Double-opening cabin door mechanism of unmanned aerial vehicle

Abstract

The invention discloses an unmanned aerial vehicle double-opening cabin door mechanism and belongs to the field of unmanned aerial vehicle body structures. The two sets of mechanisms are symmetrically installed on the inner sides of the left double-opening cabin door and the right double-opening cabin door and control opening and closing of the installed side cabin doors. In the mechanism, a rotating shaft assembly is fixed on a framework in a cabin door, a control part is located outside the cabin door, and a rotating pin on the inner side of the rotating shaft assembly is controlled to rotate through the control part; the two bolt assemblies are oppositely and coaxially fixed to the upper end and the lower end of the inner side of the cabin door and 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 correspondingly connected with the bolts of the bolt assemblies at the upper end and the lower end respectively and used for transmitting rotation of the rotating pins into axial up-and-down movement of the bolts in the bolt assemblies. The diagonal draw bar assembly is an elastic piece and is used for preventing the rotating pin from freely rotating under non-operation. The double-opening cabin door solves the problems that an existing double-opening cabin door is limited in opening and closing life and prone to damage by adopting an opening cover lock structure, and a linear steering engine electric control structure is high in cost and consumes power of an unmanned aerial vehicle.

Description

Technical Field

[0001] The invention belongs to the field of unmanned aerial vehicle body structures, and in particular relates to a double-opening cabin door mechanism of an unmanned aerial vehicle, which is a cabin door locking mechanism of a cargo unmanned aerial vehicle. Background Art

[0002] At present, most small and medium-sized cargo drones use the form of a door at the tail of the fuselage. In order to ensure a larger loading channel, the effective opening of the door needs to be as large as possible. For aerodynamic considerations, the tail is generally a semi-enclosed structure with a shape that shrinks backward and upward. Therefore, the curvature of the tail door generally changes greatly and the opening space occupies a large amount. In order to ensure the rotation space of the door, the manufacturing processability, and the requirements of the aerodynamic outer edge tolerance after installation, the door is generally designed to be two symmetrical doors along the central symmetry plane of the tail of the aircraft, with the rotating shaft located on the left and right sides, opening to the left and right sides respectively, and a seal is arranged between the two doors for sealing.

[0003] In the left and right double-opening door structure, a hatch-type door connected by a quick-release lock is mostly used, and several trigger-type hatch locks are arranged on the upper and lower edges of the hatch. In this type of door, each hatch lock needs to be pressed to open it, so the door can be opened quickly. However, based on engineering experience, the service life of the hatch lock is about 50 times of opening and closing. For cargo drones with increasingly high service life requirements, the use cost and maintenance time will increase. In addition, there is a gap at the connection of this type of quick-release lock, and the rainproof performance is poor. When flying in the air, the area where the two doors are connected has no supporting structure, and the deformation will be larger under the action of aerodynamic load, which will increase the aerodynamic resistance.

[0004] Some cargo doors also use electric doors controlled by linear servos, which control the opening and closing movement of the doors by extending and shortening the linear servos. This structure will arrange smaller electric locks on the upper and lower door frames of the two doors close to the symmetry plane of the aircraft. This form requires two linear servos and two electric locks, and generally uses mature finished equipment, but the overall application cost is relatively high. Each time the door is closed or closed, a certain amount of power is consumed to operate the electronic control equipment. Summary of the invention

[0005] Technical issues to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present invention is aimed at the configuration of two doors symmetrically arranged at the rear of the fuselage of a small and medium-sized cargo UAV, and provides a mechanically operated UAV double-door mechanism to solve the problems that the existing double-door uses a cover lock structure with limited opening and closing life and is easy to be damaged, and the linear servo electric control structure has high cost and consumes power of the UAV.

[0007] The technical solution of the present invention is: a UAV double-opening door mechanism, which is provided with two groups, symmetrically installed on the inner sides of the left and right double-opening doors, and is used to control the opening and closing of the respective installed side doors; comprising:

[0008] The rotating shaft assembly has a main body fixed to the frame inside the door, close to the docking surface of the left and right doors; the control part is located outside the door, passes through the door and is connected to the rotating pin in the main body to prevent rotation, and is used to control the rotation of the rotating pin of the main body;

[0009] The latch assembly is a latch lock structure with two groups, which are fixed to the upper and lower ends of the inner side of the door facing each other and coaxially, and are 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 door, and the lower latch assembly is located at the lower end of the door; the latch assembly is used to lock or unlock the door;

[0010] The pull rod assembly comprises an upper pull rod assembly and a lower pull rod assembly, wherein the upper pull rod assembly connects 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 connects 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 to transfer the rotation of the rotating shaft assembly into the axial up and down movement of the latch in the latch assembly;

[0011] The inclined rod assembly is an elastic part installed in the cabin door. One end of the inclined rod assembly is connected to the cabin door inner frame, and the other end is connected to the rotating pin of the rotating shaft assembly to prevent the rotating pin from rotating freely when not in operation.

