Door leaf sealing structure, armored door and door leaf manufacturing process

Abstract

This invention discloses a door leaf sealing structure, an armored door, and a door leaf manufacturing process, belonging to the field of door leaf manufacturing technology. The door leaf includes an inner panel, an outer panel, and aluminum profiles for side frames respectively disposed on both sides of the door leaf. The contact surface between the side frame aluminum profiles and the panel has a concave-convex structure, with multiple independent injection cavities on each convex surface. Each injection cavity has an injection nozzle penetrating the wall of the side frame aluminum profile for injecting sealant into the corresponding cavity. The segmented welding provides structural connection strength, while the cured sealant in each injection cavity provides sealing performance, forming a complementary combination. Each injection cavity is independent, achieving a relay-like renewal of sealing performance. The sealing quality of each side can be quantitatively verified before leaving the factory, and the sealing status can be continuously monitored during use by reading air pressure values, allowing users to visually judge the sealing status without specialized equipment.

Description

Technical Field

[0001] This invention relates to the field of door manufacturing technology, specifically to a door sealing structure, a door manufacturing process, and an armored door using the sealing structure. Background Technology

[0002] Existing security doors, such as burglarproof doors and fire doors, typically consist of an inner panel, an outer panel, frame profiles on both sides (i.e., the door frame), and a core material filling the space between the inner and outer panels. For these types of doors with a core filling structure, the door's sealing performance directly affects the lifespan of the core and its sound insulation, heat insulation, and smoke prevention functions. However, under current technological conditions, it is difficult for doors with a core to maintain good sealing performance over long-term use. The fundamental reason for this is the inherent sealing limitations in the connection process between the frame profiles and the panels.

[0003] In terms of welding technology, continuous welding is not possible between the frame profile and the panel. This is because a core material needs to be placed inside the door leaf, and the large amount of welding heat generated by continuous welding would cause severe thermal deformation on the profile and panel. This deformation is extremely difficult to correct on such a thin-walled, large-area structure as the door leaf. Therefore, in actual production, only segmented welding can be used, i.e., intermittent welding along the intersection line of the frame profile and the panel. For example, Chinese patent CN208056974U discloses a burglarproof security door anti-dismantling structure, in which the inner and outer door panels are welded together, a mesh-like inner frame is welded to the inner side of the inner door panel, and the door leaf cavity is filled with an adhesive filler. Although this solution improves the door leaf's anti-vandalism performance through welding and filler, the welding between the panel and the frame is still constrained by thermal deformation, inevitably resulting in unwelded gaps. These gaps constitute an inherent defect in the door's sealing.

[0004] Regarding adhesive bonding, when the panel material and frame profile cannot be welded (e.g., a combination of a steel panel and an aluminum frame, or a combination of wood veneer and a steel core), structural adhesive is typically used for bonding. Chinese patent CN203584237U discloses an armored door whose door leaf consists of a steel core and front and rear decorative panels located on both sides of the steel core. The steel core and the decorative panels are bonded together using a transition plate with an adhesive surface. While this solution increases the contact area and improves bonding strength by sandblasting the uneven surface of the transition plate, its background also points out that after a period of use, the armored door may experience panel bulging and loosening of the edging, indicating that adhesive bonding still faces the risk of failure in long-term use. Chinese patent CN105041155B discloses a manufacturing process for a security door, where the panel and fireproof material are bonded with adhesive and secured with rivets before drying. This solution also relies on adhesive bonding to achieve the connection between the panel and the inner core. While adhesive bonding may initially meet sealing requirements, over time, the door panel experiences constant vibration during opening and closing, and the panel itself is stressed by its own weight and external forces. Furthermore, repeated temperature changes cause differences in thermal expansion and contraction between different materials. Under the long-term cumulative effect of these factors, localized delamination of the adhesive layer is inevitable. This is not a defect specific to any particular adhesive, but rather an inherent characteristic of adhesive bonding under long-term alternating loads and environmental changes.

[0005] As can be seen from the above, regardless of whether welding or adhesive bonding is used, the connection between the frame profile and the panel cannot maintain a perfect seal throughout the entire lifespan of the door. Welding inherently introduces sealing defects at the weld intervals from the moment of manufacture, while adhesive bonding gradually leads to localized delamination over time. Both methods result in a decline in the door's sealing performance over time.

[0006] However, existing technologies lack effective means to remedy the aforementioned sealing defects after door manufacturing, and also lack technical methods for quantitatively testing the sealing performance of the door. Among the aforementioned patent documents, CN208056974U only enhances the overall strength of the door through filler bonding, CN203584237U slows down panel detachment by improving the adhesive surface, and CN105041155B strengthens the connection between the panel and the core through adhesive and rivets; however, none of these address the issues of remedying, testing, and maintaining the door's sealing performance. Manufacturers cannot determine the sealing quality of different parts of the door through objective data, and the decline in sealing performance during use is difficult to detect in a timely manner. Furthermore, existing door panels lack the capability to repair sealing defects on-site without disassembling the panel or damaging the original structure.

[0007] In addition, regarding the door leaf structure, when the door leaf needs to use two different materials for the panel, if the frame profile is an integral structure, after the connection of one panel is completed, the frame profile has formed a closed or semi-closed frame structure, which causes larger inner cores to be unable to be placed into the inner cavity of the door leaf due to structural interference, resulting in assembly difficulties.

[0008] In summary, the existing door panel structure has shortcomings in terms of sealing limitations in the connection process, quantitative testing and long-term monitoring of sealing performance, on-site repairability of sealing defects, and assembly adaptability of panels made of different materials, and these shortcomings need to be improved. Summary of the Invention

[0009] To address the problems existing in the aforementioned background technology, the purpose of this invention is to provide a door leaf sealing structure, an armored door, and a door leaf manufacturing process, so that the segment welding process or adhesive bonding process and the secondary glue injection sealing complement each other, making up for the inherent sealing deficiencies in the connection process between the frame profile and the panel; at the same time, through the design of multiple independent glue injection cavities, the door leaf sealing performance can be repeatedly updated throughout its entire life cycle without disassembling the panel or damaging the original structure; and to provide technical means for quantitative testing and long-term monitoring of the door sealing performance.

