Mounting structure of fire exit door

Abstract

The utility model belongs to the technical field of fire exit doors, and particularly relates to a mounting structure of a fire exit door. A door plate; the mounting assembly comprises a first hinge piece connected with the door frame, a second hinge piece connected with the door plate and a hinge shaft connected with the two hinges; the hidden structure comprises a hidden frame arranged on the door plate, a hidden groove formed in the door frame and a limiting groove formed in the door frame and used for allowing the second hinge piece to rotate; the end, away from the door plate, of the hidden frame extends out of the hinge shaft, and the end, away from the second hinge piece, of the first hinge piece extends into the hidden groove. The hidden structure has the beneficial effects that the hidden frame extends out of the hinge shaft, and the first hinge piece is embedded into the hidden groove, so that the hinge main body is wrapped by the hidden structure of the door frame and the door plate, the direct corrosion of the external humid and dusty environment to the hinge is remarkably reduced, the rusting and jamming risks of the hinge are reduced, and the normal opening and closing function of the fire exit door in a fire disaster is guaranteed.

Description

Technical Field

[0001] This application belongs to the field of fire door technology, and particularly relates to an installation structure for a fire door. Background Technology

[0002] In the field of fire safety, fire doors, as important fire-resistant partitions in buildings, directly affect the effectiveness of personnel evacuation and fire control during a fire due to the rationality and reliability of their installation structure. Currently, in existing fire door installation structures, hinges are typically installed in an exposed manner, meaning the main body of the hinge is directly exposed in the outer space between the fire door and the door frame. This exposed hinge installation structure has many negative impacts.

[0003] Exposed hinges are susceptible to environmental factors such as humidity and dust, which can cause them to rust and jam, affecting the normal opening and closing of fire doors. In emergency fire situations, hinge malfunctions may prevent the doors from fulfilling their fire-resistant separation function. Furthermore, exposed hinges are vulnerable to external damage, making them susceptible to malicious acts and reducing the overall protective performance of fire doors, thus requiring improvement. Utility Model Content

[0004] The purpose of this application is to provide an installation structure for a fire door that can solve the above-mentioned problems.

[0005] The purpose of this application is to provide an installation structure for a fire door, comprising:

[0006] Door frame;

[0007] Door panel;

[0008] The mounting components include a first hinge component connected to the door frame, a second hinge component connected to the door panel, and a hinge shaft connecting the two hinges.

[0009] The concealed structure includes a concealed frame on the door panel, a concealed groove on the door frame, and a limiting groove on the door frame for the second hinge component to rotate.

[0010] Among them, the end of the hidden frame away from the door panel extends to the outside of the hinge axis, and the end of the first hinge component away from the second hinge component extends into the hidden groove.

[0011] The aforementioned fire door installation structure, through the coordinated design of the concealed structure and installation components, effectively solves many problems associated with exposed hinges in existing technologies. The structure, where the concealed frame extends beyond the hinge axis and the first hinge component is embedded in the concealed groove, allows the hinge body to be encased within the concealed structure of the door frame and door panel. This significantly reduces the direct corrosion of the hinge by external humid and dusty environments, lowers the risk of rust and jamming, and ensures the normal opening and closing function of the fire door during a fire. Simultaneously, it conceals and protects exposed weak points, preventing malicious damage and improving the overall reliability of the fire door. Furthermore, the design of the concealed frame and concealed groove allows the hinge to be completely or mostly hidden within the structural gap between the door frame and door panel, eliminating the abrupt impact of exposed hinges on the building's appearance and improving aesthetics.

[0012] Furthermore, compared to some existing concealed hinge solutions, this application achieves deep concealment of the hinge through a systematic design of concealed frame, concealed groove and limiting groove, while maintaining the simplicity and rotation flexibility of the installation components, and avoiding the installation difficulty and cost problems caused by complex structures.

[0013] Furthermore, the hidden frame is L-shaped and wraps around the hinge shaft, and the hidden frame is located in the limiting groove and can rotate within the limiting groove.

[0014] The concealed frame of this application adopts an L-shaped design and wraps around the hinge axis, and its rotation trajectory is constrained by the limiting groove, further enhancing the functionality of the concealed structure. The L-shaped wrapping shape can form a three-dimensional protective ring around the hinge axis. Compared with a planar shielding structure, it can more thoroughly isolate the direct corrosion of the core rotating components of the hinge from the external environment. Especially in harsh environments such as humid and dusty environments, it can effectively delay the problem of rotational obstruction caused by rust on the hinge axis, ensuring that the fire door remains smooth in opening and closing during long-term use.

