Steel heat insulation fireproof door

Abstract

The invention discloses a steel heat insulation fireproof door which comprises a door frame and a steel door plate, the steel door plate is hinged to the door frame, door handles are rotationally connected to the two sides of the steel door plate, and the steel heat insulation fireproof door further comprises a driving assembly, a first linkage assembly, a second linkage assembly, a first sealing plate and a second sealing plate; through the arrangement of the driving assembly, the two first linkage assemblies and the second linkage assembly, the driving assembly can synchronously drive the two first sealing plates and the two second sealing plates to move towards the interior of the containing groove at the same time, and sealing strips arranged on the first sealing plates and the second sealing plates are further driven to retract into the fireproof door at the same time. The problem that the sealing strip is abraded in daily door opening and closing can be effectively solved. Meanwhile, through cooperation of the door closer and the reset assembly, the fireproof door can be automatically closed after being opened, the sealing strip extends out of the containing groove and abuts against the door frame after the fireproof door is closed, and the sealing strip is always sealed between the fireproof door and the door frame in the closed state.

Description

Technical Field

[0001] The invention relates to the technical field of fireproof doors, and in particular to a steel heat-insulating fireproof door. Background Art

[0002] Fire doors are special doors designed to form fire separations inside buildings. Fire doors can meet the requirements of fire resistance stability, integrity and thermal insulation for a certain period of time. When a fire occurs, fire doors can maintain structural integrity and not collapse. At the same time, they isolate flames, high temperatures and smoke, thereby effectively preventing the spread of fire. Fire doors are usually installed in key locations such as fire compartments, evacuation stairwells, vertical shafts, etc. to separate different fire zones and ensure that fire does not spread from one area to another.

[0003] Existing steel heat-insulating fire doors usually have sealing strips fixedly installed on the door frame or fire door to fill the gap between the door frame and the door leaf to ensure the sealing performance of the door, thereby reducing the spread of fire and smoke during a fire, and effectively preventing smoke, toxic gases and hot gases from escaping through the door gap to protect the lives of personnel. However, the sealing strips fixedly installed on the door frame and fire door will be worn due to human trampling or frequent opening and closing of the door. Once the sealing strips are worn, their sealing performance will be greatly reduced, resulting in the fire door being unable to effectively isolate flames, smoke and toxic gases during a fire, which will not only aggravate the spread of the fire, but also hinder the evacuation of personnel.

[0004] The utility model patent with application number 202410191901.7 discloses an induction insulated steel fire door, including a door frame and a door panel, the door panel is installed on the door frame, and a handle is installed on the door panel; a receiving groove is provided at the bottom of the door panel, a hook is rotatably arranged inside the receiving groove, a first torsion spring is arranged at the hinge of the hook, and the hook is made of memory metal with a transformation temperature of 40℃~50℃, a sliding rod is vertically slidably installed inside the receiving groove, a bent hook portion is arranged on the top of the sliding rod, a connecting plate is horizontally installed at the bottom of the sliding rod, a sealing strip is fixedly installed at the bottom of the connecting plate, and a spring is arranged on the sliding rod.

[0005] The fire door of the above invention can hook the sealing strip at the bottom of the door panel through the hook supported by the memory metal to prevent the sealing strip from wearing against the door frame during normal use in non-fire situations, thereby ensuring the service life and use effect of the sealing strip. At the same time, it also prevents the sealing strip from affecting the opening and closing of the fire door in daily non-fire situations. However, in the early stage of a fire, when the temperature near the fire door does not reach 40°C, the sealing strip will not extend from the receiving groove to seal the gap between the door panel and the door frame. Due to untimely sealing, harmful gases such as smoke and dust are more likely to overflow the fire door during this period, thereby affecting the health and safety of people on the other side of the fire door.

