A door reinforcement device for an aluminum-wood composite fire door

Abstract

This utility model discloses a door reinforcement device for an aluminum-wood composite fire door, specifically relating to the field of fire door technology. It includes a door frame and a door leaf. The door leaf is composed of an outer aluminum profile layer and an inner solid wood layer. The inner surface of the aluminum profile layer has evenly distributed dovetail-shaped grooves, and the solid wood layer has corresponding protruding structures. Metal connecting components are spaced apart at the aluminum-wood interface. Each metal connecting component includes a metal connecting rod penetrating the aluminum-wood interface and expansion fasteners at both ends. This door reinforcement device for an aluminum-wood composite fire door, through the mechanical connection of the dovetail-shaped grooves and protruding structures, the bonding of the fire-retardant adhesive layer, and the fastening of the metal connecting components, forms a multi-layered connection structure. This significantly improves the connection strength between the aluminum profile layer and the solid wood layer, ensuring that the door leaf will not delaminate or detach during long-term use.

Description

Technical Field

[0001] This utility model relates to the field of fire door technology, and in particular to a door reinforcement device for an aluminum-wood composite fire door. Background Technology

[0002] In the field of modern architecture, fire doors are key facilities for ensuring fire safety, and their performance is directly related to the safety of people's lives and property. Aluminum-wood composite fire doors, with their combination of the aesthetic appeal of wood and the fire resistance and corrosion resistance of aluminum, are gradually becoming the mainstream choice for high-rise buildings, commercial complexes and other places.

[0003] In the high-temperature environment of a fire, aluminum-wood composite fire doors face severe challenges. The main components of wood are cellulose, hemicellulose, and lignin. These organic components undergo complex physical and chemical changes under high temperatures. When the ambient temperature reaches 150℃-200℃, the moisture in the wood evaporates rapidly, causing the wood to shrink and crack. If the temperature continues to rise to 300℃-400℃, the wood begins to pyrolyze, generating combustible gases and charcoal. Its mechanical strength drops sharply, and the wood parts that could originally withstand a certain amount of external force become brittle and unable to maintain the original shape and structural support of the door under high temperatures.

[0004] The aluminum-wood joint is usually fixed using adhesives or mechanical connections. High temperatures can cause the organic components in the adhesive to decompose and carbonize, leading to a significant reduction in bond strength. Mechanical connectors such as screws and rivets, due to the difference in thermal expansion coefficients between metal and wood at high temperatures, will generate greater internal stress, causing the connectors to loosen or even detach. This loss of stability at the aluminum-wood joint results in cracks and separation in the door, compromising its integrity.

[0005] Once the door is damaged, flames and high-temperature smoke can easily break through the defenses and spread rapidly to other areas, not only accelerating the spread of the fire but also causing a large amount of toxic smoke to permeate the area, seriously threatening the lives of trapped personnel. Utility Model Content

[0006] The main purpose of this utility model is to provide a door reinforcement device for aluminum-wood composite fireproof doors, which can effectively solve the problems mentioned above.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A door reinforcement device for an aluminum-wood composite fire door includes a door frame and a door leaf. The door leaf is composed of an outer aluminum profile layer and an inner solid wood layer. A fireproof adhesive layer is provided between the two panels. The inner surface of the aluminum profile layer has evenly distributed dovetail grooves. The solid wood layer forms a matching protrusion structure at the corresponding position. Metal connecting components are provided at intervals at the aluminum-wood interface. The metal connecting components include a metal connecting rod penetrating the aluminum-wood interface and expansion fasteners at both ends.

[0009] Preferably, the fire-retardant adhesive layer is an inorganic silicate-based fire-retardant adhesive with a thickness of 2-5 mm and a fire resistance temperature of not less than 800℃ after curing.

[0010] Preferably, the metal connecting rod is made of double-threaded stainless steel bolts, and the expansion fasteners at both ends are tapered ceramic expansion sleeves. The expansion coefficient of the ceramic expansion sleeves is 2-3 times greater at 300°C than at room temperature.

[0011] Preferably, the solid wood layer is treated with flame retardant impregnation to form a gradient flame retardant structure, with a phosphorus-nitrogen flame retardant content of ≥28wt% within a 15mm depth of the surface and a flame retardant content of ≥15wt% in the core material.

[0012] Preferably, the aluminum profile layer has a honeycomb cavity structure inside, and the cavity is filled with an expanded graphite composite flame retardant material, which comprises expanded graphite and aluminum silicate fiber mixed in a mass ratio of 3:1.

[0013] Preferably, the metal connecting components are distributed in a quincunx pattern along the height of the door leaf, with a longitudinal spacing of 150-200mm between adjacent components and a lateral spacing of 80-120mm.

