A double-opening cabin door mechanism of a UAV

Abstract

The application relates to a double-opening cabin door mechanism of a UAV, belonging to the UAV body structure field. The mechanism is provided with two groups, which are symmetrically installed on the inner sides of left and right double-opening cabin doors and control the opening and closing of the cabin doors installed on the respective sides. In the mechanism, a rotating shaft assembly is fixed on the framework in the cabin door, the control part of the rotating shaft assembly is located outside the cabin door, and the rotating shaft assembly is controlled to rotate through the control part; the bolt assembly is provided with two groups, which are fixed on the upper and lower ends of the inner side of the cabin door in a facing and coaxial mode and are used for locking or unlocking the cabin door; the pull rod assembly comprises an upper pull rod assembly and a lower pull rod assembly, which are respectively connected with the bolts of the upper and lower bolt assemblies and are used for transmitting the rotation of the rotating bolt to the axial up-down movement of the bolts in the bolt assembly. The inclined pull rod assembly is an elastic member and is used for preventing the rotating bolt from freely rotating under non-operation. The application solves the problems that the service life of the existing double-opening cabin door adopting a flap lock structure is limited and the double-opening cabin door is prone to damage, the cost of the linear servo motor electric control structure is high, and the power of the UAV is consumed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of unmanned aerial vehicle body structure, and particularly relates to a double-opening cabin door mechanism of unmanned aerial vehicle, which is a cargo unmanned aerial vehicle cabin door locking mechanism. BACKGROUND

[0002] At present, small and medium-sized cargo unmanned aerial vehicles mostly adopt the form of arranging cabin doors at the tail of the fuselage. In order to ensure a large loading channel, the effective opening of the cabin door needs to be as large as possible. Due to aerodynamic considerations, the tail is generally a semi-closed structure with a rear and upward contraction shape, therefore, the tail cabin door generally has a large curvature change and occupies a large opening space. In order to ensure the rotation space of the cabin door, the manufacturing process, and the better guarantee of the aerodynamic outer edge tolerance after installation, the cabin door is generally designed to be symmetrical along the center of the tail of the aircraft. The two doors are symmetrical, the rotation shafts are located on the left and right sides, and the two doors are opened to the left and right sides, respectively. Sealing elements are arranged between the two cabin doors for sealing.

[0003] In the left and right double-opening cabin door structure, a hatch type cabin door connected by quick-release locks is mostly used. Several trigger type hatch locks are arranged on the upper and lower edges of the hatch. In this form, the cabin door can be quickly opened by pressing each hatch lock to open it. However, according to engineering experience, the service life of each lock is about 50 times of opening and closing. For cargo unmanned aerial vehicles with higher and higher service life requirements, the use cost and maintenance time will be increased. In addition, there are gaps in the connection of the quick-release locks, which have poor rainproof performance. When flying in the air, the area where the two cabin doors are connected has no supporting structure, and the deformation under the action of aerodynamic load will be large, which will increase the aerodynamic resistance.

[0004] Some cargo cabin doors also use linear actuators to control electrically controlled cabin doors. The extension and shortening of the linear actuator are used to control the opening and closing movement of the cabin door. This structure arranges small electrically controlled position locks at the upper and lower door frame positions of the two cabin doors close to the symmetry plane of the aircraft. This form needs to use two linear actuators and two electrically controlled position locks. Mature finished products are generally used, but the overall application cost is high. Controlling the electrically controlled equipment each time the cabin door is closed and opened consumes a certain amount of power. SUMMARY

[0005] Technical problems to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present application provides a mechanical control double-opening cabin door mechanism of unmanned aerial vehicle for the configuration of arranging two cabin doors symmetrically at the tail of the fuselage of a small and medium-sized cargo unmanned aerial vehicle, which solves the problems of limited service life and easy damage of the existing double-opening cabin door using a hatch lock structure, and the high cost and consumption of power of the unmanned aerial vehicle using a linear actuator electrically controlled structure.

[0007] The technical scheme of the present application is: a double-opening hatch mechanism of unmanned aerial vehicle, which is provided with two groups, symmetrically installed on the inner sides of left and right double-opening hatches, respectively used for controlling the opening and closing of the hatch on the side where each group is installed; comprising:

[0008] A rotating shaft assembly, the main part of which is fixed on the frame inside the hatch, close to the abutting surface of the left and right hatches; the control part of which is located outside the hatch and is connected with the rotating pin in the main part through the hatch, used for controlling the rotation of the rotating pin in the main part;

[0009] A latch assembly, which is a latch lock structure, provided with two groups, fixed on the upper and lower ends of the inner side of the hatch in opposite directions and coaxially, located on the same vertical installation line with the main part of the rotating shaft assembly; the one located on the upper end of the hatch is an upper latch assembly, and the one located on the lower end of the hatch is a lower latch assembly; the latch assembly is used for locking or unlocking the hatch;

[0010] A pull rod assembly, including an upper pull rod assembly and a lower pull rod assembly, the upper pull rod assembly is connected with the latch of the upper latch assembly and the upper end of the rotating pin of the rotating shaft assembly; the lower pull rod assembly is connected with the latch of the lower latch assembly and the lower end of the rotating pin of the rotating shaft assembly; the pull rod assembly is used for transmitting the rotation of the rotating shaft assembly to the axial up-down movement of the latch in the latch assembly;

[0011] An inclined pull rod assembly, which is an elastic member, installed in the hatch, one end of which is connected with the frame inside the hatch, and the other end is connected with the rotating pin of the rotating shaft assembly, used for preventing the free rotation of the rotating pin under non-operation.