[0006] Therefore, it is necessary to develop a steel heat-insulating fireproof door for the above-mentioned defects. Summary of the invention

[0007] The purpose of the present invention is to provide a steel heat-insulating fire door, which can open the fire door by turning the handle, and at the same time, the sealing strips arranged around the door panel of the fire door can be retracted into the fire door. After the fire door is closed, the sealing strips extend out of the fire door and abut against the door frame to seal the door gap. It can avoid the sealing strips from being worn out during daily door opening and closing, and ensure that the fire door is always sealed with the door frame in the closed state.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention discloses a steel heat-insulating fireproof door, comprising a door frame and a steel door panel, wherein the steel door panel is hinged on the door frame, and door handles are rotatably connected to both sides of the steel door panel, and further comprising a driving assembly, a first linkage assembly, a second linkage assembly, a first sealing plate and a second sealing plate;

[0010] The driving assembly includes a first gear rotatably connected to the inner wall of the steel door panel, the first gear is coaxially fixedly connected to the door handle, a rotating column is fixedly connected to the circumference of the surface of the first gear, the outer wall of the rotating column is rotatably connected to a pull rod, and the pull rod is fixedly connected to a connecting plate at one end away from the first gear; two mounting seats are fixedly connected to the inner cavity of the steel door panel, and a first sliding block slidably connected to the inner wall of the steel door panel is arranged between the two mounting seats, and both ends of the first sliding block are fixedly connected to a sliding rod, and the two ends of the two sliding rods respectively pass through the two mounting seats and are slidably connected thereto; one end of the two sliding rods is fixedly connected to the connecting plate, and the other end of the sliding rod is fixedly connected to the first connecting rod; the number of the first linkage components is two groups and they are respectively arranged at the top and bottom of the first sliding block, and the two first linkage components are one The two ends are connected to the second connecting rod, and the other ends of the two first linkage components are transmission-connected to the driving component; the second linkage component is connected to the third connecting rod and is transmission-connected to the driving component; the two sides, top surface and bottom surface of the steel door panel are provided with accommodating grooves, and there are two first sealing plates and two second sealing plates, and the two first sealing plates and the two second sealing plates are respectively arranged in the accommodating grooves of the steel door panel in a one-to-one correspondence; the two first sealing plates are respectively fixedly connected to the two second connecting rods, and the two second sealing plates are respectively connected to the first connecting rod and the third connecting rod; the outer sides of the first sealing plates and the second sealing plates are detachably connected with sealing strips; the door closers are fixedly installed on the door frame and the steel door panel, and a reset component is arranged between the first slider and the mounting seat.

[0011] Furthermore, the first linkage components are in two groups and are symmetrically arranged at the top and bottom of the first slider, the first linkage components include an L-shaped connecting rod rotatably connected to the inner wall of the steel door panel, the top and bottom surfaces of the first slider are fixedly connected to mounting blocks, the mounting block is fixedly connected to a first sliding column, one end of the L-shaped connecting rod is provided with a first strip sliding groove that slidably cooperates with the first sliding column; the other end of the L-shaped connecting rod is provided with a second strip sliding groove, a second sliding column is slidably connected in the second strip sliding groove, and the second sliding column is fixedly connected to the second connecting rod.

[0012] Furthermore, the second linkage assembly includes a first guide rail arranged above the first gear, the first guide rail is horizontally fixedly connected to the inner wall of the steel door panel, a second slider is slidably connected to the first guide rail, the bottom surface of the second slider is fixedly connected to a first rack meshing with the first gear, and the top surface of the second slider is fixedly connected to the third connecting rod.

[0013] Furthermore, a second gear meshing with the first gear is rotatably connected to the inner wall of the steel door panel below the first gear; a horizontally arranged second guide rail is fixedly connected to the inner wall of the steel door panel below the second gear, a third slider is slidably connected to the second guide rail, a second rack meshing with the second gear is fixedly connected to the top surface of the third slider, a fourth connecting rod is fixedly connected to the bottom surface of the third slider, and the fourth connecting rod is fixedly connected to the second sealing plate.

[0014] Furthermore, the reset assembly includes two compression springs and a one-way damper, the two compression springs are respectively mounted on the outer walls of the two sliding rods between the mounting seat close to the first gear and the first slider, one end of the two compression springs is fixedly connected to the mounting seat, and the other end is fixedly connected to the first slider; the two ends of the one-way damper are respectively fixedly connected to the first slider and the mounting seat.

[0015] Furthermore, the outer sides of the first sealing plate and the second sealing plate are provided with installation grooves, and the installation strips are detachably connected in the installation grooves, and the first magnetic blocks are fixedly connected at both ends of the installation strips, and the second magnetic blocks with opposite magnetic properties to the first magnetic blocks are fixedly connected at both ends of the installation grooves; the sealing strips are adhered to the installation strips.

