Lock pin device, lock pin type throwing opening cover and using method of lock pin type throwing opening cover

Abstract

The invention relates to the technical field of aircraft structure design, in particular to a lock pin device, a lock pin type jettisonable covering cap and a using method of the lock pin type jettisonable covering cap, and the lock pin type jettisonable covering cap comprises a front end frame part, a rear end frame part, a longitudinal beam frame part, a parachute hatch covering cap part and the lock pin device; the front-end frame piece and the rear-end frame piece are fixedly connected through the longitudinal beam frame piece, and the lock pin device is installed on the front-end frame piece. The rear side of the parachute hatch cover piece is mechanically clamped with an insertion lug hole in the rear end frame piece through a cover insertion lug; the front side of the parachute hatch cover piece is mechanically matched with the lock pin device through the locking reinforcing rib; and the lock pin device is fixedly connected with the front-end frame piece after being locked and tensioned. According to the technical scheme, the locking safety is good, the surface quality / pneumatic performance is good, the ejection reliability is high, the structure is easy and convenient to use and maintain, interchangeable use can be achieved, and the practical value of wide popularization is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft structure design, and in particular to a locking pin device, a locking pin type disposable cover and a use method thereof. Background Art

[0002] With the gradual diversification of the missions and uses of unmanned aircraft, the design of unmanned aircraft is required to continuously expand the restrictions on their use, and among the restrictions on use, the take-off and landing conditions are the primary restrictions. Except for rotorcraft unmanned aircraft and some small unmanned aircraft, all unmanned aircraft models that have been successfully used or tested currently use wheeled take-off and landing methods, which restricts the use of unmanned aircraft to airports and endurance.

[0003] Therefore, UAV catapult launch and parachute recovery have become an important direction for the current development of UAV technology. The successful application of this take-off, landing and recovery method will make the use of UAVs no longer limited by airport conditions and flight range, but can directly transport UAVs to the required use environment for launch, recovery and completion of missions.

[0004] In the prior art, the Chinese patent document with publication number CN106335627A discloses a disposable cover, which only states that the front end of the cover uses a rope or chain as a restraint, but does not provide a specific implementation method; the front end is fixed with a rope, which is easy to loosen, which is not conducive to aerodynamic performance and poses a safety hazard; the rear end of the cover is not overlapped with the body, which has a water leakage problem, and there is a risk of jamming after the cover is overlapped with the existing latch form. In addition, the Chinese patent document with publication number CN111717374A discloses a disposable cover structure for small and medium-sized UAVs with airbag landing, in which the front end of the cover is provided with an ear piece in the cabin, and the rope passes through the ear piece and is fixed to the front frame, and the rope and cutter are located in the cabin, which interfere with the airbag in the cabin and pose a safety hazard; and the looseness of the rope will cause the front end of the cover to sink, and when the amount of sinking is greater than the thickness of the cover, the airflow blows into the cabin and causes the cover to fall off abnormally, which poses a safety hazard.

[0005] For parachute recovery of UAVs, due to the special functions of the parachute hatch cover, the design of the parachute hatch cover has become one of the main difficulties in the structural system design. The main difficulties are as follows: 1) As part of the fuselage shape and one of the decisive factors affecting flight safety, the parachute hatch cover is required to maintain good locking safety and aerodynamic surface quality under various flight conditions; 2) The hatch cover is a prerequisite for the success of the parachute landing. It must be opened accurately and quickly at a specific moment and quickly separated from the aircraft and the parachute opening range; 3) For drones that are recycled, their parachute hatch covers need to be replaced with spare parts after each ejection, and their installation and disassembly structures are required to be interchangeable and easy to use and maintain. Summary of the invention

[0006] In view of the deficiencies of the above-mentioned existing technologies, the present invention discloses a locking pin device, a locking pin type disposable cover and its usage method, which are specifically as follows: A locking pin device includes a base, a spring assembly, a locking rope and a plug pin member. The base includes a mounting plate, a component combination bin and a bin body cover plate; the component combination bin is integrally formed on the front side of the mounting plate, and the front side of the component combination bin is open; the bin body cover plate covers the opening of the component combination bin and is fixedly connected to the component combination bin; a pin head perforation is provided on the bin body cover plate, and a pin rod perforation is provided on the mounting plate; a top perforation and a bottom perforation are respectively provided on the top plate and the bottom plate of the component combination bin. The plug pin member is disposed inside the component combination bin and includes an integrally formed pin head structure and a pin rod structure, a spring compression structure and a radial rope passing hole are provided between the pin heads; the pin head structure is inserted into the pin head perforation and is in clearance fit with the pin head perforation; the pin rod structure is inserted into the pin rod perforation and is in clearance fit with the pin rod perforation. The spring assembly is disposed inside the component combination bin and is axially clamped between the spring compression structure and the mounting plate; one end of the locking rope sequentially passes through the bottom perforation, the radial rope passing hole and the top perforation and is fixed at a rope fixing point on the top plate of the component combination bin; the other end of the locking rope is fixedly connected to the pulling rope fixing assembly.

