Double-latch type cabin door locking mechanism and locking method thereof

Abstract

The invention relates to the technical field of cabin door structural parts, in particular to a double-latch type cabin door locking mechanism and a locking method thereof.The locking mechanism is arranged on a cabin door structure and used for locking the cabin door structure and a fuselage structure, and the locking mechanism comprises a cabin door connecting plate, a double-latch structure, a transmission structure and a locking structure; the transmission structure comprises a sliding rail, a sliding block and a connecting shaft, the sliding rail is in an arc shape, a locking hole is formed in the sliding rail, the connecting blocks are arranged at the ends of the double-latch structure, the sliding rail is arranged between the two connecting blocks, the sliding block is arranged on the sliding rail in a sliding mode, and the locking structure is movably arranged on the connecting shaft and matched with the locking hole. Through the transmission structure, the sliding block slides under the inclined condition of the arc-shaped curved surface so that the double-latch structure can horizontally move upwards, and the problems that due to the fact that a traditional multi-connecting-rod mechanism is long in transmission route, friction resistance is large, and occupied space is large are solved; and meanwhile, the arc-shaped sliding rail-sliding block mechanism is adopted, so that the opening and closing torque of the cabin door is stable and controllable.

Description

Technical Field

[0001] The present invention relates to the technical field of hatch door structural components, and in particular to a double-latch hatch door locking mechanism and a locking method thereof. Background Art

[0002] The cabin door is a critical component of civil aircraft and a major factor affecting flight safety. During high-altitude cruising, cabin pressurization is essential to ensure passenger comfort. The resulting pressure differential between the cabin door and the fuselage frame creates a strong force, which can lead to significant deformation. Furthermore, the vibrations caused by unstable airflow further exacerbate door deformation or fatigue, creating safety hazards and even serious accidents, such as cabin decompression and door detachment.

[0003] For example, numerous flight safety accidents involving cabin doors have occurred in countries such as the United States, Canada, and India. Cabin doors have attracted significant attention in civil aircraft. To increase cabin door safety margins, and given constraints such as aircraft weight and manufacturing costs, most designs employ multi-link mechanisms or composite mechanisms combining multiple links and cams. Generally speaking, existing cabin door locking mechanisms suffer from long transmission paths, incompact mechanical configurations, and high operating forces or torques. Therefore, selecting a reasonable and feasible mechanical configuration is a primary priority in cabin door design. Summary of the Invention

[0004] The main purpose of the present invention is to provide a double-latch door locking mechanism and a locking method thereof, aiming to solve the problem of large resistance fluctuation caused by the long transmission line of the traditional multi-link mechanism.

[0005] To achieve the above objectives, the present invention provides a double-latch door locking mechanism, which is provided on the door structure and is used to lock the door structure with the fuselage structure. The locking mechanism includes: A door connecting plate connected to the door structure; A double latch structure, slidably arranged on the hatch connecting plate; a transmission structure, provided on the hatch door connecting plate and used for moving the double latch structure up and down on the hatch door connecting plate; A locking structure, provided on the transmission structure and used for locking the transmission structure; Among them, the transmission structure includes a slide rail, a slider and a connecting shaft. The slide rail is arc-shaped and is provided with a locking hole. The end of the double-latch structure is provided with a connecting block. The slide rail is provided between the two connecting blocks. The slider is slidably provided on the slide rail. The locking structure is movably provided on the connecting shaft and cooperates with the locking hole.

[0006] Optionally, two connecting bosses are provided on the hatch connecting plate, the double-latch structure includes a door latch slidably arranged with the connecting bosses, the connecting block is fixedly connected to the door latch, and the locking mechanism can also be detachably connected to the handle on the locking structure, and the locking and unlocking of the locking structure on the locking hole are controlled by the handle.

[0007] Optionally, the locking structure includes a sliding bearing and a guide block, the guide block is connected to the slider through the sliding bearing, the handle is arranged on the guide block, a fixing hole is provided on the guide block, and a fixing pin matching the fixing hole is provided at the end of the handle.

[0008] Optionally, one end of the handle is used to cooperate with the locking hole to lock the slider and the slide rail.