[0016] Furthermore, a filling cavity is provided inside the first sealing plate and the second sealing plate, and the filling cavity is filled with solid flame retardant particles. A plurality of air holes are provided on both sides of the bottom surface of the installation groove, and the air holes are connected to the filling cavity.

[0017] Furthermore, both ends of the outer side surfaces of the first sealing plate and the second sealing plate are fixedly connected with plug-in columns, and the side walls of the door frame are provided with plug-in holes adapted to the plug-in columns.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are:

[0019] 1. The present invention, through the arrangement of the door handle and the driving assembly, drives the first gear of the driving assembly to rotate by pressing down and rotating the door handle, drives the first slider to move linearly in the direction close to the first gear through the pull rod and the slide rod, drives the first connecting rod and the second sealing plate fixedly connected thereto to move with the first slider through the fixed connection between the slide rod and the first connecting rod; through the arrangement of the two first linkage assemblies and the second linkage assemblies, it is possible to realize that the driving assembly synchronously drives the two first sealing plates and the second sealing plates to move into the receiving groove at the same time, and further drives the sealing strips arranged on the first sealing plate and the second sealing plate to be retracted into the fire door at the same time. It can effectively avoid the problem of the sealing strip being worn in daily door opening and closing. At the same time, through the cooperation of the door closer and the reset assembly, it can realize that the fire door is automatically closed after opening, and after the fire door is closed, the sealing strip extends out of the receiving groove and contacts the door frame, so that the fire door is always sealed with a sealing strip between the door frame in the closed state.

[0020] 2. The present invention arranges a first magnetic block and a second magnetic block with opposite magnetic properties at both ends of the mounting strip and the mounting groove, respectively. The attraction between the first magnetic block and the second magnetic block facilitates quick disassembly and assembly of the mounting strip in the mounting groove. The sealing strip is adhered and fixed to the mounting strip, which facilitates disassembly, assembly and replacement of the sealing strip.

[0021] 3. The present invention fills fixed flame retardant particles in the filling cavity in the first sealing plate and the second sealing plate. When a fire occurs, the fixed flame retardant particles are decomposed by heat to produce non-combustible gases, such as carbon dioxide and nitrogen, which diffuse through the air holes to the steel door panel and the door frame, dilute the concentration of oxygen nearby, prevent the continuation of combustion, and further improve the heat insulation and flame retardant properties of the fire door.

[0022] 4. The present invention provides plug-in posts on the first sealing plate and the second sealing plate. When the fire door is closed, the plug-in posts can be plugged into the plug-in holes of the door frame, thereby enhancing the connection strength between the steel door panel and the door frame. In the event of a fire, the fire door's pressure resistance can be enhanced to prevent the door panel from deforming or falling off due to high temperature or pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the steel heat-insulating fire door of the present invention;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the steel door panel of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure inside the steel door panel of the present invention;

[0027] Figure 4 for Figure 3 A partial enlarged view of part A;

[0028] Figure 5 It is a partial three-dimensional structural schematic diagram of the driving assembly and the first linkage assembly of the present invention;

[0029] Figure 6 It is a partial three-dimensional structural schematic diagram of the driving assembly and the second linkage assembly of the present invention;

[0030] Figure 7 is a schematic diagram of the three-dimensional structure of the first sealing plate of the present invention;

[0031] Figure 8 is a cross-sectional view of a first sealing plate of the present invention;

[0032] Fig. 9 for Figure 8 A partial enlarged view of part A;

[0033] Fig.10 It is a schematic diagram of the three-dimensional structure of the door frame of the present invention.

