Opening device of drag parachute cabin door of lower parachute cabin and using method

Abstract

The invention discloses an opening device of a drag parachute cabin door of a lower parachute cabin and a using method. The opening device comprises the cabin door, a driving mechanism and a door bolt mechanism. The cabin door is installed at the opening position of the drag parachute containing groove and used for sealing the opening position of the drag parachute containing groove, the driving mechanism is installed on a front wall plate of the drag parachute containing groove through an inner support of the driving mechanism, the door bolt mechanism is installed in the cabin door in a penetrating mode in the course direction, and one end of the door bolt mechanism is associated with the driving mechanism. The door bolt mechanism is controlled by the driving mechanism 3 to open and close the cabin door; the front lock seat and the rear lock seat are correspondingly installed on the inner sides of a front wall plate and a rear wall plate of the drag parachute containing groove, the lock pin assembly penetrates through the cabin door in the course direction, a front lock pin in the lock pin assembly penetrates through a front side plate of a box-shaped piece in the cabin door and then is inserted into the front lock seat, and a rear lock pin in the lock pin assembly penetrates through a rear side plate of the box-shaped piece in the cabin door and then is inserted into the rear lock seat. The front lock pin and the rear lock pin are hinged to the middle crank through hinged connecting rods respectively, the front lock pin is sleeved with a compressed spring, one end of the compressed spring is fixedly connected with the axial designated position of the front lock pin, the other end of the compressed spring is fixed to the designated position of the cabin door through a support, and pressing force is provided for the front lock pin and the rear lock pin through the compressed spring so that the front lock pin can be pushed into the front lock seat. And the rear lock pin is pushed into the rear lock seat, so that a locking state when the cabin door is closed is realized. The drag parachute cabin door opening device solves the problems that an existing drag parachute cabin door opening device is mostly in a hydraulic mode, a pneumatic mode and the like and is complex in structure, large in occupied space, low in reliability and the like.

Description

Technical Field

[0001] The present invention relates to the field of, but is not limited to, aircraft structure design technology, and in particular to an opening device for a drag parachute door of a lower parachute compartment and a use method thereof. Background Art

[0002] The drag parachute in the lower parachute compartment is an aerodynamic deceleration device installed in the drag parachute placement slot at the lower part of the tail of the aircraft. During the landing process, the pilot presses the parachute release button, the drag parachute compartment door opening device works, the parachute compartment door is opened, and the drag parachute is released under its own weight and immediately fully expands to generate huge resistance to assist the wheel brake to slow down the aircraft, shorten the landing run distance of the aircraft, and increase the service life of the wheel and its brake device. The drag parachute can also be released to abort the takeoff when the takeoff fails to ensure flight safety.

[0003] At present, the existing drag parachute door opening devices at home and abroad are mostly hydraulic, pneumatic and other forms, and have problems such as complex structure, large space occupation and low reliability. Summary of the invention

[0004] Purpose of the invention: In order to solve the above-mentioned technical problems, an embodiment of the present invention provides an opening device and a method for using a lower parachute compartment drag parachute door, so as to solve the problems that the existing drag parachute compartment door opening devices are mostly in the form of hydraulic, pneumatic, etc., have complex structures, occupy a large space, and have low reliability.

[0005] Technical solution of the present invention: In a first aspect, an embodiment of the present invention provides an opening device for a drag parachute door of a lower parachute compartment, wherein a drag parachute placement slot 1 embedded in the aircraft body is provided at the door opening position of the aircraft body for placing the drag parachute; the opening device for the drag parachute door of the lower parachute compartment comprises: a door 2, a driving mechanism 3, and a door bolt mechanism 4;

[0006] The hatch door 2 is installed at the opening position of the drag parachute placement slot 1 to close the opening position of the drag parachute placement slot 1. The driving mechanism 3 is installed on the front wall plate of the drag parachute placement slot 1 through its internal bracket 10. The bolt mechanism 4 is installed inside the hatch door 2 along the heading, and one end of the bolt mechanism 4 is associated with the driving mechanism 3, so that the bolt mechanism 4 is controlled by the driving mechanism 3 to realize the hatch door opening and hatch door closing;