[0015] Furthermore, the design of the hidden frame rotating within the limiting groove ensures that the hidden frame always moves along a preset trajectory when the door panel and door frame rotate relative to each other. This prevents gaps from widening due to shaking or misalignment, ensuring both the flexibility of hinge rotation and maintaining a tight fit between the door panel and door frame through the structural constraint of the limiting groove. This enhances structural stability while further reducing the possibility of smoke seeping through gaps in the hinge installation area during a fire. Combined with the L-shaped wrapping's shielding effect on the hinge axis, it creates a double barrier against high temperatures and smoke.

[0016] Furthermore, the limiting groove is rectangular and recessed towards the inside of the door frame, and the limiting groove is provided with a contact angle for limiting the rotation angle of the door panel.

[0017] In this application, the limiting groove adopts a rectangular inwardly recessed structural design, which matches the embedded shape of the first hinge component. While achieving deep concealment of the hinge, it further optimizes the stability of the installation structure. The rectangular recess provides sufficient embedding space for the first hinge component, so that the connection area between the hinge component and the door frame is completely hidden inside the door frame. Compared with traditional exposed or partially concealed structures, this allows the door frame surface to remain flat and continuous.

[0018] Meanwhile, the contact angle set on the limiting groove can effectively limit the rotation angle of the door panel, preventing the door panel from being over-opened, which would cause abnormal stress on the hinge assembly, or cause the gap between the door frame and the door panel to expand due to an excessive opening angle. This ensures that the fire door can be opened to a sufficient angle to meet the emergency evacuation needs of personnel, and also prevents the door panel from rotating excessively due to external impact or high temperature deformation through the physical limiting effect of the contact angle, thereby maintaining a tight fit between the door frame and the door panel and reducing the possibility of high temperature smoke penetrating through the installation gap.

[0019] Furthermore, the hidden slot is provided with:

[0020] Mounting base;

[0021] Screws;

[0022] The first hinge component is fixed to the mounting base by screws.

[0023] The mounting base and screws within the concealed groove form a stable connection foundation for the first hinge component, ensuring reliable hinge installation while further enhancing the concealed structure's effectiveness. As an intermediate connecting component, the mounting base provides a flat and evenly stressed fixing interface for the first hinge component, avoiding potential localized stress concentration or material damage caused by direct screw action on the door frame body. This is particularly suitable for door frames made of various materials such as metal and wood, improving the versatility and durability of the installation structure.

[0024] Meanwhile, by fixing the first hinge component to the mounting base with screws, a rigid connection between the hinge and the door frame is ensured. The recessed structure of the hidden groove completely conceals the screws and mounting base inside the door frame, fundamentally eliminating the impact of bolts, nuts and other connecting parts on the appearance in traditional exposed installations, and keeping the exterior of the door frame smooth and flat.

[0025] Furthermore, the second hinge component is mounted on the door panel by fasteners. The second hinge component is provided with a through hole for the fasteners to pass through, and a sealing cap for hiding the fasteners is also provided on the through hole.

[0026] The design of the second hinge component, which is fastened to the door panel and equipped with a sealing cap, further enhances the protection of the concealed structure and maintains aesthetic consistency. The sealing cap on the through-hole completely covers the fastener, keeping the door panel surface smooth and flat. Simultaneously, the sealing cap protects the fastener, effectively preventing corrosion of the connecting components by humid and dusty environments, reducing the risk of loosening due to fastener corrosion. During long-term use, even under frequent opening and closing or extreme environments, the connection between the second hinge component and the door panel remains stable, preventing abnormal opening and closing of the fire door due to component loosening, and effectively ensuring the reliability of personnel evacuation and fire containment during a fire. Furthermore, the fasteners here are screws, and the sealing cap is made of fire-resistant material.

[0027] Furthermore, the sealing cap includes:

[0028] The cover is ring-shaped, and its surface has a groove.

