Multi-position flexible rapid disassembly and assembly mechanism for cargo hold door

Abstract

The multi-position flexible rapid dismounting and mounting mechanism for the cargo hold door is of a flexible movable and static pulley structure, the actuation stroke is large, the operation load is small, the requirement for man-machine efficacy is better met, and meanwhile the flexible structure can prevent an operation device from colliding with personnel in the dismounting process. And three dismounting and mounting handles are arranged, so that the cargo hold door can be dismounted and mounted after the mounting state of the cargo hold door is observed at different positions. The three handles can independently operate the cargo hold door, and the action of one handle does not cause the position change of other handles. When the limiting device is in a full-limiting position, rotation of the rotating shaft is limited, and reliable connection of the holding-up hammer and the machine body connector is guaranteed. When the limiting device is at the semi-limiting position, the handle is pulled, the limiting boss on the rotating shaft rotates to bypass the limiting point and then stays at the semi-limiting position, and at the moment, the holding-up hammer hemisphere also stays at the semi-mounting position, so that the cargo hold door can be smoothly mounted.

Description

Technical Field

[0001] The present invention belongs to the field of rapid disassembly design of helicopter cargo doors, and particularly relates to a multi-position flexible rapid disassembly and assembly mechanism for cargo doors. Background Art

[0002] As a passage for goods and personnel to enter and exit the helicopter cabin, the cargo door bears a large load, so the cargo door is large in size and heavy in weight.

[0003] The original cargo door used a crank handle, such as Patent CN113928533A. People need to squat inside the fuselage cabin to operate, with poor man-machine efficiency, and an additional maintenance personnel is required for operation. Moreover, the original limiting device has a complex structure, high assembly precision requirements, and it is easy for sundries to enter the interior of the cargo door, resulting in inconvenient use and maintenance. Summary of the Invention

[0004] The present invention provides a multi-position flexible rapid disassembly and assembly mechanism for a cargo door, which can achieve one-key disassembly and rapid installation of the cargo door.

[0005] The present invention provides a multi-position flexible rapid disassembly and assembly mechanism for a cargo door, including: a first rotating shaft system Ⅰ, a second rotating shaft system Ⅱ, a first pulley system Ⅰ, and a second pulley system Ⅱ;

[0006] The cargo door is provided with a first rotating shaft system Ⅰ and a second rotating shaft system Ⅱ. The first rotating shaft system Ⅰ and the second rotating shaft system Ⅱ include a first rotating shaft Ⅰ and a second rotating shaft Ⅱ that are linked and a top hammer;

[0007] The first pulley system Ⅰ includes: a first handle assembly Ⅰ, a second handle assembly Ⅱ, a first movable pulley Ⅰ, and a first rope Ⅰ;

[0008] The first handle assembly Ⅰ and the second handle assembly Ⅱ are respectively connected to both ends of the first rope Ⅰ and are arranged around the first movable pulley Ⅰ. When the first handle assembly Ⅰ or the second handle assembly Ⅱ is pulled, the first movable pulley Ⅰ is driven to move;

[0009] The second pulley system Ⅱ includes: a third handle assembly Ⅲ, a fixed pulley group, a second movable pulley Ⅱ, a third movable pulley Ⅲ, and a second rope Ⅱ;

[0010] The second movable pulley Ⅱ is located between the third movable pulley Ⅲ and the fixed pulley group. The first end of the second rope Ⅱ is connected to the third handle assembly Ⅲ and sequentially bypasses the fixed pulley group, the second movable pulley Ⅱ, the fixed pulley group, and the third movable pulley Ⅲ. The second end is fixedly connected to the cargo door, forming an adjustment margin at the second movable pulley Ⅱ;

[0011] The second movable pulley Ⅱ is hinged to the second rotating shaft Ⅱ, and when the second movable pulley Ⅱ moves, the second rotating shaft Ⅱ is driven to rotate;

[0012] The first movable pulley Ⅰ and the third movable pulley Ⅲ are fixedly connected. When the first movable pulley Ⅰ moves, it drives the third movable pulley Ⅲ to move, and then drives the second movable pulley Ⅱ to move; when the third handle assembly Ⅲ is pulled, it drives the second movable pulley Ⅱ to move.