[0007] The bolt mechanism 4 includes: a front lock seat 14 and a rear lock seat 27 correspondingly installed on the inner sides of the front and rear wall plates of the drag parachute placement slot 1, a lock pin assembly passing through the cabin door 2 along the course, a front lock pin 19 in the lock pin assembly passing through the front side plate of the box-shaped part in the cabin door 2 and then inserted into the front lock seat 14, and a rear lock pin 25 in the lock pin assembly passing through the rear side plate of the box-shaped part in the cabin door 2 and then inserted into the rear lock seat 27, the front lock pin 19 and the rear lock pin 25 are respectively hinged to the intermediate crank 23 through a hinged connecting rod, and the front lock pin 19 is sleeved with a compression spring 17, one end of the compression spring 17 is fixedly connected to the axial designated position of the front lock pin 19, and the other end is fixed to the designated position of the cabin door 2 through a support seat, and the compression spring 17 provides a clamping force to the front lock pin 19 and the rear lock pin 25, so as to push the front lock pin 19 into the front lock seat 14 and the rear lock pin 25 into the rear lock seat 27, so as to realize the locked state when the cabin door 2 is closed.

[0008] Optionally, the opening device of the lower parachute compartment drag parachute door as described above,

[0009] The hatch 2 is installed at the opening position of the drag parachute placement slot 1 through hinges, and the hatch includes an inner box-shaped part, an outer skin, and a partition arranged between the inner box-shaped part and the outer skin. The inner box-shaped part is formed by pressing an aluminum alloy plate; the plate bent partition arranged between the inner box-shaped part and the outer skin plays a reinforcing role.

[0010] Optionally, in the above-mentioned opening device of the lower parachute compartment drag parachute door, the door bolt mechanism 4 includes: a front lock seat 14, a front lock pin support 15, a retaining ring 16, a compression spring 17, a limit support 18, a front lock pin 19, a front connecting rod 20, a crank 23, a rear connecting rod 24, a rear lock pin 25, a rear lock pin support 26, and a rear lock seat 27, which are arranged in sequence from front to rear along the heading direction;

[0011] Among them, the front lock seat 14 and the rear lock seat 27 are respectively fixedly installed on the front and rear wall inner sides of the drag parachute placement slot 1, the front lock pin support 15 and the rear lock pin support 26 are respectively fixedly installed on the front and rear ends of the inner box-shaped member in the cabin door 2, the front end of the front lock pin 19 passes through the through hole of the front lock pin support 15, and moves in the through holes of the front lock pin support 15 and the front lock seat 14 along the heading, and the rear lock seat 27 passes through the through hole of the rear lock pin support 26, and moves in the through holes of the rear lock pin support 26 and the rear lock seat 27 along the heading;

[0012] The front locking pin 19 and the front connecting rod 20, the front connecting rod 20 and the crank 23, the crank 23 and the rear connecting rod 24, and the rear connecting rod 24 and the rear locking pin 25 are respectively hinged through hinge axes and rotate around the hinge axes;

[0013] The retaining ring 16 is fixedly mounted on the front lock pin 19 on one side close to the front lock pin support 15, the limiting support 18 is mounted on the outside of the front lock pin 19 through its support hole, and is fixedly mounted on the inner side of the outer skin of the hatch 2 through its base, the compression spring 17 is mounted on the front lock pin 19 and is located between the retaining ring 16 and the limiting support 18, and is used to provide a clamping force to the front lock pin 19 and the rear lock pin 25, so as to push the front lock pin 19 into the front lock seat 14, and push the rear lock pin 25 into the rear lock seat 27, so as to achieve a locked state when the hatch 2 is closed.

[0014] Optionally, in the above-mentioned opening device for the lower parachute compartment drag parachute door, the door bolt mechanism 4 further comprises: an upper crank support 21 and a lower crank support 22;

[0015] The crank 23 includes: a crank part and a shaft part vertically passing through the center of the crank part, one end of the shaft part is a cylindrical pin, which is used to be inserted into the center hole of the crank upper support 21, and the hexagonal head at the other end of the shaft part passes through the through hole of the crank lower support 22 and is flush with the outer skin of the cabin door 2. The cabin door 2 can be manually opened or closed by screwing the hexagonal head of the shaft part with a tool.