[0007] Preferably, the spring compression structure is a clamping step with a diameter larger than that of the spring assembly, and the spring assembly is sleeved on the pin rod structure.

[0008] Preferably, the spring compression structure is a compression spring plate, and the plug pin member further includes a rope passing body; the pin head structure is fixed on the front side of the compression spring plate, the pin rod structure is fixed on the rear side of the compression spring plate through the rope passing body, and the radial rope passing hole is provided on the rope passing body.

[0009] Preferably, a spring core shaft is disposed inside the component combination bin, and the spring core shaft is fixed on the mounting plate; the spring assembly is sleeved on the spring core shaft and is clamped between the mounting plate and the compression spring plate, and an embedded spring groove is provided on the compression spring plate.

[0010] Preferably, it further includes a pulling rope fixing assembly, and the suspended end of the locking rope is fixedly connected to the pulling rope fixing assembly; the pulling rope fixing assembly includes a tensioning bolt and a locking nut; the locking nut is detachably connected to the screw rod of the tensioning bolt; the locking rope is fixedly connected to the nut of the tensioning bolt.

[0011] A latch-type jettisonable hatch cover includes a front-end frame member, a rear-end frame member, a longitudinal beam frame member, and a nacelle hatch cover member, and also includes the aforementioned latch device. The front-end frame member and the rear-end frame member are arranged in parallel and fixedly connected through the longitudinal beam frame member. At a position near the rear side of the bottom of the nacelle hatch cover member, a hatch cover lug is installed, and a lug hole is correspondingly opened on the rear-end frame member; the hatch cover lug is matched with the lug hole so that the rear side of the nacelle hatch cover member is clamped with the rear-end frame member. At a position near the front side of the bottom of the nacelle hatch cover member, a locking reinforcing rib is installed, and a pin hole is opened on the locking reinforcing rib, and a pin-through hole is correspondingly opened on the front-end frame member. The base of the latch device is installed on the front-end frame member corresponding to the pin-through hole; after the pin rod structure of the latch device passes through the pin-through hole, it is inserted into the pin hole; after one end of the locking rope of the latch device that is suspended is tightened, it is fixedly connected to the front-end frame member.

[0012] Preferably, a limiting block is provided at the top of the front-end frame member, and a clamping notch is correspondingly opened on the front side of the nacelle hatch cover member.

[0013] Preferably, an electric control cutter is connected to the locking rope.

[0014] A method for using a jettisonable hatch cover is a method for using the latch-type jettisonable hatch cover of this technical solution, including a hatch cover closing operation and a hatch cover opening operation.

[0015] The hatch cover closing operation includes the following steps: S11, after matching the hatch cover lug with the lug hole, close the nacelle hatch cover member; S12, check and adjust the matching state between the front side of the nacelle hatch cover member and the front-end frame member; S13, axially press the latch member based on the pin head structure, so that the spring assembly is compressed. After the pin rod structure passes through the pin-through hole, it is inserted into the pin hole on the locking reinforcing rib; S14, install an electric control cutter on the locking rope, and fix one end of the locking rope that is suspended on the front-end frame member in a tightened state.

[0016] The hatch cover opening operation includes the following steps: S21, after the aircraft control system determines that the nacelle hatch cover member needs to be opened, issue an opening command; S22, trigger the electric control cutter to cut the locking rope based on the opening command; S23, the latch member loses the restraint of the locking rope, and under the action of the spring assembly, the pin rod structure of the latch member withdraws from the pin hole on the locking reinforcing rib; S24, the front side of the nacelle hatch cover member bounces off the front-end frame member under the action of pneumatic suction. When the bouncing angle of the nacelle hatch cover member is greater than the limit angle of the matching between the hatch cover lug and the lug hole, the hatch cover lug disengages from the lug hole, and the nacelle hatch cover member is jettisoned.

