Marine built-in hinge and door drive system with built-in hinge

Abstract

The present invention provides a concealed hinge for a ship and a door drive system with the concealed hinge wherein the concealed hinge comprises: a first hinge for being provided on a hull structure; the second hinge is arranged on the door; the connecting shaft is connected with the first hinge and the second hinge; wherein the first hinge comprises a first hinge unit, a second hinge unit, a third hinge unit and at least two first hinge shafts, and the first hinge shafts are used for connecting the first hinge unit, the second hinge unit and the third hinge unit; the second hinge comprises a fourth hinge unit, a fifth hinge unit, a sixth hinge unit and at least two second hinge shafts, and the second hinge shafts are used for connecting the fourth hinge unit, the fifth hinge unit and the sixth hinge unit.

Description

Technical Field

[0001] This invention relates to a closing mechanism for side openings on a ship, and more particularly to a ship-mounted concealed hinge and a door drive system with a concealed hinge. Background Technology

[0002] Specialized vessels such as offshore engineering vessels and research vessels are often equipped with underwater robot (ROV) hangars for the safe storage, release, and retrieval of ROVs. These hangars require dedicated ROV doors on their sides. These doors must remain closed under normal circumstances and meet weathertight or watertight requirements, while they must be reliably opened during operations to allow the ROV to be moved overboard to perform its tasks.

[0003] Currently, common ROV door opening and closing solutions mainly fall into two categories: The first is a 90° opening door using traditional hinges. While this solution ensures the flatness of the hull's outer surface, its opening angle is limited, potentially causing spatial interference with the ROV's recovery path or the entry and exit of large equipment, resulting in insufficient flexibility. The second is an external hinge solution designed to achieve a 180° wide opening. Although this solution provides ample opening space, the hinge structure protrudes from the hull surface, disrupting the flatness and smoothness of the hull's lines. This not only affects the ship's aesthetics but may also increase navigation resistance. Furthermore, in harsh sea conditions, exposed hinges are more susceptible to corrosion and collision damage.

[0004] Therefore, existing ROV door hinge systems struggle to simultaneously meet the dual requirements of large-angle (e.g., 180°) opening and hull surface flatness. To address this technical challenge, an innovative solution is urgently needed that allows the door to open at a large angle while completely concealing the hinge structure, maintaining the continuity and flatness of the hull's outer plating. Summary of the Invention

[0005] A major advantage of this invention is that it provides a hinge device that can achieve a 180° opening angle while ensuring that the outer surface of the hull side is completely flat, fundamentally solving the core contradiction in traditional solutions where "opening angle" and "flatness" cannot be achieved simultaneously.

[0006] Another advantage of this invention is that it provides a completely concealed hinge structure with no exposed parts. This device remains hidden within the internal space between the door and the hull structure throughout the entire opening and closing process, significantly improving the overall integrity and aesthetics of the ship's appearance, effectively reducing navigation resistance, and avoiding the risks of exposed hinges being susceptible to corrosion and collision damage in harsh sea conditions.

[0007] A further advantage of this invention is that it provides a precision motion system based on a dual-coupled multi-link mechanism. Through a specific arrangement of connecting shafts between the first and second hinges, the door is guided to execute a composite motion trajectory involving rotation and translation, thereby achieving smooth, large-angle opening within a limited space, without the mechanism itself protruding outwards.

[0008] An additional advantage of this invention is that it provides a hinge device with high stability and long service life. By systematically setting compensating washers at multiple key connection points (such as the connection between the second hinge unit and the drive device, the connection between the fifth and fourth hinge units, etc.), manufacturing and assembly tolerances are effectively absorbed, play in motion is eliminated, ensuring smooth and noiseless movement of the door when subjected to wind and wave loads, and enhancing the long-term reliability of the sealing surface.

[0009] An additional advantage of this invention is that it provides a hinge design with an integrated mechanical safety locking function. By providing a dedicated locking hole on the drive input unit (second hinge unit), independent mechanical locking can be performed when the door is opened to the working position (e.g., 180°), providing double protection for operational safety and preventing the door from closing due to unexpected failure of the drive system.