[0016] Optionally, in the opening device of the lower parachute compartment drag parachute door as described above, the driving mechanism 3 includes: a bracket 10, a rocker arm 11, a round head bolt 13, a push rod 12, a stopper 8 arranged in an L-shaped structure, a push rod 9, a torsion spring 7, and an explosive actuator 6;

[0017] The bracket 10 includes a mounting seat for mounting on the front wall of the drag parachute placement slot 1, and a support plate vertically arranged on the mounting seat, and the end of the support plate is fixedly mounted on the explosive actuator 6;

[0018] One end of the rocker arm 11 and the corner position of the stopper 8 are respectively hinged on the support plate of the bracket 10 through a flat shaft, and the other end of the rocker arm 11 is hingedly installed with a push rod 12 facing the end face of the front lock pin 19 in the door bolt mechanism 4 through a flat shaft, and a clamping plate is provided at the end of the rocker arm 11 facing the explosive actuator 6, and a round head bolt 13 for directly bearing the impact load is installed on the outer side of the clamping plate, and the piston rod 28 of the explosive actuator 6 is opposite to the end face of the round head bolt 13, and one end of the push rod 9 is hinged on one end of the stopper 8 through a flat shaft, and the flat end of the other end of the push rod 9 passes through the bracket 10, and the other end of the stopper 8 is provided with an L-shaped buckle structure that cooperates with the clamping plate, and the torsion spring 7 is installed on the flat shaft of the stopper 8 rotating around the support plate;

[0019] The driving mechanism 3 is used to form an impact force acting on the piston rod 28 in the explosive actuator 6 by connecting the electric combustion explosion tube in the explosive actuator 6 to generate gas pressure when the electric combustion explosion tube in the explosive actuator 6 is turned on, and the impact is applied to the round head bolt 13 installed on the rocker arm 11, so that the rocker arm 11 rotates under the action of the impact force and drives the push rod 12 to move, pushing the front locking pin 19 to overcome the compression force of the compression spring 17 and then move toward the inside of the cabin door 2 to open the cabin door 2, and the buckle structure on the stopper 8 is clamped on the clamping plate of the rocker arm 11 to maintain the open position of the cabin door 2; it is also used to return the rocker arm 11 and the push rod 12 connected to the rocker arm 11 to the position before the impact before closing the drag parachute cabin door.

[0020] Optionally, in the opening device of the drag parachute door of the lower parachute compartment as described above, the opening device specifically comprises: two doors 2 installed on the left and right sides along the heading, the opening position of the drag parachute placement slot 1 is closed by the two doors 2, and when the doors are closed, the right door is supported on the inner side of the left door by a straight profile, and the straight profile is riveted together with the inner and outer skins of the door along the edge of the right door;

[0021] The bolt mechanism 4 is installed in the left door 2 along the heading direction. After the left door is opened by the driving mechanism 3 and the bolt mechanism 4, the right door is opened by gravity.

[0022] Optionally, the opening device of the lower parachute compartment drag parachute door as described above further includes: a supporting mechanism 5;

[0023] One end of the support mechanism 5 is mounted on the rear wall plate of the drag parachute placement slot 1, and the other end is mounted on the cabin door 2, and each cabin door is respectively equipped with a set of support mechanism 5.

[0024] Optionally, in the opening device of the lower parachute compartment drag parachute door as described above, each set of supporting mechanism 5 includes: a support 33, a retractable pull rod 29, a compression spring 30, a triangular rocker arm 31, and a connecting rod 32;

[0025] Among them, one end of the retractable rod 29 and the first end of the triangular rocker arm 31 are respectively installed on the rear wall plate of the drag parachute placement slot 1 through a hinged support 33, the other end of the retractable rod 29 is hinged to the second end of the triangular rocker arm 31, the third end of the triangular rocker arm 31 is hinged to one end of the connecting rod 32, and the other end of the connecting rod 32 is installed on the inner wall of the cabin door 2 through a hinged support 33; and a compression spring 30 is connected between the two ends of the retractable rod 29;

[0026] Each set of supporting mechanisms 5 is used to support the cabin door 2 in an open position when the cabin door 2 installed thereon is lowered, through a supporting structure formed by a retractable pull rod 29, a triangular rocker arm 31, a connecting rod 32 and a support 33, so as to prevent the cabin door from being damaged due to swinging left or right.