[0012] A further technical solution of the present invention is: the control part of the rotating shaft assembly is a handle, and the handle includes a pull ring, a mounting plate and a pin shaft; a pull ring is fixed on one side of the mounting plate for hand-held operation; a pin shaft is vertically arranged on the other side of the mounting plate, and 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 passes through the main part of the hatch insertion pin assembly, and a strip-shaped through hole that passes through the shaft diameter is axially arranged at the thick pin shaft, which is used for anti-rotation connection with the rotating pin.

[0013] A further technical solution of the present invention is that the main body of the rotating shaft assembly includes a base and a rotating pin; the base is fixed to the frame inside the door, near the joint surface of the left and right doors, and is provided with a through rotating shaft hole perpendicular to the door, and the pin shaft of the handle passes through the door and is inserted into the rotating shaft hole;

[0014] The rotating pin is installed at the end of the base facing away from the hatch, and includes a sleeve and a bottom plate that are perpendicular to each other. The sleeve is inserted into the rotating shaft hole and is mounted on the pin shaft of the handle. The end of the sleeve is provided with a mounting hole that matches the strip through hole and radially penetrates the sleeve, and is used to pass a bolt and the pin shaft of the handle for anti-rotation fixing connection. The end of the bottom plate close to the upper latch assembly is connected to the upper pull rod assembly, and the end of the bottom plate close to the lower latch assembly is connected to the lower pull rod assembly.

[0015] A further technical solution of the present invention is: the main part of the rotating shaft assembly also includes a gasket, which is coaxially mounted on the outer diameter of the sleeve of the rotating pin and is located at the end of the sleeve, and its end surface facing the rotating pin bottom plate is abutted against the end surface of the rotating shaft hole of the base close to the cabin door; the gasket is provided with a radial through hole that matches the mounting hole of the sleeve and is used to pass the bolts connecting the sleeve and the pin shaft.

[0016] A further technical solution of the present invention is: the main part of the rotating shaft assembly also includes a spring assembly, and the spring assembly is used for the pin shaft of the handle to elastically move axially in the sleeve of the rotating pin; the spring assembly includes 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 to the end of the thin pin shaft, one end of the first spring is against the nut, and the other end is against the second limit platform set in the middle of the inner diameter of the sleeve.

[0017] A further technical solution of the present invention is that the main body of the rotating shaft assembly also includes two flange bushings, which are symmetrically installed at both ends of the rotating shaft hole of the base to prevent the rotating pin from wearing the rotating shaft hole.

[0018] A further technical solution of the present invention is: a stop pin is provided on the end surface of the bottom plate of the rotating pin facing the base, close to the mounting end of the upper pull rod assembly, and correspondingly, a corresponding first limit platform is provided on the base to cooperate with the stop pin, so as to limit the extreme position of the deflection of the connecting end of the upper pull rod assembly of the bottom plate toward the hinge of the cabin door.

[0019] A further technical solution of the present invention is: the upper latch assembly includes an upper latch support, an upper fixed sleeve and an upper latch, the upper latch support is fixedly installed on the upper door frame, the upper latch support is provided with a lock hole, and the lock hole opening faces downward; the upper fixed sleeve is fixed on the inner frame of the cabin door, located directly below the upper latch support, the upper fixed sleeve is used to pass the upper latch and guide it; one end of the upper latch is provided with a joint, and the joint is connected to the upper pull rod assembly by installing a single-ear joint; the other end of the upper latch is installed in the upper fixed sleeve, and when in the locked state, the end portion is inserted into the lock hole of the upper latch support, and when in the unlocked state, the end portion moves downward to disengage from the lock hole and into the upper fixed sleeve.

[0020] A further technical solution of the present invention is: the upper pull rod assembly and the lower pull rod assembly have the same structure, the difference being 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, with fork ear joints fixed at both ends; the fork ear joint at one end of the upper pull rod assembly is connected to a single ear joint fixed to the end of the upper latch through a pin shaft, and the fork ear joint at the other end is connected to a single ear joint fixed to the rotating pin base plate, close to one end of the upper latch pin assembly, through a pin shaft; the fork ear joint at one end of the lower pull rod assembly is connected to a single ear joint fixed to the end of the lower latch pin through a pin shaft, and the fork ear joint at the other end is connected to a single ear joint fixed to the rotating pin base plate, close to one end of the lower latch pin assembly, through a pin shaft.