[0029] An extension protrusion is provided at the bottom of the cover, and a limiting protrusion is provided on the outward extension protrusion;

[0030] A clearance groove is provided on the through hole and is used to allow the limiting protrusion to pass through, and a limiting slot adapted to the extension protrusion is provided in the through hole;

[0031] The cover is inserted into the through hole, and by rotating the cover, the limiting protrusion can be engaged into the limiting slot.

[0032] The sealing cap's annular cover, combined with a slotted groove, extended protrusion, and limiting protrusion, significantly improves installation convenience and connection reliability while concealing the fasteners. The annular cover's shape matches the through-hole, and the slotted groove on its surface provides a leverage point for installation tools. By rotating the cover, the limiting protrusion can be engaged with the limiting slot within the through-hole, requiring no additional tools or complex operations. This ensures the sealing cap is flush with the door panel surface and facilitates disassembly and replacement for later maintenance, balancing practicality and convenience.

[0033] The design of the extended protrusion and the limiting protrusion creates a mechanical locking structure between the sealing cap and the through hole: after the extended protrusion is inserted into the through hole, rotating the cap causes the limiting protrusion to engage with the corresponding limiting groove in the clearance groove. This effectively prevents the sealing cap from falling off due to vibration or external force, ensuring long-term protection of the fasteners. It avoids the easy detachment problem of traditional adhesive or simple snap-fit ​​sealing caps. Even when fire doors are frequently opened and closed or subjected to impacts, the sealing cap remains firmly attached, effectively preventing the risk of corrosion of the connectors due to moisture, dust, and other factors.

[0034] Furthermore, the door frame is also provided with a sealing element that contacts the door panel, for sealing when the door panel is closed.

[0035] The sealing element installed on the door frame forms a tight fit with the door panel when closed, further enhancing the fire-resistant sealing performance and environmental adaptability of the fire door. The sealing element is strip-shaped and made of fire-resistant material. When the door panel is closed, the sealing element fills the gap between the door frame and the door panel. Together with the concealed frame and concealed groove structure, it physically blocks the penetration of high-temperature smoke, flames, and dust, improving the fire-resistant separation and sealing effect of the fire door in a fire.

[0036] The beneficial effects of this application are:

[0037] 1. The structure of the hidden frame extending to the outside of the hinge axis and the first hinge component being embedded in the hidden groove makes the hinge body wrapped by the hidden structure of the door frame and door panel, which significantly reduces the direct corrosion of the hinge by the external humid and dusty environment, reduces the risk of hinge rust and jamming, and ensures the normal opening and closing function of the fire door in case of fire.

[0038] 2. By concealing the structure, exposed weak points can be hidden and protected, preventing malicious damage and improving the overall reliability of fire doors. It also eliminates the abrupt impact of exposed hinges on the building's appearance, thus improving aesthetics.

[0039] 3. Compared with some existing hidden hinge solutions, this application achieves deep concealment of the hinge through a systematic design of hidden frame, hidden groove and limiting groove, while maintaining the simplicity of the installation components and the flexibility of rotation, avoiding the installation difficulty and cost problems caused by complex structure. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of this utility model in the closed state;

[0041] Figure 2 This is a schematic diagram of the structure of this utility model in its open state;

[0042] Figure 3 yes Figure 1 Enlarged view of A in the middle;

[0043] Figure 4 yes Figure 2 Enlarged image in the image;

[0044] Figure 5 This is a schematic diagram of the installation of the sealing cap of this utility model.

[0045] The reference numerals in the figure are as follows: 100, door frame; 200, door panel; 300, mounting assembly; 310, first hinge component; 320, second hinge component; 321, through hole; 322, fastener; 330, hinge shaft; 400, hidden structure; 410, hidden frame; 420, hidden groove; 421, contact angle; 422, mounting base; 423, screw; 430, limiting groove; 500, sealing cover; 510, cover body; 511, slotted groove; 520, extension protrusion; 521, limiting protrusion; 530, clearance groove; 531, limiting slot; 600, seal. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0047] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0048] The installation structure of the fire door provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0049] Example 1:

[0050] like Figures 1 to 4 As shown in the figure, this application embodiment provides an installation structure for a fire door, including:

[0051] Door frame 100;

[0052] Door panel 200;

[0053] Mounting assembly 300 includes a first hinge component 310 connected to the door frame 100, a second hinge component 320 connected to the door panel 200, and a hinge shaft 330 connecting the two hinges.