[0027] Optionally, in the opening device of the lower parachute compartment drag parachute door as described above, the retractable pull rod 29 comprises: a sleeve 35, a core rod 36, a first pull rod joint 34 and a second pull rod joint 37;

[0028] One end of the sleeve 35 is embedded and sleeved in the first tie rod joint 34 , and the other end of the sleeve is sleeved outside one end of the core rod 36 , and the other end of the core rod 36 is embedded and sleeved in the second tie rod joint 37 .

[0029] An embodiment of the present invention further provides a method for using a device for opening a drag parachute door of a lower parachute compartment. The method for using the device for opening a drag parachute door of a lower parachute compartment as described in any one of the above items to open or close the drag parachute door comprises:

[0030] During the flight of the aircraft, the front lock pin 19 and the rear lock pin 25 are correspondingly inserted into the front lock seat 14 and the rear lock seat 27 under the spring force of the compression spring 17, so that the cabin door can be reliably closed;

[0031] When the aircraft lands and releases the parachute, after the pilot presses the parachute release button, the electric combustion explosion tube in the explosion actuator 6 in the driving mechanism 3 is energized and explodes to generate gas pressure, which is converted into impact force through the piston rod 28 in the explosion actuator 6, and impacts the round head bolt 13 installed on the rocker arm 11. The rocker arm 11 rotates under the impact force and drives the push rod 12 to move forward, pushing the front lock pin 19, driving the bolt mechanism 4 to open the drag parachute door, and the stopper 8 rotates and clamps the rocker arm 11 under the action of the torsion spring 7 to prevent the rocker arm 11 from returning to the position before the impact;

[0032] During the hatch door opening process, the push rod 12 on the drive mechanism 3 impacts the front end of the front lock pin 19, and the front lock pin 19 moves backward, and the front end of the front lock pin 19 is disengaged from the front lock seat 14 and retracted into the hatch door 2. At the same time, the crank 23 is driven by the front connecting rod 20 to rotate around the crank upper support 21 and the crank lower support 22, so that the rear lock pin 25 is driven by the rear connecting rod 24 to move forward, disengage from the rear lock seat 27 and retract into the hatch door, and the bolt mechanism 4 is opened together with the hatch door 2 around the hinge on the drag parachute placement slot 1;

[0033] When the door 2 is opened, the triangular rocker arm 31 rotates under the spring force of the compression spring 30, so that the connecting rod 32 is in the lowered state together with the door 2, and the drag parachute door is "locked" in the open position;

[0034] Before closing the drag parachute door, the rocker arm 11 and the push rod 12 connected to the rocker arm 11 are returned to the position before the impact by pressing the top rod 9 hinged on the stopper 8;

[0035] When closing the drag parachute door, the connecting rod 32 is manually pushed so that it passes the "dead point" and then pushes the triangular rocker arm 31 to rotate to compress the spring 30. A universal socket wrench 38 is used to clamp the hexagonal head on the crank 23 axis and rotate the socket wrench handle so that the front and rear locking pins are retracted into the door under the drive of the connecting rod to close the drag parachute door.

[0036] Beneficial effects of the invention: The embodiment of the invention provides an opening device and a method for using a lower parachute compartment drag parachute door, which has the following beneficial effects:

[0037] 1) The drag parachute door opening device has a simple structure, reliable operation, stable performance, convenient installation and maintenance, mature materials and manufacturing processes, and good interchangeability; 2) The door bolt mechanism is installed inside the door on the left side of the drag parachute placement slot, and does not occupy the internal space of the drag parachute placement slot; 3) The driving mechanism prevents the rocker arm from returning to the position before the impact through the stopper, ensuring that the drag parachute door can be reliably opened when the aircraft lands and releases the parachute; 4) A compression spring is installed on the door bolt mechanism lock pin, which has the functions of locking, buffering and limiting. The lock pin is inserted into the lock seat under the spring force of the compression spring to achieve reliable closing of the door; for the explosive impact force generated by the electric combustion explosive tube, the compression spring plays a buffering role to prevent the door and the door bolt mechanism from being damaged by impact; the compression spring is embedded between the retaining ring and the limiting support to play a limiting role to prevent the lock pin from falling out of the support; 5) When the drag parachute door is lowered, the support mechanism supports the door in the open position to prevent the door from being damaged due to left and right swinging; 6) No special tools are required, and the door can be closed and opened using a universal socket wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0039] Figure 1 It is a schematic diagram of the composition and assembly structure of the drag parachute door opening device;