[0021] A further technical solution of the present invention is: the inclined rod assembly comprises a double-ear telescopic rod, a single-ear sleeve and a second spring; the rod portion of the double-ear telescopic rod is embedded in the single-ear sleeve, and the two are axially telescopically butted; the second spring is sleeved on the outer diameters of the two, one end of the second spring is against the baffle at the double ears of the double-ear telescopic rod, and the other end is against the baffle at the single ear of the single-ear sleeve, and the second spring is in a compressed state;

[0022] The double-ear ends of the double-ear telescopic rod are connected to the bottom plate near the connection of the lower rod assembly through a pin, and the single-ear end of the single-ear sleeve is connected to a fixed support installed on the cabin frame through a pin.

[0023] Beneficial Effects

[0024] The beneficial effects of the present invention are as follows: the present invention provides a mechanically operated double-door mechanism for a configuration in which two doors are symmetrically arranged at the rear of a fuselage of a small or medium-sized cargo UAV. The two doors can be quickly unlocked and opened from the outside by turning a handle, and the opening speed is fast. The use of a spring greatly reduces the operating force, saving manpower. The adopted mechanism design has a clear motion principle, and the mechanical linkage design has high reliability. There is no obvious gap between the mechanism and the door, and the waterproof performance is good. The mechanism is connected to the metal frame of the door at multiple locations, and the connection is reliable. The mechanism is arranged on the left and right of the mating surfaces of the two doors, and is connected to the upper and lower door frames. The left and right doors have good rigidity at the seam, and the overall deformation of the door is small when closed in the air.

[0025] The present invention is a set of motion connecting rod mechanisms composed of a rotating shaft assembly, a latch assembly, a pull rod assembly, and an inclined pull rod assembly. It is a pure mechanical mechanism with stable functions, low cost, high service life, and good maintainability. The rotating shaft assembly is located at the main rotating axis of the entire connecting rod mechanism, and is also the unlocking part. The hatch door can be unlocked or locked by twisting the handle of the rotating shaft assembly, which is simple to operate. The locking part is implemented by the latch assembly, which avoids the limitation of the number of times the hatch lock is used and has a long service life; the latch assembly is installed in the hatch, does not occupy additional space, and ensures the airtightness of the hatch door and the threshold. The rotating shaft assembly and the latch assembly are connected by pulling the pull rod assembly, which has a simple structure and light weight, and can convert the rotation of the rotating shaft assembly into the up and down movement of the latch in the latch assembly to realize the switch lock. The latch assembly and the pull rod assembly designed relative to each other up and down have the function of simplifying the structure and linking up and down. The diagonal brace assembly further stabilizes the rotating shaft assembly. When the cabin door is locked, the diagonal brace assembly pushes the lower end of the bottom plate of the rotating pin in the rotating shaft assembly, and cooperates with the stop pin at the upper end of the bottom plate and the first limit platform to limit the rotation. This allows the rotating pin in the rotating shaft assembly to remain in a stable vertical state, thereby preventing the rotating pin from rotating at will and affecting the locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the installation position of the handle of the present invention as seen outside the cabin door;

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

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

[0029] Figure 4 It is a cross-sectional view of the installation of the rotating shaft assembly in the present invention;

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

[0031] Figure 6 It is a schematic diagram of the installation position relationship of the base, flange bushing and gasket in the present invention;

[0032] Figure 7 The three views of the structure of the rotating pin in the present invention;

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

[0034] Fig. 9 The three structural views of the handle in the present invention;

[0035] Fig.10It is a schematic diagram of the connection structure of the inclined tie rod assembly in the present invention;

[0036] Fig.11 It is a schematic diagram of the structure of the inclined tie rod assembly without the second spring in the present invention;

[0037] Fig.12 It is a schematic diagram of the structure of the upper latch assembly in the present invention;

[0038] Fig.13 It is a structural schematic diagram of the upper fixed sleeve in the present invention;

[0039] Fig.14 It is a schematic diagram of the installation of the upper pull rod assembly in the present invention;

[0040] Fig.15 The figure is a motion schematic diagram of the double-door mechanism of the UAV of the present invention, wherein a is the locked state of the mechanism and b is the unlocked state of the mechanism.

[0041] Description of reference numerals: 1. rotating shaft assembly, 11. handle, 111. pull ring, 112. mounting plate, 113. pin, 114. strip through hole, 115. thick pin, 116. thin pin, 12. base, 121. rotating shaft hole, 122. first limit platform, 123. web, 124, main mounting panel, 13. rotating pin, 131. sleeve, 132. bottom plate, 133. mounting hole, 134. second limit platform, 135. stop pin, 136. upper pull rod docking shaft hole, 137. lower pull rod docking shaft hole, 138. inclined pull rod docking shaft hole, 14. gasket, 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. Washer, 18. Flange bushing, 2. Upper latch assembly, 21. Upper latch support, 211. Lock hole, 22. Upper fixed sleeve, 221. Edge strip of upper fixed sleeve, 222. Axial hole of upper fixed sleeve, 23. Upper latch, 3. Lower latch assembly, 4. Upper tie rod assembly, 5. Lower tie rod assembly, 6. Diagonal tie rod assembly, 61. Double-ear telescopic tie rod, 62. Single-ear sleeve, 63. Second spring, 7. Door, 71. Left and right door docking surfaces, 72. Upper door frame, 73. Lower door frame, 74. Frame, 75. Door skin, 8. Fixed support, 9. Gooseneck hinge, 10. Rear fuselage. DETAILED DESCRIPTION