[0009] Optionally, the transmission structure further includes a guide rod, one end of which is connected to the connecting shaft, and the other end of which is connected to the guide block.

[0010] Optionally, the cross section of the slide rail is I-shaped, and the slide rail is eccentrically arranged with respect to the connecting shaft.

[0011] Optionally, the hatch connecting plate is detachably connected to the hatch structure, and when disassembled, is used to complete offline inspection of the locking mechanism.

[0012] Optionally, a preload member is provided on the guide block, and the preload member is used to adjust the preload force of the sliding bearing.

[0013] Optionally, when the handle is axially matched with the locking hole, the fixing hole and the fixing pin are synchronously matched.

[0014] To achieve the above object, the present invention further provides a locking method, which comprises the following steps: Connecting the handle to the guide block and pushing the guide block to rotate along the axis of the connecting shaft; After the guide block reaches the locking position, the handle is inserted along its axial direction and matched with the locking hole to complete the locking process.

[0015] The beneficial effects that can be achieved by the present invention are as follows: A double-latch door locking mechanism proposed in the present invention improves the transmission route of the traditional multi-link mechanism into a curved surface transmission. Specifically, the arc-shaped slide rail and the slider slidingly arranged thereon constitute a curved surface transmission, which converts rotational motion into linear displacement and shortens the transmission path. In addition, the locking hole provided on the slide rail is plugged into the connecting shaft through the locking structure to form a purely mechanical lock, which can achieve stable locking without relying on elastic elements. For the curved surface transmission locking process, the slider is caused to slide under the inclination of the arc surface through the transmission structure to move the double-latch structure horizontally upward. Compared with the traditional multi-link structure, the locking process can also be achieved with a shorter transmission route, which solves the problems of large friction resistance and large space occupied by the long transmission route of the traditional multi-link mechanism; at the same time, the arc-shaped slide rail-slider mechanism adopted realizes the stability and controllability of the door opening and closing torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the overall structure of the locking mechanism in an embodiment of the present invention; Figure 2 This is a schematic diagram of the axial structure of the locking mechanism in an embodiment of the present invention; Figure 3 A schematic diagram of a connection structure between a locking structure and a transmission structure in an embodiment of the present invention; Figure 4 This is another schematic diagram of a connection structure between the locking structure and the transmission structure in an embodiment of the present invention; Figure 5 A schematic structural diagram of a guide block in an embodiment of the present invention; Figure 6 This is a schematic structural diagram of a handle in an embodiment of the present invention; Figure 7 Schematic diagram of the structure of the slide rail in an embodiment of the present invention.

[0017] Reference numerals: 1-locking mechanism, 2-door structure, 3-fuselage structure; 11-door connecting plate, 12-double latch structure, 13-transmission structure, 14-locking structure; 111-connecting boss; 121-door latch, 122-connecting block; 131-slide rail, 132-slider, 133-connecting shaft, 134-handle, 135-guide rod; 141-locking hole, 142-sliding bearing, 143-guide block, 144-fixing hole, 145-fixing pin, 146-preload member.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] It should be understood that in the present application, the rotating, sliding, meshing and other moving parts are well lubricated, and their outsides are provided with corresponding protective shells. However, in the drawings of the present application, in order to clearly indicate the connection status of the moving parts, they are not shown. It can also be understood that each component in the present application is made of metal or plastic materials with adaptable strength in the field to which it belongs to ensure that its structural rigidity meets actual needs.

[0024] Example 1: Please refer to the attached Figures 1 to 7 In this embodiment, a double-latch door locking mechanism 1 is provided. The locking mechanism 1 is provided on a door structure 2 and is used to lock the door structure 2 with a fuselage structure 3. The locking mechanism 1 includes: A door connecting plate 11 connected to the door structure 2; A double latch structure 12 is slidably disposed on the door connecting plate 11; The transmission structure 13 is provided on the door connecting plate 11 and is used for the double latch structure 12 to move up and down on the door connecting plate 11; A locking structure 14 is provided on the transmission structure 13 and is used to lock the transmission structure 13; Among them, the transmission structure 13 includes a slide rail 131, a slider 132 and a connecting shaft 133. The slide rail 131 is arc-shaped and is provided with a locking hole 141. The end of the double-latch structure 12 is provided with a connecting block 122. The slide rail 131 is provided between the two connecting blocks 122. The slider 132 is slidably provided on the slide rail 131. The locking structure 14 is movably provided on the connecting shaft 133 and cooperates with the locking hole 141.