[0040] Figure 2 It is a schematic diagram of the driving mechanism and the door bolt mechanism when the door is closed and opened; Figure 2 Figure a shows the hatch door closed, and figure b shows the hatch door open;

[0041] Figure 3 It is a schematic diagram of the support mechanism when the hatch is closed and opened; Figure 2 Figure a shows the hatch door closed, and figure b shows the hatch door open;

[0042] Figure 4 It is a schematic diagram of the crank structure;

[0043] Figure 5It is a schematic diagram of the retractable pull rod structure;

[0044] Figure 6 It is a schematic diagram of the state of the crank during the closing process of the hatch;

[0045] Figure 7 This is a diagram showing the door in closed state.

[0046] Description of the markings in the figure:

[0047] 1. Drag parachute placement slot, 2. Hatch door, 3. Drive mechanism, 4. Door bolt mechanism, 5. Support mechanism, 6. Explosive actuator, 7. Torsion spring, 8. Stopper, 9. Push rod, 10. Bracket, 11. Rocker arm, 12. Push rod, 13. Round head bolt, 14. Front lock seat, 15. Front lock pin support, 16. Retaining ring, 17. Compression spring, 18. Limit support, 19. Front lock pin, 20. Connector rod, 21. crank upper support, 22. crank lower support, 23. crank, 24. connecting rod, 25. rear locking pin, 26. rear locking pin support, 27. rear locking seat, 28. piston rod, 29. telescopic pull rod, 30. compression spring, 31. triangular rocker arm, 32. connecting rod, 33. support, 34. pull rod joint, 35. sleeve, 36. core rod, 37. pull rod joint, 38. sleeve wrench. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0049] As described in the above background technology, the existing drag parachute door opening devices are mostly hydraulic, pneumatic and other forms, and have the problems of complex structure, large occupied space, low reliability and the like.

[0050] Low reliability may lead to the accidental opening of the door and the failure to open the parachute, which may affect the completion of the flight mission. In serious cases, it may also cause the accident of running off the runway, causing damage to personnel and equipment. Therefore, it is necessary to design a lower parachute cabin drag parachute door opening device with simple structure, reliable operation, stable performance and convenient maintenance, which can meet the requirements of high-intensity and high-difficulty flight missions at this stage.

[0051] In response to the above-mentioned problems and design requirements, an embodiment of the present invention provides an opening device and a method for using a lower parachute compartment drag parachute door. The opening device for the lower parachute compartment drag parachute door can meet the requirement of reliably closing the drag parachute door during flight to avoid accidental parachute release, and can also meet the requirement of quickly opening the drag parachute door when releasing the parachute.

[0052] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0053] Figure 1 The present invention provides a schematic diagram of the composition and assembly structure of an opening device for a lower parachute compartment drag parachute door. Figure 1 As shown, the component structure of the opening device of the lower parachute compartment drag parachute door provided by the embodiment of the present invention includes: a door 2, a driving mechanism 3, a door bolt mechanism 4, and a supporting mechanism 5.

[0054] The cabin door 2 is installed at the lower part of the drag parachute placement slot 1 through hinges (the cabin door 2 is overlapped left and right along the heading, and after the left cabin door 2 falls, the right cabin door will fall accordingly), the driving mechanism 3 is installed on the front wall panel of the drag parachute placement slot 1 through the bracket 10, the door bolt mechanism 4 is installed inside the left cabin door 2 of the drag parachute placement slot 1, one end of the supporting mechanism 5 is connected to the rear wall panel of the drag parachute placement slot 1, and the other end is connected to the rear of the cabin door.

