Multifunctional steel door and ro-ro passenger ship comprising same

Abstract

The invention provides a multifunctional steel door and a ro-ro passenger ship comprising the same, the multifunctional steel door comprises a door frame, an upper first door, an upper second door and a doorsill arranged below the upper first door and the upper second door, the doorsill is hinged to the door frame, and the doorsill can be set to be in an open state and a closed state independent of the upper first door and the upper second door. According to the novel steel door, a traditional steel door is improved, the doorsill is arranged to be of an openable and closable structural form, the doorsill is reasonably combined with the normally-opened door leaf, the novel steel door is provided, and the novel steel door is waterproof, fireproof, resistant to corrosion and easy to open and close, and meanwhile cargoes and people can conveniently pass through the novel steel door.

Description

Technical Field

[0001] The invention relates to the technical field of ship construction, in particular to a multifunctional steel door and a ro-ro passenger ship comprising the same. Background Art

[0002] In the special transport vehicle RoRo passenger ship, there are indeed many types of doors, and each door carries specific functions and requirements, including but not limited to waterproof, fireproof, corrosion-resistant, easy to open and close, and beautiful, etc. These requirements together constitute the complexity and diversity of the RoRo passenger ship door system.

[0003] However, as far as existing steel doors are concerned, although they are well-known for their durability, fireproof and anti-theft performance, they often adopt the design of an integral door with a relatively simple structure. This single structural design limits the flexibility and adaptability of the door to a certain extent. Especially in terms of the threshold height, in order to meet certain safety or structural requirements of ships, the threshold of steel doors is often designed to be higher, usually not less than 600mm.

[0004] However, this design has caused a significant problem in actual use: when large equipment or heavy cargo needs to enter and exit a room with a high-threshold steel door, the height of the threshold becomes a major obstacle to passage. Due to the high threshold, the equipment may not be able to pass directly, resulting in low loading and unloading efficiency. In some cases, additional measures (such as building a temporary ramp) may be required to assist the passage of equipment, which not only increases the cost and complexity of operation, but also may have a potential impact on the safety and stability of the ship.

[0005] In summary, the singleness of the structural design of existing marine steel doors and the problem of too high threshold height are the main deficiencies in the current technology. In order to solve these problems, it is necessary to develop a more flexible and adaptable door structure, and at the same time explore solutions to reduce the threshold height or design adjustable thresholds to meet the complex and changeable use requirements of ro-ro passenger ships. Summary of the invention

[0006] In view of the above-mentioned problems existing in the prior art, the present invention provides a multifunctional steel door, comprising: a door frame, an upper first door, an upper second door and a threshold arranged below the upper first door and the upper second door, the threshold being hingedly connected to the door frame, and the threshold can be set to an open state and a closed state independently of the upper first door and the upper second door.

[0007] Further, the threshold includes a sliding device disposed at the bottom end of the threshold;

[0008] Further, the upper first door and the upper second door are respectively hingedly connected to the door frame and include locking devices;

[0009] Further, the threshold includes a pedal, which is hingedly connected to the threshold and can be in an open state and a closed state;

[0010] Furthermore, the first upper door includes a first inner page panel, a first outer page panel, and a first side panel. The first inner page panel, the first outer page panel, and the first side panel surround and form a first cavity. A first functional layer is disposed in the first cavity.

[0011] Furthermore, the upper second door includes a second inner page panel, a second outer page panel, and a second side panel. The second inner page panel, the second outer page panel, and the second side panel surround a second cavity, and a first functional layer is arranged in the second cavity.

[0012] Furthermore, the door sill includes a third inner page panel, a third outer page panel, and a third side panel. The third inner page panel, the third outer page panel, and the third side panel form a third cavity, and the first functional layer is arranged in the third cavity.

[0013] Further, the upper first door includes a first baffle plate, which is arranged outside the first outer page plate and extends downward, and its extension length is greater than the downward extension length of the first outer page plate;

[0014] Furthermore, the upper second door includes a second baffle and a third baffle. The second baffle is arranged at the end of the opening and closing side of the second outer page plate and extends toward the opening and closing side. The third baffle is arranged at the bottom of the second outer page plate and extends downward. Its extension length is greater than the downward extension length of the second outer page plate.