[0025] It should be noted that most of them adopt a multi-link mechanism configuration or a composite mechanism of a multi-link and a cam; in general, the existing door locking mechanism 1 has problems such as a long transmission path, an incompact mechanism configuration, and a large operating force or torque. Based on the above problems, this embodiment provides a double-latch door locking mechanism 1, which improves the transmission path of the traditional multi-link mechanism to a curved surface transmission. Specifically, the arc-shaped slide rail 131 and the slider 132 slidingly arranged thereon constitute a curved surface transmission, which converts the rotational motion into a linear displacement, thereby shortening the transmission path. In addition, the locking hole 141 provided on the slide rail 131 By plugging and fitting the locking structure 14 with the connecting shaft 133, a purely mechanical locking is formed, and stable locking can be achieved without relying on elastic elements. For the curved transmission locking process, the transmission structure 13 is used to make the slider 132 slide under the inclination of the arc surface to make the double latch structure 12 move horizontally upward. Compared with the traditional multi-link structure, the locking process can also be achieved with a shorter transmission route, which solves the problem of large resistance fluctuations caused by the long transmission route of the traditional multi-link mechanism; at the same time, the arc-shaped slide rail 131-slider 132 mechanism is adopted to achieve stable and controllable opening and closing torque of the hatch.

[0026] It should also be noted that when the transmission structure 13 is operated, the connecting shaft 133 drives the locking structure 14 while driving the slider 132 to move in a curve along the slide rail 131. This asymmetric transmission path accurately converts the rotational motion into the vertical displacement of the double latch. The double latch structure 12 forms a symmetrical force system with the slide rail 131 through the connecting blocks 122 at both ends, and always maintains synchronous displacement during the movement process, completely eliminating the overload problem of single-point locking. In addition, the movement process of the traditional multi-link mechanism has far more than 3 moving pairs, while the transmission structure in this application has only 3 key moving pairs, namely the sliding pair of the slider 132 and the slide rail 131, the rotating pair of the connecting shaft 133 and the guide block 143, and the sliding pair of the door latch 121 and the connecting boss 111, which greatly reduces the transmission route. The vertical displacement brought about by the eccentric setting solves the problems of high friction resistance and large space occupied due to the long transmission route of the traditional multi-link mechanism.

[0027] In this embodiment, two connecting bosses 111 are provided on the hatch connecting plate 11, and the double-latch structure 12 includes a latch 121 slidingly arranged with the connecting boss 111, and the connecting block 122 is fixedly connected to the latch 121. The locking mechanism 1 can also be detachably connected to the handle 134 on the locking structure, and the locking and unlocking of the locking structure 14 on the locking hole 141 are controlled by the handle 134.

[0028] Theoretically, the multi-link and cam compound mechanism still has the following deficiencies: First of all, from the perspective of the mechanism principle, the transmission route is relatively long, and most of the components are slender rods. The movement law of the terminal components is difficult to control, which is manifested in a large fluctuation amplitude of the resistance or resistance torque, and the slender rods are prone to deformation, which affects the locking effect, sealing effect and safety of the hatch.

[0029] Secondly, for multi-link mechanisms, adjusting the configuration parameters is cumbersome and time-consuming. Improperly designed configuration parameters can lead to unusual configurations and deadlocks in certain locations, affecting the proper opening and closing of the hatch. For cam-type composite mechanisms, profile design not only incurs significant costs but also inevitably leads to contact wear, increasing the difficulty of hatch opening and closing. In an emergency evacuation, the inability of the hatch to function properly presents a significant safety hazard.