[0017] Beneficial technical effects brought by the present invention: A pin-type ejectable hatch cover proposed by this technical solution, when in the closed state, both the front and rear ends of its nacelle hatch cover part adopt mechanical limits, which can ensure that the hatch cover is in the locked state under various flight conditions, with good safety; and because a pin device proposed by this technical solution is used, the loosening of the locking rope of the pin device will only reduce the protruding amount of the lock head structure and will not affect the joint and step difference between the nacelle hatch cover part and the adjacent structure, with good aerodynamic performance. When the pin-type ejectable hatch cover is in the closed state, the electric signal controls the cutter to cut off, and the pin quickly rebounds under the action of the spring, releasing the mechanical limit at the front end of the nacelle hatch cover part, and the nacelle hatch cover part bounces up under the action of aerodynamic suction to achieve accurate and timely ejection and opening. At present, the reliability of the cutter in the industry can reach 99.9%. Two groups of pin mechanisms are used for limiting, and the unlocking reliability of this hatch cover structure form can reach 99.8%, and it will increase with the continuous improvement of the cutter performance. In addition, during the use of this pin-type ejectable hatch cover, the nacelle hatch cover part, the pin device and its locking rope can be replaced as needed, and the operation and maintenance are simple, and it has the interchangeability for cyclic use. To sum up, this pin-type ejectable hatch cover structure has good locking safety, good surface quality / aerodynamic performance, high ejection reliability, and the structure is simple to use and maintain and can be interchangeably used, and has the practical value for wide promotion. Description of the drawings

[0018] Figure 1 Exploded structure schematic diagram of a pin device with a preferred structure; Figure 2 Axonometric view of a pin device with a preferred structure; Figure 3 Side structure schematic diagram of a pin device with a preferred structure; Figure 4 For Figure 3 A-A sectional structure schematic diagram; Figure 5 Exploded structure schematic diagram of a pin-type ejectable hatch cover with a preferred structure; Figure 6 Axonometric structure schematic diagram of a pin-type ejectable hatch cover with a preferred structure; Figure 7 Top view structure schematic diagram of a pin-type ejectable hatch cover with a preferred structure; Figure 8 For the hatch cover in the closed state corresponding to Figure 7 B-B sectional structure schematic diagram; Figure 9 For Figure 8 Enlarged structure schematic diagram at position C; Figure 10 For Figure 8 Enlarged structure schematic diagram at position D; Figure 11 It is a schematic cross-sectional structure view in the B-B direction corresponding to the state where the hatch cover is open; Figure 7 Figure 12 It is Figure 11 an enlarged view of part E of

[0019] In the figure: 1. Front-end frame member; 1.1 Fixed beam; 2. Rear-end frame member; 3. Longitudinal beam frame member; 4. Umbrella hatch cover member; 5. Lock pin device; 6. Hatch cover lug; 7. Lug hole; 8. Locking reinforcing rib; 9. Plug pin hole; 10. Pin-through hole; 11. Limited position block; 12. Clamping notch; 13. Electric cutting device; 14. Base; 14.1 Mounting plate; 14.2 Pin rod perforation; 14.3 Component combination bin; 14.31 Top plate; 14.32 Bottom plate; 14.33 Top perforation; 14.34 Bottom perforation; 14.35 Cable fixing point; 15. Bin body cover plate; 15.1 Pin head perforation; 16. Spring assembly; 17. Spring core shaft; 18. Locking cable; 19. Plug pin member; 19.1 Pin head structure; 19.2 Pin rod structure; 19.3 Radial cable-passing hole; 19.4 Compression spring plate; 19.5 Spring-embedding groove; 19.6 Cable-passing body; 20. Cable fixing assembly; 20.1 Tightening bolt; 20.2 Locking nut; 21. Connecting screw; 22. Mounting screw; 23. Connecting ear piece; 24. Thread-passing hole; 25. Mounting hole; 26. Countersunk head rivet. Specific implementation mode

[0020] To make the objectives, technical solutions and advantages of the invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention.

[0021] Therefore, the detailed description of the present invention provided in the accompanying drawings below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0022] Embodiment 1 This embodiment discloses a lock pin device. As a preferred implementation mode of the present invention, as Figure 2 shown, it includes a base 14, a spring assembly 16, a locking cable 18 and a plug pin member 19.