[0012] Further technical scheme of the present application is: the control part of the rotating shaft assembly is a handle, the handle includes a pull ring, a mounting plate and a pin shaft; one side of the mounting plate is fixed with the pull ring, used for hand operation; the other side of the mounting plate is vertically provided with a pin shaft, the pin shaft is a stepped shaft, the end close to the mounting plate is a thick pin shaft, and the other end is a thin pin shaft; the pin shaft penetrates the hatch and is inserted into the main part of the latch assembly, the thick pin shaft is provided with a strip-shaped through hole along the axial direction, used for anti-rotation connection with the rotating pin.

[0013] Further technical scheme of the present application is: the main part of the rotating shaft assembly includes a base and a rotating pin; the base is fixed on the frame inside the hatch, close to the abutting surface of the left and right hatches, and is provided with a through shaft hole perpendicular to the hatch; the pin shaft of the handle penetrates the hatch and is inserted into the shaft hole;

[0014] The rotating pin is installed on the end of the base away from the hatch, including a sleeve and a bottom plate perpendicular to each other, the sleeve is inserted into the shaft hole and is sleeved on the pin shaft of the handle; the end of the sleeve is provided with a mounting hole matched with the strip-shaped through hole and radially penetrating the sleeve, used for anti-rotation fixed connection with the pin shaft of the handle through the bolt; the end of the bottom plate close to the upper latch assembly is connected with the upper pull rod assembly, and the end of the bottom plate close to the lower latch assembly is connected with the lower pull rod assembly.

[0015] The further technical scheme of the present application is that the main body part of the rotating shaft assembly further comprises a gasket ring, the gasket ring is coaxially sleeved on the outer diameter of the sleeve of the rotating pin, is located at the end of the sleeve, and the end face of the gasket ring facing the bottom plate of the rotating pin abuts against the end face of the rotating shaft hole of the base close to the hatch; the gasket ring is provided with a through hole matching the mounting hole of the sleeve and penetrating through the radial direction, and is used for penetrating through the bolt connecting the sleeve and the pin shaft.

[0016] The further technical scheme of the present application is that the main body part of the rotating shaft assembly further comprises a spring assembly, the spring assembly is used for elastically moving the pin shaft of the handle in the axial direction in the sleeve of the rotating pin; the spring assembly comprises a first spring and a first nut, the first spring is sleeved on the outer diameter of the thin pin shaft, the first nut is threadedly connected with the end of the thin pin shaft, one end of the first spring abuts against the nut, and the other end abuts against a second limiting table arranged in the middle of the inner diameter of the sleeve.

[0017] The further technical scheme of the present application is that the main body part of the rotating shaft assembly further comprises a flange bushing, which is provided with two and is symmetrically mounted at the two ends of the rotating shaft hole of the base, and is used for preventing the rotating pin from wearing the rotating shaft hole.

[0018] The further technical scheme of the present application is that the end face of the bottom plate of the rotating pin facing the base is provided with a stop pin close to the mounting end of the upper pull rod assembly, and correspondingly, a first limiting table corresponding to the stop pin is arranged on the base, and is used for limiting the limit position of the deflection of the upper pull rod assembly connecting end of the bottom plate to the hinged part of the hatch.

[0019] The further technical scheme of the present application is that the upper bolt assembly comprises an upper bolt support, an upper fixed sleeve and an upper bolt, the upper bolt support is fixedly installed on the upper door frame, the upper bolt support is provided with a lock hole, and the lock hole opens downward; the upper fixed sleeve is fixed on the inner framework of the hatch and is located directly below the upper bolt support, the upper fixed sleeve is used for penetrating through the upper bolt and plays a guiding role on the upper bolt; one end of the upper bolt is provided with a connector, the connector is connected with the upper pull rod assembly through a single ear connector; the other end of the upper bolt is sleeved in the upper fixed sleeve, in the locked state, the end of the other end is inserted into the lock hole of the upper bolt support, and in the unlocked state, the end of the other end is lowered to be separated from the lock hole and is located in the upper fixed sleeve.

[0020] The further technical scheme of the present application is that the upper pull rod assembly and the lower pull rod assembly are the same in structure, and the difference is that the total length of the lower pull rod assembly is greater than that of the upper pull rod assembly; the main body of the upper pull rod assembly is a straight connecting rod, and the fork ear joint is fixed at both ends of the straight connecting rod; the fork ear joint at one end of the upper pull rod assembly is connected with the single ear joint fixed at the end of the upper bolt through a pin shaft, and the fork ear joint at the other end is connected with the single ear joint fixed at the bottom plate of the rotating bolt and close to one end of the upper bolt assembly through a pin shaft; the fork ear joint at one end of the lower pull rod assembly is connected with the single ear joint fixed at the end of the lower bolt through a pin shaft, and the fork ear joint at the other end is connected with the single ear joint fixed at the bottom plate of the rotating bolt and close to one end of the lower bolt assembly through a pin shaft.

