Fireproof door for prefabricated cabin and prefabricated substation

Abstract

The fireproof door for the prefabricated cabin comprises a door frame and a fireproof door body, the fireproof door body is contained in the door frame, and one side of the fireproof door body is hinged to the door frame; the fireproof door main body comprises a keel frame, a rock wool composite plate and an aluminum alloy plate; a cavity is formed in the keel frame, the cavity of the keel frame is filled with the rock wool composite board, and the outer side of the keel frame and the outer side of the rock wool composite board are wrapped with the aluminum alloy board. The fireproof door for the prefabricated cabin is light, and manual opening and closing are labor-saving.

Description

Technical Field

[0001] This utility model specifically relates to a fireproof door for prefabricated cabins and a prefabricated substation. Background Technology

[0002] In the fields of power generation, transmission, distribution and new energy technology, prefabricated substations, as a new construction model that has emerged in the last ten years or so, have entered a mature stage of development and application. As the main integrated equipment of prefabricated substations, the prefabricated cabins have a very high degree of standardization in their processing and manufacturing processes. Currently, the prefabricated cabins commonly used in the market all adopt the container assembly house scheme, and their processes mainly follow the container manufacturing process with improvements.

[0003] Currently, most prefabricated doors are made of corrugated steel container panels. These panels are made from a single piece of steel, making them quite heavy and difficult to open and close manually. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to address the above-mentioned deficiencies in the prior art by providing a fireproof door for prefabricated cabins, a manufacturing method, and a prefabricated substation. The fireproof door for prefabricated cabins is relatively lightweight and easy to open and close manually.

[0005] According to an embodiment of the first aspect of this utility model, a fireproof door for prefabricated cabins is provided, comprising: a door frame and a fireproof door body, wherein the fireproof door body is accommodated in the door frame and one side of the fireproof door body is hinged to the door frame; the fireproof door body comprises a frame, a rock wool composite panel and an aluminum alloy plate; the frame has a cavity inside, the rock wool composite panel is filled in the cavity of the frame, and the aluminum alloy plate is covered on the outside of the frame and the rock wool composite panel.

[0006] Optionally, the keel includes a first square frame and a second square frame, which are arranged opposite to each other along the thickness direction of the fire door body. A corrugated expansion joint is provided between the first square frame and the second square frame, which is arranged along the thickness direction of the fire door body.

[0007] Optionally, both the first and second square frame frames are square frame frames, each including a first keel rod, a second keel rod, a third keel rod, and a fourth keel rod. The first and second keel rods extend along the length of the door frame and are positioned opposite each other. The third and fourth keel rods extend along the width of the door frame and are positioned opposite each other. The third keel rod is located above the fourth keel rod, and both ends of the third keel rod are welded to the upper ends of the first and second keel rods, respectively. Both ends of the fourth keel rod are welded to the lower ends of the first and second keel rods, respectively.

[0008] Optionally, the door frame includes: a first post, a second post, and a door beam assembly; the first post and the second post are arranged opposite to each other, the door beam is located between the first post and the second post and is connected to the upper ends of the first post and the second post, and one side of the fire door body is hinged to the first post.

[0009] Optionally, both the first and second columns are provided with a wiring cavity extending vertically inside, which is used to lay cables for electrical equipment on the door.

[0010] Optionally, the door beam assembly includes a mounting frame, ventilation louvers, and a filter; the ventilation louvers are mounted on the mounting frame, the filter is mounted on the mounting frame, and the filter is located inside the ventilation louvers.

[0011] Optionally, the door beam assembly also includes: a first mesh panel and a second mesh panel, which are arranged opposite to each other and are respectively installed on the outer and inner sides of the mounting frame. The ventilation louvers and the filter are located between the two mesh panels.

[0012] Optionally, a drainage hole is provided at the lower end of the first mesh panel.

[0013] Optionally, the rock wool composite board is made of aluminum silicate material.

[0014] According to an embodiment of the second aspect of this utility model, a prefabricated substation is provided, comprising: a prefabricated compartment, wherein the compartment door is a fireproof door for prefabricated compartments as described above.