[0015] The present invention further provides a ro-ro passenger ship, characterized by comprising any of the multifunctional steel doors described above.

[0016] Openable steel doors provide quick and direct access for vehicles, cargo and people, reducing loading and unloading time and special tools. This is particularly important for time-sensitive or high-frequency transport tasks. Compared with fixed thresholds or thresholds that require complex operations to open, openable steel doors are usually simpler in design, reducing manual intervention and errors during loading and unloading. Among them, steel doors have good watertightness, which can prevent seawater from pouring into the cabin in severe sea conditions and protect the safety of cargo and passengers. Steel has high fire resistance and explosion resistance, which can provide certain protection in fire or explosion events, delay the spread of fire, and buy time for evacuation and rescue. The design of openable steel doors allows ships to carry various types of vehicles and cargo, increasing the scope and flexibility of ships. Whether it is military transportation, tourist transportation during the peak tourist season or cargo transportation, openable steel doors can be adjusted and adapted according to actual needs. Steel doors have high structural strength and can withstand large impact and pressure, which helps to maintain the stability of the ship during navigation. In summary, the multifunctional steel door and the ro-ro passenger ship including the same provided by the present invention have significant advantages in loading and unloading efficiency, safety, scope of application, ship stability and operating cost, etc. These advantages enable the ship to exert higher efficiency and better performance in various transportation tasks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram showing a multifunctional steel door according to an embodiment of the present invention;

[0018] Figure 2 A schematic top view of an upper first door of a multifunctional steel door according to an embodiment of the present invention;

[0019] Figure 3 A schematic side view of an upper first door of a multifunctional steel door according to an embodiment of the present invention;

[0020] Figure 4 A schematic diagram showing the connection between an upper first door and a door frame of a multifunctional steel door according to an embodiment of the present invention;

[0021] Figure 5 A schematic top view of an upper second door of a multifunctional steel door according to an embodiment of the present invention;

[0022] Figure 6 A schematic side view of an upper second door of a multifunctional steel door according to an embodiment of the present invention;

[0023] Figure 7 A schematic diagram showing the connection between an upper second door and a door frame of a multifunctional steel door according to an embodiment of the present invention;

[0024] Figure 8A schematic diagram showing the connection between an upper first door and an upper second door of a multifunctional steel door according to an embodiment of the present invention;

[0025] Fig. 9 A schematic side view of a threshold of a multifunctional steel door according to an embodiment of the present invention;

[0026] Description of the drawings: 1-door frame, 2-upper first door, 3-upper second door, 4-threshold, 5-first locking device, 6-handle, 7-hinge device, 8-second locking device, 9-sliding device, 10-pedal assembly, 12-door frame blocking portion, 13-door frame blocking space, 21-first outer page plate, 22-first inner page plate, 23-first side plate, 24-first functional layer, 25-first wrapping portion, 26-first locking portion, 27-first blocking portion, 29-first connecting member, 211-first accommodating portion, 214-anti- Fire bar, 217-first baffle, 31-second outer page plate, 32-second inner page plate, 35-second baffle, 36-second accommodating portion, 37-sealing member, 38-second side plate, 39-second connecting member, 311-third accommodating portion, 317-third baffle, 41-third outer page plate, 42-third inner page plate, 44-third side plate, 45-third wrapping portion, 46-third locking portion, 47-third blocking portion, 71-first hinged portion, 72-second hinged portion, 73-hinge shaft, 91-connecting portion, 92 roller. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all 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.

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, it can be a mechanical connection, it can be an electrical connection, it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] A multifunctional steel door, such as Figure 1 As shown, Figure 1 A schematic diagram of a multifunctional steel door according to an embodiment of the present invention is shown. A multifunctional steel door comprises a door frame 1, an upper first door 2, an upper second door 3 and a threshold 4. The upper first door 2, the upper second door 3 and the threshold 4 are enclosed in the door frame 1 and are all hingedly connected to the door frame 1. The hinged connection here can be understood as the upper first door, the upper second door and the threshold can all rotate relative to the door frame and be in an open state or a closed state of the three doors. At the same time, the three doors can also be set to an open state and a closed state relative to the door frame independently of each other.

[0033] In a further embodiment, the multifunctional steel door of the present invention further comprises a first locking device 5 , a handle 6 , a hinge device 7 , and a second locking device 8 .