[0010] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a door leaf sealing structure, the door leaf comprising an inner panel, an outer panel, and side frame aluminum profiles respectively disposed on both sides of the door leaf. The panel and the side frame aluminum profiles are connected by segment welding. The contact surface between the side frame aluminum profiles and the panel is provided with a concave-convex surface structure, and each protruding surface of the concave-convex surface structure is provided with an adhesive strip; after the panel and the side frame aluminum profiles are combined, the adhesive strips adhere to the panel, so that the concave space between adjacent protruding surfaces forms multiple independent injection cavities extending along the length direction of the profile; each injection cavity is surrounded by the adhesive strips on both sides of the protruding surface, the concave bottom wall, and the panel. Each injection cavity is provided with an injection nozzle penetrating the wall of the side frame aluminum profile for injecting sealant into the corresponding injection cavity; the sealant extends longitudinally along the injection cavity and fills the segment weld interval area, and forms a continuous sealing layer after curing. The segmented welding provides structural connection strength, while the cured sealant in each injection cavity provides sealing performance, and the two complement each other. Each injection cavity is independent of each other, supporting the injection of sealant in separate cavities at different times to achieve a relay update of sealing performance.

[0011] In one optional embodiment, the panel and the side frame aluminum profile are connected by fillet welding, with the panel surface and the end face of the side frame aluminum profile overlapping at a right angle, and the weld forming at the intersection of the two. The injection nozzle is sealed with a reusable threaded plug. A sealing strip mounting groove is provided on the side frame aluminum profile, and a sealing strip is installed in the groove. After installation, the sealing strip covers the area where the weld is located, and the outer opening of the injection nozzle is located within the area covered by the sealing strip mounting groove. This design allows the sealing strip to simultaneously cover the weld and the injection nozzle after installation; during maintenance, the sealing strip can be removed to expose the injection nozzle for operation.

[0012] In one optional embodiment, the side frame aluminum profile is provided with at least one air pressure detection hole. The air pressure detection hole is a through-hole penetrating the wall of the side frame aluminum profile, with its inner end connecting to the sealing cavity between the panel and the side frame aluminum profile, and its outer end fitted with a detachable air pressure valve. Micro-positive pressure gas is injected into the sealing cavity through the air pressure valve, and the sealing performance is determined based on the air pressure change over a set time. The air pressure valve is retained on the door leaf after factory testing. At the time of manufacture, the sealing cavity is maintained at a micro-positive pressure and the air pressure valve is closed, for subsequent assessment of the sealing performance status via a connected air pressure detection device or by visually inspecting the air pressure indicator mounted on the air pressure valve. Through this design, changes in the door leaf's sealing performance can be continuously monitored throughout its entire lifespan.

[0013] In one optional embodiment, the door leaf further includes an upper sealing plate and a lower sealing plate that respectively seal the top and bottom of the door leaf. The door leaf has at least one air injection channel communicating with the inner cavity of the door leaf. An air pressure valve is installed at the outer end of the air injection channel to inject slightly positive pressure gas into the entire inner cavity of the door leaf, which is formed by the inner panel, outer panel, side frame aluminum profiles, and the upper and lower sealing plates. The air pressure changes are recorded by an air pressure display to determine the overall sealing performance of the door leaf. This overall airtightness testing system for the door leaf cavity allows for quantitative verification of the sealing quality of the inner cavity.

[0014] In one optional embodiment, the side frame aluminum profile is an integral structure, including a first side frame aluminum profile and a second side frame aluminum profile, each extending along the entire thickness of the door leaf to form the left and right sides of the door leaf; aluminum foil filler is provided between the inner panel and the outer panel. This integral structure is suitable when both the inner panel and the outer panel are made of materials that can be welded to the aluminum profile.

[0015] In one optional embodiment, the side frame aluminum profile is a split structure, with each side of the door leaf formed by the butt joint of an inner side frame aluminum profile and an outer side frame aluminum profile. The inner panel is connected to the first and second inner side frame aluminum profiles to form an inner panel assembly, and the outer panel is connected to the first and second outer side frame aluminum profiles to form an outer panel assembly. Each inner and outer side frame aluminum profile has a raised / lower surface structure and an injection cavity on its contact surface with the panel. An interlocking structure is provided at the joint between the inner and outer side frame aluminum profiles, and at least one injection nozzle is provided at the mating surface for injecting sealant into the joint. A fireproof frame is provided between the inner and outer panel assemblies. This split structure solves the problem of internal core assembly interference caused by an integral frame when the panel material and aluminum profile cannot be welded. The interlocking structure ensures the positioning accuracy when the inner and outer side frame aluminum profiles are butt jointed.

[0016] Secondly, the present invention provides an armored door, including a door frame and at least one door leaf with the aforementioned door leaf sealing structure, wherein the door leaf is hinged to one side of the door frame. When the armored door includes two door leaves, the two door leaves are respectively hinged to both sides of the door frame. When the two door leaves are closed, the sealing strip mounting grooves on the mating sides that are close to each other are respectively provided on different sides of the aluminum profile of their respective side frames along the thickness direction of the door leaf, so that when the two door leaves are closed, the sealing strips on the mating sides form a staggered overlap in the thickness direction of the door leaf, thereby achieving effective sealing at the middle joint.