[0042] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] See also Figure 1 , 3 This embodiment provides a mechanically operated double-door mechanism for a configuration in which two doors are symmetrically arranged at the rear fuselage 10 of a small and medium-sized cargo drone. The door 7 is composed of a composite skin and a metal frame 74 crisscrossed inside. The left and right doors 7 are hinged to the door frames on both sides of the door through two sets of gooseneck hinges 9, and the door 7 opens to both sides along the rotating shaft of the gooseneck hinges 9. The double-door mechanism of the present invention is provided with two sets, which are symmetrically installed on the inner side of the left and right double-doors 7 and arranged near the door docking surface 71 to respectively control the opening and closing of the left and right doors 7. In the mechanism, except for the control part handle 11 that is exposed outside the door 7, the other components are all located inside the door 7, so that the left and right doors 7 can be opened together from the outside, with fast opening speed, small operating force, high reliability of the mechanism, good waterproof performance, good rigidity in the closed state in the air, and support for the door 7, so that the overall deformation of the door 7 is small.

[0045] See also Figure 3 This embodiment takes a set of door mechanisms installed on the left cabin door 7 (the left side when standing at the tail of the fuselage and facing the heading) as an example. The door mechanism includes a rotating shaft assembly 1, a latch assembly, a pull rod assembly and a diagonal pull rod assembly 6, which together form a set of motion link mechanisms. The latch assembly is provided with two groups, including an upper latch assembly 2 and a lower latch assembly 3 respectively installed at the upper and lower ends of the cabin door 7; the pull rod assembly includes an upper pull rod assembly 4 connecting the upper latch assembly 2 and the rotating shaft assembly 1, and a lower pull rod assembly 5 connecting the rotating shaft assembly 1 and the lower latch assembly 3. Specifically, the detailed structure of each component is described as follows:

[0046] See also Figure 4-9 The rotating shaft assembly 1 is fixed on the metal frame 74 in the hatch 7, and is both the main rotating axis of the entire connecting rod 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 joint assembly 16, a bolt assembly 17 and a flange bushing 18.

[0047] Specifically, the base 12 serves as a mounting support and is fixed on a frame 74 which is longitudinally arranged inside the hatch 7 and close to the left and right docking surfaces 71 of the hatch. A web 123 is provided on one side of the base 12, and bolts are passed through the web 123 to achieve a fixed connection with the frame 74, so that the main mounting panel 124 of the base is basically parallel to the hatch 7 at the mounting location of the base 12. A boss protrudes from the middle of the main mounting panel 124 of the base to both sides. At the center position of the boss, a shaft hole 121 is perpendicular to the main mounting panel 124 and passes through the boss. The shaft hole 121 is also basically perpendicular to the hatch skin 75 at the mounting position.

[0048] The handle 11 is a control component of the rotating shaft assembly 1, and includes a pull ring 111, a mounting plate 112, and a pin 113. The pull ring 111 is fixed on one side of the mounting plate 112, and the pull ring 111 is located outside the cabin door 7 for handheld operation. A pin 113 is vertically arranged on the other side of the mounting plate 112. The pin 113 is a stepped shaft, with a thick pin 115 at the end close to the mounting plate 112 and a thin pin 116 at the other end. The pin 113 penetrates the cabin door 7 and is inserted into the rotating shaft hole 121 of the base 12, and is anti-rotationally connected with the rotating pin 13 inserted into the rotating shaft hole 121 from the other end of the rotating shaft hole 121, and the rotation of the rotating pin 13 is controlled by the handle 11. A slot hole is provided on the cabin door 7, which is consistent with the shape of the mounting plate 112 and accommodates the mounting plate 112 to be embedded. The pin 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 113 is offset relative to the pull ring 111, that is, the pin 113 is located at the upper end of the pull ring 111 in a vertical state, which is convenient for rotating the pull ring 111. A strip-shaped through hole 114 that penetrates the axial diameter is axially provided at the thick pin 115, which is used for anti-rotation connection with the rotating pin 13 and can also realize axial movement of the pin 113.