[0021] The further technical scheme of the present application is that the oblique pull rod assembly comprises a double-ear telescopic pull rod, a single-ear sleeve and a second spring; the rod part of the double-ear telescopic pull rod is embedded in the single-ear sleeve, and the two are axially telescopic and connected; the second spring is sleeved on the outer diameters of the two, one end of the second spring abuts against the baffle at the double-ear part of the double-ear telescopic pull rod, and the other end abuts against the baffle at the single-ear part of the single-ear sleeve, and the second spring is in a compressed state.

[0022] The double-ear end of the double-ear telescopic pull rod is connected with the bottom plate close to the connection of the lower pull rod assembly through a pin shaft, and the single-ear end of the single-ear sleeve is connected with the fixed support installed on the cabin framework through a pin shaft.

[0023] Beneficial effects

[0024] The beneficial effects of the present application are that the present application provides a mechanical control double-opening cabin door mechanism for the configuration of two pairs of cabin doors arranged symmetrically on the left and right of the tail of a small and medium-sized cargo unmanned aerial vehicle, and the two pairs of cabin doors can be quickly unlocked and opened from the outside through rotating handles, the opening speed is fast, the use of springs greatly reduces the control force, saves manpower, the adopted mechanism design motion principle is clear, the mechanical linkage design has high reliability, there is no obvious gap between the mechanism and the cabin door, the waterproof performance is good, the mechanism is connected with the metal framework of the cabin door at multiple positions, the connection is reliable, the mechanism is arranged on the left and right of the butt joint surface of the two pairs of cabin doors and is connected with the upper and lower door frames, the left and right cabin doors have good rigidity at the joint, the overall deformation of the cabin doors is small in the closed state in the air.

[0025] This invention is a motion linkage mechanism composed of a rotating shaft assembly, a pin assembly, a pull rod assembly, and a diagonal pull rod assembly. It is a purely mechanical mechanism with stable function, low cost, long service life, and good maintainability. The rotating shaft assembly is located at the main rotation axis of the entire linkage mechanism and is also the unlocking part. Turning the handle of the rotating shaft assembly unlocks or locks the hatch, making operation simple. The locking part uses a pin assembly, avoiding the limited number of uses of the hatch cover lock and ensuring a long service life. The pin assembly is installed inside the hatch, occupying no extra space and ensuring the airtightness of the hatch and sill. The rotating shaft assembly and the pin assembly are connected by a pull rod assembly, resulting in a simple structure and light weight. The rotation of the rotating shaft assembly is converted into the up-and-down movement of the pin in the pin assembly, realizing the opening and closing of the lock. The vertically opposite design of the pin assembly and the pull rod assembly simplifies the structure and provides vertical linkage. The diagonal tie rod assembly further stabilizes the rotating shaft assembly. When the hatch is locked, the diagonal tie rod assembly pushes the lower end of the rotating pin base plate in the rotating shaft assembly, which, together with the stop pin at the upper end of the base plate and the first limiting platform, keeps the rotating pin in the rotating shaft assembly stable in a vertical state, preventing the rotating pin from rotating arbitrarily and affecting the locking. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the handle installation position in this invention as seen from outside the hatch;

[0027] Figure 2 This is a schematic diagram of the installation of the double-door mechanism of the UAV of the present invention inside the door;

[0028] Figure 3 This is a schematic diagram of the installation of the double-door mechanism of the UAV of the present invention inside the left-side (left-side facing the heading) door;

[0029] Figure 4 This is a cross-sectional view of the rotating shaft assembly in this invention.

[0030] Figure 5 This is a schematic diagram of the structural composition of the rotating shaft assembly in this invention;

[0031] Figure 6 This is a schematic diagram showing the installation position relationship of the base, flange bushing, and washer ring in this invention;

[0032] Figure 7 These are three structural views of the rotating pin in this invention;

[0033] Figure 8 for Figure 7 AA section view in the middle;

[0034] Figure 9 These are three structural views of the handle in this invention;

[0035] Figure 10The connecting structure diagram of the inclined pull rod assembly in the application;

[0036] Figure 11 The structure diagram of the inclined pull rod assembly without the second spring in the application;

[0037] Figure 12 The structure diagram of the upper bolt assembly in the application;

[0038] Figure 13 The structure diagram of the upper fixed sleeve in the application;

[0039] Figure 14 The installation diagram of the upper pull rod assembly in the application;

[0040] Figure 15 The movement diagram of the double opening hatch door mechanism of the unmanned aerial vehicle in the application, wherein a is the mechanism locking state, and b is the mechanism unlocking state.

