Quick-release type suspension structure of airplane cabin door

Abstract

The utility model belongs to the field of airplane structural design, and relates to a quick-release suspension structure for an airplane cabin door. The quick-release type suspension structure comprises a door frame support, two sets of suspension connector assemblies, a locking rocker arm, a handle transmission mechanism, a cross beam, a locking spring, a cabin door structure and a cabin door frame. The suspension joint assembly consists of a rotating shaft, a rotating joint, a fixed joint, a rotary spring, a roller, a joint support, a stop rocker arm, a shaft seat, a transverse shaft and a spring hook; the handle transmission mechanism is composed of a handle, a handle shaft, an insertion lug, a guide piece, a pull rod, a main rocker arm, a support and a handle shaft support. The cabin door can be quickly disassembled and assembled by pulling the handle, the maintenance efficiency of the airplane cabin door is improved, tools are prevented from being used in the disassembly and assembly process, and the aims of conveniently and quickly disassembling and assembling the cabin door and saving the maintenance time are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of aircraft structural design and relates to a quick-release suspension structure for aircraft cabin doors. Background Technology

[0002] Aircraft doors provide access for personnel or cargo to and from the cabin, or for the installation and maintenance of equipment. The suspension joint, acting as the link between the door and the aircraft structure, provides a fulcrum for door rotation during opening, supports the door in the open position after opening, and locks the door with the locking mechanism when closed. Door maintenance requires disassembly of the door rotation joint to facilitate servicing. Therefore, the suspension joint must have a simple structure, be able to withstand various loads on the door, ensure flexible opening and closing, and be easy to maintain with high reliability.

[0003] Currently, most aircraft door suspension connectors use a combination of single-ear and double-ear connectors. Each connector has a rotating hole in the center of its lugs, with the rotating holes coaxial. A bushing is installed inside the hole, and the bushing and lug hole have an interference fit. The single-ear and double-ear connectors are connected by a pin, with a small clearance fit between the bushing and the pin. During installation, the double-ear connector is installed on the door, and the single-ear connector is installed on the door frame. The lugs of the single-ear connector are inserted into the lugs of the double-ear connector and connected by the pin. This design is simple in structure and has a straightforward force transmission path. However, each door maintenance requires disassembling the pin and its nuts and safety pins, resulting in poor maintenance convenience. Furthermore, when replacing the bushing after wear, a specially made bushing is required to ensure the interference fit between the bushing and the lug hole, increasing the difficulty of maintenance. Utility Model Content

[0004] Based on the design requirements of aircraft cabin door suspension joints and the problems existing in the prior art, the purpose of this utility model is to provide a quick-release suspension joint structure for aircraft cabin doors. This structure allows for rapid disassembly and installation of the cabin door by operating a handle, improving maintenance efficiency and eliminating the need for tools during disassembly and assembly. This achieves the goal of convenient and quick door removal and installation, saving maintenance time. Simultaneously, a locking spring transmits force to the locking rocker arm and the horizontal shaft, applying preload to the rotary joint. Even with joint wear, this ensures the joint remains in contact with the rotating shaft, guaranteeing reliable opening and closing of the cabin door.

[0005] The technical solution of this utility model:

[0006] A quick-release suspension structure for an aircraft cabin door, the quick-release suspension structure comprising: a door frame support 1, two sets of suspension joint assemblies 2, a locking rocker arm 3, a handle transmission mechanism 4, a crossbeam 5, a locking spring 6, a cabin door structure 7, and a cabin door frame 8.

[0007] The suspension joint assembly 2 consists of a rotating shaft 11, a rotary joint 12, a fixed joint 13, a rotary spring 14, a roller 15, a joint support 16, a stop rocker arm 17, a shaft seat 18, a horizontal shaft 19, and a spring hook 20.

[0008] The pivot 11 is the axis of rotation of the hatch, the rotary joint 12 is the movable part of the suspension joint, and the fixed joint 13 is the fixed part of the suspension joint. The semi-circular grooves on the end faces of the two parts combine to form a rotating hole, which cooperates with the pivot to realize the rotation of the hatch around the axis. The anti-rocker arm 17 is bolted to the horizontal shaft 19, and the semi-circular notch at the end contacts the roller 15 connected to the rotary joint 12, restricting the rotation of the rotary joint 12. The rotary spring 14 connects the rotary joint 12 and the spring hook 20 fixed on the hatch structure together, ensuring that the rotary joint 12 can rotate after the anti-rocker arm 17 is unlocked, so that the hatch can be disengaged from the pivot 11 and the hatch can be quickly disassembled. The joint support 16 and the shaft seat 18 are both bolted to the hatch structure to support the suspension joint assembly 2.