[0010] A related advantage of this invention is that it provides a highly modular and adaptable shafting design. The connecting shaft and hinge shaft can be flexibly configured with short or long shafts, which can meet different space constraints and strength requirements, and also facilitate installation, maintenance and component replacement, thereby enhancing the applicability of the device to different ship types and portal types.

[0011] A key advantage of this invention is that it provides a highly versatile solution. This concealed hinge device is not only specifically designed for ROV doors, but is also suitable for other weatherproof or watertight portholes requiring high sealing and wide opening, showing broad application prospects in high-end offshore vessels, research vessels, and even yachts with stringent aesthetic requirements.

[0012] In summary, through a series of collaborative and innovative designs, this invention provides a comprehensive solution that significantly outperforms existing technologies in terms of functionality, reliability, security, and aesthetics.

[0013] According to one aspect of the present invention, a concealed hinge of the present invention, capable of achieving the aforementioned and other objects and advantages, comprises:

[0014] The first hinge is used to be installed on the hull structure;

[0015] The second hinge is used to install on the door;

[0016] And the connecting shaft that connects the first hinge and the second hinge;

[0017] The first hinge includes a first hinge unit, a second hinge unit, a third hinge unit, and at least two first hinge axes, wherein the first hinge axes are used to connect the first hinge unit, the second hinge unit, and the third hinge unit.

[0018] The second hinge includes a fourth hinge unit, a fifth hinge unit, a sixth hinge unit, and at least two second hinge axes, the second hinge axes being used to connect the fourth hinge unit, the fifth hinge unit, and the sixth hinge unit.

[0019] According to one embodiment of this application, the first hinge unit is used to be fixedly mounted on the hull structure;

[0020] The fourth hinge unit is used to be fixedly mounted on the door;

[0021] The second hinge unit is connected to the third hinge unit via the connecting shaft;

[0022] The third hinge unit is connected to the sixth hinge unit via the connecting shaft, and is connected to the fourth hinge unit via a second hinge shaft.

[0023] According to one embodiment of this application, the first hinge unit and / or the fourth hinge unit are plate-shaped structures with a welding surface on one side for welding and fixing.

[0024] According to one embodiment of this application, the connecting shaft, the first hinge shaft, and / or the second hinge shaft are long shafts or short shafts.

[0025] According to one embodiment of this application, when the connecting shaft or hinge shaft is a long shaft, its length is greater than the combined thickness of the first hinge and the second hinge at the connection position of the shaft.

[0026] According to one embodiment of this application, a mounting portion for connecting to a drive device is provided on the second hinge unit, and a locking hole is provided at the mounting portion for locking and fixing when the door is opened to a preset position.

[0027] According to one embodiment of this application, the locking hole is a threaded hole or a pin hole, and its axis is parallel to the axis of the hinge shaft at the mounting part.

[0028] According to one embodiment of this application, a washer is provided at at least one of the following connections: the connection between the second hinge unit and the drive device, the connection between the fifth hinge unit and the fourth hinge unit, the connection between the sixth hinge unit and the first hinge unit, and the connection between the sixth hinge unit and the third hinge unit.

[0029] According to another aspect of this application, this application further provides a gate driving system, comprising:

[0030] Concealed hinges as described in any of the above;

[0031] The device includes a drive mechanism connected to the second hinge unit of the first hinge, which drives the movement of the concealed hinge to open or close the door.

[0032] According to one embodiment of this application, the driving device is a hydraulic cylinder, a pneumatic cylinder, or an electric driving device.

[0033] According to another aspect of this application, this application further provides a ship, including a hull structure and a door disposed on the hull structure, the door being connected to the hull structure by a concealed hinge as described above, and / or the ship including a door drive system as described above;

[0034] The concealed hinge is hidden in the internal space between the hull structure and the door, and no protruding parts are visible when viewed from the outside of the ship.

[0035] According to one embodiment of this application, the door is an ROV door, a weatherproof door, or a watertight door, and the door can be opened 180°.

[0036] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings.