[0041] BRIEF DESCRIPTION OF DRAWINGS: 1. rotating shaft assembly, 11. handle, 111. pull ring, 112. mounting plate, 113. pin shaft, 114. strip-shaped through hole, 115. thick pin shaft, 116. thin pin shaft, 12. base, 121. rotating shaft hole, 122. first limiting table, 123. web, 124. main mounting panel, 13. rotating pin, 131. sleeve, 132. bottom plate, 133. mounting hole, 134. second limiting table, 135. stop pin, 136. upper pull rod butt joint shaft hole, 137. lower pull rod butt joint shaft hole, 138. inclined pull rod butt joint shaft hole, 14. grommet, 15. spring assembly, 151. first spring, 152. first nut, 16. single ear joint assembly, 161. single ear joint, 162. third nut, 17. bolt assembly, 171. bolt, 172. second nut, 173. gasket, 18. flange bushing, 2. upper bolt assembly, 21. upper bolt support, 211. lock hole, 22. upper fixed sleeve, 221. rim of the upper fixed sleeve, 222. shaft hole of the upper fixed sleeve, 23. upper bolt, 3. lower bolt assembly, 4. upper pull rod assembly, 5. lower pull rod assembly, 6. inclined pull rod assembly, 61. double ear telescopic pull rod, 62. single ear sleeve, 63. second spring, 7. hatch door, 71. left and right hatch door butt joint surface, 72. upper door frame, 73. lower door frame, 74. framework, 75. hatch door skin, 8. fixed support, 9. gooseneck hinge, 10. rear fuselage. DETAILED DESCRIPTION

[0042] The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] See Figure 1 , 3 This embodiment provides a mechanically operated double-door mechanism for a configuration with two symmetrically arranged hatches on the tail of a small-to-medium-sized cargo drone (UAV). The hatches 7 consist of a composite skin and an internal crisscrossing metal frame 74. The left and right hatches 7 are hinged to their respective side frames via two sets of gooseneck hinges 9. The hatches 7 open to both sides along the rotation axis of the gooseneck hinges 9. The double-door mechanism of this invention has two sets, symmetrically installed inside the left and right double-doors 7, near the hatch mating surface 71, respectively controlling the opening and closing of the left and right hatches 7. Except for the control handle 11, which protrudes from the hatches 7, all other components are located inside the hatches 7, allowing the left and right hatches 7 to open simultaneously from the outside. This results in a fast opening speed, low operating force, high reliability, good waterproof performance, good rigidity when closed in the air, and provides support for the hatches 7, minimizing overall deformation.

[0045] See Figure 3 This embodiment uses a door mechanism installed on the left cabin door 7 (left side when standing at the tail of the fuselage facing the heading) as an example. The door mechanism includes a rotating shaft assembly 1, a pin assembly, a pull rod assembly, and a diagonal pull rod assembly 6, which together form a motion linkage mechanism. The pin assembly has two sets, including an upper pin assembly 2 and a lower pin assembly 3 installed at the upper and lower ends of the cabin door 7, respectively. The pull rod assembly includes an upper pull rod assembly 4 connecting the upper pin assembly 2 and the rotating shaft assembly 1, and a lower pull rod assembly 5 connecting the rotating shaft assembly 1 and the lower pin assembly 3. The detailed structure of each component is described below:

[0046] See Figures 4-9 The rotating shaft assembly 1, fixed to the metal frame 74 inside the hatch 7, is both the main rotating shaft of the entire linkage mechanism and the unlocking control part. The rotating shaft assembly 1 includes a handle 11, a base 12, a rotating pin 13, a washer 14, a spring assembly 15, a single-ear connector assembly 16, a bolt assembly 17, and a flange bushing 18.

[0047] Specifically, the base 12 is fixed to the framework 74 arranged longitudinally in the cabin door 7 and close to the left and right abutting surfaces 71 of the cabin door 7 as a mounting support. The base 12 is provided with a web plate 123 on one side, and the base 12 is fixedly connected to the framework 74 by a bolt passing through the web plate 123, so that the main mounting panel 124 of the base is substantially parallel to the cabin door 7 at the mounting position of the base 12. The main mounting panel 124 of the base is provided with a boss protruding from the center of the main mounting panel 124 to both sides, and a rotating shaft hole 121 is vertically arranged in the center of the boss and penetrates the boss, and the rotating shaft hole 121 is substantially perpendicular to the cabin door skin 75 at the mounting position.

[0048] The handle 11 is a control component of the rotating shaft assembly 1, which includes a pull ring 111, a mounting plate 112 and a pin shaft 113. The pull ring 111 is fixed to one side of the mounting plate 112 and located outside the cabin door 7 for hand operation. The pin shaft 113 is vertically arranged on the other side of the mounting plate 112 and is a stepped shaft, which includes a thick pin shaft 115 close to the mounting plate 112 and a thin pin shaft 116 at the other end. The pin shaft 113 penetrates the cabin door 7 and is inserted into the rotating shaft hole 121 of the base 12, and is rotationally connected to the rotating pin 13 inserted into the rotating shaft hole 121 from the other end of the rotating shaft hole 121, so that the rotating pin 13 is controlled to rotate by the handle 11. A slot hole is arranged on the cabin door 7, which is consistent with the shape of the mounting plate 112 and accommodates the mounting plate 112. The pin shaft 113 enters the cabin door 7 from the slot hole, and the slot hole blocks the pull ring 111 outside the cabin door 7. In this embodiment, the pin shaft 113 is offset relative to the pull ring 111, i.e. the pin shaft 113 is located at the upper end of the pull ring 111 in the vertical state, which facilitates the rotating operation of the pull ring 111. A strip-shaped through hole 114 is arranged in the thick pin shaft 115 along the axial direction and penetrates the axial diameter of the thick pin shaft 115, which is used for rotationally connecting the rotating pin 13 and also realizes the axial movement of the pin shaft 113.