[0015] The fireproof door for prefabricated cabins in this invention is composed of a frame, rock wool composite panels, and aluminum alloy plates. The frame ensures the overall sturdiness of the door panel, and because it is only a skeletal structure, it is lighter than traditional corrugated container doors made from a single piece of steel. Furthermore, the rock wool composite panels are lightweight and possess excellent fireproof and heat insulation properties; filling the frame with rock wool composite panels provides good heat insulation. The aluminum alloy plates are also relatively lightweight, further reducing the overall weight of the fireproof door. Therefore, the overall weight of the fireproof door is significantly reduced while maintaining sufficient strength and meeting the fire resistance requirements for prefabricated cabin fireproof doors.

[0016] In summary, the fire doors used in this prefabricated cabin are relatively lightweight, easy to open and close manually, and have good strength and fireproof and heat insulation performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the inner structure of a fireproof door for a prefabricated cabin in some embodiments of this utility model;

[0018] Figure 2This is a schematic diagram of the outer structure of a fireproof door for a prefabricated cabin in some embodiments of this utility model;

[0019] Figure 3 yes Figure 1 Sectional view at point AA;

[0020] Figure 4 yes Figure 1 Sectional view at point BB;

[0021] Figure 5 This is a schematic diagram of the keel frame structure in some embodiments of this utility model.

[0022] In the diagram: 1. First upright; 2. Second upright; 3. Mounting frame; 4. First mesh panel; 5. Second mesh panel; 6. Hinge; 7. Fire door body (door leaf); 8. Push bar lock; 9. Filter; 10. Ventilation louvers; 11. Aluminum alloy plate; 12. Door post buckle plate; 13. Sealing strip; 14. Rock wool composite board; 15. Keel frame; 151. First square frame frame; 152. Second square frame frame; 153. Corrugated expansion joint. Detailed Implementation

[0023] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper" and "lower" are used interchangeably.

[0025] The terms "upstream" and "downstream" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Example 1

[0029] Please see Figure 1 and Figure 2 This utility model discloses a fireproof door for prefabricated cabins, including: a door frame and a fireproof door body 7.

[0030] The fire door body 7 is housed within the door frame, and one side of the fire door body 7 is hinged to the door frame. The fire door body 7 includes a frame 15, a rock wool composite panel 14, and an aluminum alloy panel 11. The frame 15 has an internal cavity, the rock wool composite panel 14 is filled within the cavity of the frame 15, and the aluminum alloy panel 11 covers the outside of the frame 15 and the rock wool composite panel 14.

[0031] It should be noted that the fire door in this utility model embodiment relates to the fields of power generation, transmission, transformation and distribution technology and new energy technology, and is mainly an aluminum alloy-clad fire door for prefabricated substation cabins.

[0032] In the fields of power generation, transmission, distribution, and new energy technologies, prefabricated substations, as a new construction model that has emerged in the last decade or so, have reached a mature stage of development and application. Prefabricated modules, as the main integrated equipment in prefabricated substations, have a very high degree of standardization in their manufacturing process. Currently, commonly used prefabricated modules on the market adopt a container assembly-style solution, with improvements made to the container manufacturing process. Most prefabricated module doors use corrugated container doors, which are relatively heavy and difficult to open and close manually. This utility model uses an aluminum alloy-clad fireproof door, which is lighter in weight and has better compatibility with steel or aluminum alloy flat-panel prefabricated modules, while also providing ventilation, load-bearing capacity, wiring access, and convenient equipment entry and exit.

[0033] Specifically, in this embodiment, the frame 15 can be made of carbon steel. Optionally, the rock wool composite panel 14 is made of aluminum silicate. The fireproof door for prefabricated cabins is composed of the frame 15, the rock wool composite panel 14, and the aluminum alloy panel 11. The frame 15 ensures the overall strength of the door panel, and because it is only a skeletal structure, it is lighter in weight compared to traditional corrugated container doors made from a single piece of steel. Furthermore, the rock wool composite panel 14 is lightweight and has good fire and heat insulation properties; filling the frame 15 with the rock wool composite panel 14 achieves good heat insulation. The aluminum alloy panel 11 is also relatively lightweight, further reducing the overall weight of the fireproof door body. Therefore, the overall weight of the fireproof door body is significantly reduced while maintaining sufficient strength and meeting the fire resistance requirements of prefabricated cabin fireproof doors.

[0034] In summary, the fire doors used in this prefabricated cabin are relatively lightweight, easy to open and close manually, and have good strength and fireproof and heat insulation performance.