[0054] The concealed structure 400 includes a concealed frame 410 disposed on the door panel 200, a concealed groove 420 disposed on the door frame 100, and a limiting groove 430 disposed on the door frame 100 for the second hinge member 320 to rotate.

[0055] Among them, the end of the hidden frame 410 away from the door panel 200 extends to the outside of the hinge axis 330, and the end of the first hinge member 310 away from the second hinge member 320 extends into the hidden groove 420.

[0056] In some embodiments of this application, such as Figure 1 As shown, the fire door installation structure described above, through the coordinated design of the concealed structure 400 and the installation component 300, effectively solves many problems associated with exposed hinges in the prior art. The structure of the concealed frame 410 extending beyond the hinge shaft 330 and the first hinge component 310 embedded in the concealed groove 420 allows the hinge body to be enclosed by the concealed structure 400 of the door frame 100 and the door panel 200. This significantly reduces the direct corrosion of the hinge by external humid and dusty environments, lowers the risk of hinge rust and jamming, and ensures the normal opening and closing function of the fire door during a fire. Simultaneously, it conceals and protects exposed weak points, preventing malicious damage and improving the overall reliability of the fire door. Furthermore, the design of the concealed frame 410 and the concealed groove 420 allows the hinge to be completely or mostly hidden in the structural gap between the door frame 100 and the door panel 200, eliminating the abrupt impact of exposed hinges on the building's appearance and improving aesthetics.

[0057] Furthermore, compared to some existing concealed hinge solutions, this application achieves deep concealment of the hinge through the systematic design of the concealed frame 410, concealed groove 420 and limiting groove 430, while maintaining the simplicity and rotation flexibility of the mounting component 300, and avoiding the installation difficulty and cost problems caused by complex structures.

[0058] Example 2:

[0059] This application provides an installation structure for a fire door. In addition to the above-mentioned technical features, the installation structure for the fire door in this application also includes the following technical features.

[0060] like Figure 3 and Figure 4 As shown, the hidden frame 410 is L-shaped and wraps around the hinge shaft 330, and the hidden frame 410 is located in the limiting groove 430 and can rotate within the limiting groove 430.

[0061] In this embodiment, the hidden frame 410 adopts an L-shaped design and wraps around the hinge shaft 330, and its rotation trajectory is constrained by the limiting groove 430, further enhancing the functionality of the hidden structure 400. The L-shaped wrapping shape can form a three-dimensional protective ring around the hinge shaft 330. Compared with a planar shielding structure, it can more thoroughly isolate the direct corrosion of the hinge core rotating components by the external environment. Especially in harsh environments such as humid and dusty environments, it can effectively delay the rotational obstruction problem of the hinge shaft 330 caused by corrosion, ensuring that the fire door remains smooth in opening and closing during long-term use.

[0062] Furthermore, the design of the hidden frame 410 rotating within the limiting groove 430 ensures that the hidden frame 410 always moves along a preset trajectory when the door panel 200 and the door frame 100 rotate relative to each other. This prevents the gap from widening due to shaking or misalignment, ensuring both the flexibility of the hinge rotation and maintaining a tight fit between the door panel 200 and the door frame 100 through the structural constraint of the limiting groove 430. This enhances structural stability and further reduces the possibility of smoke seeping through the hinge installation area gaps during a fire. Combined with the L-shaped wrapping's shielding effect on the hinge shaft 330, it creates a double barrier against high temperatures and smoke.

[0063] Example 3:

[0064] This application provides an installation structure for a fire door. In addition to the above-mentioned technical features, the installation structure for the fire door in this application also includes the following technical features.

[0065] like Figure 3 and Figure 4 As shown, the limiting groove 430 is rectangular and recessed into the inner door frame 100, and the limiting groove 430 is provided with a contact angle 421 for limiting the rotation angle of the door panel 200.

[0066] In this embodiment, the limiting groove 430 adopts a rectangular inwardly recessed structure design, which matches the embedded shape of the first hinge member 310. While achieving deep concealment of the hinge, it further optimizes the stability of the installation structure. The rectangular recess provides sufficient embedding space for the first hinge member 310, so that the connection area between the hinge member and the door frame 100 is completely hidden inside the door frame 100. Compared with traditional exposed or partially concealed structures, this allows the surface of the door frame 100 to remain flat and continuous.