[0055] Two doors 2 are installed at the opening of the drag parachute placement slot 1 through hinges. The opening of the drag parachute placement slot 1 is closed by two doors 2. When closed, the right door is supported on the left door by a straight profile. The straight profile is riveted along the edge of the right door with the inner and outer skins of the door. Each door consists of an inner box-shaped part, a partition and an outer skin. The inner box-shaped part is pressed from an aluminum alloy plate. A plate-bent partition is arranged between the inner box-shaped part and the outer skin for reinforcement.

[0056] The driving mechanism 3 is mounted on the front wall of the drag parachute placement slot 1 through the bracket 10. Figure 2 As shown, the driving mechanism 3 is mainly composed of a bracket 10, a rocker arm 11, a round head bolt 13, a push rod 12, a stopper 8, a push rod 9, a torsion spring 7, an explosive actuator 6, etc. The driving mechanism provides power for the operation of the bolt mechanism 4. The rocker arm 11 and the stopper 8 are installed on the bracket 10 through a flat head shaft, the push rod 9 is installed on one end of the stopper 8 through a flat head shaft, and the push rod 12 is installed on the rocker arm 11 through a flat head shaft. The rocker arm 11, the stopper 8, the push rod 9, and the push rod 12 can all rotate around the flat head shaft. The rocker arm 11 is equipped with a round head bolt 13 that directly bears the impact load, and the torsion spring 7 is installed on the shaft of the stopper 8 rotating around the bracket 10.

[0057] The door bolt mechanism 4 is installed inside the left hatch 2 of the drag parachute placement slot 1. Figure 2As shown, the bolt mechanism 4 is mainly composed of a front lock seat 14, a front lock pin support 15, a front lock pin 19, a retaining ring 16, a compression spring 17, a limit support 18, a front connecting rod 20, a crank 23, an upper crank support 21, a lower crank support 22, a rear connecting rod 24, a rear lock pin 25, a rear lock pin support 26, and a rear lock seat 27. The bolt mechanism 4 is used for opening and closing the cabin door. The front lock seat 14 and the rear lock seat 27 are respectively fixed to the inner side of the front and rear wall plates of the drag parachute placement slot 1, the front lock pin support 15 and the rear lock pin support 26 are respectively fixed to the front and rear ends of the inner box-shaped member in the left cabin door, and the front lock pin 19 and the rear lock pin 25 can move along the course in the through holes of the front lock pin support 15 and the rear lock pin support 26. The front locking pin 19 and the front connecting rod 20, the front connecting rod 20 and the crank 23, the crank 23 and the rear connecting rod 24, and the rear connecting rod 24 and the rear locking pin 25 are respectively hinged through hinge shafts and can rotate around the hinge shafts. Figure 4 The front and rear lock pins are inserted into the front and rear lock seats under the spring force of the compression spring 17 to achieve reliable closing of the hatch door. Marking lines are drawn on the left hatch door outer skin and the hexagonal head of the crank 23 axis, as shown in the figure. Figure 7 As shown, its function is to check whether the hatch is securely closed by observing the relative position of the marking line on the hexagonal head and the marking line on the skin.

[0058] One end of the support mechanism 5 is mounted on the rear wall of the placement slot 1, and the other end is mounted on the hatch 2. A set of support mechanisms 5 is mounted on each of the two hatches. Figure 3 As shown, the support mechanism mainly consists of a support 33, a retractable pull rod 29 (such as Figure 5 As shown, it is composed of a sleeve 35, a core rod 36, tie rod joints 34 and 37, etc.), a compression spring 30, a triangular rocker arm 31, a connecting rod 32, etc. Its function is to support the door in the open position when the drag parachute door is lowered to prevent the door from being damaged due to left or right swinging.