[0023] Among them, as Figure 1 ​As shown, the base 14 includes a mounting plate 14.1, a component combination bin 14.3, and a bin cover 15. The component combination bin 14.3 is integrally formed on the front side of the mounting plate 14.1, and the front side of the component combination bin 14.3 is open. Further, in order to reduce the weight of the device, the bin wall of the component combination bin 14.3 (including the top plate 14.31, the bottom plate 14.32, and two side plates) is designed with a hollow structure. The bin cover 15 covers the open part of the component combination bin 14.3 and is fixedly connected to the component combination bin 14.3. Specifically, connecting lugs 23 are correspondingly arranged on the bin cover 15 and the component combination bin 14.3, and through screw holes 24 are formed in the connecting lugs 23. By using mounting screws 22 to cooperate with the through screw holes 24 on the two connecting lugs 23, the bin cover 15 is fixedly connected to the component combination bin 14.3. A pin head through hole 15.1 is formed on the bin cover 15, and a pin rod through hole 14.2 is formed on the mounting plate 14.1; a top through hole 14.33 and a bottom through hole 14.34 are respectively arranged on the top plate 14.31 and the bottom plate 14.32 of the component combination bin 14.3.

[0024] The plug pin member 19 is arranged inside the component combination bin 14.3 and includes an integrally formed pin head structure 19.1 and a pin rod structure 19.2. A spring compression structure and a radial rope through hole 19.3 are arranged between the pin heads. The pin head structure 19.1 is inserted into the pin head through hole 15.1 and is in clearance fit with the pin head through hole 15.1; the pin rod structure 19.2 is inserted into the pin rod through hole 14.2 and is in clearance fit with the pin rod through hole 14.2. In this way, under the cooperation of the pin head through hole 15.1 and the pin rod through hole 14.2, the plug pin member 19 can only move axially. If the pin rod structure 19.2 and the pin head structure 19.1 are coaxial, without other structures, circumferential rotation may also occur.

[0025] The spring assembly 16 is arranged inside the component combination bin 14.3 and is axially clamped between the spring compression structure and the mounting plate 14.1. In this way, when the plug pin member 19 moves axially and the spring compression structure gradually approaches the mounting plate 14.1, the spring assembly 16 is axially compressed to store energy for later pin withdrawal. One end of the locking rope 18 sequentially passes through the bottom through hole 14.34, the radial rope through hole 19.3, and the top through hole 14.33 and is fixed at the rope fixing point 14.35 on the top plate 14.31 of the component combination bin 14.3; the other end of the locking rope 18 is suspended. When the suspended end of the locking rope 18 is tightened, the plug pin member 19 cannot rotate.

[0026] Based on the above-mentioned pin locking device, when it is applied to the structure of a disposable hatch cover, after the latch member 19 of the pin locking device 5 compresses the spring assembly 16, its pin rod structure 19.2 is used to lock the parachute compartment hatch cover member 4. By simply pulling the suspended end of the locking rope 18, the rapid locking of the parachute compartment hatch cover member 4 can be achieved. When it is necessary to throw out the parachute compartment hatch cover member 4, just cut the locking rope 18 to make the latch member 19 lose its restraint force. In this way, the latch member 19 withdraws from the parachute compartment hatch cover member 4 under the action of the spring assembly 16, realizing the rapid unlocking of the parachute compartment hatch cover member 4.

[0027] Embodiment 2 This embodiment discloses a pin locking device. As a preferred embodiment of the present invention, that is, based on Embodiment 1, its spring compression structure is a clamping step with a diameter larger than that of the spring assembly 16, and the spring assembly 16 is sleeved on the pin rod structure 19.2. For example: The latch member 19 may only include a pin head structure 19.1 and a pin rod structure 19.2. The diameter of the pin rod structure 19.2 is smaller than that of the spring assembly 16, and the diameter of the pin head structure 19.1 is larger than that of the spring assembly 16. The pin head structure 19.1 and the pin rod structure 19.2 are coaxially and integrally arranged. In this way, a clamping step is naturally formed between the pin head structure 19.1 and the pin rod structure 19.2, and the radial rope-passing hole 19.3 can be opened on the pin head structure 19.1.