[0030] In particular, when faced with numerous design constraints, it is often difficult to determine a suitable multi-link mechanism configuration. Both the design and performance analysis of multi-link mechanisms are challenging, and sometimes even an effective analytical solution is impossible to obtain. Finally, due to the large number of components and long transmission paths in multi-link mechanisms, transmission efficiency is often low, and the structure is not compact enough, making troubleshooting and troubleshooting time-consuming and labor-intensive.

[0031] Based on the above issues, the latches 121 on both sides of the dual-latch structure 12 are fixedly connected to the ends of the curved slide rail 131 via connecting blocks 122. The I-shaped cross-section of the slide rail 131 not only enhances the bending rigidity of the slide rail 131, but also, through the geometric characteristics of its curved surface, converts the torque input by the rotation of the handle 134 into the curved sliding of the slider 132 along the slide rail 131. During this process, the sliding movement of the slider 132 is transmitted to the guide block 143 via the guide rod 135 and the connecting shaft 133, thereby driving the latch 121 of the dual-latch structure 12 to move vertically under the guidance of the connecting boss 111, ultimately completing the locking with the fuselage structure 3.

[0032] By simplifying the complex transmission of the multi-link mechanism into a single degree of freedom motion of the slide rail 131-slider 132, the transmission path is greatly shortened, reducing the friction loss and resistance fluctuations caused by the long transmission chain of the traditional multi-link mechanism. At the same time, the symmetrical layout and synchronous movement of the double latch structure 12 eliminate the problem of overloading during single-point locking, avoid wear or deformation caused by local stress concentration, and thus improve the reliability and durability of the locking mechanism 1. In addition, the handle 134 is fixed to the guide block 143 through a detachable connection, and the fixing pin 145 at the end of the handle 134 cooperates with the fixing hole 144 on the guide block 143 to form a purely mechanical lock. Without relying on elastic elements, the stability of the locking state is ensured by the rigid cooperation between the pin and the locking hole 141, and the locking force can be kept constant even under vibration or impact loads, effectively solving the problem of locking failure caused by contact wear in traditional cam mechanisms.

[0033] In addition, the axial insertion of handle 134, in conjunction with the locking hole 141, and the arcuate trajectory of guide block 143 during rotation, enable two-stage control of the locking process: in the first stage, handle 134 pushes guide block 143 to rotate, driving slider 132 along rail 131 to lift latch 121 to the locked position; in the second stage, fixed pin 145 is inserted into locking hole 141 to complete the final locking. This phased operation not only reduces the instantaneous operating torque but also prevents accidental unlatching through a mechanical interlocking mechanism, significantly improving safety. Similarly, the detachable design of door connecting plate 11 and door structure 2 allows the entire locking mechanism 1 to be inspected and maintained offline, solving the problem of difficult maintenance caused by the complex structure of traditional multi-link mechanisms.

[0034] In this embodiment, the locking structure 14 includes a sliding bearing 142 and a guide block 143. The guide block 143 is connected to the slider 132 through the sliding bearing 142. The handle 134 is arranged on the guide block 143. A fixing hole 144 is provided on the guide block 143. The end of the handle 134 is provided with a fixing pin 145 matching the fixing hole 144.

[0035] Guide block 143 is connected to slider 132 via sliding bearing 142. The low friction of sliding bearing 142 ensures smooth movement of slider 132 along curved rail 131, effectively reducing energy loss caused by friction between the multiple moving parts in a traditional multi-link mechanism. As a core transmission component, guide block 143 is connected to slider 132 via sliding bearing 142 rather than a rigid connection. This maintains the required rigidity of the transmission while dispersing local contact stresses through the rolling or sliding action of the bearing, thus avoiding the rapid wear caused by point or line contact in traditional cam or linkage mechanisms.

[0036] Furthermore, a fixing hole 144 in the guide block 143 cooperates with a fixing pin 145 at the end of the handle 134, forming a purely mechanical locking mechanism. When the handle 134 pushes the guide block 143 to rotate along the connecting shaft 133, the arcuate motion of the slider 132 is precisely translated into vertical displacement of the double latch structure 12. The final stage of the locking process is achieved by inserting the fixing pin 145 into the locking hole 141, completing the rigid locking. This rigid fit of the mechanical latch ensures the stability of the locking force under vibration, impact, and internal and external pressure differentials, completely eliminating the problem of locking force attenuation caused by elastic element fatigue or temperature changes.