[0037] These and other objects, features and advantages of the present invention will become fully apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a door drive system with a concealed hinge in the closed position according to a first preferred embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the door drive system with a concealed hinge according to the first preferred embodiment of the present invention in the fully open position.

[0040] Figure 3A and Figure 3B This is a top view of the door drive system with a concealed hinge according to the first preferred embodiment of the present invention in the closed and open states.

[0041] Figure 4A and Figure 4B This is a schematic diagram of the structure of the concealed hinge in the closed state and the fully open state according to the first preferred embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram of the structure of each component of the concealed hinge according to the first preferred embodiment of the present invention. Detailed Implementation

[0043] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0044] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0045] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0046] Refer to the accompanying drawings in this application specification. Figures 1 to 5 As shown, a marine concealed hinge and a door drive system with a concealed hinge according to a first preferred embodiment of this application are described below. The concealed hinge 100 includes a first hinge 1 fixed to the hull structure, a second hinge 2 fixed to the door, and a connecting shaft 3 that enables power transmission and motion coupling between the two. It is worth noting that the entire device of the concealed hinge in this preferred embodiment is completely hidden within the internal space enclosed by the door and the hull structure during operation. Viewed from the outside of the ship, the outer hull plating appears continuous and smooth, without any protrusions.

[0047] Specifically, the first hinge 1 includes a first hinge unit 11, a second hinge unit 12, a third hinge unit 13, and at least two first hinge axes 14, wherein the first hinge axes 14 are used to connect the first hinge unit 11, the second hinge unit 12, and the third hinge unit 13.

[0048] The second hinge 2 includes a fourth hinge unit 21, a fifth hinge unit 22, a sixth hinge unit 23, and at least two second hinge axes 24, the second hinge axes 24 being used to connect the fourth hinge unit 21, the fifth hinge unit 22, and the sixth hinge unit 23.

[0049] The first hinge unit 11 of the first hinge 1 is typically a base made of thick steel plate, with a large, flat welding surface on one side. This welding surface is used for full-penetration welding to the hull structure (such as ribs, bulkheads, or special reinforcing frames) to ensure that the connection strength is sufficient to withstand the weight of the door and external loads. Its plate-like design helps to distribute stress.

[0050] One end of the second hinge unit 12 is hinged to the first hinge unit 11 via a first sub-hinge shaft 141, forming a first revolute joint. The other end is hinged to the third hinge unit 13 via a second sub-hinge shaft 142. Crucially, the second hinge unit 12 is equipped with a dedicated drive mounting part 121, which is hinged to an external drive device (such as the piston rod end of a hydraulic cylinder) via another first hinge shaft (which can be called a drive connecting shaft). Near the drive mounting part 121, a locking hole 122 is machined. The axis of this locking hole 122 is parallel to the axis of the drive connecting shaft. Its function is to allow bolts or locking pins to be inserted when the door is opened to its maximum 180° position, locking the second hinge unit 12 to the fixed part of the drive device or the adjacent hull structure. This achieves mechanical locking of the door in the fully open state, ensuring safety and reliability, and preventing accidental closure due to depressurization of the drive system or ship swaying.

[0051] The third hinge unit 13 serves as an intermediate connecting rod. One end is connected to the second hinge unit 12 via the second sub-hinge shaft 142, and the other end is connected to the sixth hinge unit 23 of the second hinge 2 via a connecting shaft 3. Simultaneously, its side is also connected to the fourth hinge unit 21 of the second hinge 2 via a second hinge shaft. This connection point is one of the key aspects of realizing the concealed structure, ensuring that the first hinge 1 and the second hinge 2 remain internally engaged during movement, rather than unfolding outwards.

[0052] The second hinge 2 serves as the driven side and the direct load-bearing component of the door. The fourth hinge unit 21 of the second hinge 2 is a plate-like structure similar to the first hinge unit 11, with a welding surface 211 on one side for secure welding to the inner back of the door. This design ensures uniform force distribution on the door.