[0014] Preferably, the inner side of the door frame is provided with an L-shaped fireproof sealing groove, and an inflatable fireproof sealing strip is embedded in the groove. The sealing strip has an expansion rate of ≥150% at 150°C and an expansion rate of ≥300% at 200°C.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model forms a multi-layered connection structure through the mechanical connection of the dovetail groove and the raised structure, the bonding of the fireproof adhesive layer, and the fastening of the metal connection components. This significantly improves the connection strength between the aluminum profile layer and the solid wood layer, ensuring that the door leaf will not delaminate or fall off during long-term use.

[0017] 2. This utility model improves the fire resistance of fire doors in multiple ways by using inorganic silicate-based fire-retardant adhesive, a gradient flame-retardant treated solid wood layer, and expanded graphite composite flame-retardant material. The fire-retardant adhesive layer forms a fire-resistant layer at high temperatures, preventing heat transfer; the gradient flame-retardant structure of the solid wood layer inhibits flame spread; and the expanded graphite composite flame-retardant material expands and insulates at high temperatures. Together, these factors give the fire door a high fire resistance temperature and a long fire resistance time.

[0018] 3. In this utility model, the conical ceramic expansion sleeve in the metal connection component has an increased expansion coefficient at high temperatures, which can automatically compensate for the material expansion differences caused by temperature rise, maintain the stability of connection strength, and ensure the integrity of the door structure in a fire environment.

[0019] 4. The design of the L-shaped fireproof sealing groove and the expansion fireproof sealing strip on the inner side of the door frame in this utility model improves the sealing performance of the fire door, effectively prevents the leakage of smoke and flames, and buys more time for personnel evacuation and fire fighting. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This utility model Figure 1 Enlarged view of node A in the middle;

[0022] Figure 3 This utility model Figure 1 A magnified view of node B in the middle.

[0023] In the diagram: 1. Door frame; 11. Fireproof sealing groove; 12. Sealing strip; 2. Door leaf; 21. Aluminum profile layer; 211. Dovetail groove; 212. Cavity structure; 213. Composite flame retardant material; 22. Solid wood layer; 221. Raised structure; 23. Fireproof adhesive layer; 3. Metal connecting components; 31. Metal connecting rod; 32. Expansion fastener. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] In this solution, a door reinforcement device for an aluminum-wood composite fireproof door is composed of a door frame structure, a door leaf structure, and metal connecting components.

[0026] Outer aluminum profile layer: Made of aluminum alloy, grade 6063, which has good strength and corrosion resistance. The inner surface of the aluminum profile layer is machined with evenly distributed dovetail grooves, 5mm deep, 8mm wide, and spaced 50mm apart. The interior of the aluminum profile layer has a honeycomb cavity structure with 10mm side length cells. The cavities are filled with expanded graphite composite flame-retardant material, which is a 3:1 mass ratio mixture of expanded graphite and aluminum silicate fiber.

[0027] Inner solid wood layer: Pine wood is selected as the solid wood material and undergoes flame-retardant impregnation treatment. The treatment process involves immersing the pine wood in a solution containing phosphorus and nitrogen-based flame retardants for 2 hours at a pressure of 0.5 MPa and a temperature of 80°C, allowing the flame retardants to penetrate into the wood. After treatment, the phosphorus and nitrogen-based flame retardant content within 15 mm of the solid wood layer surface is 30 wt%, and the core material contains 18 wt%, forming a gradient flame-retardant structure. The solid wood layer has a matching protrusion at the position of the dovetail groove in the aluminum profile layer. The shape of the protrusion matches the dovetail groove, and its height is 5 mm.

[0028] Fire-retardant adhesive layer: Inorganic silicate-based fire-retardant adhesive is used. The fire-retardant adhesive is evenly applied to the bonding surface of the aluminum profile layer and the solid wood layer, with the adhesive layer thickness controlled at 3mm. Then, the aluminum profile layer and the solid wood layer are pressed together and cured for 24 hours under a pressure of 1MPa to ensure a firm bond between the two.

[0029] Metal connection components

[0030] The metal connecting components are arranged in a quincunx pattern along the height of the door leaf, with a longitudinal spacing of 180mm and a transverse spacing of 100mm between adjacent components. The metal connecting rods use 8mm diameter double-threaded stainless steel bolts, the length of which is determined by the thickness of the door leaf to ensure penetration through the aluminum profile layer and the solid wood layer. The expansion fasteners at both ends are tapered ceramic expansion sleeves, with a large end diameter of 12mm, a small end diameter of 8mm, and a length of 20mm. During installation, through holes matching the diameter of the metal connecting rods are first machined into the aluminum profile layer and the solid wood layer. The metal connecting rods are then passed through these holes, and the tapered ceramic expansion sleeves are fitted onto both ends. Tools are used to tighten the expansion sleeves, ensuring a tight bond between the ceramic expansion sleeves and the metal connecting rods, profiles, and wood.