[0017] Thirdly, the present invention provides a door leaf manufacturing process for manufacturing the aforementioned door leaf sealing structure, comprising the following steps: Step 1, inner panel welding: the inner panel is aligned with the side frame aluminum profile and connected to the side frame aluminum profile using a segment welding process; Step 2, inner core laying: the filler is placed on the inner side of the inner panel and positioned between the two side frame aluminum profiles; Step 3, outer panel welding: the outer panel is snapped onto the top of the side frame aluminum profile and connected using a segment welding process; Step 4, sealing plate closure: the upper sealing plate and lower sealing plate are fixed to the top and bottom of the door leaf frame respectively, closing the openings at the top and bottom of the door leaf and the openings at both ends of each glue injection cavity; Step 5, glue injection sealing: sealant is injected into the selected glue injection cavity through the glue injection nozzle on the side frame aluminum profile, while the remaining glue injection cavities are left empty as reserved cavities for subsequent maintenance.

[0018] In one optional embodiment, the sealant injection in step five employs a bottom-injection, top-outjection process: the door leaf is placed vertically or at an angle, with the lower injection nozzle serving as the injection port and the higher venting observation port positioned above. The sealant fills the injection cavity from bottom to top, and the venting observation port is sealed when sealant overflows. The sealant is an addition-curing two-component silicone potting compound. This type of compound cures to form an elastomer, and its addition-curing process does not release small molecule byproducts, thus preventing the formation of bubbles or corrosion of the aluminum material within the sealed cavity.

[0019] In one optional embodiment, step five is followed by the following steps: air pressure testing of the sealed cavity; after the sealant has cured, a slightly positive pressure gas is injected into the sealed cavity through the air pressure testing hole on the side frame aluminum profile; after maintaining the pressure for a set time, the pressure change is detected; if the pressure remains stable or the decrease is within the allowable range, the seal is deemed qualified; otherwise, the sealant is repaired and the test is repeated; overall air tightness testing of the inner cavity of the door; after the air pressure testing of the sealed cavities on each side is qualified, a slightly positive pressure gas is injected into the inner cavity of the door leaf through the air injection channel set on the door leaf; after maintaining the pressure for a set time, the pressure change is observed; if the pressure remains stable or the decrease is within the allowable range, the overall air tightness of the door leaf is deemed qualified; installation of the sealing strip; the sealing strip is installed into the sealing strip installation groove on the side frame aluminum profile; after installation, the sealing strip covers the weld between the panel and the side frame aluminum profile and covers the injection nozzle and the air pressure testing hole. The aforementioned air pressure detection system, the cavity-based and time-based glue injection design, and the detachable structure of the threaded plug work together to form a complete maintenance closed loop: after the air pressure monitoring detects an abnormality in the seal, new glue is injected into an empty cavity to achieve a seal relay, and then the repair effect is verified by air pressure testing. The entire process does not involve disassembling the door, damaging the panel, or affecting the welding structure.

[0020] The door sealing structure, armored door, and door manufacturing process provided by this invention have at least the following advantages compared to existing technologies: (1) Segment welding and adhesive injection complement each other. Segment welding provides structural connection strength, while adhesive injection provides sealing performance. Each performs its own function. The segment welding process effectively controls welding thermal deformation, and adhesive injection fills the interval areas of segment welding and the small gaps in welding, making up for the inherent deficiencies of segment welding in sealing, so that the door leaf can obtain good structural strength and sealing performance at the same time.

[0021] (2) Separate cavity and timed glue injection enables relay renewal of sealing performance. Multiple independent glue injection cavities mean that only some cavities need to be glued at the factory to meet the sealing requirements, while the remaining cavities serve as reserved channels for subsequent maintenance. When a glued cavity fails due to aging, a new glue can be injected into an empty cavity. After the new glue cures in the independent cavity, it takes over the sealing function of the original glue layer. Each renewal uses a brand new cavity, and the sealing performance is equivalent to the first glue injection. The door leaf can support multiple relay sealing renewals throughout its entire life cycle without disassembling the panel or damaging the welded structure.

[0022] (3) Sealing performance can be quantitatively tested and monitored over a long period of time. The pressure testing of the sealed cavity is achieved through the air pressure detection hole and the air pressure valve. The sealing quality of each side can be quantitatively verified before leaving the factory, and the sealing status can be continuously monitored by reading the air pressure value during use. The air pressure indicator allows users to visually judge the sealing status without special equipment.

[0023] (4) The overall airtightness of the door cavity can be quantitatively verified. By injecting slightly positive pressure gas into the entire inner cavity of the door leaf through the air injection channel and detecting the pressure change, the sealing performance of the inner cavity of the door leaf can be quantitatively verified. After the inner cavity of the door leaf is sealed, the inner core filling material is in a sealed environment and is not subject to the intrusion of external water vapor and corrosive gases. The sound insulation and heat insulation performance is fully utilized, and the service life of the inner core is extended.

[0024] (5) The positions of the sealing strip installation groove, weld, injection nozzle and air pressure detection hole are designed in a coordinated manner. After the sealing strip is installed, it covers the weld and shields the maintenance interface, making the door leaf look neat. During maintenance, only the sealing strip needs to be removed locally, making maintenance convenient.

[0025] (6) The split frame aluminum profile structure solves the problem of core assembly interference caused by the integral frame when the panel material and aluminum profile cannot be welded by dividing the side frame into inner and outer parts, thus expanding the range of panel materials that can be selected. The interlocking structure ensures the docking positioning accuracy of the inner and outer frame aluminum profiles, and the glue injection seal at the docking seam ensures the sealing reliability of the split structure.

[0026] (7) The double-leaf armored door uses a differentiated setting of the sealing strip installation groove on the docking side so that the sealing strips of the two doors can be staggered and overlapped in the thickness direction when the doors are closed, thus achieving effective sealing at the joint.