[0009] The door frame support 1 is connected to the hatch door frame 8 to support the suspension joint assembly 2; the two suspension joint assemblies 2 are connected together by the crossbeam 5, and a locking rocker arm 3 is connected in the middle of the pivot 11. The locking rocker arm 3 is connected together by the locking spring 6 and the spring hook 20 fixed on the hatch structure 7.

[0010] The handle transmission mechanism 4 consists of a handle 21, a handle shaft 22, a lug 23, a guide 24, a pull rod 25, a main rocker arm 26, a support 27, and a handle shaft support 28;

[0011] The handle 21 is used to rotate the lug 23 on the handle shaft 22, thereby driving the lever 25 to rotate the main rocker arm 26, which can control the locking and unlocking state of the stop rocker arm 17; the handle shaft support 28 is fixed on the hatch frame structure to support the handle shaft 22; the guide 24 and the support 27 are fixed on the hatch structure to support the lever 25 and the rotating shaft 11.

[0012] Furthermore,

[0013] The rotating shaft 11 has a structure in which a cylinder is sandwiched in the middle of a triangular plate. The triangular plate is connected to the door frame support 1 by bolts, and the cylinder is the rotation axis of the suspension joint assembly 2.

[0014] Furthermore,

[0015] The pointed end of the rotary joint 12 has a semi-circular groove, and the other end has two ears for connecting the roller 15. Near the upper part of the pointed end, there is a single ear for connecting the rotary spring 14.

[0016] Furthermore,

[0017] The upper surface of the fixed joint 13 is a semi-circular groove, which, together with the semi-circular groove of the rotary joint 12, forms a rotating hole, which cooperates with the rotating shaft 11 to realize the rotation of the hatch around the shaft.

[0018] Furthermore,

[0019] The upper end of the stop rocker arm 17 has a semi-circular notch that contacts the roller 15 connected to the rotary joint 12, thus restricting the rotation of the rotary joint 12. The lower end is connected to the horizontal shaft 19 by a tapered bolt.

[0020] Furthermore,

[0021] The horizontal shaft 19 is a hollow cylindrical part, which is installed on the bearing 18 connected to the hatch structure 7 to connect the two sets of suspension joint assemblies 2, and at the same time connects the handle transmission mechanism 4; the joint support 16 and the bearing 18 are both fixed to the hatch structure 7 by bolts to support the suspension joint assembly 2.

[0022] Furthermore,

[0023] The handle 21 controls the movement of the suspension joint assembly 2. It is a rod with a transverse circular hole at its large end, which is bolted to the handle shaft 22. The handle shaft 22 is a hollow cylindrical part, mounted on the handle shaft support 28 connected to the hatch frame 8. The large end of the lug 23 has a circular hole that connects to the handle shaft 22, and the other end is a single lug with a U-shaped notch, which connects to the double-lug connector on the pull rod 25. The pull rod 25 is a composite rod with double-lug connectors at both ends and a hollow cylinder in the middle, which allows for... The main rocker arm 26 is bolted together; the large end of the main rocker arm 26 has a round hole that connects to the horizontal shaft 19, and the other end has a single ear with a small hole that connects to the double-ear connector on the pull rod 25; the guide 24 is fixed to the hatch structure 7, is a fan-shaped connector with a round hole in the middle that passes through the pull rod 25, and is used to support and guide the pull rod 25; the support 27 is fixed to the hatch structure 7 and is used to support the rotating shaft 19; the handle shaft support 28 is fixed to the hatch frame 8 structure and is used to support the handle shaft 22.

[0024] Furthermore,

[0025] The locking rocker arm 3 has a round hole at its large end, which connects to the horizontal shaft 19. The other end has a single ear with a small hole, which connects to the hook of the locking spring 6. The crossbeam 5 is a channel beam, bolted to the rotary joint 12, connecting the two suspension joint assemblies into one unit for synchronous movement. The locking spring 6 is a tension spring, connecting the locking rocker arm 3 and the spring hook 20 fixed to the hatch structure 7, ensuring reliable contact between the stop rocker arm 17 and the roller 15, thus ensuring reliable locking of the stop rocker arm 17. In the event of wear on the rotary joint 12 or the fixed joint 13, the locking spring 6 transmits force to the stop rocker arm 17 through the locking rocker arm 3 and the horizontal shaft 19, applying preload to the rotary joint 12, ensuring that the rotary joint 12 and the rotating shaft 11 remain in contact, guaranteeing reliable opening and closing of the hatch.