[0031] Door frame structure

[0032] The door frame is made of the same aluminum alloy as the outer aluminum profile layer of the door leaf. The inner side features an L-shaped fireproof sealing groove, 20mm wide and 15mm deep. An intumescent fireproof sealing strip is embedded within the groove. The strip is made of silicone rubber-based material with added expanding agent, exhibiting an expansion rate of 160% at 150℃ and 320% at 200℃. During installation, the intumescent fireproof sealing strip is inserted into the L-shaped fireproof sealing groove, ensuring a tight fit between the strip and the groove.

[0033] The tapered ceramic expansion sleeve of the metal connection assembly expands 2-3 times more at 300℃ than at room temperature. After expansion, it tightly grips the aluminum profile layer and the solid wood layer, compensating for the material expansion differences caused by temperature increases, maintaining the stability of the connection strength, and preventing door leaf delamination. The inflatable fireproof sealing strip on the inside of the door frame begins to expand when the temperature rises to 150℃, and as the temperature rises to 200℃, the expansion rate reaches over 300%, filling the gap between the door frame and the door leaf, preventing smoke and flames from passing through, and improving the sealing performance and fire resistance of the fire door.

[0034] Working principle: When a fire occurs, the temperature rises, and the inorganic silicate-based fire-retardant adhesive in the fire-retardant bonding layer forms a dense fire-retardant layer at high temperatures, preventing heat transfer to the solid wood layer. The solid wood layer undergoes gradient flame-retardant treatment; the high flame-retardant content on the surface quickly inhibits the spread of flames, while the flame-retardant content in the core material ensures that the wood will not burn for a certain period of time. The expanded graphite composite flame-retardant material inside the aluminum profile layer expands at high temperatures, filling the honeycomb cavities to form a heat insulation layer, further preventing heat transfer.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A door body reinforcing device of an aluminum-wood composite fireproof door, comprising a door frame (1) and a door leaf (2), characterized in that: The door panel (2) is composed of an outer aluminum profile layer (21) and an inner solid wood layer (22). A fireproof adhesive layer (23) is provided between the two panels. The inner surface of the aluminum profile layer (21) is provided with evenly distributed dovetail grooves (211). The solid wood layer (22) forms a matching protrusion structure (221) at the corresponding position. Metal connecting components (3) are provided at intervals at the aluminum-wood interface. The metal connecting components (3) include a metal connecting rod (31) that penetrates the aluminum-wood interface and expansion fasteners (32) at both ends.

2. The door reinforcement device for an aluminum-wood composite fire door according to claim 1, characterized in that: The fireproof adhesive layer (23) is an inorganic silicate-based fireproof adhesive with a thickness of 2-5 mm and a fire resistance temperature of not less than 800℃ after curing.

3. The door reinforcement device for an aluminum-wood composite fire door according to claim 1, characterized in that: The metal connecting rod (31) is made of double-threaded stainless steel bolts, and the expansion fasteners (32) at both ends are conical ceramic expansion sleeves. The expansion coefficient of the ceramic expansion sleeves is 2-3 times greater than that at room temperature under high temperature of 300℃.

4. The door reinforcement device for an aluminum-wood composite fire door according to claim 1, characterized in that: The solid wood layer (22) is treated with flame retardant impregnation to form a gradient flame retardant structure, with a phosphorus and nitrogen flame retardant content of ≥28wt% within a 15mm depth of the surface and a core material flame retardant content of ≥15wt%.

5. The door reinforcement device for an aluminum-wood composite fire door according to claim 1, characterized in that: The aluminum profile layer (21) has a honeycomb cavity structure (212) inside, and the cavity is filled with expanded graphite composite flame retardant material (213). The expanded graphite composite flame retardant material (213) contains expanded graphite and aluminum silicate fiber mixed in a mass ratio of 3:

1.

6. The door reinforcement device for an aluminum-wood composite fire door according to claim 1, characterized in that: The metal connecting components (3) are distributed in a plum blossom pattern along the height direction of the door leaf, with a longitudinal spacing of 150-200mm between adjacent components and a transverse spacing of 80-120mm.

7. The door reinforcement device for an aluminum-wood composite fire door according to claim 1, characterized in that: The door frame (1) is provided with an L-shaped fireproof sealing groove (11) on the inner side, and an expansion fireproof sealing strip (12) is embedded in the groove. The sealing strip (12) has an expansion rate of ≥150% at 150℃ and an expansion rate of ≥300% at 200℃.

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