[0027] (8) The bottom-injection and top-outjection potting process utilizes gravity and injection pressure to fill the cavity with adhesive from bottom to top. Air in the cavity is discharged through the exhaust observation port, avoiding residual air bubbles in the adhesive layer and ensuring the continuity and integrity of the sealing layer. The addition-type two-component silicone potting compound forms an elastomer after curing. The curing process does not release small molecule byproducts, making it suitable for long-term use in closed cavities. Attached Figure Description

[0028] Figure 1 – Figure 2 Example 1: Front view and top cross-sectional view of the integral frame door leaf; Figure 3 Example 2: Front view and top cross-sectional view of the split frame door panel; Figure 4 : Schematic diagram of the step-by-step relay of cavity-based and time-based glue injection sealing performance; Figure 5 : Top-down exploded view of the door structure; Figure 6 :yes Figure 2 A magnified view of a section at point A in the middle; Figure 7 :yes Figure 2 A magnified view of a section at point B in the middle; Figure 8 : This is a cross-sectional view of components such as the first outer frame aluminum profile 15 and the first inner frame aluminum profile 32 in Embodiment 2.

[0029] Marked in the image: Door leaf main structure: Door leaf 1; Inner panel 11; Outer panel 12; First side frame aluminum profile 13; Second side frame aluminum profile 14; First outer side frame aluminum profile 15; Second outer side frame aluminum profile 16; Aluminum foil filler 23; Inner panel 30; Outer panel 31; First inner side frame aluminum profile 32; Second inner side frame aluminum profile 33; Fireproof frame 21; Interlocking structure 20; Sealing and Injection System: Concave-convex surface structure 10; Adhesive strip 101; Injection cavity 102; Injection nozzle 24; Sealant 25; Sealing strip mounting groove 17; Sealing strip 18; Air pressure detection system: air pressure detection port 26; air pressure valve nozzle 27; Hardware: Hinges 19. Detailed Implementation

[0030] The present invention will now be described in detail with reference to all the accompanying drawings and embodiments.

[0031] Example 1: Complementary sealing structure of segmented welding and cavity glue injection for integral frame door leaf This embodiment provides a door leaf sealing structure and its manufacturing process. The core of this structure lies in: achieving a structural connection between the frame aluminum profile and the panel through segmented welding; and simultaneously utilizing multiple independent glue injection cavities on the contact surface of the side frame aluminum profile to achieve the sealing function, with the two complementing each other. Welding provides structural connection strength, while glue injection ensures sealing performance. The independent design of each glue injection cavity further supports segmented and timed glue injection, allowing the door leaf to undergo multiple consecutive updates to its sealing performance throughout its lifespan.

[0032] See Figure 1 and Figure 2The height of door leaf 1 is 1800mm to 2400mm, and the width is 700mm to 1200mm. Door leaf 1 includes an inner panel 11, an outer panel 12, first side frame aluminum profiles 13 and second side frame aluminum profiles 14 respectively disposed on both sides of door leaf 1, aluminum foil filler 23 disposed between the inner panel 11 and the outer panel 12, and upper and lower sealing plates respectively sealing the top and bottom of door leaf 1. The inner panel 11 faces indoors, and the outer panel 12 faces outdoors.

[0033] The first side frame aluminum profile 13 and the second side frame aluminum profile 14 are integral structures, that is, when viewed from above... Figure 2 Each panel extends along the entire thickness of the door leaf 1 at the specified angle, forming the left and right sides of the door leaf 1. The inner panel 11 is connected to the first side frame aluminum profile 13 and the second side frame aluminum profile 14 by fillet welding; the outer panel 12 is also connected to the first side frame aluminum profile 13 and the second side frame aluminum profile 14 by fillet welding. During fillet welding, the surface of the panel overlaps the end face of the side frame aluminum profile at a right angle, using a segment welding process, with the weld seam formed at the intersection of the two.

[0034] See Figure 4 and Figure 6 The first side frame aluminum profile 13 and the second side frame aluminum profile 14 are provided with concave-convex surface structures 10 on their contact surfaces with the panel. Each protruding surface of the concave-convex surface structure 10 is provided with an adhesive strip 101. After the panel and the side frame aluminum profiles are combined, the adhesive strips 101 on each protruding surface are tightly fitted to the panel, dividing the concave space between adjacent protruding surfaces into multiple independent glue injection cavities 102 extending along the length of the profile. Each glue injection cavity 102 is formed by the adhesive strips on both sides of the protruding surface, the concave bottom wall, and the panel. Each glue injection cavity 102 has an extended glue injection nozzle 24, and at least one glue injection nozzle 24 is provided. The glue injection nozzle 24 is sealed with a reusable threaded plug. The glue injection nozzle 24 is a through hole penetrating the wall of the side frame aluminum profile, with its inner end connected to the corresponding independent glue injection cavity and its outer end opening onto the exposed surface of the side frame aluminum profile.

[0035] See Figure 4 Sealant 25 is injected into the injection cavity through the injection nozzle 24. Under the action of injection pressure and its own fluidity, the sealant 25 extends longitudinally along the injection cavity and penetrates and fills the weld interval area and the tiny gaps in the weld. After curing, it forms a continuous elastic sealing layer. Thus, the weld provides structural connection strength, and the sealant provides sealing performance. The two complement each other, fundamentally solving the inherent shortcomings of the weld process in terms of sealing.

[0036] The design of the above-mentioned injection cavity 102 further realizes the segmented and timed injection of sealant, see [link to relevant documentation]. Figure 4This diagram illustrates the sequential sealing performance of the door leaf 1 through a multi-stage, time-based adhesive injection system. Specifically, before the door leaf 1 leaves the factory, only one or two injection cavities are filled with sealant 25 to meet the factory sealing performance requirements; the remaining injection cavities 102 remain empty, serving as reserved channels for subsequent maintenance. During actual use of the door leaf 1, when the sealing performance of the already injected cavities deteriorates due to aging, shrinkage, or other reasons, maintenance personnel can select one or more empty injection cavities 102 to inject new sealant 25, depending on the situation. The newly injected sealant 25 cures in the independent injection cavity 102 and takes over the sealing function of the original cavities, achieving a sequential sealing performance upgrade. Because each injection cavity 102 is independent, the newly injected sealant is not affected by the aged cavities, and its sealing performance is equivalent to the initial injection. Depending on the number of independent injection cavities, the door leaf 1 can support multiple sealing performance upgrades, each using entirely new cavities, ensuring continuous sealing performance throughout the entire lifespan of the door leaf.