[0013] Optionally, the first handle assembly Ⅰ and the second handle assembly Ⅱ are respectively arranged on the upper and lower sides of the cargo hold door.

[0014] Optionally, the multi-position flexible quick disassembly and assembly mechanism for the cargo hold door further includes: a limiting component; the limiting component includes: a boss, a limiting shaft, a spring, a support cylinder, and a pin shaft;

[0015] The boss is fixedly arranged on the first rotating shaft Ⅰ and rotates with the first rotating shaft Ⅰ;

[0016] An opening is arranged on the upper surface of the cargo hold door, and a support cylinder is fixedly arranged at the opening. A knob is sleeved outside the support cylinder, and a first limiting groove and a second limiting groove are arranged on the upper end surface of the top of the knob;

[0017] A limiting shaft is arranged inside the support cylinder. The first end of the limiting shaft extends outside the knob, the second end is provided with an annular spring base, and a spring is sleeved on the limiting shaft. One end of the spring contacts the annular spring base, and the other end contacts the inner top of the support cylinder;

[0018] A wedge-shaped area is arranged on the first surface of the second end of the limiting shaft. The second end of the limiting shaft extends into the upper surface of the cargo hold door, and a pin shaft is arranged radially on the first end of the limiting shaft;

[0019] When the boss is on one side of the first surface of the limiting shaft, if the pin shaft is stuck in the first limiting groove, the insertion amount of the second end of the limiting shaft into the upper surface of the cargo hold door is the first insertion amount. At this time, the wedge-shaped area at the second end of the limiting shaft contacts the boss, and there is no restriction on the rotation of the boss. At this time, the cargo hold door can be disassembled; if the pin shaft is stuck in the second limiting groove, the insertion amount of the second end of the limiting shaft into the upper surface of the cargo hold door is the second insertion amount. At this time, the plane at the second end of the limiting shaft contacts the boss, restricting the rotation of the boss. At this time, the cargo hold door is installed in place and locked;

[0020] When the boss is on the opposite side of the first surface of the limiting shaft, the cargo hold door can be disassembled and assembled at a preset angle.

[0021] Optionally, conical contact surfaces are arranged at the ends of the first handle assembly Ⅰ, the second handle assembly Ⅱ, and the second handle assembly Ⅲ and at the positions of the cargo hold door in contact with the handle assembly.

[0022] Optionally, an installation box for the handle is arranged on the cargo hold door, and the contour of the installation box matches the shape of the handle;

[0023] The end of the handle is oval for hand gripping;

[0024] The bottom surface of the installation box is provided with a concave curved surface, which facilitates the fingers to reach in and pull out the handle.

[0025] Optionally, the second end of the second rope Ⅱ is fixedly connected to the cargo compartment door through an adjustment rope assembly.

[0026] Optionally, a support plate is provided on the cargo compartment door;

[0027] A spring is provided between the support plate and the bracket for fixing the second movable pulley Ⅱ;

[0028] The spring provides a tension force to tension the second rope Ⅱ between the handle and the bracket.

[0029] Optionally, a through hole for the first rope Ⅰ to pass through is provided on the support plate.

