three arrangement modes can meet the requirements of the present application, and a person skilled in the art can select according to actual needs. In the embodiment, the mode two is preferably adopted.

[0052] It can be understood that, in the embodiment, the driving end of the linkage assembly 2 is directly connected with the door leaf 3 or the driving end of the linkage assembly 2 is connected with the door closer 5 installed between the door leaf 3 and the door frame 1. Both the two connection modes can meet the requirements of the present application. However, it should be understood that, if the driving end of the linkage assembly 2 is directly connected with the door leaf 3, additional structures are needed for connection. Otherwise, the connection structure between the two is relatively weak and may not be able to stably function in case of fire. Generally, a door closer 5 is installed between the door frame 1 and the door leaf 3 during installation of the fire door. The working principle of the door closer 5 is known to a person skilled in the art. If the driving end of the linkage assembly 2 is directly connected with the door closer 5, the linkage assembly 2 can stably work in case of fire by virtue of the stable structure and rotatable working principle of the door closer 5.

[0053] Therefore, in the embodiment, as shown in Figure 2 Meanwhile, in order to facilitate the connection between the linkage assembly 2 and the door closer 5, an opening slot 11 is arranged on the door frame 1, and the driving end of the linkage assembly 2 extends out of the opening slot 11 to be connected with the door closer 5. When the door leaf 3 rotates, the door closer 5 is driven to rotate, and the driving end of the linkage assembly 2 is driven to move by the door closer 5, so that the entire linkage assembly 2 moves.

[0054] In the embodiment, the linkage assembly 2 is installed in the installation cavity 10, and the expansion material 4 is installed on the linkage assembly 2. When the door leaf 3 is opened, the linkage assembly 2 drives the expansion material 4 to retract, so as to facilitate the opening of the door leaf 3 and not to hinder. When the door leaf 3 is closed, the linkage assembly 2 drives the expansion material 4 to fill in the gap between the door frame 1 and the door leaf 3 and abut against the side of the door leaf 3.

[0055] It can be understood that the side of the single-leaf door is four sides, but the side of the double-leaf door is three sides. In order to effectively block the fire area and the safety area, the linkage assembly 2 is divided into three parts. Therefore, as shown in Figure 9 、 10 The linkage assembly 2 includes a first moving part 20, a second moving part 21 and a third moving part 22, and the expansion material 4 is arranged on the first moving part 20, the second moving part 21 and the third moving part 22. The first moving part 20, the second moving part 21 and the third moving part 22 are respectively installed on the top, the side and the bottom of the installation cavity 10, so as to fill the gap between the top, the side and the bottom of the door leaf 3 and the door frame 1, and fully isolate the fire area and the safety area.

[0056] It can also be understood that the driving end of the first moving part 20 penetrates through the opening slot 11 and the door closer 5 to be connected, and when the door leaf 3 rotates to cause the position of the door closer 5 to change, the first moving part 20 drives the expansion material 4 carried thereby to move. The driving end of the second moving part 21 is wedge-shaped matched with the side of the first moving part 20, and the second moving part 21 moves under the driving of the first moving part 20 to carry the expansion material 4 to move. The driving end of the third moving part 22 is connected with the bottom of the second moving part 21, and when the second moving part 21 moves, the third moving part 22 drives the expansion material 4 carried thereby to move.

[0057] In the embodiment, as shown in Figure 3 、 4As shown in FIG. 5, the first moving part 20 comprises a first rack 206, a first rotating part 202, and a first connecting part 203 with the expanded material 4 mounted on the bottom. The driving end of the first rack 206 is connected with the door closer 5, and the other end away from the driving end of the first rack 206 is in gear cooperation with the bottom end of the first rotating part 202. The door closer 5 is changed in position by rotating the door leaf 3, and then the first rack 206 is driven to move in position, and the first rotating part 202 is driven to rotate. The first rotating part 202 is provided with a first installation cavity 2020, the first connecting part 203 is provided with a first guide rod 204 on the top, the first connecting part 203 is connected with the rotating groove 2021 on the side of the first rotating part 202 through the pin shaft 2040 on the side of the first guide rod 204, and the first guide rod 204 is partially located in the first installation cavity 2020. The pin shaft 2040 is cooperated with the rotating groove 2021 by rotating the first rotating part 202, so that the first connecting part 203 drives the expanded material 4 to move, and is simultaneously cooperated with the second moving part 21 in wedge shape.