[0037] The sealant 25 is preferably injected using a bottom-injection, top-outjection process. Specifically, the door leaf 1 is placed vertically or at an angle, with the lower nozzle 24 serving as the injection port and the higher nozzle serving as the venting observation port. The sealant 25 is injected through the injection port, and under the combined action of gravity and injection pressure, the sealant fills the contact cavity from bottom to top, while air within the cavity is expelled through the venting observation port. When sealant overflows from the venting observation port, it indicates that the cavity is completely filled; the venting observation port is then sealed, completing the sealant injection. The sealant 25 used for the initial factory injection is preferably a medium-viscosity addition-curing two-component silicone potting compound. This type of sealant cures to form an elastomer, and the addition-curing process does not release small molecule byproducts, thus preventing the formation of bubbles or corrosion of the aluminum material within the sealed cavity.

[0038] See Figure 4 Each aluminum profile of the side frame is provided with at least one air pressure detection hole 26. The air pressure detection hole 26 is a through hole penetrating the wall of the side frame aluminum profile, with its inner end connecting to the sealing cavity between the panel and the side frame aluminum profile, and its outer end installed with a detachable air pressure valve 27. The air pressure valve 27 has a one-way sealing function and can be connected to an external air pressure detection device for inflation and pressure measurement. Before the door leaf 1 leaves the factory, after the glue injection process is completed and the sealant 25 is completely cured, a slightly positive pressure gas is injected into the sealing cavity between the panel and the side frame aluminum profile through the air pressure valve 27, and the initial air pressure value is recorded. After maintaining the pressure for a set time, the air pressure change is detected. If the air pressure remains stable or the drop is within the allowable range, the weld and glue layer seal on that side is deemed qualified; if the air pressure drops beyond the allowable range, the seal is deemed defective, and it needs to be repaired with glue and retested until it is qualified. Each side of each door leaf 1 has an independent air pressure detection capability, and the inspection results are traceable and recordable.

[0039] In a preferred embodiment, the air pressure valve 27 is not removed after factory testing, but is retained on the door leaf 1 as a long-term monitoring interface. At the factory, the air pressure valve 27 is maintained under a slightly positive pressure within the qualified sealing cavity and is sealed. During the use of the door leaf 1, if micro-cracks develop in the weld due to long-term fatigue, or if the sealant layer shrinks due to aging, the air pressure within the sealing cavity will slowly decrease. During periodic inspections, maintenance personnel can connect an air pressure testing device to the air pressure valve 27 to read the current air pressure value and compare it with the factory recorded value to determine whether the sealing performance of the door leaf 1 is still intact.

[0040] In another preferred embodiment, a miniature air pressure indicator is installed on the air pressure valve 27. The air pressure indicator has a visual dial or indicator markings. Users or maintenance personnel can determine the sealing status of the door leaf 1 simply by visually observing the reading of the air pressure indicator, without the need for specialized testing equipment.

[0041] In addition to the air pressure detection of the contact channels between the above-mentioned panel and the side frame aluminum profiles, the door leaf 1 is also equipped with an overall airtightness detection system for the inner cavity of the door body. Specifically, at least one air injection channel communicating with the inner cavity of the door leaf 1 is provided on the first side frame aluminum profile 13 or the second side frame aluminum profile 14, or at an appropriate position on the inner panel 11 or the outer panel 12. The air injection channel is a through hole penetrating the wall surface of the side frame aluminum profile or the panel, the inner end of which communicates with the inner cavity of the door leaf 1 jointly enclosed by the inner panel 11, the outer panel 12, the side frame aluminum profiles, the upper sealing plate and the lower sealing plate, and the outer end is equipped with a pneumatic valve nozzle. After all the assembly processes of the door leaf 1 are completed, the upper sealing plate and the lower sealing plate are installed in place and the glue injection seals on all sides are qualified, a slightly positive pressure gas is filled into the overall inner cavity of the door leaf 1 through the air injection channel, and the initial air pressure value is recorded by the air pressure holding display meter installed at the outer end of the air injection channel. After maintaining the set time, observe the change in the reading of the air pressure holding display meter. If the air pressure remains stable within the set time or the drop is within the allowable range, it is determined that the overall sealing performance of the door leaf 1 is qualified; if the air pressure drop exceeds the allowable range, it is determined that there are sealing defects in the door body, and it needs to be checked and repaired and then re-tested until it is qualified. In the prior art, for door leaves with an inner core filling structure such as anti-theft doors and fire doors, during their manufacturing processes, no secondary glue injection sealing and air pressure holding detection means for the inner cavity of the door body are adopted, and there is a lack of quantitative inspection basis for the overall sealing performance of the door body. Through the above-mentioned overall airtightness detection system for the inner cavity of the door body, the present invention first realizes the quantitative verification of the sealing performance of the inner cavity of the door leaf 1. After the sealing performance of the inner cavity of the door body is qualified, the inner core filling material of the door leaf 1 is in a sealed environment and is not invaded by water vapor and corrosive gases in the external air, and the service life of the inner core is extended; at the same time, the well-sealed inner cavity of the door body enables the sound insulation and heat insulation performance of the inner core filling material to be fully exerted. On this basis, the sealing function between the door leaf 1 and the door frame is completely borne by the sealing strip 18, forming a double sealing system in which the door body sealing and the door seam sealing perform their respective functions.

[0042] The above-mentioned air pressure detection system, the design of injecting glue into different cavities at different times, and the detachable structure of the threaded plug jointly form a complete maintenance closed-loop: when the air pressure monitoring discovers abnormal sealing, select an empty cavity to inject new glue to achieve sealing relay, and the air pressure detection verifies the repair effect. The entire maintenance process does not require door disassembly, does not damage the panel, does not affect the welding structure, and can be completed on-site.