[0028] Or, the clamping step is a separate structure, integrally formed between the pin head structure 19.1 and the pin rod structure 19.2, with a diameter larger than that of the spring assembly 16 and also larger than that of the pin head structure 19.1, which can prevent the latch member 19 from being ejected after losing its restraint force. In this way, if the clamping step has sufficient thickness, the radial rope-passing hole 19.3 can be opened on the clamping step. If the thickness of the clamping step is not enough, the radial rope-passing hole 19.3 can be opened on the pin head structure 19.1.

[0029] Embodiment 3 This embodiment discloses a pin locking device. As a preferred embodiment of the present invention, that is, based on Embodiment 1, as Figure 1 、 2 shown in Figures 3 and 4, its spring compression structure is a compression spring plate 19.4, and the latch member 19 further includes a rope-passing body 19.6; the pin head structure 19.1 is fixed to the front side of the compression spring plate 19.4, and the pin rod structure 19.2 is fixed to the rear side of the compression spring plate 19.4 through the rope-passing body 19.6, and the radial rope-passing hole 19.3 is opened on the rope-passing body 19.6.

[0030] Based on the structure of the plug member 19 described above, a spring core shaft 17 is provided inside the component combination bin 14.3, and the spring core shaft 17 is fixed to the mounting plate 14.1; the spring assembly 16 is sleeved on the spring core shaft 17 and is clamped between the mounting plate 14.1 and the compression spring plate 19.4. In order to prevent the central axis of the spring assembly 16 from bending and causing the spring assembly 16 to slip, a spring-embedded groove 19.5 is formed on the compression spring plate 19.4, and the front side of the spring assembly 16 is installed in the spring-embedded groove 19.5.

[0031] Based on the above structure, when the plug member 19 loses the restraint of the locking rope 18, the bin cover plate 15 plays a role in limiting the compression spring plate 19.4, and further realizes the limitation of the plug member 19. In this way, it can be achieved that: even if the plug member 19 loses the restraint of the locking rope 18, the spring assembly 16 still retains a compression amount of not less than 1 / 4, preventing the internal components of the locking pin device 5 from shaking and generating abnormal noises.

[0032] Embodiment 4 This embodiment discloses a locking pin device. As a preferred embodiment of the present invention, it includes a base 14, a spring assembly 16, a locking rope 18, a plug member 19, and a rope fixing assembly 20.

[0033] The base 14 includes a mounting plate 14.1, a component combination bin 14.3, and a bin cover plate 15; the component combination bin 14.3 is integrally formed on the front side of the mounting plate 14.1, and the front side of the component combination bin 14.3 is open; the bin cover plate 15 covers the opening of the component combination bin 14.3 and is fixedly connected to the component combination bin 14.3; a pin head perforation 15.1 is formed on the bin cover plate 15, and a pin rod perforation 14.2 is formed on the mounting plate 14.1; a top perforation 14.33 and a bottom perforation 14.34 are respectively provided on the top plate 14.31 and the bottom plate 14.32 of the component combination bin 14.3.

[0034] The plug member 19 is arranged inside the component combination bin 14.3 and includes an integrally formed pin head structure 19.1 and a pin rod structure 19.2. A spring compression structure and a radial rope hole 19.3 are provided between the pin heads; the pin head structure 19.1 is inserted into the pin head perforation 15.1 and is in clearance fit with the pin head perforation 15.1; the pin rod structure 19.2 is inserted into the pin rod perforation 14.2 and is in clearance fit with the pin rod perforation 14.2.

[0035] The spring assembly 16 is arranged inside the component combination bin 14.3 and is axially clamped between the spring compression structure and the mounting plate 14.1; one end of the locking rope 18 sequentially passes through the bottom perforation 14.34, the radial rope hole 19.3, and the top perforation 14.33 and is fixed at the rope fixing point 14.35 on the top plate 14.31 of the component combination bin 14.3; the other end of the locking rope 18 is fixedly connected to the rope fixing assembly 20.

[0036] The cable fixing assembly 20 includes a tensioning bolt 20.1 and a locking nut 20.2; the locking nut 20.2 is detachably connected to the screw of the tensioning bolt 20.1; the locking cable 18 is fixedly connected to the nut of the tensioning bolt 20.1.

[0037] Embodiment 5 This embodiment discloses a locking pin type disposable hatch cover. As a preferred embodiment of the present invention, as Figure 5 、 6 shown in FIGS. 6 and 7, it includes a front end frame member 1, a rear end frame member 2, a longitudinal beam frame member 3 and a parachute compartment hatch cover member 4, and also includes a locking pin device as disclosed in Embodiment 1, 2, 3 or 4.