[0058] It should be known that the principle of the above function is that the first connecting part 203 is provided with the expanded material 4 on the bottom, and the expanded material 4 is abutted with the door leaf 3. When the door leaf 3 is opened, the driving end of the first rack 206 is moved by the door closer 5, the first rotating part 202 is driven to rotate, the first connecting part 203 is driven to move upward, the expanded material 4 is retracted, the abutment with the door leaf 3 is released, and then the door leaf 3 can be safely and quickly opened, and vice versa.

[0059] It can be understood that there are many structures for moving the first connecting part 203 up and down, such as axial cam, but in the embodiment, the first rotating part 202 and the first rack 206 are preferably used.

[0060] It can also be understood that in order to make the first rotating part 202 better rotate in the installation cavity 10, the first fixing part 201 is provided in the installation cavity 10, and the first rotating cavity 2010 is provided on the first fixing part 201. The first rotating part 202 is rotatably connected with the first fixing part 201 in the first rotating cavity 2010, and is convenient for rotating in the installation cavity 10.

[0061] In the embodiment, as shown in FIG. 5, Figure 6 、 7As shown in FIG. 8, the second moving part 21 comprises a crossbar 211, a bearing 212, an elastic member 213, and a second connecting piece 210 with the expanded material 4 mounted at the bottom. The first connecting piece 210 is provided with a wedge block 205 near the side of the second moving part 21, and the crossbar 211 is elastically mounted to the side of the mounting cavity 10 through the elastic member 213. The crossbar 211 and the second connecting piece 210 are fixedly connected, the bearing 212 is rotatably mounted to the side of the crossbar 211 and abuts against the wedge block 205. The wedge block 205 is moved by the first connecting piece 203, so that the bearing 212 is wedge-shaped matched with the wedge block 205, and then the crossbar 211 drives the second connecting piece 210 to move in position, and simultaneously drives the third moving part 22 to move in position. The driving principle of the third moving part 22 is the same as that of the first moving part 20. Specifically, the third moving part 22 comprises a second rack 221, a second rotating piece 220, and a third connecting piece 222 with the expanded material 4 mounted at the bottom. The driving end of the second rack 221 is fixedly connected with the crossbar 211, and the other end away from the driving end of the second rack 221 is gear matched with the bottom end of the second rotating piece 220. The second rack 221 is moved by the crossbar 211, so that the second rotating piece 220 is rotated. The third connecting piece 222 is connected through the same connection principle of the first moving part 20, and is connected through the pin shaft 2040 and the rotating groove 2021, so that the second rotating piece 220 drives the third connecting piece 222 to move, and then the expanded material 4 moves in position.

[0062] It can be understood that, in order to facilitate the movement of the crossbar 211 in the mounting cavity 10, Figure 9 、 10 As shown in FIG. 10, the top of the mounting cavity 10 is provided with a sliding groove 100 corresponding to the crossbar 211, and the both ends of the crossbar 211 are provided with the bearing 212 which slides in the sliding groove 100.

[0063] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A strong sealing type fire door, characterized in that, The application relates to a door frame, a door leaf and a linkage assembly with an expansion material, wherein the linkage assembly with the expansion material is installed in the door frame and / or the door leaf and is driven by the door leaf. When the door leaf is closed, the expansion material is filled in the gap between the door frame and the door leaf under the driving of the linkage assembly; when the door leaf is opened, the expansion material is withdrawn into the door frame and / or the door leaf under the driving of the linkage assembly. The door frame is provided with an installation cavity, the linkage assembly with the expansion material is installed in the installation cavity, the driving end of the linkage assembly is connected with the door leaf or a door closer installed between the door leaf and the door frame, and the linkage assembly drives the expansion material to move under the driving of the door leaf or the position change of the door closer when the door leaf is opened or closed.