[0043] See Figures 6 to 8A sealing strip mounting groove 17 is provided on the side frame aluminum profile of the door leaf 1, and a sealing strip 18 is installed in the sealing strip mounting groove 17. Its specific location is determined according to the door type of the door leaf 1 and the overlapping sealing relationship between the door leaf 1 and the door frame or adjacent door leaves. The position of the weld between the panel and the side frame aluminum profile is designed in conjunction with the position of the sealing strip mounting groove 17. Specifically, the weld formed by the fillet weld is located on the exposed surface of the side frame aluminum profile, and the sealing strip mounting groove 17 is set at the corresponding position in the area of ​​the weld, so that the sealing strip 18, after installation, precisely covers the weld. Simultaneously, the outer openings of the injection nozzle 24 and the air pressure detection hole 26 are preferably located within the area covered by the sealing strip mounting groove 17, so that the sealing strip 18, after installation, simultaneously covers the threaded plug of the injection nozzle 24 and the air pressure valve 27 of the air pressure detection hole 26. During maintenance, removing this section of the sealing strip 18 exposes the injection nozzle 24 and the air pressure detection hole 26.

[0044] The manufacturing process of door leaf 1 in this embodiment is as follows: Step 1: Welding the inner panel 11 to the side frame aluminum profiles. Lay the inner panel 11 flat. Align the first side frame aluminum profile 13 and the second side frame aluminum profile 14 to the two sides of the inner panel 11. Use segment welding to connect the panel to the side frame aluminum profiles (see...). Figure 1 and Figure 2 ); Step 2, laying the filler: place the aluminum foil filler 23 in a compressed state on the inner side of the inner panel 11, between the first side frame aluminum profile 13 and the second side frame aluminum profile 14, and then stretch it out to fill the inner cavity. Step 3, installation of hinge 19 and lock: Install hinge 19 onto the aluminum profile 13 of the first side frame (see...). Figure 1 Install the lock onto the aluminum profile 14 of the second side frame; Step 4: Welding of the outer panel 12. The outer panel 12 is fastened to the top of the first side frame aluminum profile 13 and the second side frame aluminum profile 14. The connection method is the same as in Step 1. Step 5: Closing the upper and lower sealing plates. Fix the upper and lower sealing plates to the top and bottom end faces of the door leaf 1 frame, respectively, to close the openings at the top and bottom ends of the door leaf 1 and the openings at both ends of each glue injection cavity 102. The connection method is selected from one or more combinations of welding, gluing, mechanical fastening, and edge snapping according to the material of the sealing plate. The closure of the ends of each glue injection cavity 102 can be achieved by pressing the sealing plate or by using a sealing strip. Step 6, seal with adhesive (see...) Figure 4The sealant 25 is injected into one or two independent injection cavities through the corresponding injection nozzles 24 on the first side frame aluminum profile 13 and the second side frame aluminum profile 14 using a bottom injection and top discharge process. Each side is injected independently, and the remaining injection cavities are left empty as reserved cavities for subsequent maintenance. Step 7: Pressure test of sealed cavity. After the sealant 25 has completely cured, fill each sealed cavity with a slight positive pressure gas through the pressure test hole 26 on each side and maintain it for a set time. Detect the pressure change. If all sides pass the test, the sealing performance meets the standard. If a side fails the test, repair the side with glue and retest until all sides pass. Step 8: Overall airtightness test of the inner cavity of the door. After the air pressure test of the sealed cavities on each side is qualified, a slightly positive pressure gas is injected into the inner cavity of the door leaf 1 through the air injection channel set on the aluminum profile or panel of the side frame. After maintaining the pressure for a set time, observe the change in air pressure. If the air pressure remains stable or the drop is within the allowable range, the overall airtightness of the door leaf 1 is determined to be qualified. Step nine, installation of sealing strip 18 (see...) Figure 8 Install the sealing strip 18 into the sealing strip mounting groove 17. After the sealing strip 18 is installed, it will cover the weld.

[0045] Example 2: Complementary sealing structure of segmented welding and cavity glue injection for split-frame door panels This embodiment provides a door leaf sealing structure and its door leaf manufacturing process. Its core is the same as that of Embodiment 1. The difference is that in this embodiment, the side frame aluminum profile of the door leaf 1 is designed as a split structure to solve the problem of internal core assembly interference caused by the integral frame aluminum profile when the inner or outer panel is made of a material that cannot be welded to the aluminum profile.

[0046] See Figure 5 The door leaf 1 includes an inner panel assembly, an outer panel assembly, a fireproof frame 21 disposed between the two, and an upper sealing plate and a lower sealing plate (not shown in the figure) that respectively close the top and bottom of the door leaf 1.

[0047] The inner panel assembly includes an inner panel 30 and a first inner frame aluminum profile 32 and a second inner frame aluminum profile 33 respectively disposed on both sides of the inner panel 30. The first inner frame aluminum profile 32 and the second inner frame aluminum profile 33 are located in a larger area closer to the inner panel 30 in the thickness direction of the door leaf 1, forming most of the side of the door leaf 1. The inner panel 30 is connected to the first inner frame aluminum profile 32 and the second inner frame aluminum profile 33 by fillet welding to form an integral whole, together constituting the inner panel assembly.

[0048] The structure of the outer panel assembly is similar to that of the inner panel assembly, including an outer panel 31 and a first outer frame aluminum profile 15 and a second outer frame aluminum profile 16 respectively disposed on both sides of the outer panel 31. The outer frame aluminum profiles are located in a smaller area closer to the outer panel 31 in the thickness direction of the door leaf 1. The outer panel 31 is also connected to the first outer frame aluminum profile 15 and the second outer frame aluminum profile 16 by fillet welding, together forming the outer panel assembly.