[0038] The front end frame member 1 and the rear end frame member 2 are arranged in parallel and are fixedly connected by the longitudinal beam frame member 3.

[0039] A hatch cover lug 6 is installed at a position near the rear side of the bottom of the parachute compartment hatch cover member 4, and a lug hole 7 is correspondingly formed on the rear end frame member 2; the hatch cover lug 6 is matched with the lug hole 7 to make the rear side of the parachute compartment hatch cover member 4 be clamped with the rear end frame member 2. Specifically, as Figure 10 shown in FIG. 8, the hatch cover lug 6 is arc-shaped and bent, and forms an angle of R with the rear end of the parachute compartment hatch cover member 4. Further, the hatch cover lug 6 is fixed to the parachute compartment hatch cover member 4 by a countersunk head rivet 26. Among them, the hatch cover lug 6 is a machined part made of steel material, and the core element is that the matching section of the hatch cover lug 6 and the rear end frame member 2 is arc-shaped, and the axis of the arc is the tangent line of the rear contour line of the parachute compartment hatch cover member 4 and the horizontal plane, so as to avoid jamming during the rotation process of the parachute compartment hatch cover member 4. When the parachute compartment hatch cover member 4 is in the closed state, the hatch cover lug 6 should exceed the rear end frame member 2 by about R / 4.

[0040] A locking reinforcing rib 8 is installed at a position near the front side of the bottom of the parachute compartment hatch cover member 4, and a pin hole 9 is formed on the locking reinforcing rib 8, and a pin hole 10 is correspondingly formed on the front end frame member 1.

[0041] The front-end frame member 1 is a machined part that provides an installation interface for the locking pin device 5. The base 14 of the locking pin device 5 is installed on the front-end frame member 1 corresponding to the pin hole 10. Specifically, mounting holes 25 are formed in the mounting plate 14.1 of the base 14, and the base 14 of the locking pin device 5 is partially fixed to the front-end frame member 1 through the cooperation of mounting screws 22 and the mounting holes 25. At this time, the pin rod structure 19.2 of the locking pin device 5 is coaxial with the pin hole 10 on the front-end frame member 1. Press the pin head structure 19.1 of the locking pin device 5, and the entire plug pin member 19 can be axially moved, compressing the spring assembly 16. After the pin rod structure 19.2 of the plug pin member 19 passes through the pin hole 10, it is inserted into the pin hole 9. Under this condition, the free end of the tensioning locking rope 18 is tightened and fixed to the front-end frame member 1. Specifically, a pull rope fixing assembly 20 is connected to the free end of the locking rope 18. The pull rope fixing assembly 20 includes a tensioning bolt 20.1 and a locking nut 20.2; the locking nut 20.2 is detachably connected to the screw rod of the tensioning bolt 20.1; the locking rope 18 is fixedly connected to the nut of the tensioning bolt 20.1. Based on this structure, first remove the locking nut 20.2, pass the tensioning bolt 20.1 through the fixed beam 1.1 of the front-end frame member 1, and then tighten it with the locking nut 20.2.

[0042] Furthermore, a limiting block 11 is provided at the top of the front-end frame member 1, and a positioning notch 12 is correspondingly formed on the front side of the parachute compartment hatch cover member 4. In this way, the forward sliding of the parachute compartment hatch cover member 4 can be prevented. In addition, when closing the parachute compartment hatch cover member 4, the parachute compartment hatch cover member 4 can be quickly installed in place, ensuring that the pin hole 9 and the pin hole 10 are quickly coaxial without adjustment.

[0043] Furthermore, an electric cutting device 13 is connected to the locking rope 18 to meet the requirements of electric cutting.

[0044] Embodiment 6 This embodiment discloses a usage method of a throwable hatch cover. As a preferred embodiment of the present invention, it is a usage method of a locking pin type throwable hatch cover described in Embodiment 5, including a hatch cover closing operation and a hatch cover opening operation.

[0045] The hatch cover closing operation includes the following steps: S11, after mating the hatch cover lugs 6 with the lug holes 7, close the parachute compartment hatch cover member 4.

[0046] S12, check and adjust the mating state between the front side of the parachute compartment hatch cover member 4 and the front-end frame member 1 to ensure that the limiting block 11 and the positioning notch 12 are in a mating state.