[0053] One end of the fifth hinge unit 22 is hinged to the fourth hinge unit 21 via the third sub-hinge shaft 231. Since the connection gap here may be too large due to manufacturing defects or deformation, at least one pair of compensating washers 41 are provided on the third sub-hinge shaft 231, between the fifth hinge unit 22 and the fourth hinge unit 21, to ensure smooth movement and eliminate play. The washers 41 can be made of wear-resistant metal or engineering plastic, and their inner holes are precisely fitted to the shaft to cover the gap.

[0054] The sixth hinge unit 23 is connected to both the first hinge 1 and other parts of its own system. One end of the sixth hinge unit 23 is connected to the third hinge unit 13 of the first hinge 1 via a connecting shaft 3.

[0055] The middle part of the sixth hinge unit 23 is connected to the third hinge unit 13 of the first hinge 1 via another connecting shaft 3. At these two connection points with the first hinge 1, since the intersection of two independent hinge systems involves a large range of motion, clearance control is crucial. Therefore, on both connecting shafts 3, compensation washers 42 are also provided between the corresponding units of the sixth hinge unit 23 and the first hinge 1.

[0056] The other end of the sixth hinge unit 23 is connected to the other end of the fifth hinge unit 22 via a second hinge shaft (e.g., the fifth sub-hinge shaft 242). This shaft may be designed as a long shaft according to space requirements, with a length significantly greater than the total thickness of the first and second hinges stacked at that location, to ensure that all the hinge units connected in series (the fifth hinge unit 22, the sixth hinge unit 23, and the associated washers) can rotate freely without interference.

[0057] It is worth mentioning that the first hinge shaft 14 (including 141, 142, etc.) and the second hinge shaft 24 can be selectively implemented as short shafts or long shafts according to the specific installation space, strength requirements, and lubrication and maintenance needs. Short shafts are suitable for situations where the space on both sides of the connection point is limited and only two adjacent components need to be connected; long shafts are used in situations where multiple components need to be connected (such as multiple units that connect the first hinge and the second hinge at the same time, or where an external locking device is required).

[0058] When the drive device (such as a hydraulic cylinder) retracts, it pulls the second hinge unit 12 of the first hinge 1 to rotate around the first sub-hinge axis 141. This movement drives the third hinge unit 13 through the second sub-hinge axis 142, and then pushes the sixth hinge unit 23 of the second hinge 2 through the two connecting shafts 3. Since the fourth hinge unit 21 is fixed to the door, the combined movement of the fifth hinge unit 22 and the sixth hinge unit 23 will ultimately drive the door to undergo a smooth movement trajectory from parallel to the hull (closed state) to gradually rotating out, and finally fully unfolded to form a 180° angle with the hull surface (open state).

[0059] Understandably, throughout the entire movement, all hinges and pivots are located in the internal space between the door and the hull, completely eliminating the disruption to the hull's shape caused by traditional external hinges.

[0060] The complex multi-link mechanism design allows the door to rotate 180°, providing an unobstructed passage for large equipment such as ROVs, which is unmatched by traditional 90° hinged doors.

[0061] This application effectively compensates for machining and assembly tolerances and eliminates play in motion by setting washers (41,42) at multiple key connection points, so that the door can remain stable and noiseless when opening, closing and bearing wind and wave loads, thereby improving service life and sealing performance.

[0062] In addition, the locking hole 122 specially designed in this application provides a mechanical locking means independent of the drive system, ensuring absolute safety when the door is fully open during operation and avoiding the risks caused by the failure of the hydraulic or electrical system.

[0063] Specifically, the concealed hinge of this application works by using a composite motion system composed of two mutually coupled multi-link mechanisms (i.e., the first hinge and the second hinge) to convert the linear or rotational motion input by the drive device into a composite motion trajectory of the door body relative to the hull, which includes rotation and translation. This ensures that the hinge system supporting the door body is always hidden in the internal cavity of the door body and the hull structure throughout the entire movement, ultimately achieving a smooth and stable switch between "completely closed and flat surface" and "180° fully open".

[0064] The following details the specific working steps and kinematic principles of switching from the closed position to the open position (taking 180° opening as an example).