[0034] Furthermore, the first locking device 5 is arranged at the upper first door and the upper second door, and is arranged near the joint part between the two doors and the door frame, or near the joint part between the two doors, that is, the two doors can be locked relative to the door frame, or the two doors can be locked relative to each other. The locking device can be set to an open state and a locked state. When the locking device is in the open state, the door can be opened, and when the locking device is in the locked state, the door can be locked relative to the door frame and cannot be opened.

[0035] In another embodiment, the threshold of the multifunctional steel door of the present invention includes a sliding device 9 at one end, which is arranged at one end of the threshold and a hinge is arranged at the other end. The hinge is connected to the door frame and plays a role in supporting the threshold. The sliding device is arranged at the other side where the threshold is connected to the hinge and also plays a supporting role. At the same time, when the threshold is opened or closed, the sliding device also plays a role in supporting the threshold.

[0036] In another embodiment, one side of the threshold includes the pedal assembly 10. In another embodiment, both sides of the threshold include the pedal assembly. The two sides described here are the inner side and the outer side of the door. The pedal is hingedly connected to the threshold and can be in an open state and a closed state.

[0037] For the detailed description of the first door, Figure 2 As shown, Figure 2 The schematic diagram of the top view of the first upper door of a multifunctional steel door according to an embodiment of the present invention is shown. The first upper door 2 includes a first outer panel 21, a first inner panel 22 and a first side panel 23. The first outer panel 21, the first inner panel 22 and the first side panel 23 surround and form an overall frame of the first upper door. In the present invention, the definition Figure 2 The left side of the upper first door is a hinged side, and the right side is an opening side. The opening side of the first outer panel 21 includes a first wrapping portion 25 bent toward the first inner panel 22, and the first wrapping portion 25 extends toward the first inner panel and is combined with the first inner panel.

[0038] As shown in the figure, the upper first door 2 is connected to the door frame 1 through a hinge device 7, one side of the hinge device 7 is fixed to the door frame 1, and the other side is fixed to the first outer page plate 21 of the upper first door.

[0039] In another embodiment, the first outer panel 21, the first inner panel 22 and the first side panel 23 surround the first door and form an overall frame including a first cavity, in which a first functional layer 24 is disposed. The first functional layer 24 can be disposed on the inner surface of the first outer panel 21 or on the inner surface of the first inner panel 22.

[0040] In a further example, the first functional layer may be a fireproof layer, a heat insulating layer, a moisture-proof layer, a sound insulating layer, etc., and may specifically be ceramic wool.

[0041] In a further example, the first inner page board 22 further includes a second functional layer, and the second functional layer can be a fireproof layer, a heat insulation layer, a moisture-proof layer, a sound insulation layer, etc.

[0042] In a further embodiment, the first outer sheet 21 includes a first functional layer, and the first inner sheet 22 includes a second functional layer.

[0043] A first locking device 5 is arranged in the first cavity. When the first locking device is in a locked state, the locking pin extends out of the first side plate and is inserted into the door frame 1. When the first locking device is in an open state, the locking pin is retracted into the first cavity.

[0044] On the opening and closing side of the upper first door, the first inner page plate extends toward the opening and closing side, and a longer portion extends out relative to the first outer page plate, which is the first locking portion 26 of the upper first door. As shown in the figure, a first blocking portion 27 is included between the end of the first locking portion 26 and the first wrapping portion 25. The first locking portion 26, the first wrapping portion 25 and the first blocking portion 27 surround and form a first blocking space. The first blocking space cooperates with the locking device of the upper second door to achieve locking of the upper first door and the upper second door. Similarly, the door frame, the upper second door and the threshold are also provided with configurations with the same function.

[0045] like Figure 3 As shown, Figure 3 A schematic side view of the first door of a multifunctional steel door according to an embodiment of the present invention is shown. A first connecting member 29 is included between the first inner page plate and the first outer page plate. The first connecting member 29 is used to connect the first inner page plate and the first outer page plate. At the same time, the first connecting member 29 plays a role in strengthening the inner and outer page plates, thereby enhancing the strength of the steel door.

[0046] In another embodiment, a first baffle 217 is disposed at the bottom of the first outer page plate. The first baffle 217 is welded to the outer side of the first outer page plate and extends downward. The extension length is greater than the downward extension length of the first outer page plate.