[0037] In some embodiments, one end of the handle 134 is configured to engage with the locking hole 141 to lock the slider 132 to the slide rail 131. Since the moving surfaces of the slider 132 and the slide rail 131 are parallel to the door connecting plate 11, the axial locking of the handle 134 can effectively prevent the two from having a corresponding locking offset.

[0038] In this embodiment, the transmission structure 13 further includes a guide rod 135 , one end of the guide rod 135 is connected to the connecting shaft 133 , and the other end of the guide rod 135 is connected to the guide block 143 .

[0039] As will be appreciated, one end of guide rod 135 is fixedly connected to connecting shaft 133, and the other end is hingedly connected to guide block 143, forming a composite transmission path. When handle 134 drives guide block 143 to rotate about connecting shaft 133, guide rod 135 converts the rotational motion of guide block 143 into a push-pull force along its axial direction. This force is then transmitted to slider 132 via connecting shaft 133, forcing slider 132 to slide along the I-shaped track of arcuate slide rail 131. During this process, the rigid structure of guide rod 135 ensures linear force transmission, avoiding energy loss at multiple hinge points in traditional multi-link mechanisms.

[0040] The geometric characteristics of the curved slide rail 131, in concert with the length and angle of the guide rod 135, precisely translate the curved motion of the slider 132 into the vertical displacement of the dual-latch mechanism 12. The introduction of the guide rod 135 simplifies the complex linkage of multiple rods in a traditional multi-link mechanism into the directional motion of a single rigid rod, significantly shortening the transmission path and significantly reducing the frictional resistance and inertial fluctuations caused by a long transmission chain. Furthermore, the fixed connection between the guide rod 135 and the connecting shaft 133 enhances transmission rigidity, preventing motion deviation caused by gap accumulation in traditional hinged connections and ensuring synchronized lifting of the latches 121 on both sides of the dual-latch mechanism 12. This synchronization is further enhanced by the symmetrical layout of the connecting blocks 122 and the slide rail 131 at each end of the dual-latch mechanism 12, completely eliminating the phenomenon of unbalanced loading during unilateral locking and avoiding component deformation or wear caused by localized stress concentration, thereby improving the reliability and service life of the locking mechanism 1.

[0041] In this embodiment, the cross section of the slide rail 131 is I-shaped, and the slide rail 131 and the connecting shaft 133 are eccentrically disposed.

[0042] It is understandable that the center of the slide rail 131 is not on the axis of the connecting shaft 133, that is, the vertical displacement caused by the eccentric setting of the slide rail 131 and the connecting shaft 133 solves the problems of large friction resistance and large space occupied due to the long transmission route.

[0043] It can also be understood that the I-shaped slide rail 131 is composed of upper and lower parallel edge strips and vertically connected webs. This cross-sectional form achieves the optimal distribution of moment of inertia in material distribution. The upper edge strip and the lower edge strip are rigidly connected by the web to form a closed box-type bending-resistant structure, which significantly improves the bending stiffness and torsional resistance of the slide rail 131 on the arc path; when the slider 132 moves along the slide rail 131, the edge strip of the I-shaped section bears the main normal load, while the web resists shear force and torsional moment, effectively suppressing the local deformation of the slide rail 131 due to uneven force or external impact.

[0044] Furthermore, a weight-reducing hole or reinforcing rib can be provided in the middle of the web of the I-shaped rail 131, achieving lightweight construction while maintaining rigidity. This reduces the overall mass of the locking mechanism 1 and meets the strict weight reduction requirements of the aviation industry. The upper and lower flanges of the rail 131 also serve as mounting reference surfaces, precisely aligning with the locating pins or bolt holes on the door connecting plate 11. This simplifies the assembly process and avoids the cumulative installation errors associated with the irregular cross-section of conventional curved rails 131.

[0045] In this embodiment, the door connecting plate 11 is detachably connected to the door structure 2 , and when disassembled, is used to complete the offline inspection of the locking mechanism 1 .