[0026] Compared with the prior art, the advantages of this utility model are: 1) The structure formed by the combination of the rotary joint and the semi-circular groove on the end face of the fixed joint to form a rotating hole that matches the rotating shaft realizes the quick separation and connection of the hatch and the rotating shaft; 2) The locking spring applies a preload to the rotary joint through the rocker arm, providing design compensation in the case of joint wear, so that the joint and the rotating shaft are always in contact, ensuring that the hatch can be opened and closed reliably; 3) No tools are needed during the disassembly and assembly of the hatch, only the handle needs to be turned, which achieves the purpose of convenient and quick disassembly and assembly of the hatch and saves maintenance time. Attached Figure Description

[0027] The present invention will be further described in detail below with reference to the accompanying drawings of the embodiments.

[0028] Figure 1 This is a schematic diagram of a quick-release suspension joint structure for an aircraft cabin door.

[0029] Figure 2 This is a schematic diagram of the suspension joint assembly;

[0030] Figure 3 This is a cross-sectional view of the suspension joint assembly structure;

[0031] Figure 4 This is a schematic diagram of the handle transmission mechanism;

[0032] Figure 5 This is a schematic diagram of the suspension joint assembly in the open state;

[0033] The numbers in the diagram are explained as follows: 1. Door frame support; 2. Suspension joint assembly; 3. Locking rocker arm; 4. Handle transmission mechanism; 5. Crossbeam; 6. Locking spring; 7. Door structure; 8. Door frame; 11. Rotary shaft; 12. Rotary joint; 13. Fixed joint; 14. Rotary spring; 15. Roller; 16. Joint support; 17. Anti-rocker arm; 18. Shaft seat; 19. Horizontal shaft; 20. Spring hook; 21. Handle; 22. Handle shaft; 23. Lug; 24. Guide component; 25. Pull rod; 26. Main rocker arm; 27. Support; 28. Handle shaft support. Detailed Implementation

[0034] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] This utility model embodiment provides a quick-release suspension joint structure for aircraft cabin doors, such as... Figure 1 As shown, the quick-release suspension structure includes: a door frame support 1, two sets of suspension joint assemblies 2, a locking rocker arm 3, a handle transmission mechanism 4, a crossbeam 5, a locking spring 6, a hatch structure 7, and a hatch frame 8.

[0036] like Figure 2 , Figure 3 and Figure 5 As shown, the suspension joint assembly 2 consists of a rotating shaft 11, a rotary joint 12, a fixed joint 13, a rotational spring 14, a roller 15, a joint support 16, a stop rocker arm 17, a shaft seat 18, a horizontal shaft 19, and a spring hook 20. The rotating shaft 11 is the axis of rotation of the hatch; the rotary joint 12 is the movable part of the suspension joint, and the fixed joint 13 is the fixed part of the suspension joint. The semi-circular grooves on the end faces of the two parts combine to form a rotating hole, which cooperates with the rotating shaft to realize the rotation of the hatch around the axis; the stop rocker arm 17... The rotary joint 12 is bolted to the horizontal shaft 19, and the semi-circular notch at the end contacts the roller 15 connected to the rotary joint 12, restricting the rotation of the rotary joint 12. The rotary spring 14 connects the rotary joint 12 and the spring hook 20 fixed on the hatch structure, ensuring that the rotary joint 12 can rotate after the rocker arm 17 is unlocked, so that the hatch can be disengaged from the pivot 11 and the hatch can be quickly disassembled. The joint support 16 and the shaft seat 18 are both fixed to the hatch structure by bolts to support the suspension joint assembly 2.

[0037] like Figure 4As shown, the handle transmission mechanism 4 consists of a handle 21, a handle shaft 22, a lug 23, a guide 24, a pull rod 25, a main rocker arm 26, a support 27, and a handle shaft support 28. The handle 21 is used to drive the lug 23 on the handle shaft 22 to rotate, thereby driving the pull rod 25 to drive the main rocker arm 26 to rotate, which can control the locking and unlocking states of the stop rocker arm 17. The handle shaft support 28 is fixed to the hatch frame structure to support the handle shaft 22. The guide 24 and the support 27 are fixed to the hatch structure to support the pull rod 25 and the rotating shaft 11.