[0047] like Figure 4 As shown, Figure 4 A schematic diagram showing the connection between the upper first door and the door frame of a multifunctional steel door according to an embodiment of the present invention is shown. Specifically, the hinge device 7 includes a first hinge portion 71, a second hinge portion 72 and a hinge shaft 73, wherein the first hinge portion is fixedly connected to the door frame 1, for example, by welding or by bolts, rivets, etc., and the second hinge portion 72 is fixedly connected to the first outer page plate of the upper first door, for example, by welding or by bolts, rivets, etc.

[0048] Furthermore, the door frame 1 includes a door frame locking portion bent toward the upper first door side, and also includes a door frame blocking portion 12, and the door frame locking portion and the door frame blocking portion 12 surround a door frame blocking space 13. The door frame blocking space 13 can be used to accommodate a locking pin extending from a locking device on the upper first door, so that the upper first door is locked with the door frame.

[0049] Furthermore, on the first outer page plate of the upper first door, on the hinged side, there is a first accommodating portion 211 bent toward the first inner page plate of the upper first door. The first accommodating portion 211 can be a bending portion formed by bending the end of the first outer page plate toward the first inner page plate, so that the first accommodating portion 211, the first outer page plate and the first side plate together form a sealing groove.

[0050] In another embodiment, the sealing groove is filled with a sealing member 37, which may be a rubber strip. When the upper first door is in a closed state, the end of the door frame locking portion on the door frame 1 abuts against and presses the sealing member 37 to play a sealing role.

[0051] In another embodiment, a fireproof strip 214 is provided on the outer side of the first side plate of the upper first door, that is, on the outer side of the first cavity.

[0052] The detailed description of the second door is as follows Figure 5 As shown, Figure 5 A schematic top view of an upper second door of a multifunctional steel door according to an embodiment of the present invention is shown. The upper second door 3 includes a second outer panel 31, a second inner panel 32, and a second side panel 38. The second side panel 38 is disposed on both sides of the second outer panel 31 and the second inner panel 32 and is fixedly connected thereto. The second outer panel 31, the second inner panel 32, and the second side panel 38 surround and form an overall frame of the upper second door. In the present invention, the definition Figure 5 The right side of the upper second door shown is the hinged side and the left side is the opening and closing side.

[0053] As shown in the figure, the upper second door 3 is connected to the door frame 1 through a hinge device 7, one side of the hinge device 7 is fixed to the door frame 1, and the other side is fixed to the first outer page plate 31 of the upper first door.

[0054] In another embodiment, the second outer panel 31, the second inner panel 32 and the second side panel 38 surround the overall frame of the first upper door, including a second cavity, in which the first functional layer 24 is disposed. The first functional layer 24 can be disposed on the inner surface of the second outer panel 31 or on the inner surface of the second inner panel 32.

[0055] In a further example, the first functional layer may be a fireproof layer, a heat insulating layer, a moisture-proof layer, a sound insulating layer, etc., and may specifically be ceramic wool.

[0056] In a further example, the second inner page board 32 further includes a second functional layer, and the second functional layer can be a fireproof layer, a heat insulation layer, a moisture-proof layer, a sound insulation layer, etc.

[0057] In a further embodiment, the second outer sheet 31 includes a first functional layer, and the second inner sheet 32 ​​includes a second functional layer.

[0058] A first locking device 5 is arranged in the second cavity. When the first locking device is in a locked state, the locking pin extends out of the first side plate and is inserted into the door frame 1. When the first locking device is in an open state, the locking pin is retracted into the second cavity.

[0059] The opening and closing side of the upper second door further includes a first locking device 5. When the first locking device 5 is in a locked state, the locking pin extends out of the second side plate and is inserted into the first blocking space of the upper first door 2. When it is in an open state, the locking pin is retracted into the second cavity.

[0060] In another embodiment, a second baffle 35 is provided at the end of the opening and closing side of the second outer page plate, and the second baffle 35 is welded to the outer side of the second outer page plate and extends toward the opening and closing side, and its extension length is greater than the extension length of the second outer page plate toward the opening and closing side. Its function is that when the upper first door and the upper second door are closed, the second baffle 35 covers the gap between the upper first door and the upper second door, and can play the role of fire prevention, moisture prevention, waterproof, sound insulation, etc.