[0046] It is understandable that the detachable modular design enables the locking mechanism 1 to be inspected offline as a whole, thus avoiding the micro-level fitting gaps caused by repeated disassembly and assembly in traditional structures.

[0047] In this embodiment, a preload member 146 is provided on the guide block 143, and the preload member 146 is used to adjust the preload force of the sliding bearing 142. When the sliding bearing 142 has wear gaps due to long-term use, the initial preload state can be restored by rotating the adjustment bolt of the preload member 146.

[0048] In some embodiments, the latch 121 is a thin-walled cylindrical tube structure, and the door connecting plate 11 adopts a thin plate with a lightening groove design.

[0049] In some embodiments, the hatch connecting plate 11 realizes connection or disassembly of the locking mechanism 1 and the hatch through six connecting bolts arranged symmetrically on the left and right.

[0050] In some embodiments, the pre-tightening member 146 is preferably a screw.

[0051] In some embodiments, when the handle 134 is axially engaged with the locking hole 141, the fixing hole 144 and the fixing pin 145 are also engaged. Since the handle 134 may rotate axially in the direction of its axis under the action of external force when axially locked, the plug-in fixing action of the fixing hole 144 and the fixing pin 145 can effectively prevent axial rotation.

[0052] Example 2: A locking method, comprising the following steps: Connect the handle 134 to the guide block 143 and push the guide block 143 to rotate along the axis of the connecting shaft 133; After the guide block 143 reaches the locking position, the handle 134 is inserted along its axial direction and matched with the locking hole 141 to complete the locking process.

[0053] In this embodiment, during the rotation of the guide block 143 , the slider 132 moves along the arc surface of the slide rail 131 , so that the latch 121 moves upward along its axial direction on the connecting boss 111 and is locked with the fuselage structure 3 .

[0054] In this embodiment, after the locking process is completed, the fixing hole 144 is engaged with the fixing pin 145 .

[0055] In some embodiments, in order to achieve reliable fixation of the sliding bearing 142, two symmetrically arranged screw connection holes are designed on the guide block 143, and the bearing is fixed to the guide block 143 by two screws.

[0056] During implementation, the operator first quickly inserts handle 134 through the shaft-to-hole connection, forming a rigid connection between handle 134 and guide block 143. Pushing handle 134 causes guide block 143 to rotate about the axis of connection shaft 133, its motion trajectory precisely controlled by the arc-shaped geometry of rail 131. During this process, slider 132 slides along the curved surface of I-shaped rail 131, converting the rotational motion into vertical displacement of latch 121 via guide rod 135, causing latch 121 to move upward and lock with door structure 2.

[0057] Based on the above process, it can be understood that the locking process is divided into two core stages: the first stage is the rotation of guide block 143 to drive the displacement of latch 121, and the second stage is the axial insertion of handle 134 to complete the rigid locking. After the handle 134 forms a removable rigid connection with the guide block 143 through the shaft hole, the operator pushes the handle 134 to rotate about the axis of the connecting shaft 133. At this time, the guide block 143 serves as the core transmission component, and its rotational motion is transmitted to the slider 132 through the guide rod 135, forcing the slider 132 to slide along the curved surface of the I-shaped slide rail 131. The I-shaped cross-section design of the slide rail 131, through the combination of upper and lower flanges and the web, forms a high-rigidity, bending-resistant structure, ensuring that the slide rail 131 does not deform when the slider 132 is subjected to the lifting load of the latch 121, thereby maintaining the accuracy of the motion trajectory. The sliding motion of slider 132 is further linked to the connecting block 122 of the dual-latch structure 12 via connecting shaft 133, driving the latches 121 on both sides to move vertically upward along the connecting bosses 111 on the door connecting plate 11 until the tops of the latches 121 precisely align with the locking grooves of the fuselage structure 3. During this process, the rigid connection characteristics of guide rod 135 efficiently convert rotational motion into linear displacement, avoiding the energy loss and motion deviation caused by the multiple hinge points in traditional multi-link mechanisms. Furthermore, the symmetrical layout of the dual-latch structure 12, through the synchronous movement of the connecting blocks 122 at both ends of the slide rail 131, completely eliminates the phenomenon of biased loading during unilateral locking, ensuring even distribution of locking force.