[0049] The rotating pin 13 is installed at the end of the base 12 facing away from the hatch 7. The main body of the rotating pin 13 is a T-shaped structure, including a sleeve 131 and a bottom plate 132 that are perpendicular to each other. The sleeve 131 is located at the center of the bottom plate 132. The sleeve 131 is a hollow straight cylinder. The end of the sleeve 131 away from the bottom plate 132 is inserted into the rotating shaft hole 121, and at the same time is fitted on the outer diameter of the pin shaft 113 of the handle 11 and is clearance-matched therewith; the bottom plate 132 is a plate-like structure with a rhombus structure and 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 that matches the strip through hole 114 and radially penetrates the sleeve, which is used to realize the anti-rotation connection between the pin shaft 113 and the sleeve 131 through the bolt assembly 17. The outer diameter of the sleeve 131 is in clearance with the inner diameter of the shaft hole 121, and the sleeve 131 is rotated in the shaft hole 121 by rotating the handle 11. In order to reduce the wear of the sleeve 131 on the shaft hole 121, flange bushings 18 are installed at both ends of the shaft hole 121. The two flange bushings 18 are symmetrically installed at both ends of the shaft hole 121. The flange flanges of the flange bushings 18 are located outside the shaft hole 121 and contact the end surface of the bottom plate 132 facing the base 12. The flange bushings 18 play an anti-wear role and increase the service life of the rotating shaft assembly 1.

[0050] The washer 14 is coaxially sleeved on the outer diameter of the sleeve 131 of the rotating pin 13, and is located at the end of the sleeve 131 away from the bottom plate 132. The end passes through the shaft hole 121, and the end surface of the washer 14 facing the bottom plate 132 contacts the boss end surface of the shaft hole 121 close to the hatch 7. The washer 14 is provided with a through hole that matches the mounting hole 133 of the sleeve 131 and penetrates the radial direction, and is used for installation with the bolt assembly 17. Specifically, the bolt assembly 17 includes a bolt 171, a second nut 172 and a washer 173. The bolt 171 passes through the through hole of the washer 14, the mounting hole 133 of the sleeve 131 and the strip through hole 114 of the pin shaft 113, and is locked with the washer 173 and the second nut 172. The washer 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 gasket 14 remains unchanged. Due to the strip through hole 114 structure of the pin shaft 113, the pin shaft 113 can move axially, and cooperate with the spring assembly 15 installed at the end of the pin shaft 113 to elastically move along the axial direction of the pin shaft 113, so that the mounting plate 112 of the handle 11 is disengaged from the slot hole of the hatch 7, which facilitates the rotation of the handle 11.

[0051] The spring assembly 15 is used for the pin shaft 113 of the handle to move axially elastically in the sleeve 131 of the rotating pin 13, and provides an elastic reset function. The spring assembly 15 includes a first spring 151 and a first nut 152. The first spring 151 is sleeved on the outer diameter of the thin pin shaft 116. The end of the thin pin shaft 116 away from the thick pin shaft 115 is provided with an external thread. The first nut 152 is a hexagonal self-locking nut, which is threadedly connected to the end of the thin pin shaft 116. One end of the first spring 151 abuts against the first nut 152, and the other end abuts against the second limit platform 134 set on the inner diameter of the sleeve 131. When the hand pulls the handle 11 axially outward along the pull ring 111 along the pin shaft 113, the first spring 151 is squeezed, and the bar-shaped through hole 114 of the pin shaft 113 moves axially outward relative to the bolt 171, so that the handle 11 is pulled out. Figure 4 The figure shows the internal structure of the rotating shaft assembly 1 when the hatch 7 is locked. In this state, the first spring 151 is in a free state, the pull ring 111 and the bottom plate 132 of the rotating pin 13 are in a vertical and unidirectional state, and a set of single-ear joint assemblies 16 are respectively installed at the upper end and the lower end of the bottom plate 132, which are respectively used to connect with the upper pull rod assembly 4 and the lower pull rod assembly 5. The single-ear joint assembly 16 includes a single-ear joint 161 and a third nut 162. The rod of the single-ear joint 161 passes through the bottom plate 132 and is fixed by the third nut 162. The third nut 162 is a self-locking nut. Specifically, an upper pull rod docking shaft hole 136 is provided at the upper end of the bottom plate 132, and a lower pull rod docking shaft hole 137 is provided at the lower end of the bottom plate 132, both of which are used to install the single-ear joint 161.