[0035] Furthermore, traditional corrugated container doors, which are made from a single piece of steel, also have the following disadvantages: poor thermal insulation performance; and when the equipment inside the prefabricated compartment is running, the temperature inside the compartment will rise (reaching over 60°C), causing the corrugated container door to expand and contract with temperature changes, especially deformation in the length and width directions of the door frame. This can cause the corrugated container door to jam against the door frame, making it more difficult to open and close manually.

[0036] In this embodiment, thermal insulation can be effectively achieved by filling the keel with rock wool composite board 14. Moreover, the rock wool composite board 14 in the fireproof door of this prefabricated cabin has a small coefficient of thermal expansion; specifically, it will not deform at a temperature of around 60°C.

[0037] However, due to the different coefficients of thermal expansion of the steel keel frame 15, rock wool composite panel 14, and aluminum alloy panel 11, the aluminum alloy panel 11 exhibits greater thermal deformation at high temperatures than the steel keel frame 15, which in turn exhibits greater thermal deformation than the rock wool composite panel 14. After prolonged use, bulging of the aluminum alloy panel 11 may occur.

[0038] Therefore, in this embodiment, as Figure 5 As shown, the keel includes a first square frame 151 and a second square frame 152. The first square frame 151 and the second square frame 152 are arranged opposite each other along the thickness direction of the fire door body 7. A corrugated expansion joint 153 is provided between the first square frame 151 and the second square frame 152. The corrugated expansion joint 153 is arranged along the thickness direction of the fire door body 7.

[0039] The corrugated expansion joint 153 can be made of aluminum alloy. That is, the material of the corrugated expansion joint 153 is the same as that of the outer covering side (i.e., aluminum alloy plate 11). During the thermal barrier contraction process, the corrugated expansion joint 153 between the first frame skeleton 151 and the second frame skeleton 152 is stretched and extended, thereby absorbing the deformation of the outer covering aluminum alloy plate 11 and avoiding the problem of bulging of the aluminum alloy plate 11.

[0040] Furthermore, since the corrugated expansion joint 153 is arranged along the thickness direction of the fire door body 7, its deformation also occurs along the thickness direction. Therefore, when the corrugated expansion joint 153 is subjected to tensile deformation, only the aluminum alloy plate 11 will be flattened along the thickness direction of the fire door, while the fire door body 7 will not deform in the length and width directions, thus avoiding the problem of the fire door body 7 getting stuck with the door frame. Therefore, the fire door body 7 has good flatness and rigidity.

[0041] In addition, the aluminum plate of the door leaf (i.e., the fire door body 7) adopts fluorocarbon spraying process, which is the same process as the outer shell of the cabin, resulting in good overall coordination and an aesthetically pleasing appearance.

[0042] Furthermore, both the first frame frame 151 and the second frame frame 152 are frame frames, each including a first keel rod, a second keel rod, a third keel rod, and a fourth keel rod. The first and second keel rods extend along the length of the door frame and are positioned opposite each other. The third and fourth keel rods extend along the width of the door frame and are positioned opposite each other. The third keel rod is located above the fourth keel rod, and both ends of the third keel rod are welded to the upper ends of the first and second keel rods, respectively. Both ends of the fourth keel rod are welded to the lower ends of the first and second keel rods, respectively.

[0043] Furthermore, the manufacturing process of the fire door body 7 of the fire door for this prefabricated cabin is as follows:

[0044] Obtain the 15-rock wool composite board 14 components of the keel frame.

[0045] An adhesive is applied to the inside of the aluminum alloy plate 11, and the aluminum alloy plate 11 is wrapped around the outside of the keel frame 15-rock wool composite panel 14 assembly.

[0046] The aluminum alloy plate 11 and the keel frame 15-rock wool composite plate 14 components are hot-pressed.

[0047] Furthermore, the keel frame 15-rock wool composite panel 14 components are obtained, specifically including:

[0048] Align the prefabricated first frame skeleton 151 and second frame skeleton 152.

[0049] The outer side of the prefabricated rock wool composite board 14 is coated with adhesive, and the rock wool composite board 14 is filled between the first frame skeleton 151 and the second frame skeleton 152.

[0050] One end of the prefabricated corrugated expansion joint 153 is welded to the first square frame 151, and the other end is welded to the second square frame 152.

[0051] Optionally, the adhesive is water-based polyurethane, and the hot-pressing temperature is 70-80℃.

