Three-proofing steel door

Abstract

The invention discloses a three-proofing steel door which comprises a door leaf, a door frame and hinges, wherein the door leaf comprises a frame body and an inorganic fire-proofing core plate; the door leaf and the door frame fit together through two overlap joint structures; the first overlap joint structure comprises a first groove and a first bulge; the second overlap joint structure comprises a second bulge and a second groove; when the door leaf stays in a closed state, the whole door leaf is located inside the door frame, and the first bulge and the second bulge are located in the first groove and the second groove respectively; a fire-proofing expansion sealing rubber strip is arranged on the side of the first bulge, which is close to the panel of the door leaf; when the door leaf is closed, the gap between the panel of the door leaf and the first bulge on the door frame is sealed by the fire-proofing expansion sealing rubber strip. The three-proofing steel door has favorable overall strength, a favorable sound insulation effect and a favorable anti-theft effect, and can greatly increase the safety factor of a security door.

Description

technical field [0001] The invention relates to a fireproof door, in particular to a three-proof steel door. Background technique [0002] Steel fire doors are mainly composed of two parts, the door frame and the door leaf. In 2008, the Ministry of Public Security drafted a new version of the standard GB12955-2008 for fire doors. The new standard stipulates that non-degradable fibers should not be used as the fire door core material in the fire door core material. Therefore, Most of the current fire door core materials use perlite board; however, due to the poor bonding strength of perlite board itself, it is easy to disconnect after bonding with the steel plate, and factors such as processing deformation, thermal deformation, and collision deformation of the thin steel plate have always caused problems. The bond with the perlite board is not firm, which directly affects the overall performance of the fire door. [0003] However, when a fire breaks out, the steel fire doo...

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Problems solved by technology

[0002] Steel fire doors are mainly composed of two parts, the door frame and the door leaf. In 2008, the Ministry of Public Security drafted a new version of the standard GB12955-2008 for fire doors. The new standard stipulates that non-degradable fibers should not be used as the fire door core material in the fire door core material. Therefore, Most of the current fire door core materials use perlite board; however, due to the poor bonding strength of perlite board itself, it is easy to disconnect after bonding with the steel plate, and factors such as processing deformation, thermal deformation, and collision deformation of the thin steel plate have always caused problems. The bond with the perlite board is not firm, which directly affects the overall performance of the fire door

[0003] However, when a fire breaks out, the steel fire door frame processed by single-layer steel plate cannot meet the performance requirements of the fire-proof door due to the high thermal conductivity of steel and the rapid temperature rise on the back side; the strength of the single-layer steel plate after processing is weak , the fireproof door frame is easy to deform; the door leaf of the steel fireproof door is made of upper and lower two layers of thin steel plates and perlite boards. The bonding between the steel plate and the perlite board does not meet the requirements for fire doors, and if it is hit by an external force, it is easy to cause the perlite board and the panel to be disconnected, which does not meet the fire protection requirements

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