[0061] like Figure 6 As shown, Figure 6 A schematic side view of the second upper door of a multifunctional steel door according to an embodiment of the present invention is shown. A second connecting member 39 is included between the second inner page plate and the second outer page plate. The second connecting member 39 is used to connect the second inner page plate and the second outer page plate. At the same time, the second connecting member 39 plays a role in strengthening the inner and outer page plates, thereby enhancing the strength of the steel door.

[0062] In another embodiment, a third baffle 317 is provided at the bottom of the second outer page plate, and the third baffle 317 is welded to the outer side of the second outer page plate and extends downward, and its extension length is greater than the downward extension length of the second outer page plate, so as to play the role of fire prevention, moisture prevention, waterproof, sound insulation, etc.

[0063] like Figure 7 As shown, Figure 7 A schematic diagram showing the connection between the upper second door and the door frame of a multifunctional steel door according to an embodiment of the present invention is shown. Specifically, the hinge device 7 includes a first hinge portion 71, a second hinge portion 72 and a hinge shaft 73, wherein the first hinge portion is fixedly connected to the door frame 1, for example, by welding or by bolts, rivets, etc., and the second hinge portion 72 is fixedly connected to the second outer page plate of the upper second door, for example, by welding or by bolts, rivets, etc.

[0064] Furthermore, the door frame 1 includes a door frame locking portion bent toward the upper second door side, and also includes a door frame blocking portion 12, and the door frame locking portion and the door frame blocking portion 12 surround a door frame blocking space 13. The door frame blocking space 13 can be used to accommodate a locking pin extending from a locking device on the upper second door, so that the upper second door is locked with the door frame.

[0065] Furthermore, on the second outer page plate of the upper second door, on the hinge side, there is a third accommodating portion 311 bent toward the second inner page plate of the upper second door. The third accommodating portion 311 can be a bending portion formed by bending the end of the second outer page plate toward the second inner page plate, so that the third accommodating portion 311, the second outer page plate and the second side plate jointly form a sealing groove.

[0066] In another embodiment, the sealing groove is filled with a sealing member 37, which may be a rubber strip. When the upper second door is in a closed state, the end of the door frame locking portion on the door frame 1 abuts against and presses the sealing member 37 to play a sealing role.

[0067] In another embodiment, a fireproof strip 214 is provided on the outer side of the second side plate of the upper second door, that is, on the outer side of the second cavity.

[0068] like Figure 8 As shown, Figure 8 A schematic diagram showing the connection between the upper first door and the upper second door of a multifunctional steel door according to an embodiment of the present invention is shown. The figure is only a partial schematic diagram of the upper first door and the upper second door in a closed state. In the figure, the opening and closing side of the second outer page plate 31 includes a second accommodating portion 36 bent toward the second inner page plate 32, and the second accommodating portion 36 can be a bent portion formed by bending the end of the second outer page plate toward the second inner page plate, so that the second accommodating portion 36, the second outer page plate and the second side plate together form a sealing groove.

[0069] In another embodiment, the sealing groove is filled with a sealing member 37, which may be a rubber strip. When the upper second door is in a closed state, the end of the first locking portion 26 on the upper first door 2 abuts against and presses the sealing member 37 to perform a sealing function.

[0070] The detailed description of the threshold is as follows Fig. 9 As shown, Fig. 9 A schematic side view of a threshold of a multifunctional steel door according to an embodiment of the present invention is shown. The threshold 4 includes a third outer panel 41, a third inner panel 42 and a third side panel 44. The third outer panel 41, the third inner panel 42 and the third side panel 44 surround and form an overall frame of the threshold. The upper side of the third outer panel 41 includes a third wrapping portion 45 bent toward the third inner panel 42, and the third wrapping portion 45 extends toward the third inner panel and is combined with the third inner panel 42.

[0071] The threshold 4 is connected to the door frame by a hinge device, one side of the hinge device is fixed to the door frame 1, and the other side is fixed to the third outer page 41 of the threshold 4. The principle and structure are consistent with the hinge principle and structure of the first door and the door frame.