[0049] With a split structure, the inner and outer panel components can be processed independently, each using either welding or adhesive bonding depending on the panel material. Since the inner frame aluminum profile only covers most, not all, of the thickness of the door leaf 1, the fireproof frame 21 can be inserted into the cavity without interference from the side of the outer frame aluminum profile that has not yet been installed. Finally, the two components are joined and welded together after the fireproof frame 21 is inserted, thus solving the assembly interference problem of the integral frame aluminum profile in this condition. The fireproof frame 21 is a long rectangular frame structure, set within the cavity formed between the inner and outer panel components. An interlocking structure 20 is provided at the joint between the inner and outer frame aluminum profiles (see...). Figure 8 This creates a mechanical interlocking positioning, allowing the two parts to restrain each other when they are mated and fitted together.

[0050] The first inner frame aluminum profile 32, the second inner frame aluminum profile 33, the first outer frame aluminum profile 15, and the second outer frame aluminum profile 16 are all provided with concave and convex surface structures 10 on their contact surfaces with the panel. The construction of the concave and convex surface structures 10 and the principle of forming multiple independent injection cavities 102 are the same as in Embodiment 1.

[0051] Example 3: Single-opening anti-theft armored door This embodiment provides a single-leaf anti-theft armored door, including a door frame and a door leaf 1 as described in Embodiment 1. The door leaf 1 is hinged to one side of the door frame via a hinge 19. Sealing strip mounting grooves 17 are provided on both the hinged side (first side frame aluminum profile 13) and the locking side (second side frame aluminum profile 14) of the door leaf 1. After installation, the sealing strip 18 adheres to the door frame to form a seal. At least one glue injection nozzle 24 and at least one air pressure detection hole 26 are provided on both the hinged and locking sides of the door leaf 1. Each side undergoes independent glue injection sealing and air pressure testing processes before leaving the factory. By providing sealing strips 18 on both the hinged and locking sides, and in conjunction with the glue injection sealing system and the air pressure detection system, multiple seals are formed between the door leaf 1 and the door frame on each side after the door leaf 1 is closed.

[0052] Example 4: Double-leaf anti-theft armored door This embodiment provides a double-leaf anti-theft armored door, including a door frame and two door leaves 1 as described in Embodiment 1. The two door leaves 1 are symmetrically arranged on the left and right and are respectively hinged to both sides of the door frame by hinges 19. The basic structure, glue injection sealing system and air pressure detection system of each door leaf 1 are the same as those in Embodiment 1. The difference is that the setting position of the sealing strip 18 on the two door leaves 1 is different, so as to meet the sealing requirements of the double-leaf door.

[0053] Specifically, see Figure 3 When both door panels 1 are closed, the side of the two door panels 1 that is close to each other is the mating side, and the side that is far away is the hinge side. On the mating side of one door panel 1, the sealing strip mounting groove 17 is located on the side frame aluminum profile near the inner panel 11, and the sealing strip 18 faces the other door panel 1 after installation. Correspondingly, on the mating side of the other door panel 1, the sealing strip mounting groove 17 is located on the side frame aluminum profile near the outer panel 12, and the sealing strip 18 also faces the opposite door panel 1 after installation. When both door panels 1 are closed, the two sealing strips 18 on the mating side form a staggered overlap in the thickness direction of the door panel 1, together achieving a seal at the middle joint. Each side of both door panels 1 is provided with at least one glue injection nozzle 24 and at least one air pressure detection hole 26. Each side undergoes an independent glue injection sealing and air pressure testing process before leaving the factory. Through the differentiated setting of the sealing strip 18 positions, combined with the glue injection sealing system and the air pressure detection system, the double-opening anti-theft armored door can achieve effective sealing at the middle joint and the hinges on both sides.

[0054] The above description is merely a specific embodiment of the present invention and does not constitute any limitation on the present invention. Obviously, those skilled in the art, after understanding the content and principles of the present invention, may make various modifications and changes in form and detail without departing from the principles and structure of the present invention; however, these modifications and changes based on the spirit of the present invention are still within the scope of protection of the claims of the present invention.

Claims

1. A door leaf sealing structure, characterized in that, The door leaf (1) includes an inner panel (11), an outer panel (12), and aluminum profiles for the side frames respectively disposed on both sides of the door leaf (1); The panel and the side frame aluminum profile are connected by segment welding. The contact surface between the side frame aluminum profile and the panel is provided with a concave-convex structure (10), and each protruding surface of the concave-convex structure (10) is provided with an adhesive strip (101); after the panel and the side frame aluminum profile are combined, the adhesive strip (101) is attached to the panel, so that the concave space between adjacent protruding surfaces forms multiple independent glue injection cavities (102) extending along the length direction of the profile; each glue injection cavity (102) is surrounded by the adhesive strip (101) on both sides of the protruding surface, the concave bottom wall and the panel; Each of the glue injection cavities (102) is provided with a glue injection nozzle (24) that penetrates the side frame aluminum profile wall, for injecting sealant (25) into the corresponding glue injection cavity (102); the sealant (25) extends longitudinally along the glue injection cavity (102) and fills the segment weld interval area, and forms a continuous sealing layer after curing. Among them, the segment welding provides structural connection strength, and the cured sealant (25) in each injection cavity (102) provides sealing performance. The two complement each other. Each injection cavity (102) is independent of each other and supports the injection of sealant (25) in separate cavities and at different times to achieve the relay renewal of sealing performance.

2. A door leaf sealing structure according to claim 1, characterized in that The panel and the side frame aluminum profile are connected by fillet welding. The panel surface and the end face of the side frame aluminum profile overlap at a right angle, and the weld is formed at the intersection of the two. The glue injection nozzle (24) is equipped with a reusable threaded plug for sealing. A sealing strip installation groove (17) is provided on the side frame aluminum profile. A sealing strip (18) is installed in the sealing strip installation groove (17). After the sealing strip (18) is installed, it covers the area where the weld is located, and the outer end opening of the glue injection nozzle (24) is set in the area covered by the sealing strip installation groove (17).