[0052] See also Figure 3 , 12 -14, the latch assembly is a latch lock structure, with two groups, which are fixed to the upper and lower ends of the inner side of the hatch 7 facing each other and coaxially, and are 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, taking the upper latch assembly 2 as an example, the upper latch assembly 2 includes an upper latch support 21, an upper fixed sleeve 22 and an upper latch 23. The upper latch support 21 is fixedly mounted on the upper door frame 72 in the cabin door. The upper latch support 21 is provided with a lock hole 211, and the lock hole 211 opens downward, that is, toward the rotating shaft assembly 1. The upper fixed sleeve 22 is fixed on the frame 74 in the cabin door, and is located directly below the upper latch support 21. The upper fixed sleeve 22 is provided with two edge strips 221 along the axial direction, which are used to pass through the fastener and the frame 74 for fixed connection. The upper fixed sleeve 22 is provided with an axial hole 222 along the axial direction, which is used to pass through the upper latch 23. The upper fixed sleeve 22 plays a guiding role for the upper latch 23. One end of the upper latch 23 is a joint structure, and the joint is connected to one end of the upper pull rod assembly 4 through a vertically installed single-ear joint 161. The other end of the upper latch 23 is a bare rod end, which is installed in the upper fixed sleeve 22. When the upper latch assembly 2 is in the locked state, the upper latch 23 enters the light rod end of the upper fixed sleeve 22 and is inserted into the lock hole 211 of the upper latch support 21; when it is unlocked, the upper latch 23 enters the light rod end of the upper fixed sleeve 22 and moves downward to disengage from the lock hole 211 and move into the axial hole 222 of the upper fixed sleeve 22.

[0054] The structure of the lower latch assembly 3 is the same as that of the upper latch assembly 2, except for the installation orientation. The lower latch support of the lower latch assembly 3 is installed on the upper door frame 73, opposite to the upper latch support 21; the lower fixing sleeve of the lower latch assembly 3 is fixed to the frame 74 at the lower end of the door, located directly above the lower latch support, and the joint end of the lower latch is also connected to the lower pull rod assembly 5 by installing a single ear joint 161.

[0055] See also Figure 3 The pull rod assembly includes an upper pull rod assembly 4 and a lower pull rod assembly 5. The upper pull rod assembly 4 connects the latch of the upper latch assembly 2 and the upper end of the rotating pin 13, and the lower pull rod assembly 5 connects the latch of the lower latch assembly 3 and the lower end of the rotating pin 13. The pull rod assembly is used to transmit the rotation of the rotating pin 13 into the axial up and down movement of the latch in the latch assembly, thereby realizing the linkage of the rotating shaft assembly 1 and the lower latch assembly.

[0056] For details, see Fig.14 The upper rod assembly 4 and the lower rod assembly 5 have the same structure, and the difference is that the different lengths of the upper rod assembly 4 and the lower rod assembly 5 are determined according to the installation height of the rotating shaft assembly 1 on the cabin door. In this embodiment, the total length of the lower rod assembly 5 is greater than that of the upper rod assembly 4. Fig.14Taking the upper tie rod assembly 4 as an example, the upper tie rod assembly 4 is a straight connecting rod, and fork ear joints are fixed at both ends. The fork ear joint at one end of the upper tie rod assembly 4 is connected to the single ear joint 161 fixed to the end of the upper plug pin 23 through a pin shaft, and the fork ear joint at the other end is connected to the single ear joint 161 fixed to the upper end of the bottom plate 132 through a pin shaft. The fork ear joint at one end of the lower tie rod assembly 5 is connected to the single ear joint 161 fixed to the end of the lower plug pin through a pin shaft, and the fork ear joint at the other end is connected to the single ear joint 161 fixed to the lower end of the bottom plate 132 through a pin shaft.

[0057] See also Fig.10 , 11 The diagonal brace assembly 6 is an elastic member installed in the cabin door 7. One end of the diagonal brace assembly 6 is connected to the metal frame 74 in the cabin door 7, and the other end is connected to the rotating pin 13 of the rotating shaft assembly 1. The diagonal brace assembly 6 is used to prevent the rotating pin 13 from rotating freely when not in operation, so as to ensure the stability of the locked state of the mechanism.

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

[0059] When the hatch is locked, the bottom plate 132 of the rotating pin 13 is basically in a vertical state. Figure 5 , 7 , the lower end of the bottom plate 132 in this state is provided with a diagonal tie rod docking shaft hole 138, and the two ear ends of the diagonal tie rod assembly are connected by a pin shaft passing through the diagonal tie rod docking shaft hole 138. Since the second spring 63 is in a compressed state, a thrust 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 toward the fixed support 8 (that is, the hinged side of the cabin door 7). In order to limit the transitional deflection of the upper end of the bottom plate 132, a stop pin 135 is provided on the end surface of the bottom plate 132 of the rotating pin 13 facing the base 12, and correspondingly, a corresponding first limit platform 122 is provided on the base 12 to cooperate with the stop pin 135, thereby limiting the upper end of the bottom plate 132 from rotating to the limit position of the hinged end of the cabin door 7. The thrust of the diagonal tie rod assembly 6 cooperates with the rotation limit of the upper end of the bottom plate 132, so that the rotating pin 13 is in a stable state when the cabin door is locked, and the free rotation of the rotating pin 13 is avoided.