[0049] The rotating pin 13 is installed at the end of the base 12 away from the cabin door 7. The rotating pin 13 has a T-shaped structure, including a sleeve 131 and a bottom plate 132 perpendicular to each other, and the sleeve 131 is located at the center of the bottom plate 132. The sleeve 131 is a hollow straight cylinder, and the end of the sleeve 131 away from the bottom plate 132 is inserted into the rotating shaft hole 121 and simultaneously sleeved on the outer diameter of the pin shaft 113 of the handle 11 and matched with the gap therebetween; the bottom plate 132 is a plate structure with a rhombus structure and a circular arc transition at the corners, and is located outside the rotating shaft hole 121. The end of the sleeve 131 away from the bottom plate 132 is provided with a mounting hole 133 matched with the strip-shaped hole 114 and radially penetrating the sleeve, which is used to realize the anti-rotation connection of the pin shaft 113 and the sleeve 131 through the bolt assembly 17. The sleeve 131 is matched with the gap between the outer diameter and the inner diameter of the rotating shaft hole 121, and is rotated by the handle 11, so that the sleeve 131 is rotated in the rotating shaft hole 121. In order to reduce the wear of the sleeve 131 to the rotating shaft hole 121, flange bushings 18 are installed at the two end ports of the rotating shaft hole 121, and the two flange bushings 18 are symmetrically installed at the two ends of the rotating shaft hole 121. The flange of the flange bushing 18 is located outside the rotating shaft hole 121 and in contact with the end surface of the bottom plate 132 facing the base 12. The flange bushing 18 plays a role in preventing wear and improving the service life of the rotating shaft assembly 1.

[0050] The grommet 14 is coaxially sleeved on the outer diameter of the sleeve 131 of the rotating pin 13, located at the end of the sleeve 131 away from the bottom plate 132, and the end penetrates out of the rotating shaft hole 121. The end surface of the grommet 14 facing the bottom plate 132 is in contact with the boss end surface of the rotating shaft hole 121 close to the cabin door 7. The grommet 14 is provided with a through hole matched with the mounting hole 133 of the sleeve 131 and penetrating in the radial direction, which is used to cooperate with the bolt assembly 17 for installation. Specifically, the bolt assembly 17 includes a bolt 171, a second nut 172 and a washer 173. The bolt 171 penetrates the through hole of the grommet 14, the mounting hole 133 of the sleeve 131 and the strip-shaped hole 114 of the pin shaft 113, and is locked by cooperating with the washer 173 and the second nut 172. The grommet 14 can increase the reliability of the connection of the bolt assembly 17. After the connection is completed, the axial position of the rotating pin 13 and the grommet 14 is fixed, and due to the structure of the strip-shaped hole 114 of the pin shaft 113, the pin shaft 113 can move axially. The spring assembly 15 installed at the end of the pin shaft 113 elastically moves along the pin shaft 113 in the axial direction, so that the mounting plate 112 of the handle 11 is separated from the slot hole of the cabin door 7, and the handle 11 is convenient to rotate.

[0051] The spring assembly 15, used for the handle pin 113, moves axially elastically within the sleeve 131 of the rotating pin 13, providing an elastic return function. The spring assembly 15 includes a first spring 151 and a first nut 152. The first spring 151 is fitted onto the outer diameter of the thin pin 116. The end of the thin pin 116 away from the thick pin 115 has an external thread. The first nut 152 is a hexagonal head self-locking nut, threadedly connected to the end of the thin pin 116. One end of the first spring 151 abuts against the first nut 152, and the other end abuts against a second limiting step 134 set on the inner diameter of the sleeve 131. When the handle 11 is pulled axially outward along the pin 113 using the pull ring 111, the first spring 151 is compressed, and the strip-shaped through hole 114 of the pin 113 moves axially outward relative to the bolt 171, causing the handle 11 to be pulled out. Figure 4 The diagram shows the internal structure of the rotating shaft assembly 1 in the locked state of the hatch 7. In this state, the first spring 151 is in a free state, and the base plate 132 of the pull ring 111 and the rotating pin 13 is in a vertical and symmetrical state. A set of single-ear connector assemblies 16 are respectively installed at the upper and lower ends of the base plate 132, for connecting to the upper pull rod assembly 4 and the lower pull rod assembly 5, respectively. The single-ear connector assembly 16 includes a single-ear connector 161 and a third nut 162. The rod of the single-ear connector 161 penetrates the base plate 132 and is fixed by the third nut 162, which is a self-locking nut. Specifically, an upper pull rod docking shaft hole 136 is provided at the upper end of the base plate 132, and a lower pull rod docking shaft hole 137 is provided at the lower end of the base plate 132, both for installing the single-ear connector 161.

[0052] See Figure 3 , 12 -14. The latch assembly is a latch lock structure, with two sets, facing each other and coaxially fixed to the upper and lower ends of the inner side of the hatch 7, and located on the same vertical installation line as the rotating shaft assembly 1. The upper latch assembly 2 is located at the upper end of the hatch, and the lower latch assembly 3 is located at the upper end of the hatch. The latch assembly is used to lock or unlock the hatch 7.