[0030] The present invention provides a multi-position flexible and rapid disassembly and assembly mechanism for a cargo compartment door. The structure is a flexible static and dynamic pulley structure, which has a large actuation stroke and a small operating load, and better meets the requirements of ergonomics. At the same time, the flexible structure can avoid the collision of the operating device with personnel during the disassembly process. There are three disassembly and installation handles, and after observing the installation state of the cabin door at different positions, the cargo compartment door can be disassembled and installed. The three handles can operate the cargo compartment door independently, and the actuation of one handle will not cause the position change of other handles. When the limiting device is in the full limiting position, it restricts the rotation of the rotating shaft to ensure the reliable connection between the top hammer and the fuselage joint. When the limiting device is in the semi-limiting position, pull the handle, and after the limiting boss on the rotating shaft rotates around the limiting point, it stays in the semi-limiting position. At this time, the top hammer hemisphere will also stay in the semi-installation position, facilitating the smooth installation of the cargo compartment door. The operating handle is provided with a conical sealing surface. After the handle is reset, the inside and outside of the cargo compartment door cannot communicate, avoiding the entry of rainwater and sundries. The operating handle is provided with an installation box, and when there is no operation, the handle can be fixed in the installation box to avoid the shaking of the operating handle. It can realize the rapid disassembly and installation of the cargo compartment door at multiple positions and reduce the number of maintenance support personnel. The device realizes the function of rapid disassembly and installation at three positions; the device has a simple structure and convenient operation, can realize one-key operation, improves the assembly efficiency; the device is a mechanical structure and can be reused, improves the assembly efficiency, thus greatly improving the maintenance efficiency and enhancing the user satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an external schematic diagram of a multi-position flexible and rapid disassembly and assembly mechanism for a cargo compartment door according to the present invention;

[0032] Figure 2 It is an internal schematic diagram of a multi-position flexible and rapid disassembly and assembly mechanism for a cargo compartment door according to the present invention;

[0033] Figure 3Schematic diagram of the first pulley system Ⅰ of a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to the present invention;

[0034] Figure 4 Schematic diagram of the second pulley system Ⅰ of a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to the present invention;

[0035] Figure 5 Cross-sectional view of the limit component of a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to the present invention;

[0036] Figure 6 Schematic diagram of the limit release of the limit component of a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to the present invention;

[0037] Figure 7 Schematic diagram of the to-be-installed state of the limit component of a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to the present invention;

[0038] Figure 8 Schematic diagram of the handle component of a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to the present invention;

[0039] Figure 9 Installation principle diagram of the cargo hold door of a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to the present invention;

[0040] Explanation of reference numerals:

[0041] 1 - Front wall panel

[0042] 2 - Upper surface of the cargo hold door

[0043] 3 - Limit component

[0044] 4 - Side wall panel

[0045] 5 - Frame

[0046] 6 - Top hammer component

[0047] 7 - First handle component Ⅰ

[0048] 8 - Fixed pulley Ⅰ

[0049] 9 - Second handle component Ⅱ

[0050] 10 - First pulley Ⅰ

[0051] 11 - Fixed pulley Ⅱ

[0052] 12 - First rope Ⅰ

[0053] 13 - Pull rod

[0054] 14 - First rotating shaft system Ⅰ

[0055] 15 - Second Rotating Shaft System Ⅱ

[0056] 16 - Fixed Pulley Ⅲ

[0057] 17 - Fixed Pulley Ⅳ

[0058] 18 - Second Rope Ⅱ

[0059] 19 - Third Handle Assembly Ⅲ

[0060] 20 - Support

[0061] 21 - Second Pulley Ⅱ

[0062] 22 - Bracket

[0063] 23 - Adjusting Rope Assembly

[0064] 24 - Spring

[0065] 25 - Third Pulley Ⅲ

[0066] 26 - Limit Boss

[0067] 27 - Support Tube

[0068] 28 - Knob

[0069] 29 - Pin Shaft

[0070] 30 - Limit Shaft

[0071] 31 - Compression Spring

[0072] 32 - Hammer Head

[0073] 33 - Body Joint. Detailed Implementation Manner

[0074] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0075] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely provided to provide a better understanding of the present invention by way of illustrating examples of the present invention. The present invention is in no way limited to any specific arrangements and methods set forth below, but covers any improvements, substitutions, and modifications of structures, methods, and devices without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and technologies are not shown to avoid unnecessarily obscuring the present invention.

[0076] It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other, and the various embodiments may be referred to and cited with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0077] The present invention will be further described in detail below in combination with the embodiments and the drawings, but the embodiments of the present invention are not limited thereto.