[0034] Description of reference numerals: 1, door frame; 2, steel door panel; 3, door handle; 4, first gear; 5, rotating column; 6, pull rod; 7, connecting plate; 8, mounting seat; 9, first slider; 10, slide rod; 11, first connecting rod; 12, mounting block; 13, first slide column; 14, second connecting rod; 15, first strip sliding groove; 16, L-shaped connecting rod; 17, second strip sliding groove; 18, second slide column; 19, first guide rail; 20, second slider; 21, first rack; 22, third connecting rod Connecting rod; 23, first sealing plate; 24, second sealing plate; 25, receiving groove; 26, sealing strip; 27, door closer; 28, second gear; 29, second guide rail; 30, third slider; 31, second rack; 32, fourth connecting rod; 33, compression spring; 34, one-way damper; 35, mounting groove; 36, mounting strip; 37, first magnetic block; 38, second magnetic block; 39, filling cavity; 40, solid flame retardant particles; 41, air vent; 42, plug-in column; 43, plug-in hole. DETAILED DESCRIPTION

[0035] The core of the present invention is to provide a steel heat-insulating fire door, which can open the fire door by turning the handle, and at the same time, the sealing strips arranged around the door panel of the fire door can be retracted into the fire door. After the fire door is closed, the sealing strips extend out of the fire door and abut against the door frame to seal the door gap. It can prevent the sealing strips from being worn out during daily door opening and closing, and ensure that the fire door is always sealed with the door frame in the closed state.

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In a specific embodiment of the present invention, Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, it includes a door frame 1 and a steel door panel 2, the steel door panel 2 is hinged on the door frame 1, and the two sides of the steel door panel 2 are rotatably connected with door handles 3. It is characterized in that it also includes a driving assembly, a first linkage assembly, a second linkage assembly, a first sealing plate 23 and a second sealing plate 24. The driving assembly includes a first gear 4 rotatably connected to the inner wall of the steel door panel 2, the first gear 4 is coaxially fixedly connected to the door handle 3, a rotating column 5 is fixedly connected to the circumference of the surface of the first gear 4, and a pull rod 6 is rotatably connected to the outer wall of the rotating column 5, and a connecting plate 7 is fixedly connected to the end of the pull rod 6 away from the first gear 4. Two mounting seats 8 are fixedly connected in the inner cavity of the steel door panel 2, and a first slider 9 is provided between the two mounting seats 8 and is slidably connected to the inner wall of the steel door panel 2. Both ends of the first slider 9 are fixedly connected to sliding rods 10, and the two ends of the two sliding rods 10 respectively penetrate the two mounting seats 8 and are slidably connected thereto; one end of the two sliding rods 10 is fixedly connected to the connecting plate 7, and the other end of the sliding rod 10 is fixedly connected to the first connecting rod 11. There are two groups of first linkage components, which are respectively arranged at the top and bottom of the first slider 9. One end of the two first linkage components is connected to the second connecting rod 14, and the other end of the two first linkage components is connected to the driving component. The second linkage component is connected to the third connecting rod 22 and is connected to the driving component. The steel door panel 2 is provided with receiving grooves 25 on both sides, the top surface and the bottom surface. The number of the first sealing plate 23 and the second sealing plate 24 is two, and the two first sealing plates 23 and the two second sealing plates 24 are respectively arranged in the receiving grooves 25 of the steel door panel 2. The two first sealing plates 23 are respectively fixedly connected to the two second connecting rods 14, and the two second sealing plates 24 are respectively connected to the first connecting rod 11 and the third connecting rod 22. The outer surfaces of the first sealing plates 23 and the second sealing plates 24 are both detachably connected with sealing strips 26. The door frame 1 and the steel door panel 2 are fixedly installed with a door closer 27, and a reset component is arranged between the first slider 9 and the mounting seat 8.

[0039] By pressing down and rotating the door handle 3, the first gear 4 of the driving assembly is driven to rotate, and the first slider 9 is driven to move linearly toward the first gear 4 through the pull rod 6 and the slide rod 10. Through the fixed connection between the slide rod 10 and the first connecting rod 11, the first connecting rod 11 and the second sealing plate 24 fixedly connected thereto are driven to move with the first slider 9; through the arrangement of the two first linkage assemblies and the second linkage assemblies, the driving assembly can synchronously drive the two first sealing plates 23 and the second sealing plates 24 to move into the receiving groove 25 at the same time, and further drive the sealing strips 26 arranged on the first sealing plates 23 and the second sealing plates 24 to be retracted into the fire door at the same time. The problem of the sealing strip 26 being worn in daily door opening and closing can be effectively avoided. At the same time, through the cooperation of the door closer 27 and the reset assembly, the fire door can be automatically closed after opening, and after the fire door is closed, the sealing strip 26 extends out of the receiving groove 25 and contacts the door frame 1, so that the fire door is always sealed with the sealing strip 26 between the door frame 1 in the closed state.