[0038] This utility model consists of two sets of suspension joint assemblies connected together by a crossbeam. A locking rocker arm is connected in the middle of the rotating shaft. The locking rocker arm is connected to a hook fixed to the hatch structure by a locking spring, ensuring that the rocker arm is locked in the locking state when the hatch rotates and opens normally.

[0039] Referring to the attached drawings, a quick-release suspension joint structure for an aircraft cabin door includes a door frame support 1, two sets of suspension joint assemblies 2, a locking rocker arm 3, a handle transmission mechanism 4, a crossbeam 5, a locking spring 6, a cabin door structure 7, and a cabin door frame 8. The suspension joint assembly 2 consists of a rotating shaft 11, a rotary joint 12, a fixed joint 13, a rotary spring 14, a roller 15, a joint support 16, a stop rocker arm 17, a bearing seat 18, a horizontal shaft 19, and a spring hook 20. The handle transmission mechanism 4 consists of a handle 21, a handle shaft 22, a lug 23, a guide 24, a pull rod 25, a main rocker arm 26, a support 27, and a handle shaft support 28.

[0040] The door frame support 1 is connected to the hatch door frame 8 and is used to support the rotating shaft 11 of the suspension joint assembly 2. The rotating shaft 11 has a triangular flat plate with a cylinder sandwiched in the middle. The triangular flat plate is connected to the door frame support 1 by bolts, and the cylinder is the rotation axis of the suspension joint assembly 2. The rotating joint 12 is the movable part of the suspension joint and is connected to the joint support 16 by a pin. It can rotate around the pin. The pointed end of the rotating joint 12 has a semi-circular groove, and the other end has two ears for connecting the roller 15. Near the upper part of the pointed end, there is a single ear for connecting the rotary spring 14. The fixed joint 13 is the fixed part of the suspension joint and is connected to the joint support 16 by bolts. The upper surface of the fixed joint 13 has a semi-circular groove, which, together with the semi-circular groove of the rotating joint 12, forms a rotating hole. It cooperates with the rotating shaft 11 to realize the rotation of the hatch around the axis. The roller 15 is a cylindrical steel part and is connected to the rotating joint 12 by bolts. The connector 12 has a double-ear connection at its end; the upper end of the anti-rocker arm 17 has a semi-circular notch that contacts the roller 15 connected to the rotary connector 12, restricting the rotation of the rotary connector 12, and the lower end is connected to the horizontal shaft 19 by a tapered bolt; the rotary spring 14 is a tension spring that connects the rotary connector 12 and the spring hook 20 fixed on the hatch structure 7, ensuring that the rotary connector 12 can rotate after the anti-rocker arm 17 is unlocked, so that the hatch can be freed from the constraint of the rotating shaft 11 and the hatch can be quickly disassembled; the horizontal shaft 19 is a hollow cylindrical part that is installed on the shaft seat 18 connected to the hatch structure 7, connecting the two sets of suspension connector assemblies 2, and also connecting the handle transmission mechanism 4; the connector support 16 and the shaft seat 18 are both fixed to the hatch structure 7 by bolts to support the suspension connector assembly 2.

[0041] The handle 21 controls the movement of the suspension joint assembly 2. It is a rod with a transverse circular hole at its large end, which is bolted to the handle shaft 22. The handle shaft 22 is a hollow cylindrical part, mounted on the handle shaft support 28 connected to the hatch frame 8. The large end of the lug 23 has a circular hole that connects to the handle shaft 22, and the other end is a single lug with a U-shaped notch, which connects to the double-lug connector on the pull rod 25. The pull rod 25 is a composite rod with double-lug connectors at both ends and a hollow cylinder in the middle, which allows for... The main rocker arm 26 is bolted together; the large end of the main rocker arm 26 has a round hole that connects to the horizontal shaft 19, and the other end has a single ear with a small hole that connects to the double-ear connector on the pull rod 25; the guide 24 is fixed to the hatch structure 7, is a fan-shaped connector with a round hole in the middle that passes through the pull rod 25, and is used to support and guide the pull rod 25; the support 27 is fixed to the hatch structure 7 and is used to support the horizontal shaft 19; the handle shaft support 28 is fixed to the hatch frame 8 structure and is used to support the handle shaft 22.