[0047] S13. Axially press the plug-in member 19 based on the pin head structure 19.1, so that the spring assembly 16 is compressed. After the pin rod structure 19.2 passes through the pin hole 10, it is inserted into the pin hole 9 on the locking rib 8. After this step, the front end of the pin head structure 19.1 is basically flush with the bin cover 15 (the protruding amount < 1 mm).

[0048] S14. Install the electric control cutter 13 on the locking rope 18, and fix the suspended end of the locking rope 18 on the front end frame member 1 in the state where the locking rope 18 is tightened.

[0049] The locked pin type disposable hatch cover after closing is as Figure 8 、 9 and shown in Figure 10.

[0050] The hatch cover opening operation includes the following steps: S21. After the aircraft control system determines that the parachute compartment hatch cover member 4 needs to be opened, send an opening command.

[0051] S22. Trigger the electric control cutter 13 to cut the locking rope 18 based on the opening command.

[0052] S23. The plug-in member 19 loses the restraint of the locking rope 18. Under the action of the spring assembly 16, the pin rod structure 19.2 of the plug-in member 19 exits the pin hole 9 on the locking rib 8, as Figure 12 shown in Figure 11.

[0053] S24. As Figure 11 shown in Figure 12, the front side of the parachute compartment hatch cover member 4 bounces off the front end frame member 1 under the action of pneumatic suction. When the bouncing angle of the parachute compartment hatch cover member 4 is greater than the limit angle of the cooperation between the hatch cover lug 6 and the lug hole 7, the hatch cover lug 6 disengages from the lug hole 7, and the parachute compartment hatch cover member 4 is thrown out, that is, the parachute compartment hatch cover member 4 is projected towards the rear upper part of the fuselage under the action of aerodynamic force far greater than its own weight.

[0054] Among them, the limit angle of the cooperation between the hatch cover lug 6 and the lug hole 7 is determined by the angle R between the hatch cover lug 6 and the rear end of the parachute compartment hatch cover member 4. This angle can be set as needed. For example, in this technical solution, the limit angle can be set to 12°. That is, when the front bouncing angle of the parachute compartment hatch cover member 4 is greater than 12°, the hatch cover lug 6 can disengage from the lug hole 7.

Claims

1. A locking pin device, characterized in that: It comprises a base (14), a spring assembly (16), a locking rope (18) and a latch member (19); The base (14) comprises a mounting plate (14.1), a component assembly bin (14.3) and a bin cover (15); the component assembly bin (14.3) is integrally formed on the front side of the mounting plate (14.1), and the front side of the component assembly bin (14.3) is open; the bin cover (15) covers the open portion of the component assembly bin (14.3) and is fixedly connected to the component assembly bin (14.3); a pin head through hole (15.1) is provided on the bin cover (15), and a pin rod through hole (14.2) is provided on the mounting plate (14.1); a top through hole (14.33) and a bottom through hole (14.34) are provided on the top plate (14.31) and the bottom plate (14.32) of the component assembly bin (14.3), respectively; The latch member (19) is arranged inside the component assembly bin (14.3), and comprises an integrally formed pin head structure (19.1) and a pin rod structure (19.2), wherein a spring compression structure and a radial rope threading hole (19.3) are arranged between the pin heads; the pin head structure (19.1) is inserted into the pin head through hole (15.1) and is clearance-matched with the pin head through hole (15.1); the pin rod structure (19.2) is inserted into the pin rod through hole (14.2) and is clearance-matched with the pin rod through hole (14.2); The spring assembly (16) is arranged inside the component assembly bin (14.3) and is axially clamped between the spring compression structure and the mounting plate (14.1); one end of the locking rope (18) passes through the bottom through hole (14.34), the radial rope through hole (19.3) and the top through hole (14.33) in sequence, and is then fixed to a rope fixing point (14.35) on the top plate (14.31) of the component assembly bin (14.3); the other end of the locking rope (18) is suspended in the air.

2. A locking pin device as claimed in claim 1, characterized in that: The spring compression structure is a locking step having a diameter greater than a diameter of the spring assembly (16), and the spring assembly (16) is sleeved on the pin rod structure (19.2).

3. A locking pin device as claimed in claim 1, characterized in that: The spring compression structure is a compression spring plate (19.4), and the latch member (19) further comprises a rope threading body (19.6); the pin head structure (19.1) is fixed to the front side of the compression spring plate (19.4), the pin rod structure (19.2) is fixed to the rear side of the compression spring plate (19.4) through the rope threading body (19.6), and a radial rope threading hole (19.3) is provided on the rope threading body (19.6).