[0078] As Figures 1-9 shown, the present invention provides a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door, which can realize one-key disassembly and quick installation of the cargo hold door. Its structure mainly includes a fuselage joint, a hatch joint, a first rotating shaft system I, a second rotating shaft system II, a limiting component, a first pulley system I, a second pulley system II, and a pull rod. The first rotating shaft system I is composed of a top hammer, a hatch joint I, a first rotating shaft I, a limiting boss, and a connecting lug I; the second rotating shaft system II is composed of a top hammer, a hatch joint II, a second rotating shaft II, a connecting lug II, and a connecting lug III; the limiting component is composed of the upper surface of the cargo hold door, a support cylinder, a knob, a pin shaft, a limiting shaft, and a compression spring; the first pulley system I is composed of a first handle assembly I, a fixed pulley I, a second handle assembly II, a first movable pulley I, a fixed pulley II, and a first rope I; the second pulley system II is composed of a third handle assembly III, a fixed pulley III, a fixed pulley IV, a second movable pulley II, a third movable pulley III, a second rope II, an adjustment rope assembly, a spring, a bracket, and a support.

[0079] The present invention provides a multi-position flexible quick disassembly and assembly mechanism for a cargo hold door, including: a first rotating shaft system I, a second rotating shaft system II, a first pulley system I, and a second pulley system II;

[0080] The first rotating shaft system I and the second rotating shaft system II are arranged on the cargo hold door. The first rotating shaft system I and the second rotating shaft system II include a first rotating shaft I and a second rotating shaft II that are linked and a top hammer;

[0081] The first pulley system Ⅰ includes: a first handle assembly Ⅰ, a second handle assembly Ⅱ, a first movable pulley Ⅰ, and a first rope Ⅰ;

[0082] The first handle assembly Ⅰ and the second handle assembly Ⅱ are respectively connected to both ends of the first rope Ⅰ and are arranged around the first movable pulley Ⅰ. When the first handle assembly Ⅰ or the second handle assembly Ⅱ is pulled, the first movable pulley Ⅰ is driven to move;

[0083] The second pulley system Ⅱ includes: a third handle assembly Ⅲ, a fixed pulley set, a second movable pulley Ⅱ, a third movable pulley Ⅲ, and a second rope Ⅱ;

[0084] The second movable pulley Ⅱ is located between the third movable pulley Ⅲ and the fixed pulley set. The first end of the second rope Ⅱ is connected to the third handle assembly Ⅲ, and successively bypasses the fixed pulley set, the second movable pulley Ⅱ, the fixed pulley set, and the third movable pulley Ⅲ. The second end is fixedly connected to the cargo hold door, forming an adjustment margin at the second movable pulley Ⅱ;

[0085] The second movable pulley Ⅱ is hinged to the second rotating shaft Ⅱ, and when the second movable pulley Ⅱ moves, the second rotating shaft Ⅱ is driven to rotate;

[0086] The first movable pulley Ⅰ and the third movable pulley Ⅲ are fixedly connected. When the first movable pulley Ⅰ moves, the third movable pulley Ⅲ is driven to move, and then the second movable pulley Ⅱ is driven to move; when the third handle assembly Ⅲ is pulled, the second movable pulley Ⅱ is driven to move.

[0087] Optionally, the first handle assembly Ⅰ and the second handle assembly Ⅱ are respectively arranged on the upper and lower sides of the cargo hold door.

[0088] Optionally, the multi-position flexible quick disassembly and assembly mechanism for the cargo hold door further includes: a limit assembly; the limit assembly includes: a boss, a limit shaft, a spring, a support cylinder, and a pin shaft;

[0089] The boss is fixedly arranged on the first rotating shaft Ⅰ and rotates with the first rotating shaft Ⅰ;

[0090] An opening is provided on the upper surface of the cargo hold door, and a support cylinder is fixedly arranged at the opening. A knob is sleeved outside the support cylinder, and a first limit groove and a second limit groove are provided on the upper end surface of the top of the knob;