[0042] The locking rocker arm 3 has a round hole at its large end, which connects to the horizontal shaft 19. The other end has a single ear with a small hole, which connects to the hook of the locking spring 6. The crossbeam 5 is a channel beam, bolted to the rotary joint 12, connecting the two suspension joint assemblies into one unit for synchronous movement. The locking spring 6 is a tension spring, connecting the locking rocker arm 3 and the spring hook 20 fixed to the hatch structure 7, ensuring reliable contact between the stop rocker arm 17 and the roller 15, thus ensuring reliable locking of the stop rocker arm 17. In the event of wear on the rotary joint 12 or the fixed joint 13, the locking spring 6 transmits force to the stop rocker arm 17 through the locking rocker arm 3 and the horizontal shaft 19, applying preload to the rotary joint 12, ensuring that the rotary joint 12 and the rotating shaft 11 remain in contact, guaranteeing reliable opening and closing of the hatch.

[0043] When disassembling the hatch, turn the handle 21 counterclockwise to overcome the tension of the locking spring 6, causing the lug 23 on the handle shaft 22 to rotate. This drives the pull rod 25 to rotate the main rocker arm 26 clockwise, which in turn rotates the horizontal shaft 19 clockwise. The stop rocker arm 17 also rotates clockwise to unlock. The rotary joint 12 rotates clockwise under the action of the return spring 14, disengaging from the fixed joint 13. The hatch then disengages from the constraint of the rotating shaft 11, completing the hatch disassembly. When installing the hatch, pull the crossbeam 5 counterclockwise. After the rotary joint 12 resets, turn the handle 21 clockwise to rotate the stop rocker arm 17 counterclockwise, locking the rotary joint 12.

[0044] In practical implementation, the center of the hole where the lug 23 mates with the double lugs at the end of the lever 25 must be coaxial with the center of the cylinder of the rotating shaft 11 to ensure that the quick-release suspension joint structure does not affect the normal opening and closing of the hatch. Simultaneously, the tension of the locking spring 6 should be greater than the tension of the rotary spring 14 and meet the specified handle force requirements for hatch disassembly. The handle 21 must be equipped with a safety pin or other safety measures to prevent accidental operation. Alternatively, it can be designed as a quick-release handle for use as a ground tool, inserted into the handle shaft 22 during use and stored in a ground toolbox when not in use.

[0045] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made based on the present invention patent, such as the shape and size of the rotary joint and the anti-rocker arm, and the application of this suspension joint to other parts of the aircraft (such as the suspension joint of the emergency jettison door), still fall within the scope of the present invention.

Claims

1. A quick-release suspension structure for aircraft cabin doors, characterized in that, The quick-release suspension structure includes: door frame support (1), two sets of suspension joint assemblies (2), locking rocker arm (3), handle transmission mechanism (4), crossbeam (5), locking spring (6), hatch structure (7), and hatch frame (8). The suspension joint assembly (2) consists of a rotating shaft (11), a rotary joint (12), a fixed joint (13), a rotary spring (14), a roller (15), a joint support (16), a stop rocker arm (17), a shaft seat (18), a horizontal shaft (19), and a spring hook (20). The pivot (11) is the axis of the hatch rotation, the rotary joint (12) is the movable part of the suspension joint, and the fixed joint (13) is the fixed part of the suspension joint. The semi-circular grooves on the end faces of the two parts combine to form a rotating hole, which cooperates with the pivot to realize the rotation of the hatch around the axis. The anti-rocker arm (17) is bolted to the horizontal shaft (19), and the semi-circular notch at the end contacts the roller (15) connected to the rotary joint (12) to restrict the rotation of the rotary joint (12). The rotary spring (14) connects the rotary joint (12) and the spring hook (20) fixed on the hatch structure to ensure that the rotary joint (12) can rotate after the anti-rocker arm (17) is unlocked, so that the hatch can be disengaged from the pivot (11) and the hatch can be quickly disassembled. The joint support (16) and the shaft seat (18) are both bolted to the hatch structure to support the suspension joint assembly (2). The door frame support (1) is connected to the door frame (8) to support the suspension joint assembly (2); the two suspension joint assemblies (2) are connected together by a crossbeam (5), and a locking rocker arm (3) is connected in the middle of the pivot (11). The locking rocker arm (3) is connected together by a locking spring (6) and a spring hook (20) fixed on the door structure (7); The handle transmission mechanism (4) consists of a handle (21), a handle shaft (22), a lug (23), a guide (24), a pull rod (25), a main rocker arm (26), a support (27), and a handle shaft support (28); The handle (21) is used to drive the lug (23) on the handle shaft (22) to rotate, thereby driving the lever (25) to drive the main rocker arm (26) to rotate, which can control the locking and unlocking state of the stop rocker arm (17); the handle shaft support (28) is fixed on the hatch frame structure to support the handle shaft (22); the guide (24) and the support (27) are fixed on the hatch structure to support the lever (25) and the pivot (11).