[0053] Specifically, the above pin assembly 2 is taken as an example, the upper pin support 21 is fixedly installed on the upper door frame 72 in the cabin door, the upper pin support 21 is provided with a lock hole 211, the lock hole 211 is downwardly open, i.e. towards the rotating shaft assembly 1. The upper fixed sleeve 22 is fixed on the framework 74 in the cabin door, and is located directly below the upper pin support 21. The upper fixed sleeve 22 is provided with two axial flanges 221, which are used to pass through fasteners and the framework 74 to be fixedly connected. The upper fixed sleeve 22 is provided with an axial hole 222, which is used to pass through the upper pin 23. The upper fixed sleeve 22 plays a guiding role on the upper pin 23. One end of the upper pin 23 is a joint structure, the joint is connected with one end of the upper pull rod assembly 4 through the vertical installation of a single ear joint 161, and the other end of the upper pin 23 is a light pole end, which is inserted into the upper fixed sleeve 22. When the upper pin assembly 2 is in the locked state, the light pole end of the upper pin 23 inserted into the lock hole 211 of the upper pin support 21; when the upper pin assembly 2 is in the unlocked state, the light pole end of the upper pin 23 inserted into the lock hole 211 is moved downward to be separated from the lock hole 211, and is moved to the axial hole 222 of the upper fixed sleeve 22.

[0054] The lower pin assembly 3 is the same as the upper pin assembly 2, and only the installation direction is different. The lower pin support of the lower pin assembly 3 is installed on the upper door frame 73, and is opposite to the position of the upper pin support 21; the lower fixed sleeve of the lower pin assembly 3 is fixed on the framework 74 at the lower end of the cabin door, and is located directly above the lower pin support, and the joint end of the lower pin is also connected with the lower pull rod assembly 5 through the installation of a single ear joint 161.

[0055] Referring to Figure 3 , the pull rod assembly includes the upper pull rod assembly 4 and the lower pull rod assembly 5, the upper pull rod assembly 4 is connected with the upper pin of the upper pin assembly 2 and the upper end of the rotating pin 13, the lower pull rod assembly 5 is connected with the lower pin of the lower pin assembly 3 and the lower end of the rotating pin 13, and the pull rod assembly is used to transmit the rotation of the rotating pin 13 to the axial up-down movement of the pin in the pin assembly, so as to realize the linkage of the rotating shaft assembly 1 and the lower pin assembly.

[0056] Specifically, referring to Figure 14 , the upper pull rod assembly 4 and the lower pull rod assembly 5 are the same in structure, and the difference lies in that according to the installation height of the rotating shaft assembly 1 in the cabin door, the different lengths of the upper pull rod assembly 4 and the lower pull rod assembly 5 are determined. In the embodiment, the total length of the lower pull rod assembly 5 is greater than that of the upper pull rod assembly 4. Referring to Figure 14, the above pull rod assembly 4 as an example, the pull rod assembly 4 main body is straight connecting rod, both ends are fixed with yoke joint. The yoke joint of the pull rod assembly 4 one end is connected with the single ear joint 161 fixed in the end of the upper bolt 23 through the pin shaft, and the yoke joint of the other end is connected with the single ear joint 161 fixed on the upper end of the bottom plate 132 through the pin shaft. The yoke joint of the lower pull rod assembly 5 one end is connected with the single ear joint 161 fixed in the end of the lower bolt through the pin shaft, and the yoke joint of the other end is connected with the single ear joint 161 fixed on the lower end of the bottom plate 132 through the pin shaft.

[0057] Referring to Figure 10 , 11 , the inclined pull rod assembly 6 is a elastic member, installed in the hatch door 7, one end of which is connected with the metal framework 74 in the hatch door 7, and the other end is connected with the rotating pin 13 of the rotating shaft assembly 1. The inclined pull rod assembly 6 is used to prevent the rotating pin 13 from rotating freely in the non-operation state, and ensure the stability of the mechanism in the locked state.

[0058] Specifically, the inclined pull rod assembly 6 includes a double ear telescopic pull rod 61, a single ear sleeve 62 and a second spring 63. The rod of the double ear telescopic pull rod 61 is embedded in the single ear sleeve 62, and the two are axially telescopic. The second spring 63 is sleeved on the outer diameter of the two, one end of the second spring 63 abuts against the baffle at the double ear of the double ear telescopic pull rod 61, and the other end abuts against the baffle at the single ear of the single ear sleeve 62. The second spring 63 is in a compressed state. The double ear end of the double ear telescopic pull rod 61 is connected with the lower end of the bottom plate 132 of the rotating pin through the pin shaft, and the single ear end of the single ear sleeve 62 is connected with the fixed support 8 installed on the hatch door framework 74 through the pin shaft.