[0091] A limit shaft is arranged inside the support cylinder. The first end of the limit shaft extends outside the knob, and the second end is provided with an annular spring base. A spring is sleeved on the limit shaft. One end of the spring contacts the annular spring base, and the other end contacts the inner top of the support cylinder;

[0092] A wedge-shaped area is provided on the first surface of the second end of the limit shaft. The second end of the limit shaft extends into the upper surface of the cargo hold door, and a pin shaft is arranged radially on the first end of the limit shaft;

[0093] When the boss is located on one side of the first surface of the limit shaft, if the pin shaft is stuck in the first limit groove, the insertion amount of the second end of the limit shaft into the upper surface of the cargo door is the first insertion amount. At this time, the wedge-shaped area at the second end of the limit shaft contacts the boss, and there is no restriction on the rotation of the boss. At this time, the cargo door can be detached. If the pin shaft is stuck in the second limit groove, the insertion amount of the second end of the limit shaft into the upper surface of the cargo door is the second insertion amount. At this time, the flat surface at the second end of the limit shaft contacts the boss, restricting the rotation of the boss. At this time, the cargo door is installed in place and locked.

[0094] When the boss is located on the opposite side of the first surface of the limit shaft, the cargo door can be disassembled and assembled at a preset angle.

[0095] Optionally, a tapered contact surface is provided at the ends of the first handle assembly Ⅰ, the second handle assembly Ⅱ, and the third handle assembly Ⅱ, as well as at the positions on the cargo door that come into contact with the handle assembly.

[0096] Optionally, an installation box for the handle is provided on the cargo door, and the contour of the installation box matches the shape of the handle.

[0097] The end of the handle is oval for easy grasping by the hand.

[0098] The bottom surface of the installation box is provided with a concave curved surface to facilitate the finger to reach in and pull out the handle.

[0099] Optionally, the second end of the second rope Ⅱ is fixedly connected to the cargo door through an adjustment rope assembly.

[0100] Optionally, a support plate is provided on the cargo door.

[0101] A spring is provided between the support plate and the bracket for fixing the second movable pulley Ⅱ.

[0102] The spring provides a tensioning force to tension the second rope Ⅱ between the handle and the bracket.

[0103] Optionally, a through hole for the first rope Ⅰ to pass through is provided on the support plate.

[0104] Exemplarily, the fuselage joint 33 is fixed to the fuselage by bolts, and the fuselage joint 33 is designed with a joint ball socket.

[0105] The hatch joints Ⅰ and Ⅱ are riveted to the front wall panel 1 of the cargo hold by rivets.

[0106] The middle part of the anvil 32 is hinged to the hatch joints I and II through a rotating bolt; the upper spherical head of the anvil 32 is inserted into the spherical socket of the fuselage joint, and the opposite sides of the upper spherical head of the anvil 32 are respectively in contact with the first rotating shaft I 14 and the second rotating shaft II 15; a return spring is designed at the lower end of the anvil 32, and the return spring is located between the anvil 32 and the hatch joint. The function of the return spring is to provide a pre-tightening force for the anvil 32, so that the anvil 32 is always in contact with the first rotating shaft I 14 and the second rotating shaft II 15.

[0107] For the first rotating shaft I 14 and the second rotating shaft II 15, the parts in contact with the anvil 32 are provided with contact surfaces, and the contact surfaces rotate with the rotating shafts, so that the distances from the contact points of the anvil to the rotation axes of the first rotating shaft I 14 and the second rotating shaft II 15 are different.

[0108] A bulkhead 5 is arranged inside the cargo hatch. The first rotating shaft I 14 and the second rotating shaft II 15 pass through the bulkhead 5 and the hatch joint holes on the front wall panel 1, and are thus arranged between the front wall panel 1 of the hatch and the bulkhead 5.

[0109] The first rotating shaft I 14 and the second rotating shaft II 15 can rotate in the holes of the hatch joint and are connected by a pull rod 13 to achieve synchronous rotation.

[0110] The first handle assembly I 7 is arranged on the bottom surface of the cargo hatch, and the second handle assembly II 9 is arranged on the upper surface 2 of the cargo hatch.