2. The quick-release suspension structure for aircraft cabin doors according to claim 1, characterized in that, The pivot (11) is a structure with a triangular plate sandwiching a cylinder in the middle. The triangular plate is connected to the door frame support (1) by bolts, and the cylinder is the axis of rotation of the suspension joint assembly (2).

3. The quick-release suspension structure for aircraft cabin doors according to claim 2, characterized in that, The pointed end of the rotary joint (12) has a semi-circular groove, and the other end has two ears for connecting the roller (15). Near the upper part of the pointed end, there is a single ear for connecting the rotary spring (14).

4. The quick-release suspension structure for aircraft cabin doors according to claim 3, characterized in that, The upper surface of the fixed joint (13) is a semi-circular groove, which, together with the semi-circular groove of the rotary joint (12), forms a rotating hole, which, in conjunction with the rotating shaft (11), enables the hatch to rotate around the shaft.

5. The quick-release suspension structure for aircraft cabin doors according to claim 4, characterized in that, The upper end of the stop rocker arm (17) has a semi-circular notch that contacts the roller (15) connected to the rotary joint (12), thus restricting the rotation of the rotary joint (12). The lower end is connected to the horizontal shaft (19) by a tapered bolt.

6. The quick-release suspension structure for aircraft cabin doors according to claim 5, characterized in that, The horizontal shaft (19) is a hollow cylindrical part, which is installed on the bearing (18) connected to the hatch structure (7) to connect the two sets of suspension joint assemblies (2) and the handle transmission mechanism (4); the joint support (16) and the bearing (18) are both fixed to the hatch structure (7) by bolts to support the suspension joint assembly (2).

7. The quick-release suspension structure for aircraft cabin doors according to claim 6, characterized in that, The handle (21) controls the movement of the suspension joint assembly (2). It is a rod with a transverse round hole at the large end, which is bolted to the handle shaft (22). The handle shaft (22) is a hollow cylindrical part, which is installed on the handle shaft support (28) connected to the hatch frame (8). The large end of the lug (23) has a round hole, which is connected to the handle shaft (22). The other end is a single lug with a U-shaped notch, which is connected to the double lug connector on the pull rod (25). The pull rod (25) is a composite rod with double lug connectors at both ends and a hollow cylinder in the middle, which is bolted to the handle shaft (22). The components are assembled into one unit; the large end of the main rocker arm (26) has a round hole that connects to the horizontal shaft (19), and the other end has a single ear with a small hole that connects to the double-ear connector on the pull rod (25); the guide (24) is fixed on the hatch structure (7), and is a fan-shaped connector with a round hole in the middle that passes through the pull rod (25) to support the pull rod (25) and guide it; the support (27) is fixed on the hatch structure (7) to support the horizontal shaft (19); the handle shaft support (28) is fixed on the hatch frame (8) structure to support the handle shaft (22).

8. The quick-release suspension structure for aircraft cabin doors according to claim 7, characterized in that, The large end of the locking rocker arm (3) has a round hole that connects to the horizontal shaft (19), and the other end has a single ear with a small hole that connects to the hook of the locking spring (6). The crossbeam (5) is a channel beam that is bolted to the rotary joint (12) to connect the two sets of suspension joint assemblies into one unit and achieve synchronous movement. The locking spring (6) is a tension spring that connects the locking rocker arm (3) and the spring hook (20) fixed on the hatch structure (7) together to ensure reliable contact between the anti-rocker arm (17) and the roller (15), that is, to ensure reliable locking of the anti-rocker arm (17). In the event of wear of the rotary joint (12) or the fixed joint (13), the locking spring (6) transmits force to the anti-rocker arm (17) through the locking rocker arm (3) and the horizontal shaft (19) to apply preload to the rotary joint (12) so that the rotary joint (12) and the rotating shaft (11) are always in contact, ensuring that the hatch can be reliably opened and closed.

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