[0059] In the structure of the present application, when the hatch door is in the locked state, the bottom plate 132 of the rotating pin 13 is basically in a vertical state, and referring to Figure 5 , 7 , the lower end of the bottom plate 132 in this state is provided with an inclined pull rod connecting shaft hole 138, and the double ear end of the inclined pull rod assembly is connected through the pin shaft passing through the inclined pull rod connecting shaft hole 138. Because the second spring 63 is in a compressed state, a pushing force is generated on the bottom plate 132, and the rotating pin 13 will rotate, that is, the upper end of the bottom plate 132 will rotate towards the fixed support 8 (that is, the hinged side of the hatch door 7). In order to limit the excessive deflection of the upper end of the bottom plate 132, a stop pin 135 is arranged on the end surface of the bottom plate 132 facing the bottom plate 132, and a corresponding first limiting table 122 is arranged on the bottom plate 12 to cooperate with the stop pin 135, so as to limit the limit position of the upper end of the bottom plate 132 rotating towards the hinged end of the hatch door 7. The pushing force of the inclined pull rod assembly 6 cooperates with the rotation limiting of the upper end of the bottom plate 132, so that the rotating pin 13 is in a stable state in the locked state of the hatch door, and the free rotation of the rotating pin 13 is avoided.

[0060] Referring to Figure 15When the double opening hatch door mechanism is unlocked, the pull ring 111 of the pull handle 11 is pulled out to the limit state from the outside of the hatch door 7, at this time, the first nut 152 is in contact with the rotating pin 13, the first spring 151 is pressed, and the mounting plate 112 is separated from the slot hole of the hatch door skin 75. The pull ring 111 is rotated by 90° in the direction away from the butt joint surface 71 of the left and right hatch doors, at this time, the rotating pin 13 is rotated, the connecting rod mechanism composed of the upper pull rod assembly 4, the lower pull rod assembly 5 and the inclined pull rod assembly 6 is rotated around the axis of the rotating pin 13, the upper pull rod assembly 4 pulls down the upper bolt 23 in the upper bolt assembly 2, the lower pull rod assembly 5 pulls up the lower bolt in the lower bolt assembly 3, and the inclined pull rod assembly 6 is further compressed, so that the upper and lower bolts move away from the respective bolt supports, the light rod end of the upper and lower bolts is separated from the lock hole of the corresponding bolt support and enters the respective fixed sleeve, the hatch door 7 is unlocked, and then opened, and the left and right hatch doors 7 are opened to the predetermined state.

[0061] When the double opening hatch door mechanism is locked, the left and right hatch doors 7 are closed, the pull ring 111 of the pull handle 11 is rotated by 90° in the direction close to the butt joint surface 71 of the left and right hatch doors from the outside of the hatch door 7, the rotating pin 13 is rotated, the connecting rod mechanism composed of the upper pull rod assembly 4, the lower pull rod assembly 5 and the inclined pull rod assembly 6 is operated: the upper pull rod assembly 4 pushes up the upper bolt 23 in the upper bolt assembly 2, the lower pull rod assembly 5 pushes down the lower bolt in the lower bolt assembly 3, the upper bolt 23 in the upper bolt assembly 2 moves upward along the upper fixed sleeve 22 and enters the lock hole 211 of the upper bolt support 21, and at the same time, the lower bolt also enters the lock hole of the lower bolt support. At this time, the inclined pull rod assembly 6 pushes the bottom plate 132 of the rotating pin 13, so that the stop pin 135 at the upper end of the bottom plate 132 is in abutment with the first limiting table 122 of the bottom plate 12 to limit the rotation of the bottom plate 132, prevent excessive rotation, and realize that the bottom plate 132 is basically in a vertical state, that is, in the length direction, the upper pull rod assembly 4 and the lower pull rod assembly 5 are basically on the same vertical axis, and the stability of the rotating pin 13 is maintained. Then the pull ring 111 is pressed inward to the most extreme state, as shown in FIG. 8, so that the mounting plate 112 is embedded in the slot hole of the hatch door skin 75, the first spring 151 returns to the free state, the outer diameter of the bolt 171 of the bolt assembly 17 is in abutment with the hole wall close to the mounting plate 112 side of the strip-shaped through hole 114, at this time, the pull handle 11 reaches the state closest to the inner side of the hatch door 7, and the hatch door 7 is locked. Figure 4

[0062] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments without departing from the principles and purposes of the present application within the scope of the present application.​

Claims

1. A UAV double opening hatch mechanism, characterized in that, Two sets of mechanisms are symmetrically installed on the inner sides of the left and right double-opening hatches and are used to control the opening and closing of the hatches on the respective sides. The rotating shaft assembly has a main part fixed to the frame inside the hatch near the abutting surface of the left and right hatches and a control part outside the hatch and connected to the rotating pin in the main part through the hatch for controlling the rotation of the rotating pin. The latch assembly is a latch structure and has two sets of latches fixed to the upper and lower ends of the inner side of the hatch coaxially and oppositely and located on the same vertical installation line as the main part of the rotating shaft assembly. The upper latch assembly is located at the upper end of the hatch, and the lower latch assembly is located at the lower end of the hatch. The pull rod assembly includes an upper pull rod assembly connected to the upper end of the rotating pin of the rotating shaft assembly and the latch of the upper latch assembly and a lower pull rod assembly connected to the lower end of the rotating pin of the rotating shaft assembly and the latch of the lower latch assembly. The oblique pull rod assembly is an elastic member installed inside the hatch and connected to the rotating pin of the rotating shaft assembly at one end and to the frame inside the hatch at the other end for preventing the rotating pin from rotating freely under non-operation. The control part of the rotating shaft assembly is a handle including a pull ring, a mounting plate and a pin shaft. The mounting plate is fixed to one side of the pull ring for hand operation. The other side of the mounting plate is vertically provided with a pin shaft which is a stepped shaft with a thick pin shaft near the mounting plate and a thin pin shaft at the other end.