[0072] In another embodiment, the third outer panel 41, the third inner panel 42 and the third side panel 44 surround the whole frame forming the door sill, including a third cavity, and the first functional layer 24 is arranged in the third cavity. The first functional layer 24 can be arranged on the inner surface of the third outer panel 41 or the inner surface of the third inner panel 42.

[0073] In a further example, the first functional layer may be a fireproof layer, a heat insulating layer, a moisture-proof layer, a sound insulating layer, etc., and may specifically be ceramic wool.

[0074] In a further example, the third inner page board 42 further includes a second functional layer, and the second functional layer can be a fireproof layer, a heat insulation layer, a moisture-proof layer, a sound insulation layer, etc.

[0075] In a further embodiment, the third outer sheet 41 includes a first functional layer, and the third inner sheet 42 includes a second functional layer.

[0076] A second locking device 8 is provided in the third cavity. The second locking device 8 is provided on the inner side of the third inner plate 42 and can rotate relative to the third inner plate 42 . When the second locking device 8 is in a locked state, the second locking device 8 abuts against the inner side of the door frame 1 .

[0077] On the upper side of the door sill, the third inner page plate 42 extends upward, and a longer portion than the third inner page plate is extended, which is the third locking portion 46 of the door sill. As shown in the figure, a third blocking portion 47 is included between the end of the third locking portion 46 and the third wrapping portion 45. The third locking portion 46, the third wrapping portion 45 and the third blocking portion 47 surround and form a third blocking space. The third blocking space cooperates with the locking devices of the upper first door and the upper second door to achieve locking with the upper first door and the upper second door respectively.

[0078] In a further embodiment, a sliding device 9 is provided on the outer side of the threshold, wherein the sliding device 9 includes a connecting portion 91 and a roller 92, and the connecting portion 91 is used to position and fix the roller on the outer side of the threshold.

[0079] The present invention further provides a ro-ro passenger ship with a new steel door comprising any one of the above technical solutions or a combination of solutions.

[0080] The present invention improves the traditional steel door, sets the threshold as an openable and closable structure, and reasonably combines it with the normally opened door leaf, thereby providing a new type of steel door. The new type of steel door is waterproof, fireproof, corrosion-resistant, easy to open and close, and convenient for the passage of goods and people.

[0081] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A multifunctional steel door, comprising: A door frame, an upper first door, an upper second door and a threshold arranged below the upper first door and the upper second door, wherein the threshold is hingedly connected to the door frame and can be set to an open state and a closed state independently of the upper first door and the upper second door.

2. According to the multifunctional steel door of claim 1, the threshold comprises a sliding device arranged at the bottom end of the threshold.

3. According to the multifunctional steel door of claim 1, the upper first door and the upper second door are respectively hingedly connected to the door frame, and both include locking devices.

4. The multifunctional steel door according to claim 1, wherein the threshold comprises a pedal, the pedal is hingedly connected to the threshold, and the pedal can be in an open state and a closed state.

5. According to the multifunctional steel door according to claim 1, the upper first door includes a first inner page panel, a first outer page panel and a first side panel, the first inner page panel, the first outer page panel and the first side panel surround and form a first cavity, and a first functional layer is arranged in the first cavity.

6. According to the multifunctional steel door according to claims 1 and 5, the upper second door includes a second inner page panel, a second outer page panel and a second side panel, the second inner page panel, the second outer page panel and the second side panel surround and form a second cavity, and the first functional layer is arranged in the second cavity.

7. According to the multifunctional steel door according to claims 1 and 5, the threshold includes a third inner page plate, a third outer page plate and a third side plate, the third inner page plate, the third outer page plate and the third side plate surround and form a third cavity, and the first functional layer is arranged in the third cavity.

8. According to the multifunctional steel door as described in claim 1, the upper first door includes a first baffle plate, which is arranged on the outside of the first outer page plate and extends downward, and its extension length is greater than the downward extension length of the first outer page plate.

9. According to the multifunctional steel door according to claim 1, the upper second door includes a second baffle and a third baffle, the second baffle is arranged at the end of the opening and closing side of the second outer page plate and extends toward the opening and closing side, the third baffle is arranged at the bottom of the second outer page plate and extends downward, and its extension length is greater than the downward extension length of the second outer page plate.

10. A passenger ro-ro ship, characterized in that A multifunctional steel door comprising the multifunctional steel door as described in any one of claims 1-9.

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