[0052] Please see Figure 4 In this embodiment, the door frame includes: a first column 1, a second column 2, and a door beam assembly; the first column 1 and the second column 2 are arranged opposite to each other, the door beam is located between the first column 1 and the second column 2, and is connected to the upper end of the first column 1 and the second column 2, and one side of the fire door body 7 is hinged to the first column 1.

[0053] Furthermore, both the first column 1 and the second column 2 are provided with a wiring cavity extending in the vertical direction, which is used to lay electrical equipment cables on the door.

[0054] Please see Figure 3 In this embodiment, the door beam assembly includes a mounting frame 3, ventilation louvers 10, and a filter 9; the ventilation louvers 10 are mounted on the mounting frame 3, the filter 9 is mounted on the mounting frame 3, and the filter 9 is located inside the ventilation louvers 10.

[0055] Furthermore, the door beam assembly also includes: a first mesh panel 4 and a second mesh panel 5, which are arranged opposite to each other. The first mesh panel 4 and the second mesh panel 5 are respectively installed on the outer and inner sides of the mounting frame 3, and the ventilation louvers 10 and the filter 9 are both located between the two mesh panels.

[0056] Optionally, a drainage hole is provided at the lower end of the first mesh panel 4.

[0057] Furthermore, the upper space of this hatch is equipped with a combination of perforated plates, inner louvers, and filter cotton ventilation channels, as well as external drainage holes, which ensures ventilation while also providing dustproof and rainproof functions.

[0058] The upper ventilation system of the door frame consists of an external ventilation perforation plate, rainproof louvers, filter 9, and internal ventilation perforation plate. When wind blows from outside into the house, or when rain blows from outside into the house, the rainproof louvers and filter 9 can effectively block dust and rainwater. At the same time, the blocked rainwater flows to the lower part of the louvers and is discharged outside through the lower drainage hole.

[0059] In summary, the fireproof door for the prefabricated cabin in this embodiment has the following advantages:

[0060] 1. The main body of the fire door is relatively lightweight and easy to open and close;

[0061] 2. The fire door body 7 is not prone to bulging, and the outer aluminum alloy plate 11 covering it is kept flat;

[0062] 3. The column has a wiring cavity inside, which facilitates the wiring of equipment inside the prefabricated cabin.

[0063] 4. It has good dustproof and filtration effects.

[0064] Example 2

[0065] This embodiment is a further explanation and optimization of the fireproof door for prefabricated cabins in Embodiment 1, aiming to provide more detailed technical details or demonstrate the application effect of the equipment under different conditions.

[0066] The fireproof door for this prefabricated container can solve the following problems that exist with conventional corrugated container doors:

[0067] 1. It can solve the problem of inconvenient opening and closing of container corrugated doors: For containerized prefabricated cabins, traditional corrugated doors are relatively heavy, and the doors use heavy-duty J-type rubber sealing strips 13 to solve the sealing problem. The doors have a large rebound resistance during opening, and the locking rods use lever-type top and bottom rods, which also require a large torque when closing the doors, making the doors inconvenient to close.

[0068] 2. It can solve the problem of the appearance coordination between the hatch and the aluminum alloy flat-panel hull.

[0069] For aluminum alloy flat-panel prefabricated cabins, conventional flat-panel fire doors are steel fire doors, which have poor appearance coordination with aluminum alloy flat-panel prefabricated cabins. Due to different spraying processes, there will be color differences, affecting the aesthetics of the appearance.

[0070] 3. Able to solve the problem of cabling inside the cabin.

[0071] Prefabricated hatches typically include access control, limit switches, lighting switches, manual call buttons, etc. There are many cables inside the door frame. Conventional hatch wiring often uses buried conduits or direct exposed wiring, which makes maintenance and wiring relatively inconvenient.

[0072] 4. It can solve the problem that conventional hatches use a door frame and door that are embedded into the hatch frame as a whole, which occupies the length of the hatch and also restricts the net space of the door frame, which is not conducive to the entry and exit of equipment.

[0073] 5. It can solve the problem of poor dust prevention effect of conventional cabin doors. Conventional prefabricated cabin ventilation uses air intake under the eaves. Due to the small space under the eaves, filter 9 generally uses a thin nylon filter screen, which has poor dust prevention effect.