[0060] See also Fig.15When the double-opening door mechanism of the present invention is unlocked, the pull ring 111 of the handle 11 is pulled outward to the limit state from the outside of the door 7. At this time, the first nut 152 is fitted with the rotating pin 13, the first spring 151 is squeezed, and the mounting plate 112 is separated from the slot of the door skin 75. The pull ring 111 is rotated 90 degrees away from the left and right door docking surfaces 71. At this time, the rotating pin 13 rotates accordingly, driving the connecting rod mechanism composed of the upper tie rod assembly 4, the lower tie rod assembly 5 and the inclined tie rod assembly 6 to rotate around the axis of the rotating pin 13. The upper tie rod assembly 4 pulls the upper plug pin 23 in the upper plug pin assembly 2 downward, and the lower tie rod assembly 5 pulls the lower plug pin in the lower plug pin assembly 3 upward. The inclined tie rod assembly 6 is also further compressed, so that the upper and lower plug pins are moved in the direction away from their respective plug pin supports. The bare rod ends of the upper and lower plug pins are separated from the lock holes of the corresponding plug pin supports and enter their respective fixed sleeves. The door 7 is unlocked and opened immediately, and the left and right doors 7 are opened to both sides to a predetermined state.

[0061] When the double-door mechanism of the present invention is locked, the left and right doors 7 are closed, and the pull ring 111 of the handle 11 is rotated 90° from the outside of the door 7 toward the direction close to the left and right door docking surfaces 71, and the rotating pin 13 rotates accordingly, driving the connecting rod mechanism composed of the upper pull rod assembly 4, the lower pull rod assembly 5 and the inclined rod assembly 6 to move: the upper pull rod assembly 4 pushes the upper latch 23 in the upper latch assembly 2 upward, and the lower pull rod assembly 5 pushes the lower latch in the lower latch assembly 3 downward, and the upper latch 23 in the upper latch assembly 2 moves upward along the upper fixed sleeve 22 and enters the lock hole 211 of the upper latch support 21, and at the same time, the lower latch also enters the lock hole of the lower latch support. At this time, the inclined tie rod assembly 6 pushes the lower end of the bottom plate 132 of the rotating pin 13, so that the stop pin 135 at the upper end of the bottom plate 132 abuts against the first limit platform 122 of the bottom plate 12 to prevent excessive rotation, so that the bottom plate 132 is basically in a vertical state, that is, in its length direction, it is basically on the same vertical axis as the upper tie rod assembly 4 and the lower tie rod assembly 5, so as to maintain the stability of the rotating pin 13. Then press the pull ring 111 inward to reach the most extreme state, such as Figure 4 As shown, the mounting plate 112 is embedded in the slot of the hatch skin 75, the first spring 151 returns to a free state and moves, and the outer diameter of the bolt 171 of the bolt assembly 17 fits with the hole wall of the strip through hole 114 close to the mounting plate 112. At this time, the handle 11 reaches the state closest to the inner side of the hatch 7, and the hatch 7 is locked.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A double-door mechanism for an unmanned aerial vehicle, characterized in that: There are two groups, which are symmetrically installed on the inner sides of the left and right double-opening doors, and are used to control the opening and closing of the side doors installed respectively; the mechanism includes: The rotating shaft assembly has a main body fixed to the frame inside the door, close to the docking surface of the left and right doors; the control part is located outside the door, passes through the door and is connected to the rotating pin in the main body to prevent rotation, and is used to control the rotation of the rotating pin of the main body; The latch assembly is a latch lock structure with two groups, which are fixed to the upper and lower ends of the inner side of the door facing each other and coaxially, and are 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 door, and the lower latch assembly is located at the lower end of the door; the latch assembly is used to lock or unlock the door; The pull rod assembly comprises an upper pull rod assembly and a lower pull rod assembly, wherein the upper pull rod assembly connects 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 connects 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 to transfer the rotation of the rotating shaft assembly into the axial up and down movement of the latch in the latch assembly; The inclined rod assembly is an elastic part installed in the cabin door. One end of the inclined rod assembly is connected to the cabin door inner frame, and the other end is connected to the rotating pin of the rotating shaft assembly to prevent the rotating pin from rotating freely when not in operation.

2. The UAV double-door mechanism according to claim 1, characterized in that: The control part of the rotating shaft assembly is a handle, which includes a pull ring, a mounting plate and a pin; the pull ring is fixed on one side of the mounting plate for hand-held operation; a pin is vertically provided on the other side of the mounting plate, and the pin is a stepped shaft, with the end close to the mounting plate being a thick pin and the other end being a thin pin; the pin passes through the cabin door and is inserted into the main part of the rotating shaft assembly, and a strip-shaped through hole that passes through the shaft diameter is axially provided at the thick pin, which is used for anti-rotation connection with the rotating pin.