4. A locking pin device as claimed in claim 3, characterized in that: A spring core shaft (17) is arranged inside the component assembly bin (14.3), and the spring core shaft (17) is fixed on the mounting plate (14.1); the spring assembly (16) is sleeved on the spring core shaft (17) and clamped between the mounting plate (14.1) and the compression spring plate (19.4), and a spring insertion groove (19.5) is provided on the compression spring plate (19.4).

5. A locking pin device as claimed in claim 3, characterized in that: It also includes a pull rope fixing assembly (20), and one suspended end of the locking rope (18) is fixedly connected to the pull rope fixing assembly (20); the pull rope fixing assembly (20) includes a tensioning bolt (20.1) and a locking nut (20.2); the locking nut (20.2) is detachably connected to the screw rod of the tensioning bolt (20.1); and the locking rope (18) is fixedly connected to the nut of the tensioning bolt (20.1).

6. A lock pin type disposable cover, characterized in that: It comprises a front frame member (1), a rear frame member (2), a longitudinal beam frame member (3) and an umbrella hatch cover member (4), and also comprises a locking pin device as claimed in any one of claims 1 to 5; The front frame member (1) and the rear frame member (2) are arranged in parallel and are fixedly connected via a longitudinal beam frame member (3); A cover ear (6) is installed at a position near the rear side of the bottom of the umbrella hatch cover (4), and a corresponding ear insertion hole (7) is opened on the rear end frame member (2); the cover ear (6) cooperates with the ear insertion hole (7) so that the rear side of the umbrella hatch cover (4) is snap-fitted with the rear end frame member (2); A locking reinforcement rib (8) is installed at a position near the front side of the bottom of the umbrella hatch cover (4), and a pin hole (9) is provided on the locking reinforcement rib (8), and a corresponding pin hole (10) is provided on the front frame member (1); The base (14) of the locking pin device (5) is mounted on the front frame member (1) corresponding to the pin hole (10); the pin rod structure (19.2) of the locking pin device (5) passes through the pin hole (10) and is inserted into the pin hole (9); and the locking rope (18) of the locking pin device (5) is fixedly connected to the front frame member (1) after the suspended end thereof is tightened.

7. A pin-type disposable cover as claimed in claim 6, characterized in that: A limiting block (11) is provided on the top of the front frame member (1), and a corresponding positioning notch (12) is provided on the front side of the umbrella hatch cover member (4).

8. A pin-type disposable cover as claimed in claim 6, characterized in that: The locking rope (18) is connected to an electric-controlled cutter (13).

9. A method for using a disposable lid, characterized in that: A method for using a pin-type disposable lid as described in any one of claims 6 to 8, including a lid closing operation and a lid opening operation; The flap closing operation comprises the following steps: S11, after the hatch cover ear (6) is matched with the ear hole (7), the umbrella hatch cover (4) is closed; S12, checking and adjusting the matching state between the front side of the umbrella hatch cover (4) and the front end frame member (1); S13, based on the pin head structure (19.1), the latch member (19) is axially pressed, so that the spring assembly (16) is compressed, and the pin rod structure (19.2) passes through the pin hole (10) and is inserted into the latch hole (9) on the locking reinforcement rib (8); S14, installing the electric-controlled cutter (13) on the locking rope (18), and fixing the suspended end of the locking rope (18) to the front frame member (1) while the locking rope (18) is tightened; The flap opening operation comprises the following steps: S21, after the aircraft control system determines that the parachute hatch cover (4) needs to be opened, a hatch opening command is issued; S22, triggering the electric-controlled cutter (13) to cut the locking rope (18) based on the hatch opening instruction; S23, the latch member (19) loses the restraining force of the locking rope (18), and under the action of the spring assembly (16), the pin rod structure (19.2) of the latch member (19) exits the latch hole (9) on the locking reinforcement rib (8); S24, the front side of the umbrella hatch cover (4) is bounced up and away from the front frame member (1) under the action of the pneumatic suction force. When the bounce angle of the umbrella hatch cover (4) is greater than the limit angle of the cover plug ear (6) and the plug ear hole (7), the cover plug ear (6) is separated from the plug ear hole (7), and the umbrella hatch cover (4) is thrown out.

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