[0074] Specifically, the fire door of this prefabricated cabin is an aluminum alloy-clad fire door, filled with fireproof rock wool. It adopts a rock wool manual purification board cold pressing process, and uses adhesive to bond the aluminum plate, keel and rock wool into a whole. It has good rigidity, light weight and easy opening and closing.

[0075] The aluminum panels of the fireproof doors used in this prefabricated cabin adopt the same spraying process as the aluminum alloy wall panels of the cabin body, and are from the same batch. They are colorless overall and have good appearance coordination.

[0076] The fire door frame of this prefabricated cabin adopts an aluminum alloy cover plate design, which makes the wiring inside the door frame and the installation and wiring of switches, manual call points, etc. on the door frame relatively convenient.

[0077] The fire door frame of this prefabricated cabin is integrated with the cabin columns and cable trays, increasing the clear distance between the door frames. At the same time, the door frame adopts a snap-on design, which can be easily disassembled and facilitates wiring and maintenance.

[0078] The fireproof door of this prefabricated cabin is equipped with a perforated plate + inner louver + filter cotton combination ventilation channel in the upper space of the door, and is also equipped with an external drainage hole, which ensures ventilation while also providing dustproof and rainproof functions.

[0079] Furthermore, the fire door features a full-height design, with aluminum alloy mesh panels on both the inner and outer sides of the upper part of the door. Ventilation louvers 10 are installed inside, with a filter 9 installed behind the louvers. Drainage holes are located at the bottom of the aluminum alloy panel. The left and right sides of the fire door feature full-height irregularly shaped columns, with a central atrium beam. A single-tiered crossbeam is installed at the top of the door and at the threshold. The door frame is formed by welding the columns and the crossbeam.

[0080] Please see Figure 1 and Figure 2 The fire door includes: the fire door body 7 (i.e., the door leaf) and the door frame.

[0081] The door leaf is made of a composite of inner carbon steel keel and aluminum alloy plate 11. The keel is filled with aluminum silicate rock wool composite board 14. The keel, aluminum plate, aluminum silicate rock wool composite board 14, etc. are hot-pressed at high temperature with (commercially available) special adhesive.

[0082] The gatepost structure adopts a double-step C-shaped opening design on the left and right sides. The opening position can be bolted to install aluminum alloy sealing plates, and electrical equipment cables can be laid on the inside of the gatepost.

[0083] The aluminum alloy-clad fireproof doors used in this prefabricated substation cabin are mainly designed to be compatible with frame-type all-steel prefabricated cabins or aluminum alloy snap-on prefabricated cabins.

[0084] This aluminum alloy-clad fireproof door adopts an integrated design of the cabin column and door frame, which combines cabin load-bearing and cable routing functions. The door leaf adopts a rock wool manual purification board pressing process, which integrates aluminum plate, inner lining keel, aluminum silicate rock wool board, adhesive and other materials into one piece, which has good board surface flatness and rigidity. The aluminum plate of the door leaf adopts a fluorocarbon spraying process, which is the same process used for the cabin shell, resulting in good overall coordination and an aesthetically pleasing appearance.

[0085] The upper space of this hatch is equipped with a combination ventilation channel consisting of perforated plates, inner louvers, and filter cotton, and is also equipped with external drainage holes, which ensures ventilation while also providing dustproof and rainproof functions.

[0086] The upper inner perforated plate of this door is fixed with hinges, which can be opened and closed vertically, facilitating access control installation and cable routing.

[0087] Example 3

[0088] This utility model also discloses a prefabricated substation, including: a prefabricated compartment, wherein the compartment door adopts the fireproof door for the prefabricated compartment in Embodiment 1.

[0089] Specifically, the fire door for prefabricated cabins consists of a door frame and a door leaf (i.e., the main body of the fire door 7).

[0090] The door frame consists of a left door frame, a right door frame, upper, middle and lower door frames, an outer ventilation panel, an inner ventilation panel, rainproof louvers, and a filter.

[0091] The internal ventilation perforation plate is connected to the upper door frame using hinge 6 and to the middle door frame using bolts, enabling convenient maintenance of equipment cables on the door.

[0092] The left door frame, right door frame, upper, middle and lower door frames, external ventilation vents, rainproof louvers and other parts are all designed as a single welded unit.

[0093] The door post plate 12 is connected to the left and right door frames with bolts. When wiring or fixing equipment, the door post plate 12 can be removed, and wiring can be carried out in the space inside the door frame.