2. The UAV double opening hatch mechanism of claim 1, wherein, The pin shaft penetrates the hatch and is inserted into the main part of the rotating shaft assembly. The main part of the rotating shaft assembly includes a base fixed to the frame inside the hatch near the abutting surface of the left and right hatches and a rotating pin. The base is vertically provided with a rotating shaft hole penetrating the hatch. The rotating pin is installed at the end of the base away from the hatch and includes a sleeve and a bottom plate perpendicular to each other. The sleeve is inserted into the rotating shaft hole and is sleeved on the pin shaft of the handle. The end of the sleeve is provided with a mounting hole matching the strip-shaped hole and penetrating the sleeve radially for preventing rotation and fixed connection with the pin shaft of the handle through a bolt. The bottom plate is connected to the upper pull rod assembly near the upper latch assembly and to the lower pull rod assembly near the lower latch assembly. The end of the bottom plate facing the base is provided with a stop pin near the connection end of the upper pull rod assembly. The main part of the rotating shaft assembly further includes a spacer ring coaxially sleeved on the outer diameter of the sleeve of the rotating pin at the end of the sleeve. The spacer ring is provided with a through hole matching the mounting hole of the sleeve and penetrating radially for passing through the bolt connecting the sleeve and the pin shaft.

3. The UAV double opening hatch mechanism according to claim 1, wherein, The main body part of the rotating shaft assembly further comprises a spring assembly for elastically moving the pin shaft of the pull handle in the sleeve of the rotating pin in the axial direction; the spring assembly comprises a first spring and a first nut, the first spring is sleeved on the outer diameter of the thin pin shaft, the first nut is threadedly connected with the end of the thin pin shaft, one end of the first spring abuts against the first nut, and the other end abuts against a second limiting block arranged in the middle of the inner diameter of the sleeve.

4. The UAV double opening hatch mechanism of claim 1, wherein, The main body part of the rotating shaft assembly further comprises flange bushings arranged at two ends of the rotating shaft hole of the base and symmetrically installed, which are used for preventing the rotating pin from wearing the rotating shaft hole.

5. The UAV double opening hatch door mechanism according to claim 1, wherein, The upper bolt assembly comprises an upper bolt support, an upper fixed sleeve and an upper bolt, the upper bolt support is fixedly installed on the upper door frame, the upper bolt support is provided with a lock hole, and the lock hole is downwardly open; the upper fixed sleeve is fixed to the framework in the hatch door and located directly below the upper bolt support, the upper fixed sleeve is used for penetrating through the upper bolt and guiding the upper bolt; one end of the upper bolt is provided with a joint, the joint is connected with the upper pull rod assembly through a single ear joint; the other end of the upper bolt is arranged in the upper fixed sleeve, in the locked state, the end is inserted into the lock hole of the upper bolt support, and in the unlocked state, the end is lowered to be separated from the lock hole and located in the upper fixed sleeve.

6. The UAV double opening hatch door mechanism according to claim 5, wherein, The upper pull rod assembly and the lower pull rod assembly are the same in structure, and the difference lies in that the total length of the lower pull rod assembly is greater than that of the upper pull rod assembly; the main body of the upper pull rod assembly is a straight connecting rod, and a fork ear joint is fixed to each end of the straight connecting rod; the fork ear joint at one end of the upper pull rod assembly is connected with a single ear joint fixed to the end of the upper bolt through a pin shaft, and the fork ear joint at the other end is connected with a single ear joint fixed to the bottom plate and close to the upper bolt assembly through a pin shaft; the fork ear joint at one end of the lower pull rod assembly is connected with a single ear joint fixed to the end of the lower bolt through a pin shaft, and the fork ear joint at the other end is connected with a single ear joint fixed to the bottom plate and close to the lower bolt assembly through a pin shaft.

7. The UAV double opening hatch door mechanism according to claim 1, wherein, The diagonal pull rod assembly comprises a double-ear telescopic pull rod, a single ear sleeve and a second spring; the rod part of the double-ear telescopic pull rod is embedded in the single ear sleeve, and the double-ear telescopic pull rod and the single ear sleeve are axially telescopic and connected; the second spring is sleeved on the outer diameters of the double-ear telescopic pull rod and the single ear sleeve, one end of the second spring abuts against the baffle at the double-ear end of the double-ear telescopic pull rod, and the other end abuts against the baffle at the single-ear end of the single ear sleeve, and the second spring is in a compressed state. The double-ear end of the double-ear telescopic pull rod is connected with the connection part of the bottom plate close to the lower pull rod assembly through a pin shaft, and the single-ear end of the single ear sleeve is connected with a fixed support installed on the framework of the hatch door through a pin shaft.

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