3. A door leaf sealing structure according to claim 1, characterized in that At least one air pressure detection hole (26) is provided on the side frame aluminum profile. The air pressure detection hole (26) is a through hole that penetrates the wall of the side frame aluminum profile. Its inner end is connected to the sealing cavity between the panel and the side frame aluminum profile, and its outer end is equipped with a detachable air pressure valve (27). The air pressure valve (27) is used to fill the sealing cavity with slightly positive pressure gas. The sealing performance is determined according to the air pressure change within a set time. The air pressure valve (27) is retained on the door leaf (1) after factory inspection. The sealing cavity is kept in a slightly positive pressure state and the air pressure valve (27) is closed at the factory. It is used to judge the sealing performance status by connecting the air pressure detection device or visually inspecting the air pressure indicator installed on the air pressure valve (27).

4. A door leaf sealing structure according to claim 1, characterized in that The door leaf (1) also includes an upper sealing plate and a lower sealing plate that respectively seal the top and bottom of the door leaf (1); the door leaf (1) is provided with at least one air injection channel that connects to the inner cavity of the door leaf (1), and an air pressure valve is installed at the outer end of the air injection channel for filling the inner cavity of the door leaf (1) formed by the inner panel (11), the outer panel (12), the side frame aluminum profile, the upper sealing plate, and the lower sealing plate with a slightly positive pressure gas, and recording the air pressure change through an air pressure holding display to determine the overall sealing performance of the door leaf (1).

5. A door leaf sealing structure according to any one of claims 1 to 4, characterized in that The side frame aluminum profile is an integral structure, including a first side frame aluminum profile (13) and a second side frame aluminum profile (14), each extending along the entire thickness direction of the door leaf (1) to form the left and right sides of the door leaf (1); aluminum foil filler (23) is provided between the inner panel (11) and the outer panel (12).

6. A door leaf sealing structure according to any one of claims 1 to 4, characterized in that The side frame aluminum profile is a split structure, and each side of the door leaf (1) is formed by connecting the inner side frame aluminum profile and the outer side frame aluminum profile; wherein the inner panel (30) is connected with the first inner side frame aluminum profile (32) and the second inner side frame aluminum profile (33) to form the inner panel assembly, and the outer panel (31) is connected with the first outer side frame aluminum profile (15) and the second outer side frame aluminum profile (16) to form the outer panel assembly; the contact surface between each inner side frame aluminum profile and the outer side frame aluminum profile and the panel is provided with the concave and convex surface structure (10) and the glue injection cavity (102); the joint between the inner side frame aluminum profile and the outer side frame aluminum profile is provided with an interlocking structure (20), and at least one glue injection nozzle (24) is provided at the joint surface for injecting sealant (25) into the joint; a fireproof frame (21) is provided between the inner side panel assembly and the outer side panel assembly.

7. An armored door characterized by, The door includes a door frame and at least one door leaf (1) of the door leaf sealing structure as described in claim 1, wherein the door leaf (1) is hinged to one side of the door frame by a hinge (19); when the armored door includes two door leaves (1), the two door leaves (1) are respectively hinged to the two sides of the door frame, and the sealing strip mounting grooves (17) on the mating sides of the two door leaves (1) when closed are respectively provided on different sides of the aluminum profile of their respective side frames along the thickness direction of the door leaf (1), so that the sealing strips (18) on the mating sides of the two door leaves (1) form a staggered overlap in the thickness direction of the door leaf (1) when closed.

8. A door leaf manufacturing process for manufacturing the door leaf sealing structure according to claim 1, characterized by, Includes the following steps: Step 1, Inner panel welding: Align the inner panel (11) with the side frame aluminum profile and use segment welding process to connect the panel to the side frame aluminum profile; Step 2, Inner core laying: Place the filler on the inner side of the inner panel (11), between the aluminum profiles of the two side frames; Step 3, outer panel assembly and welding: fasten the outer panel (12) to the top of the side frame aluminum profile and connect them using segment welding process; Step 4, sealing: fix the upper sealing plate and the lower sealing plate to the top and bottom of the door leaf (1) frame respectively, and close the openings at the top and bottom of the door leaf (1) and the openings at both ends of each glue injection cavity (102); Step 5, sealant injection: inject sealant (25) into the selected injection cavity (102) through the injection nozzle (24) on the side frame aluminum profile, and leave the remaining injection cavities (102) empty as reserved cavities for subsequent maintenance.

9. A door leaf production process according to claim 8, characterized in that, In step five, the injection of sealant (25) adopts a bottom injection and top discharge process: the door leaf (1) is placed vertically or tilted, so that the injection nozzle (24) located at the lower position is used as the injection port, and the exhaust observation port is set at the higher position. The sealant (25) fills the injection cavity (102) from bottom to top. When the sealant overflows from the exhaust observation port, the exhaust observation port is sealed.

10. A door leaf production process according to claim 8, characterized in that, Following step five, the following are also included in sequence: Air pressure test of sealed cavity: After the sealant (25) has cured, a slightly positive pressure gas is injected into the sealed cavity through the air pressure test hole (26) on the side frame aluminum profile. After maintaining the pressure for a set time, the air pressure change is detected. If the air pressure remains stable or the drop is within the allowable range, the seal is deemed qualified. Otherwise, the sealant is repaired and the test is repeated. Overall air tightness test of the inner cavity of the door: After the air pressure test of the sealed cavity on each side is qualified, a slightly positive pressure gas is injected into the inner cavity of the door (1) through the air injection channel set on the door (1). After maintaining the pressure for a set time, the pressure change is observed. If the pressure remains stable or the drop is within the allowable range, the overall air tightness of the door (1) is qualified. Sealing strip installation: Install the sealing strip (18) into the sealing strip installation groove (17) on the side frame aluminum profile. After the sealing strip (18) is installed, it covers the weld between the panel and the side frame aluminum profile and covers the injection nozzle (24) and the air pressure detection hole (26).

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