[0067] Meanwhile, the contact angle 421 provided on the limiting groove 430 can effectively limit the rotation angle of the door panel 200, preventing the door panel 200 from opening excessively, causing abnormal stress on the hinge assembly, or causing the gap between the door frame 100 and the door panel 200 to expand due to an excessive opening angle. This ensures that the fire door can open to a sufficient angle to meet the emergency evacuation needs of personnel, and through the physical limiting effect of the contact angle 421, it prevents the door panel 200 from rotating excessively due to external impact or high temperature deformation, thereby maintaining a tight fit between the door frame 100 and the door panel 200 and reducing the possibility of high temperature smoke penetrating through the installation gap.

[0068] Furthermore, the hidden slot 420 is equipped with:

[0069] Mounting bracket 422;

[0070] Screw 423;

[0071] The first hinge component 310 is fixed to the mounting base 422 by screws 423.

[0072] The mounting base 422 and screw 423 within the concealed groove 420 form a stable connection base for the first hinge component 310, ensuring the reliability of hinge installation while further enhancing the effect of the concealed structure 400. As an intermediate connecting component, the mounting base 422 provides a flat and evenly stressed fixing interface for the first hinge component 310, avoiding potential localized stress concentration or material damage caused by the screw 423 directly acting on the door frame 100 body. This is particularly suitable for door frames 100 made of different materials such as metal and wood, improving the versatility and durability of the installation structure.

[0073] Meanwhile, the first hinge component 310 is fixed to the mounting base 422 by screws 423, which not only ensures the rigid connection between the hinge and the door frame 100, but also completely hides the screws 423 and the mounting base 422 inside the door frame 100 by means of the recessed structure of the hidden groove 420. This fundamentally eliminates the impact of bolts, nuts and other connecting parts on the appearance in traditional exposed installations, and keeps the exterior of the door frame 100 smooth and flat.

[0074] Example 4:

[0075] This application provides an installation structure for a fire door. In addition to the above-mentioned technical features, the installation structure for the fire door in this application also includes the following technical features.

[0076] like Figures 3 to 5 As shown, the second hinge component 320 is mounted on the door panel 200 by fastener 322. The second hinge component 320 is provided with a through hole 321 for the fastener 322 to pass through, and a sealing cover 500 for hiding the fastener 322 is also provided on the through hole 321.

[0077] In this embodiment, the second hinge component 320 is mounted on the door panel 200 via fastener 322 and equipped with a sealing cover 500, further improving the detailed protection and aesthetic consistency of the concealed structure 400. The sealing cover 500 on the through hole 321 completely covers the fastener 322, keeping the surface of the door panel 200 smooth and flat. Simultaneously, the sealing cover 500 also protects the fastener 322, effectively preventing corrosion of the connecting components by external humid and dusty environments, reducing the risk of loosening due to fastener 322 corrosion. During long-term use, even under frequent opening and closing or extreme environments, the connection between the second hinge component 320 and the door panel 200 remains stable, preventing abnormal opening and closing of the fire door due to component loosening, and effectively ensuring the reliability of personnel evacuation and fire containment during a fire. Furthermore, the fastener 322 here is a screw 423, and the sealing cover 500 is made of fire-resistant material.

[0078] Furthermore, the sealing cap 500 includes:

[0079] The cover 510 is annular in shape, and its surface is provided with a groove 511;

[0080] An extension protrusion 520 is provided at the bottom of the cover 510, and a limiting protrusion 521 is provided on the extension protrusion 520 extending outward;

[0081] A clearance groove 530 is provided on the through hole 321 and is used for the limit protrusion 521 to pass through, and a limit slot 531 adapted to the extension protrusion 520 is provided in the through hole 321.

[0082] The cover 510 is inserted into the through hole 321, and the limiting protrusion 521 can be engaged into the limiting slot 531 by rotating the cover 510.

[0083] The annular cover 510 of the sealing cover 500, combined with the structural design of the slot 511, the extension protrusion 520, and the limiting protrusion 521, not only conceals the fastener 322 but also significantly improves installation convenience and connection reliability. The shape of the annular cover 510 matches the through hole 321, and the slot 511 on its surface provides a force point for the installation tool. By rotating the cover 510, the limiting protrusion 521 can be engaged with the limiting slot 531 in the through hole 321 without additional tools or complicated operations. This ensures that the sealing cover 500 is flush with the surface of the door panel 200 and facilitates disassembly and replacement during later maintenance, combining practicality and convenience.