[0058] During the second stage of locking, when the guide block 143 rotates to the preset locking position, the operator applies an axial thrust along the handle 134, causing the securing pin 145 at the end of the handle 134 to rigidly engage the locking hole 141 on the slide rail 131. This design replaces traditional locking mechanisms that rely on springs or elastic elements with a purely mechanical locking mechanism, addressing the issue of locking force loss due to elastic element fatigue or temperature fluctuations. The position of the locking hole 141 strictly aligns with the curved path of the slide rail 131, ensuring that the securing pin 145 can be inserted only when the latch 121 is fully in place, forming a mechanical interlocking mechanism to prevent misoperation. To ensure reliable securing of the sliding bearing 142, two symmetrically arranged screw holes on the guide block 143 secure the sliding bearing 142 to the guide block 143 through high-precision threaded engagement. This symmetrical screw arrangement not only balances the forces acting on the bearing but also, through preload adjustment, prevents fluctuations in the clearance between the bearing and the slide 132, ensuring smooth movement of the slide 132 along the slide rail 131.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A double-latch door locking mechanism, characterized in that: The locking mechanism is provided on the door structure and is used to lock the door structure with the fuselage structure. The locking mechanism comprises: A door connecting plate connected to the door structure; A double latch structure, slidably arranged on the hatch connecting plate; a transmission structure, disposed on the hatch connecting plate and used to drive the double latch structure to move up and down on the hatch connecting plate; A locking structure, provided on the transmission structure and used for locking the transmission structure; Among them, the transmission structure includes a slide rail, a slider and a connecting shaft. The slide rail is arc-shaped and is provided with a locking hole. The end of the double-latch structure is provided with a connecting block. The slide rail is provided between the two connecting blocks. The slider is slidably provided on the slide rail. The locking structure is movably provided on the connecting shaft and cooperates with the locking hole.

2. A double-latch door locking mechanism according to claim 1, characterized in that: Two connecting bosses are provided on the hatch connecting plate, the double-latch structure includes a door latch slidably arranged with the connecting bosses, the connecting block is fixedly connected to the door latch, and the locking mechanism also includes a handle detachably connected to the locking structure, and the locking and unlocking of the locking structure on the locking hole are controlled by the handle.

3. A double-latch door locking mechanism according to claim 2, characterized in that: The locking structure includes a sliding bearing and a guide block, the guide block is connected to the slider through the sliding bearing, the handle is arranged on the guide block, a fixing hole is provided on the guide block, and a fixing pin matching the fixing hole is provided at the end of the handle.

4. A double-latch door locking mechanism according to claim 3, characterized in that: One end of the handle is used to cooperate with the locking hole to lock the slider and the slide rail.

5. The double-latch door locking mechanism according to claim 3, wherein: The transmission structure further comprises a guide rod, one end of which is connected to the connecting shaft, and the other end of which is connected to the guide block.

6. A double-latch door locking mechanism according to claim 3 or 5, characterized in that: The cross section of the slide rail is I-shaped, and the slide rail is eccentrically arranged with respect to the connecting shaft.

7. A double-latch door locking mechanism according to claim 3, characterized in that: The door connecting plate is detachably connected to the door structure and is used to complete the offline inspection of the locking mechanism when it is disassembled.

8. The double-latch door locking mechanism according to claim 3, wherein: The guide block is provided with a preload component, and the preload component is used to adjust the preload force of the sliding bearing.

9. A double-latch door locking mechanism according to claim 4, characterized in that: When the handle is axially matched with the locking hole, the fixing hole and the fixing pin are synchronously matched.

10. A locking method, characterized in that: A double-latch door locking mechanism according to any one of claims 3 to 9, wherein the method comprises the following steps: Connecting the handle to the guide block and pushing the guide block to rotate along the axis of the connecting shaft; After the guide block reaches the locking position, the handle is inserted along its axial direction and matched with the locking hole to complete the locking process.

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