[0065] The door is flush with the hull surface, and the weathertight / watertight sealing strip is pressurized for sealing. All units of the first hinge 1 and the second hinge 2 are retracted into the space between the door and the hull structure. The drive device (such as a hydraulic cylinder) is in a retracted or extended state (depending on the installation design).

[0066] When the drive device 5 starts to operate (for example, when the cylinder piston rod extends), the driving force of the drive device 5 acts directly on the drive mounting part on the second hinge unit 12 of the first hinge.

[0067] The second hinge unit 12 acts as the active rocker arm, and begins to rotate around the first sub-hinge axis 141, which is connected to the first hinge unit 11. The rotation of the second hinge unit 12 of the first hinge 1 pushes the third hinge unit 13 through the second sub-hinge axis 142, wherein the third hinge unit 13 moves accordingly, and the third hinge unit 13 pulls or pushes the sixth hinge unit 23 of the second hinge through a connecting shaft 3.

[0068] The third hinge unit 13 acts on the fourth hinge unit 21 of the second hinge via a second hinge shaft 142. The second hinge 2 responds to the combined motion of the door body and starts moving. Since the fourth hinge unit 21 is fixed to the door body, the force from the third hinge unit 13 causes it to begin to generate a tendency to translate outward and rotate.

[0069] The sixth hinge unit 23 begins to move synchronously under the drive from the first hinge (via connecting shaft 3) and the constraints of itself, the fifth hinge unit 22, and the fourth hinge unit 21. It drives the fifth hinge unit 22 through the fifth sub-hinge shaft 242.

[0070] The movement of the fifth hinge unit 22 further constrains and guides the movement trajectory of the fourth hinge unit 21.

[0071] At this point, the entire system enters a state of fully coordinated motion. The first hinge 1 (mainly composed of units 11, 12, and 13) acts as an active motion generator, transmitting power and specific motion laws to the second hinge 2 (mainly composed of units 21, 22, and 23) through two connecting shafts (3).

[0072] The second hinge 2, as a motion execution and amplification mechanism, transforms the received motion into the spatial motion trajectory of the fourth hinge unit (21) (i.e., the door itself) according to its own link ratio and constraint relationship.

[0073] As the door rotates outward to open, its center of gravity and hinge connection point also move outward. This allows the door to avoid interference with itself and the edge of the hull, gradually rotating and unfolding from a position flush with the hull to a position 180 degrees from the original closing plane.

[0074] When the drive unit reaches its maximum stroke, the door rotates to a fully open state, forming a 180° angle with the initial closing plane. At this point, each unit of the first hinge 1 and the second hinge 2 extends into a pre-designed, stable geometric configuration. The entire hinge assembly remains completely positioned between the back of the door and the hull structure, without protruding beyond the smooth outer surface of the hull.

[0075] To ensure safety, bolts or locking pins can be inserted into the locking holes (122) on the second hinge unit 12 to make the door rigidly connected to the hull structure in the open state, preventing accidental closure due to waves or drive system failure.

[0076] The closing process is the reverse of the above steps, that is, the drive device 5 moves in the opposite direction, and each link returns along the same trajectory under the action of the reverse driving force, finally retracting and stacking all the hinge units, so that the door body fits smoothly against the hull, the sealing strip is compressed, and the weathertight / watertight state is restored.

[0077] The concealed hinge decouples and then reassembles the rotational and translational motions through the coupling of two sets of hinges, so that the door has an outward opening motion during the opening process, creating conditions for itself to rotate 180°, while avoiding the hinges from being exposed.

[0078] The third hinge unit (13) and the fourth hinge unit (21) guide the door to move along a predetermined internal trajectory, rather than simply rotating the door around a fixed, exposed axis as is the case with traditional external hinges.

[0079] The concealed hinge in this application transforms linear drive into a precise, spatial concealed motion trajectory through a dual-coupled multi-link mechanism.