2. A high security, self-sealing fire door as claimed in claim 1 wherein: The linkage assembly comprises a first moving part, a second moving part and a third moving part, and the three moving parts are all installed with the expansion material; the first moving part, the second moving part and the third moving part are respectively installed at the top, the side and the bottom of the installation cavity; the driving end of the first moving part is connected with the door closer through the installation cavity, and the first moving part drives the expansion material to move under the position change of the door closer; the driving end of the second moving part is wedge-shapedly connected with the side of the first moving part, and the second moving part drives the expansion material to move under the driving of the first moving part; the driving end of the third moving part is connected with the bottom of the second moving part, and the third moving part drives the expansion material to move under the position change of the second moving part.

3. A high security, self-sealing fire door as claimed in claim 2, wherein: The driving end of the linkage assembly is connected with the door closer; the first moving part comprises a first rack, a first rotating part and a first connecting part with the expansion material installed at the bottom; the driving end of the first rack is connected with the door closer, and the other end far away from the driving end is gear-connected with the bottom end of the first rotating part; the door closer is changed in position through the rotation of the door leaf, so that the first rack is driven to move in position and the first rotating part is driven to rotate; the first rotating part is provided with a first installation cavity, the top of the first connecting part is provided with a first guide rod, the first connecting part is connected with the rotating groove of the side of the first rotating part through the pin shaft arranged at the side of the first guide rod, and the first guide rod is partially arranged in the first installation cavity; the pin shaft is connected with the rotating groove through the rotation of the first rotating part, so that the first connecting part drives the expansion material to move in position and is wedge-shapedly connected with the second moving part.

4. A high security, self-sealing fire door as claimed in claim 3 wherein: ​ 5. A high security, self-sealing fire door as claimed in claim 4, wherein: The second moving part comprises a crossbar, a bearing, an elastic member, and a second connecting piece with the expanded material mounted at the bottom; the first connecting piece is provided with a wedge block at the side close to the second moving part; the crossbar is elastically mounted to the side of the mounting cavity through the elastic member; the crossbar and the second connecting piece are fixedly connected, and the bearing is rotatably mounted to the side of the crossbar and abuts against the wedge block; the wedge block is moved by the first connecting piece, so that the bearing is wedge-shaped matched with the wedge block, and then the crossbar drives the second connecting piece to move in position, and simultaneously drives the third moving part to move in position.

6. A high security, self-sealing fire door as claimed in claim 5 wherein: The third moving part comprises a second rack, a second rotating piece, and a third connecting piece with the expanded material mounted at the bottom; the driving end of the second rack is fixedly connected with the crossbar, and the other end away from the driving end is gear-matched with the bottom end of the second rotating piece; the crossbar is displaced, so as to drive the second rack to move, and then the second rotating piece is rotated; the second rotating piece is provided with a second accommodating cavity, the third connecting piece is provided with a second guide rod at the top, the third connecting piece is hingedly connected with the second rotating piece through the pin shaft provided at the side of the second guide rod and the rotating groove provided at the side of the second rotating piece, and the second guide rod is partially located in the second accommodating cavity; the pin shaft is matched with the rotating groove through the rotation of the second rotating piece, so that the third connecting piece drives the expanded material to move in position.

7. A high security, self-sealing fire door as claimed in claim 2, wherein: The door leaves are a pair, and the linkage assemblies are a pair; the door leaves are symmetrically installed, and the linkage assemblies are symmetrically installed along the midline of the door frame width direction in the mounting cavity.

8. A high security, self-sealing fire door as claimed in claim 4, wherein: The door frame is provided with an opening groove, and the driving end of the first rack is connected with the door closer by extending out of the opening groove.

9. A high security, self-sealing fire door as claimed in claim 5, wherein: The top of the mounting cavity is provided with a sliding groove at the position corresponding to the crossbar, and the crossbar is provided with bearings at both ends; the bearings slide in the sliding groove.

10. A high security, self-sealing fire door as claimed in claim 6, wherein: The first rotating piece and the second rotating piece are rotatably mounted in the mounting cavity.

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