3. The UAV double-door mechanism according to claim 2, characterized in that: The main body of the rotating shaft assembly includes a base and a rotating pin; the base is fixed to the frame inside the door, near the docking surface of the left and right doors, and is provided with a through rotating shaft hole perpendicular to the door, and the pin shaft of the handle passes through the door and is inserted into the rotating shaft hole; The rotating pin is installed at the end of the base facing away from the hatch, and includes a sleeve and a bottom that are perpendicular to each other. The sleeve is inserted into the rotating shaft hole and is mounted on the pin shaft of the handle. The end of the sleeve is provided with a mounting hole that matches the strip through hole and radially penetrates the sleeve, and is used to pass the bolt and the pin shaft of the handle for anti-rotation fixing connection. The end of the bottom plate close to the upper pin assembly is connected to the upper pull rod assembly, and the end of the bottom plate close to the lower pin assembly is connected to the lower pull rod assembly.

4. The UAV double-door mechanism according to claim 3, characterized in that: The main body of the rotating shaft assembly also includes a gasket, which is coaxially mounted on the outer diameter of the sleeve of the rotating pin and is located at the end of the sleeve. Its end surface facing the bottom plate abuts against the end surface of the rotating shaft hole close to the cabin door. The gasket is provided with a radial through hole that matches the mounting hole of the sleeve and is used to pass the bolts connecting the sleeve and the pin shaft.

5. The UAV double-door mechanism according to claim 3, characterized in that: The main part of the rotating shaft assembly also includes a spring assembly, which is used for the pin shaft of the handle to move elastically axially in the sleeve of the rotating pin; the spring assembly includes 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 to the end of the thin pin shaft, one end of the first spring is against the first nut, and the other end is against the second limit platform set in the middle of the inner diameter of the sleeve.

6. The UAV double-door mechanism according to claim 3, characterized in that: The main body of the rotating shaft assembly also includes two flange bushings, which are symmetrically installed at the two ends of the rotating shaft hole of the base to prevent the rotating pin from wearing the rotating shaft hole.

7. The UAV double-door mechanism according to claim 3, characterized in that: A stop pin is provided on the end surface of the bottom plate of the rotating pin facing the base, close to the connection end with the upper pull rod assembly. Correspondingly, a corresponding first limit platform is provided on the base to cooperate with the stop pin to limit the extreme position of the deflection of the connection end of the upper pull rod assembly of the bottom plate toward the hinged end of the cabin door.

8. The UAV double-door mechanism according to claim 3, characterized in that: The upper latch assembly includes an upper latch support, an upper fixed sleeve and an upper latch, wherein the upper latch support is fixedly mounted on the upper door frame, the upper latch support is provided with a lock hole, and the lock hole opening faces downward; the upper fixed sleeve is fixed on the frame inside the cabin door, and is located directly below the upper latch support, the upper fixed sleeve is used to pass the upper latch and guide it; one end of the upper latch is provided with a joint, and the joint is connected to the upper pull rod assembly by installing a single-ear joint; the other end of the upper latch is inserted into the upper fixed sleeve, and when in the locked state, the end portion is inserted into the lock hole of the upper latch support, and when in the unlocked state, the end portion moves downward to disengage from the lock hole and into the upper fixed sleeve.

9. The UAV double-door mechanism according to claim 8, characterized in that: The upper pull rod assembly and the lower pull rod assembly have the same structure, the difference being 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, with fork ear joints fixed at both ends; the fork ear joint at one end of the upper pull rod assembly is connected to a single ear joint fixed to the end of the upper latch through a pin, and the fork ear joint at the other end is connected to a single ear joint fixed to the base plate and close to the upper latch assembly through a pin; the fork ear joint at one end of the lower pull rod assembly is connected to a single ear joint fixed to the end of the lower latch through a pin, and the fork ear joint at the other end is connected to a single ear joint fixed to the base plate and close to the lower latch assembly through a pin.

10. The UAV double-door mechanism according to claim 3, characterized in that: The inclined rod assembly comprises a double-ear telescopic rod, a single-ear sleeve and a second spring; the rod portion of the double-ear telescopic rod is embedded in the single-ear sleeve, and the two are axially telescopically butted; the second spring is sleeved on the outer diameters of the two, one end of the second spring is against the baffle at the double ears of the double-ear telescopic rod, and the other end is against the baffle at the single ear of the single-ear sleeve, and the second spring is in a compressed state; The double-ear ends of the double-ear telescopic rod are connected to the bottom plate near the connection of the lower rod assembly through a pin, and the single-ear end of the single-ear sleeve is connected to a fixed support installed on the cabin door frame through a pin.

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