[0080] Refer to the accompanying drawings in this application specification. Figure 1 and Figure 2 As shown, a door drive system with a concealed hinge according to a second preferred embodiment of this application is described below. The door drive system includes the complete concealed hinge 100 described in Embodiment 1, and a matching drive device 5. The drive device 5 is preferably a hydraulic cylinder, with its cylinder body hinged to a robust base on the hull structure, and its piston rod hinged to a drive mounting portion 121 on the second hinge unit 12 of the first hinge 1. The extension and retraction of the cylinder can be precisely controlled via the ship's hydraulic control system or a local control valve group, thereby achieving smooth and reliable power opening and closing of the door. This system combines innovative mechanical mechanisms with mature power technology, providing a complete and automated solution.

[0081] According to another aspect of this application, a vessel 300 is further provided, which is equipped with the aforementioned concealed hinge 100 or door drive system 200. The vessel 300 has an ROV hangar on its side, the hangar opening of which is closed by one or more ROV doors 301. The ROV doors 301 are connected to the hull structure 302 via at least one set of concealed hinges 100 and are driven by corresponding drive systems 200. When the ROV doors 301 are closed, they are flush with the hull plating, and weathertight or watertight sealing strips are pressed tightly to ensure the airtightness of the compartment, with no visible protrusions.

[0082] When the ROV needs to be released or retrieved, the drive system 200 is activated, and the ROV door 301 smoothly opens to a fully extended 180° along a predetermined trajectory and is secured by the locking mechanism. At this time, the ROV passageway is wide and unobstructed, and the hinge mechanism is completely invisible.

[0083] This design is not only applicable to ROV doors, but can also be extended to other weatherproof or watertight doors that require high sealing performance, large openings for access, and an emphasis on appearance, demonstrating its broad application prospects and technical versatility.

[0084] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A concealed hinge, characterized in that, include: The first hinge is used to be installed on the hull structure; The second hinge is used to install on the door; And the connecting shaft that connects the first hinge and the second hinge; The first hinge includes a first hinge unit, a second hinge unit, a third hinge unit, and at least two first hinge axes, wherein the first hinge axes are used to connect the first hinge unit, the second hinge unit, and the third hinge unit. The second hinge includes a fourth hinge unit, a fifth hinge unit, a sixth hinge unit, and at least two second hinge axes, the second hinge axes being used to connect the fourth hinge unit, the fifth hinge unit, and the sixth hinge unit.

2. The concealed hinge according to claim 1, characterized in that: The first hinge unit is used to be fixedly mounted on the hull structure; The fourth hinge unit is used to be fixedly mounted on the door; The second hinge unit is connected to the third hinge unit via the connecting shaft; The third hinge unit is connected to the sixth hinge unit via the connecting shaft, and is connected to the fourth hinge unit via a second hinge shaft.

3. The concealed hinge according to claim 2, characterized in that, The first hinge unit and / or the fourth hinge unit are plate-shaped structures with a welding surface on one side for welding and fixing.

4. The concealed hinge according to claim 1, characterized in that, The connecting shaft, the first hinge shaft, and / or the second hinge shaft are either long or short shafts.

5. The concealed hinge according to claim 4, characterized in that, When the connecting shaft or hinge shaft is a long shaft, its length is greater than the combined thickness of the first hinge and the second hinge at the connection position of the shaft.

6. The concealed hinge according to claim 1, characterized in that, The second hinge unit is provided with a mounting part for connecting to the drive device. The mounting part is provided with a locking hole for locking and fixing when the door is opened to a preset position.

7. The concealed hinge according to claim 6, characterized in that, The locking hole is a threaded hole or a pin hole, and its axis is parallel to the axis of the hinge shaft at the mounting part.

8. The concealed hinge according to claim 1, characterized in that, A washer is provided at at least one of the following connections: the connection between the second hinge unit and the drive device, the connection between the fifth hinge unit and the fourth hinge unit, the connection between the sixth hinge unit and the first hinge unit, and the connection between the sixth hinge unit and the third hinge unit.

9. A gate drive system, characterized in that, include: Concealed hinge as described in any one of claims 1 to 8; The device includes a drive mechanism connected to the second hinge unit of the first hinge, which drives the movement of the concealed hinge to open or close the door.

10. The door drive system according to claim 9, characterized in that, The driving device is a hydraulic cylinder, a pneumatic cylinder, or an electric drive device.

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