[0084] The design of the extension protrusion 520 and the limiting protrusion 521 creates a mechanical locking structure between the sealing cover 500 and the through hole 321. After the extension protrusion 520 is inserted into the through hole 321, rotating the cover body 510 causes the limiting protrusion 521 to engage with the corresponding limiting slot 531 in the clearance groove 530. This effectively prevents the sealing cover 500 from falling off due to vibration or external force, ensuring long-term protection of the fastener 322. This avoids the problem of easy detachment of traditional adhesive or simple snap-fit ​​sealing covers 500. Even when the fire door is frequently opened and closed or subjected to impact, the sealing cover 500 can still be firmly attached, effectively avoiding the risk of corrosion of the connecting parts due to moisture, dust, and other factors.

[0085] Example 5:

[0086] This application provides an installation structure for a fire door. In addition to the above-mentioned technical features, the installation structure for the fire door in this application also includes the following technical features.

[0087] like Figure 3 and Figure 4 As shown, the door frame 100 is also provided with a sealing element 600 that contacts the door panel 200, which is used to seal when the door panel 200 is closed.

[0088] In this embodiment, the sealing element 600 installed on the door frame 100 forms a tight fit with the door panel 200 when closed, further enhancing the fireproof sealing performance and environmental adaptability of the fire door. The sealing element 600 is strip-shaped and made of fireproof material. When the door panel 200 is closed, the sealing element 600 fills the gap between the door frame 100 and the door panel 200. Together with the hidden frame 410, hidden groove 420, and other structures, it physically blocks the penetration of high-temperature smoke, flames, and dust, improving the fireproof separation and sealing effect of the fire door in a fire.

[0089] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0090] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An installation structure for a fire door, characterized in that: include: Door frame (100); Door panel (200); The mounting assembly (300) includes a first hinge member (310) connected to the door frame (100), a second hinge member (320) connected to the door panel (200), and a hinge shaft (330) connecting the two hinges. The concealed structure (400) includes a concealed frame (410) disposed on the door panel (200), a concealed groove (420) disposed on the door frame (100), and a limiting groove (430) disposed on the door frame (100) for the second hinge member (320) to rotate; Among them, the end of the hidden frame (410) away from the door panel (200) extends to the outside of the hinge axis (330), and the end of the first hinge piece (310) away from the second hinge piece (320) extends into the hidden groove (420).

2. The installation structure of a fire door according to claim 1, characterized in that: The hidden frame (410) is L-shaped and wrapped around the hinge shaft (330), and the hidden frame (410) is located in the limiting groove (430) and can rotate in the limiting groove (430).

3. The installation structure of a fire door according to claim 1, characterized in that: The limiting groove (430) is rectangular and recessed into the inner door frame (100), and the limiting groove (430) is provided with a contact angle (421) for limiting the rotation angle of the door panel (200).

4. The installation structure of a fire door according to claim 1, characterized in that: The hidden slot (420) is provided with: Mounting bracket (422); Screw (423); The first hinge component (310) is fixed to the mounting base (422) by screws (423).

5. The installation structure of a fire door according to claim 1, characterized in that: The second hinge component (320) is mounted on the door panel (200) by a fastener (322). The second hinge component (320) is provided with a through hole (321) through which the fastener (322) passes. A sealing cap (500) for hiding the fastener (322) is also provided on the through hole (321).

6. The installation structure of a fire door according to claim 5, characterized in that: The sealing cap (500) includes: The cover (510) is annular, and its surface is provided with a groove (511); An extension protrusion (520) is provided at the bottom of the cover (510), and a limiting protrusion (521) is provided on the extension protrusion (520) extending outward; A clearance groove (530) is provided on the through hole (321) and is used for the limit protrusion (521) to pass through, and a limit slot (531) adapted to the extension protrusion (520) is provided in the through hole (321); When the cover (510) is inserted into the through hole (321), the limiting protrusion (521) can be inserted into the limiting slot (531) by rotating the cover (510).

7. The installation structure of a fire door according to claim 1, characterized in that: The door frame (100) is also provided with a sealing element (600) that contacts the door panel (200) for sealing when the door panel (200) is closed.

Images