[0111] The fixed pulley I 8 and the fixed pulley II 11 are fixed between the front wall panel 1 and the bulkhead 5 through a support plate.

[0112] The first handle assembly I 7 is connected to the second handle assembly II 9 through the first rope I 12, which bypasses the fixed pulley I 8, the first movable pulley I 10, and the fixed pulley II 11.

[0113] The third handle assembly III 19 is arranged on the bottom surface of the cargo hatch.

[0114] The fixed pulley III 16 and the fixed pulley IV 17 are fixed between the front wall panel 1 and the bulkhead 5 through a bracket.

[0115] The bracket 22 is hinged to the connecting lug II of the second rotating shaft II 15; one end of the bracket 22 is connected to the second movable pulley II 21, and the other end is connected to the spring 24.

[0116] One end of the spring 24 is fixed to the support plate between the front wall panel 1 and the bulkhead 5, and the other end is connected to the bracket 22.

[0117] The support 20 is fixed between the front wall panel 1 and the bulkhead 5.

[0118] One end of the adjustment rope assembly 23 is fixed to the support 20, and the other end is connected to the second rope II 18.

[0119] The third handle assembly Ⅲ19 is connected to the adjustment rope assembly 23 through the second rope Ⅱ18, passing around the fixed pulley Ⅲ16, the second movable pulley Ⅱ21, the fixed pulley Ⅳ17, and the third movable pulley Ⅲ25;

[0120] The first pulley system Ⅰ and the second pulley system Ⅱ are connected together through the lugs on the first movable pulley Ⅰ10 and the third movable pulley Ⅲ25;

[0121] The upper surface 2 of the cargo compartment door is fixed between the front wall panel 1 and the bulkhead 5. A limiting boss is provided on the upper surface 2. By restricting the movement of the limiting boss 26 on the first rotating shaft Ⅰ, the rotation of the first rotating shaft Ⅰ is restricted;

[0122] The support cylinder 27 is formed by splicing two support members and is installed on the upper surface 2 of the cargo compartment door through bolts;

[0123] The knob 28 is installed on the outside of the support cylinder 27. Two limiting positions, namely the full limiting position and the half-limiting position, are provided on the upper end surface of the knob 28. They cooperate with the limiting boss 26 on the first rotating shaft Ⅰ14 to restrict the rotation of the rotating shaft when the cargo compartment door is installed and after installation;

[0124] The limiting shaft 30 is installed inside the support cylinder 27. A pin shaft 29 is provided at the upper end of the limiting shaft 30, a boss for installing the spring 31 is provided in the middle, and a limiting tongue for restricting the rotation of the first rotating shaft Ⅰ14 is provided at the lower end;

[0125] When removing the cabin door using the first handle assembly Ⅰ7 or the second handle assembly Ⅱ9:

[0126] S1. Rotate the knob 28 to drive the pin shaft 29 and the limiting shaft 30 to move upward, and fix the limiting shaft 30 at the half-limiting position;

[0127] S2. Pull the first handle assembly Ⅰ7 or the second handle assembly Ⅱ9, so that the length of the first rope Ⅰ12 inside the cargo compartment door becomes shorter, thereby driving the first movable pulley Ⅰ10 and the third movable pulley Ⅲ25 to move to the left;

[0128] S3. When the third movable pulley Ⅲ25 moves to the left, the second rope Ⅱ18 moves to the left, but the length of the second rope Ⅱ18 inside the cargo compartment door remains unchanged;

[0129] S4. To satisfy the rightward movement of the second rope Ⅱ18, the spring 24 must elongate;

[0130] S5. As the spring 24 elongates, the second rotating shaft Ⅱ15 rotates counterclockwise, causing the distance between the top hammer 32 and the axis of the second rotating shaft Ⅱ15 to become smaller;

[0131] S6. Under the action of the return spring, the top hammer 32 rotates counterclockwise. At this time, the ball head of the top hammer 32 partially disengages from the middle of the fuselage joint 33;

[0132] S7. Meanwhile, under the action of the pull rod 13, the first rotating shaft Ⅰ14 rotates synchronously, causing the ball head of the top hammer 32 at the moving shaft Ⅰ14 to partially disengage from the fuselage joint 33;

[0133] S8. Four maintenance personnel stand at the four corner points of the cargo compartment door respectively, lift the cargo compartment door to the disassembly angle, and lift the cargo compartment door away from the fuselage nose 33 along the guide groove on the fuselage joint 33;

[0134] S9. The disassembly of the cargo compartment door is completed.