[0040] In a specific embodiment of the present invention, Figure 3 , Figure 4 and Figure 5 As shown, there are two groups of first linkage components and they are symmetrically arranged at the top and bottom of the first slider 9. The first linkage components include an L-shaped connecting rod 16 rotatably connected to the inner wall of the steel door panel 2. The top and bottom surfaces of the first slider 9 are fixedly connected to the mounting block 12, and the mounting block 12 is fixedly connected to the first sliding column 13. One end of the L-shaped connecting rod 16 is provided with a first strip sliding groove 15 that is slidably matched with the first sliding column 13. The other end of the L-shaped connecting rod 16 is provided with a second strip sliding groove 17, and the second sliding column 18 is slidably connected in the second strip sliding groove 17. The second sliding column 18 is fixedly connected to the second connecting rod 14. The bottom and top of the second connecting rod 14 are provided with a slide cylinder (not shown in the figure) for guiding it in the vertical direction, and the slide cylinder is fixed to the inner wall of the steel door panel 2.

[0041] By pressing and turning the door handle 3, the first slider 9 is driven to move linearly toward the first gear 4. The first slider 9 moves, driving the two mounting blocks 12 and the first slide post 13 to move, so that the first slide post 13 slides in the first strip sliding groove 15, and at the same time drives the L-shaped connecting rod 16 to rotate, and the other end of the L-shaped connecting rod 16 drives the second connecting rod 14 to move in the vertical direction toward the first slider 9. Thus, the first sealing plate 23 connected with the two second connecting rods 14 is driven to move in the receiving groove 25, so that the sealing strips 26 on the two first sealing plates 23 move into the receiving groove 25.

[0042] In a specific embodiment of the present invention, Figure 3 and Figure 6 As shown, the second linkage assembly includes a first guide rail 19 arranged above the first gear 4, the first guide rail 19 is horizontally fixedly connected to the inner wall of the steel door panel 2, a second slider 20 is slidably connected to the first guide rail 19, the bottom surface of the second slider 20 is fixedly connected to a first rack 21 meshing with the first gear 4, and the top surface of the second slider 20 is fixedly connected to the third connecting rod 22.

[0043] The first gear 4 is driven to rotate by pressing and turning the door handle 3, which drives the first rack 21 meshing therewith to move, and then drives the second slider 20 to move on the first guide rail 19. The third connecting rod 22 connected to the second slider 20 is further driven to move. Thus, the second sealing plate 24 connected to the third connecting rod 22 is driven to move in the receiving groove 25, so that the sealing strip 26 on the second sealing plate 24 moves into the receiving groove 25.

[0044] In a specific embodiment of the present invention, Figure 3 and Figure 6As shown, a second gear 28 meshing with the first gear 4 is rotatably connected to the inner wall of the steel door panel 2 below the first gear 4. A horizontally arranged second guide rail 29 is fixedly connected to the inner wall of the steel door panel 2 below the second gear 28, a third slider 30 is slidably connected to the second guide rail 29, a second rack 31 meshing with the second gear 28 is fixedly connected to the top surface of the third slider 30, a fourth connecting rod 32 is fixedly connected to the bottom surface of the third slider 30, and the fourth connecting rod 32 is fixedly connected to the second sealing plate 24.

[0045] By pressing down and turning the door handle 3, the first gear 4 is driven to rotate, which in turn drives the second gear 28 meshing therewith to rotate, and further drives the second rack 31 meshing with the second gear 28 to move, so that the fourth connecting rod 32 and the third connecting rod 22 move synchronously, and can simultaneously apply tension to both ends of the second sealing plate 24, so that the second sealing plate 24 is easier to move in the accommodating groove 25.

[0046] In a specific embodiment of the present invention, Figure 3 and Figure 5 As shown, the reset assembly includes two compression springs 33 and a one-way damper 34. The two compression springs 33 are respectively sleeved on the outer walls of the two slide bars 10 between the mounting seat 8 and the first slider 9 near the first gear 4. One end of the two compression springs 33 is fixedly connected to the mounting seat 8, and the other end is fixedly connected to the first slider 9. Both ends of the one-way damper 34 are respectively fixedly connected to the first slider 9 and the mounting seat 8.