[0094] The upper ventilation system of the door frame consists of an external ventilation perforation plate, rainproof louvers, filter 9, and internal ventilation perforation plate. When wind blows from outside into the house, or when rain blows from outside into the house, the rainproof louvers and filter 9 can effectively block dust and rainwater. At the same time, the blocked rainwater flows to the lower part of the louvers and is discharged outside through the lower drainage hole.

[0095] The door leaf and the door frame are hinged together by hinge 6. A sealing strip 13 is sandwiched between the door leaf and the door frame. A push bar lock 8 is installed on the door leaf and locked to the door frame. When the door leaf and the door frame are locked, the sealing strip 13 is compressed and deformed, and the door is sealed and rainproof through the elasticity.

[0096] The door panel is made of aluminum composite panels, rock wool panels, door panel keel, etc., and is cold-pressed with high temperature adhesive.

[0097] The door, including the door frame and door leaf, can be embedded into the keel of the cabin as a whole, and the door frame is welded to the keel of the cabin.

[0098] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A fireproof door for prefabricated cabins, characterized in that, include: Door frame and fire door body (7), The fire door body (7) is housed in the door frame, and one side of the fire door body (7) is hinged to the door frame; The fire door body (7) includes a frame (15), a rock wool composite board (14), and an aluminum alloy plate (11); The keel frame (15) has a cavity inside. The rock wool composite board (14) is filled into the cavity of the keel frame (15). The aluminum alloy plate (11) is wrapped around the outside of the keel frame (15) and the rock wool composite plate (14).

2. The fireproof door for prefabricated cabins according to claim 1, characterized in that, The keel includes a first square frame (151) and a second square frame (152), which are arranged opposite to each other along the thickness direction of the fire door body (7). A corrugated expansion joint (153) is provided between the first frame frame (151) and the second frame frame (152), and the corrugated expansion joint (153) is provided along the thickness direction of the fire door body (7).

3. The fireproof door for prefabricated cabins according to claim 2, characterized in that, The first square frame (151) and the second square frame (152) are both square frame frames, and the square frame frames include a first keel rod, a second keel rod, a third keel rod and a fourth keel rod; The first and second keel rods extend along the length of the door frame and are positioned opposite each other; the third and fourth keel rods extend along the width of the door frame and are positioned opposite each other. The third keel rod is located above the fourth keel rod, and the two ends of the third keel rod are respectively welded to the upper ends of the first keel rod and the upper ends of the second keel rod. The two ends of the fourth keel rod are respectively welded to the lower ends of the first keel rod and the lower ends of the second keel rod.

4. The fireproof door for prefabricated cabins according to claim 1, characterized in that, The door frame includes: a first post (1), a second post (2), and a door beam assembly; The first column (1) and the second column (2) are arranged opposite to each other. The lintel is located between the first column (1) and the second column (2), and is connected to the upper ends of the first column (1) and the second column (2). One side of the fire door body (7) is hinged to the first column (1).

5. The fireproof door for prefabricated cabins according to claim 4, characterized in that, Both the first column (1) and the second column (2) have a wire-threading cavity extending in the vertical direction inside, which is used to lay electrical equipment cables on the door.

6. The fireproof door for prefabricated cabins according to claim 4, characterized in that, The lintel assembly includes a mounting frame (3), ventilation louvers (10), and a filter (9); The ventilation louvers (10) are installed on the mounting frame (3). The filter (9) is installed on the mounting frame (3) and is located inside the ventilation louver (10).

7. The fireproof door for prefabricated cabins according to claim 6, characterized in that, The portal beam assembly further includes: a first mesh panel (4) and a second mesh panel (5). The first mesh panel (4) and the second mesh panel (5) are arranged opposite to each other, and the first mesh panel (4) and the second mesh panel (5) are respectively installed on the outer side and the inner side of the mounting frame (3). The ventilation louvers (10) and the filter (9) are both located between the two mesh panels.

8. The fireproof door for prefabricated cabins according to claim 7, characterized in that, The lower end of the first mesh panel (4) is provided with a drainage hole.

9. The fireproof door for prefabricated cabins according to claim 1, characterized in that, The rock wool composite board (14) is made of aluminum silicate material.

10. A prefabricated substation, characterized in that, include: Prefabricated cabins The doors of the prefabricated cabin are fireproof doors for prefabricated cabins as described in any one of claims 1 to 9.

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