[0135] When using the third handle assembly Ⅲ19 to disassemble the door:

[0136] S1. Rotate the knob 28 to drive the pin shaft 29 and the limit shaft 30 to move upward, and fix the limit shaft 30 at the semi-limited position;

[0137] S2. Pull the third handle assembly Ⅲ19, making the length of the second rope Ⅱ18 inside the cargo compartment door shorter, and the spring 24 elongates accordingly;

[0138] S3. The spring 24 elongates, causing the second rotating shaft Ⅱ15 to rotate counterclockwise, making the distance between the top hammer 32 and the axis of the second rotating shaft Ⅱ15 smaller;

[0139] S4. Under the action of the return spring, the top hammer 32 rotates counterclockwise. At this time, the ball head of the top hammer 32 partially disengages from the fuselage joint 33;

[0140] S5. Meanwhile, under the action of the pull rod 13, the first rotating shaft Ⅰ14 rotates synchronously, causing the ball head of the top hammer 32 at the moving shaft Ⅰ14 to partially disengage from the fuselage joint 33;

[0141] S6. Four maintenance personnel stand at the four corner points of the cargo compartment door respectively, lift the cargo compartment door to the disassembly angle, and lift the cargo compartment door away from the fuselage nose 33 along the guide groove on the fuselage joint 33;

[0142] S7. The disassembly of the cargo compartment door is completed.

[0143] When installing the door:

[0144] S1. Keep the door at a specific installation angle, and the hemispherical part on the top hammer 3 moves along the guide groove of the fuselage joint 33 until the hemispherical part moves into the joint socket;

[0145] S2. Rotate the door by a certain angle. At this time, the door is in a semi-installed state;

[0146] S3. Pull up the limit shaft 30 to release the limit of the rotating shaft;

[0147] S4. Under the tension of the spring 24, the rotating shaft rotates to the installation position;

[0148] S5. Loosen the limit shaft 30, rotate the knob 28, and place the pin shaft 29 in the full limit position;

[0149] S6. The installation of the hatch door is completed.

[0150] As mentioned above, it is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention, according to the technical solution and concept of the present invention, makes equivalent substitutions or changes, all belong to the protection scope of the present invention.

Claims

1. A multi-position flexible quick disassembly and assembly mechanism for a cargo hold door, characterized in that Including: The first rotating shaft system Ⅰ, the second rotating shaft system Ⅱ, the first pulley system Ⅰ and the second pulley system Ⅱ; The first rotating shaft system Ⅰ and the second rotating shaft system Ⅱ are arranged on the cargo hatch door. The first rotating shaft system Ⅰ and the second rotating shaft system Ⅱ include the linked first rotating shaft Ⅰ and second rotating shaft Ⅱ and the top hammer; The first pulley system Ⅰ includes: the first handle assembly Ⅰ, the second handle assembly Ⅱ, the first movable pulley Ⅰ, and the first rope Ⅰ; The first handle assembly Ⅰ and the second handle assembly Ⅱ are respectively connected to both ends of the first rope Ⅰ and are arranged around the first movable pulley Ⅰ. When the first handle assembly Ⅰ or the second handle assembly Ⅱ is pulled, the first movable pulley Ⅰ is driven to move; The second pulley system Ⅱ includes: the third handle assembly Ⅲ, the fixed pulley group, the second movable pulley Ⅱ, the third movable pulley Ⅲ, the second rope Ⅱ; The second movable pulley Ⅱ is located between the third movable pulley Ⅲ and the fixed pulley group. The first end of the second rope Ⅱ is connected to the third handle assembly Ⅲ, and successively bypasses the fixed pulley group, the second movable pulley Ⅱ, the fixed pulley group and the third movable pulley Ⅲ. The second end is fixedly connected to the cargo hatch door, and an adjustment margin is formed at the second movable pulley Ⅱ; The second movable pulley Ⅱ is hinged to the second rotating shaft Ⅱ, and when the second movable pulley Ⅱ moves, the second rotating shaft Ⅱ is driven to rotate; The first movable pulley Ⅰ and the third movable pulley Ⅲ are fixedly connected. When the first movable pulley Ⅰ moves, the third movable pulley Ⅲ is driven to move, and then the second movable pulley Ⅱ is driven to move; when the third handle assembly Ⅲ is pulled, the second movable pulley Ⅱ is driven to move.