[0047] By setting two compression springs 33, when opening the door, the first slider 9 is moved by pressing and rotating the door handle 3, and the compression spring 33 is squeezed at the same time. After the pedestrian passes through the fire door, the steel door panel 2 is automatically closed under the action of the closer 27. After the steel door panel 2 is closed, the first slider 9 is driven to move to the initial position under the action of the restoring force of the compression spring 33, so that the sealing strips 26 at various positions of the steel door panel 2 are re-extended from the receiving groove 25 and abut against the door frame. By setting the one-way damper 34, no resistance can be provided when compressing the compression spring 33, avoiding the effort of turning the door handle 3. Resistance is only provided when the compression spring 33 is restored, which can delay the recovery speed of the compression spring 33, so that after the steel door panel 2 is closed, the compression spring 33 slowly returns to the original position, and then the sealing strip 26 slowly extends out of the receiving groove 25 and abuts against the door frame, avoiding that the compression spring 33 recovers too quickly during the door closing process, so that the sealing strip 26 extends out of the receiving groove 25 and affects the closing of the steel door panel 2.

[0048] In a specific embodiment of the present invention, Figure 7 , Figure 8 and Fig. 9As shown, the outer side surfaces of the first sealing plate 23 and the second sealing plate 24 are both provided with mounting grooves 35, and mounting strips 36 are detachably connected in the mounting grooves 35, and first magnetic blocks 37 are fixedly connected at both ends of the mounting strips 36, and second magnetic blocks 38 having opposite magnetic properties to the first magnetic blocks 37 are fixedly connected at both ends of the mounting grooves 35. The sealing strip 26 is pasted on the mounting strips 36.

[0049] The attraction between the first magnetic block 37 and the second magnetic block 38 facilitates the quick disassembly and assembly of the mounting strip 36 in the mounting groove 35, and the disassembly and assembly of the sealing strip 26 can be further facilitated by gluing and fixing the sealing strip 26 on the mounting strip 36. It should be noted that a fireproof expansion sealing strip (not shown in the figure) is fixedly glued to the bottom surface of the mounting strip 36 and the inner bottom surface of the mounting groove 35, so that when the mounting strip 36 is installed in the mounting groove 35, a relative seal between the mounting strip 36 and the mounting groove 35 can be achieved.

[0050] In a specific embodiment of the present invention, Figure 7 , Figure 8 and Fig. 9 As shown, a filling cavity 39 is opened inside the first sealing plate 23 and the second sealing plate 24 , and the filling cavity 39 is filled with solid flame retardant particles 40 . A plurality of air holes 41 are opened on both sides of the bottom surface of the installation groove 35 , and the air holes 41 are connected to the filling cavity 39 .

[0051] By filling the fixed flame retardant particles 40 in the filling cavity 39 in the first sealing plate 23 and the second sealing plate 24, when a fire occurs, the fixed flame retardant particles 40 can be heated to decompose non-combustible gases, such as carbon dioxide, nitrogen, etc., which diffuse to the steel door panel 2 and the door frame 1 through the air holes 41, dilute the concentration of nearby oxygen, prevent the combustion from continuing, and further improve the heat insulation and flame retardant performance of the fire door. It should be noted that the size of the air holes 41 is smaller than the size of the solid flame retardant particles 40, so as to prevent the solid flame retardant particles 40 from flowing out of the air holes 41. At the same time, a partition (not shown in the figure) is arranged in the filling cavity 39 along its length direction, and the partition divides the filling cavity 39 into two non-interconnected parts. The air holes 41 on both sides of the inner bottom surface of the mounting groove 35 are respectively located on both sides of the partition, so as to prevent smoke from flowing from the air holes 41 on one side of the inner bottom surface through the filling cavity 39 to the air holes 41 on the other side when a fire occurs.

[0052] In a specific embodiment of the present invention, Figure 7 and Fig.10 As shown, both ends of the outer sides of the first sealing plate 23 and the second sealing plate 24 are fixedly connected with plug-in columns 42 , and the side wall of the door frame 1 is provided with plug-in holes 43 adapted to the plug-in columns 42 .