2. The multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to claim 1, characterized in that, The first handle assembly Ⅰ and the second handle assembly Ⅱ are respectively arranged on the upper and lower sides of the cargo hatch door.

3. The multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to claim 1, characterized in that, It also includes: The limit component; the limit component includes: the convex platform, the limit shaft, the spring, the support cylinder, the pin shaft; The convex platform is fixedly arranged on the first rotating shaft Ⅰ and rotates with the first rotating shaft Ⅰ; An opening is arranged on the upper surface of the cargo hatch door. A support cylinder is fixedly arranged at the opening. A knob is sleeved outside the support cylinder. The first limit groove and the second limit groove are arranged on the upper end surface of the top of the knob; A limit shaft is arranged in the support cylinder. The first end of the limit shaft extends outside the knob. The second end is provided with an annular spring base. A spring is sleeved on the limit shaft. One end of the spring contacts the annular spring base, and the other end contacts the inner top of the support cylinder; A wedge-shaped area is arranged on the first surface of the second end of the limit shaft. The second end of the limit shaft extends into the upper surface of the cargo hatch door. The pin shaft is arranged radially on the first end of the limit shaft; When the convex platform is on one side of the first surface of the limit shaft, if the pin shaft is stuck in the first limit groove, the insertion amount of the second end of the limit shaft extending into the upper surface of the cargo hatch door is the first insertion amount. At this time, the wedge-shaped area of the second end of the limit shaft contacts the convex platform, and there is no restriction on the rotation of the convex platform. At this time, the cargo hatch door is detachable; if the pin shaft is stuck in the second limit groove, the insertion amount of the second end of the limit shaft extending into the upper surface of the cargo hatch door is the second insertion amount. At this time, the plane of the second end of the limit shaft contacts the convex platform, restricting the rotation of the convex platform. At this time, the cargo hatch door is installed in place and locked; When the convex platform is on the opposite side of the first surface of the limit shaft, the cargo hatch door can be disassembled and assembled at a preset angle.

4. The multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to claim 1, characterized in that, Conical contact surfaces are arranged at the ends of the first handle assembly Ⅰ, the second handle assembly Ⅱ and the second handle assembly Ⅲ and at the positions on the cargo hatch door where the handle assemblies contact.

5. The multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to claim 4, wherein, A mounting box with a handle is provided on the cargo door, and the contour of the mounting box matches the shape of the handle. The end of the handle is oval for hand gripping. A concave curved surface is provided on the bottom surface of the mounting box to facilitate the finger to reach in and pull out the handle.

6. The multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to claim 1, characterized in that, The second end of the second rope II is fixedly connected to the cargo door through an adjusting rope assembly.

7. The multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to claim 1, characterized in that, A support plate is provided on the cargo door. A spring is provided between the support plate and the bracket for fixing the second movable pulley II. The spring provides a tensioning force to tension the second rope II between the handle and the bracket.

8. The multi-position flexible quick disassembly and assembly mechanism for a cargo hold door according to claim 7, characterized in that, A through hole for the first rope I to pass through is provided on the support plate.

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