[0053] Through the cooperation between the plug-in column 42 and the plug-in hole 43, when the fire door is closed, the plug-in column 42 can be plugged into the plug-in hole 43 of the door frame 1, thereby enhancing the connection strength between the steel door panel 2 and the door frame 1. In the event of a fire, the fire door's pressure resistance can be enhanced to prevent the door panel from being deformed or falling off due to high temperature or pressure.

[0054] Working principle of the present invention: When the steel fire door of the present invention is used, the sealing strip 26 contacts the door frame 1 when the fire door is closed. When the fire door is opened, the first gear 4 is driven to rotate by pressing down the door handle 3, and the first slider 9 is driven to move linearly toward the first gear 4 through the pull rod 6 and the slide bar 10, and the first slider 9 squeezes the compression spring 33. The first connecting rod 11 and the second sealing plate 24 fixedly connected thereto are driven to move with the first slider 9, so that the sealing strip 26 on the second sealing plate 24 connected to the first connecting rod 11 moves into the receiving groove 25.

[0055] The movement of the first slider 9 drives the two mounting blocks 12 and the first slide post 13 to move, so that the first slide post 13 slides in the first strip sliding groove 15, and drives the L-shaped connecting rod 16 to rotate, and the other end of the L-shaped connecting rod 16 drives the second connecting rod 14 to move in the vertical direction toward the first slider 9. Thus, the first sealing plate 23 connected with the two second connecting rods 14 is driven to move in the receiving groove 25, so that the sealing strips 26 on the two first sealing plates 23 move into the receiving groove 25.

[0056] The rotation of the first gear 4 drives the first rack 21 meshed therewith to move, thereby driving the second slider 20 to move on the first guide rail 19. The third connecting rod 22 connected to the second slider 20 is further driven to move. Thus, the second sealing plate 24 connected to the third connecting rod 22 is driven to move in the receiving groove 25, so that the sealing strip 26 on the second sealing plate 24 moves into the receiving groove 25.

[0057] By pressing and turning the door handle 3, the sealing strips 26 on the top, bottom and both sides of the steel door panel 2 can be driven to move into the receiving groove 25, so that the sealing strips 26 will not contact and wear the door frame 1 during the door opening process.

[0058] After a pedestrian passes through the fire door and releases the door handle 2, the compression spring 33 slowly recovers under the action of the one-way damper 34. At the same time, under the action of the closer 27, the steel door panel 2 closes quickly and automatically. After the steel door panel 2 is closed, the compression spring 33 slowly returns to its original position, thereby causing the sealing strip 26 to slowly extend out of the receiving groove 25 and contact the door frame again.

[0059] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0060] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A steel heat-insulating fireproof door, comprising a door frame (1) and a steel door panel (2), wherein the steel door panel (2) is hinged on the door frame (1), and door handles (3) are rotatably connected on both sides of the steel door panel (2), characterized in that: It also includes a driving assembly, a first linkage assembly, a second linkage assembly, a first sealing plate (23) and a second sealing plate (24); The driving assembly comprises a first gear (4) rotatably connected to the inner wall of the steel door panel (2), the first gear (4) being coaxially fixedly connected to the door handle (3), a rotating column (5) being fixedly connected to the circumference of the surface of the first gear (4), a pull rod (6) being rotatably connected to the outer wall of the rotating column (5), and a connecting plate (7) being fixedly connected to one end of the pull rod (6) away from the first gear (4); two mounting seats (8) being fixedly connected to the inner cavity of the steel door panel (2), and a connecting plate (7) being provided between the two mounting seats (8) and the door handle (3). The first sliding block (9) is slidably connected to the inner wall of the steel door panel (2), and both ends of the first sliding block (9) are fixedly connected to sliding rods (10), and both ends of the two sliding rods (10) respectively penetrate the two mounting seats (8) and are slidably connected thereto; one end of the two sliding rods (10) is fixedly connected to the connecting plate (7), and the other end of the sliding rods (10) is fixedly connected to the first connecting rod (11); the number of the first linkage components is two groups and they are respectively arranged at the top and bottom of the first sliding block (9), and one end of the two first linkage components is connected to A second connecting rod (14) is connected, and the other ends of the two first linkage components are transmission-connected to the driving component; the second linkage component is connected to a third connecting rod (22) and is transmission-connected to the driving component; both sides, the top surface and the bottom surface of the steel door panel (2) are provided with receiving grooves (25), and the number of the first sealing plates (23) and the second sealing plates (24) are both two, and the two first sealing plates (23) and the two second sealing plates (24) are respectively and one-to-one arranged in the receiving grooves ( 25); the two first sealing plates (23) are respectively fixedly connected to the two second connecting rods (14), and the two second sealing plates (24) are respectively connected to the first connecting rod (11) and the third connecting rod (22); the first sealing plates (23) and the second sealing plates (24) are both detachably connected with sealing strips (26) on their outer surfaces; the door frame (1) and the steel door panel (2) are fixedly mounted with a door closer (27), and a reset assembly is provided between the first slider (9) and the mounting seat (8).

2. The steel heat-insulating fireproof door according to claim 1, characterized in that: The first linkage components are in two groups and are symmetrically arranged at the top and bottom of the first slider (9). The first linkage components include an L-shaped connecting rod (16) rotatably connected to the inner wall of the steel door panel (2). The top and bottom surfaces of the first slider (9) are fixedly connected to mounting blocks (12), and the mounting blocks (12) are fixedly connected to a first sliding column (13). One end of the L-shaped connecting rod (16) is provided with a first strip sliding groove (15) that slidably cooperates with the first sliding column (13); the other end of the L-shaped connecting rod (16) is provided with a second strip sliding groove (17), and a second sliding column (18) is slidably connected in the second strip sliding groove (17), and the second sliding column (18) is fixedly connected to the second connecting rod (14).

3. The steel heat-insulating fireproof door according to claim 1, characterized in that: The second linkage assembly comprises a first guide rail (19) arranged above the first gear (4); the first guide rail (19) is horizontally fixedly connected to the inner wall of the steel door panel (2); a second slider (20) is slidably connected to the first guide rail (19); a first rack (21) meshing with the first gear (4) is fixedly connected to the bottom surface of the second slider (20); and a top surface of the second slider (20) is fixedly connected to the third connecting rod (22).

4. The steel heat-insulating fireproof door according to claim 3, characterized in that: A second gear (28) meshing with the first gear (4) is rotatably connected to the inner wall of the steel door panel (2) below the first gear (4); a horizontally arranged second guide rail (29) is fixedly connected to the inner wall of the steel door panel (2) below the second gear (28), a third slider (30) is slidably connected to the second guide rail (29), a second rack (31) meshing with the second gear (28) is fixedly connected to the top surface of the third slider (30), a fourth connecting rod (32) is fixedly connected to the bottom surface of the third slider (30), and the fourth connecting rod (32) is fixedly connected to the second sealing plate (24).

5. The steel heat-insulating fireproof door according to claim 1, characterized in that: The reset assembly comprises two compression springs (33) and a one-way damper (34); the two compression springs (33) are respectively sleeved on the outer walls of the two slide bars (10) between the mounting seat (8) and the first slider (9) near the first gear (4); one end of the two compression springs (33) is fixedly connected to the mounting seat (8), and the other end is fixedly connected to the first slider (9); the two ends of the one-way damper (34) are respectively fixedly connected to the first slider (9) and the mounting seat (8).

6. The steel heat-insulating fireproof door according to claim 1, characterized in that: The first sealing plate (23) and the second sealing plate (24) are both provided with mounting grooves (35) on their outer sides, a mounting strip (36) is detachably connected in the mounting groove (35), both ends of the mounting strip (36) are fixedly connected with a first magnetic block (37), and both ends of the mounting groove (35) are fixedly connected with a second magnetic block (38) having opposite magnetic properties to the first magnetic block (37); the sealing strip (26) is adhered to the mounting strip (36).

7. The steel heat-insulating fireproof door according to claim 6, characterized in that: A filling cavity (39) is provided inside the first sealing plate (23) and the second sealing plate (24), and the filling cavity (39) is filled with solid flame retardant particles (40). A plurality of air holes (41) are provided on both sides of the inner bottom surface of the installation groove (35), and the air holes (41) are connected to the filling cavity (39).

8. The steel heat-insulating fireproof door according to claim 1, characterized in that: Both ends of the outer side surfaces of the first sealing plate (23) and the second sealing plate (24) are fixedly connected with plug-in columns (42), and the side wall of the door frame (1) is provided with plug-in holes (43) adapted to the plug-in columns (42).

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