[0059] Based on the opening device of the lower parachute compartment drag parachute door provided by the above embodiment of the present invention, the embodiment of the present invention also provides a method for using the opening device of the lower parachute compartment drag parachute door, comprising the following steps:

[0060] During the flight of the aircraft, the front lock pin 19 and the rear lock pin 25 are correspondingly inserted into the front lock seat 14 and the rear lock seat 27 under the spring force of the compression spring 17, so as to realize the reliable closing of the cabin door. When the aircraft lands and releases the parachute, the pilot presses the release button, and the electric combustion explosion tube in the explosion actuator 6 is energized and exploded to generate gas pressure, which is converted into impact force through the piston rod 28 in the explosion actuator 6, and impacts the round head bolt 13 installed on the rocker arm 11. The rocker arm 11 rotates under the impact force, driving the push rod 12 to move forward, pushing the front lock pin 19, driving the bolt mechanism 4 to open the drag parachute cabin door, and the stopper 8 rotates and clamps the rocker arm 11 under the action of the torsion spring 7 to prevent the rocker arm 11 from returning to the position before the impact.

[0061] When the hatch is opened, the push rod 12 on the driving mechanism 3 impacts the front end of the front lock pin 19, and the front lock pin 19 moves backward, and the front end of the front lock pin 19 is disengaged from the front lock seat 14 and retracted into the hatch 2. At the same time, the crank 23 is driven by the front connecting rod 20 to rotate around the crank upper support 21 and the crank lower support 22, so that the rear lock pin 25 is driven by the rear connecting rod 24 to move forward, disengage from the rear lock seat 27 and retract into the hatch, and the bolt mechanism 4 opens together with the hatch 2 around the hinge on the drag parachute placement slot 1. When the hatch 2 is opened, under the spring force of the compression spring 30, the triangular rocker arm 31 rotates, so that the connecting rod 32 is in the lowered state together with the hatch 2, and the drag parachute hatch is "locked" in the open position.

[0062] Before closing the drag parachute door, press the top rod 9 hinged on the stopper 8 to return the rocker arm 11 and the push rod 12 connected to the rocker arm 11 to the position before the impact. When closing the drag parachute door, you need to gently push the connecting rod 32 by hand to make it pass the "dead point", push the triangular rocker arm 31 to rotate, compress the spring 30, and at the same time use a universal socket wrench 38 to clamp the hexagonal head on the crank 23 shaft and rotate the socket wrench handle, such as Figure 6 As shown, the front and rear locking pins are retracted into the cabin door under the drive of the connecting rod, the drag parachute cabin door is closed, and the socket wrench is loosened so that the front and rear locking pins are inserted into the front and rear lock seats under the spring force of the compression spring 17, thereby achieving reliable closure of the cabin door.

[0063] The embodiment of the present invention provides an opening device and a method for using a lower parachute compartment drag parachute door, which has the following beneficial effects:

[0064] 1) The drag parachute door opening device has a simple structure, reliable operation, stable performance, convenient installation and maintenance, mature materials and manufacturing processes, and good interchangeability; 2) The door bolt mechanism is installed inside the door on the left side of the drag parachute placement slot, and does not occupy the internal space of the drag parachute placement slot; 3) The driving mechanism prevents the rocker arm from returning to the position before the impact through the stopper, ensuring that the drag parachute door can be reliably opened when the aircraft lands and releases the parachute; 4) A compression spring is installed on the door bolt mechanism lock pin, which has the functions of locking, buffering and limiting. The lock pin is inserted into the lock seat under the spring force of the compression spring to achieve reliable closing of the door; for the explosive impact force generated by the electric combustion explosive tube, the compression spring plays a buffering role to prevent the door and the door bolt mechanism from being damaged by impact; the compression spring is embedded between the retaining ring and the limiting support to play a limiting role to prevent the lock pin from falling out of the support; 5) When the drag parachute door is lowered, the support mechanism supports the door in the open position to prevent the door from being damaged due to left and right swinging; 6) No special tools are required, and the door can be closed and opened using a universal socket wrench.

[0065] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. An opening device for a lower parachute compartment drag parachute door, characterized in that: A drag parachute placement slot (1) embedded in the aircraft body is provided at the opening position of the aircraft door for placing the drag parachute; the opening device of the drag parachute door of the lower parachute cabin comprises: a cabin door (2), a driving mechanism (3), and a door bolt mechanism (4); The hatch (2) is installed at the opening position of the drag parachute placement slot (1) and is used to close the opening position of the drag parachute placement slot (1); the driving mechanism (3) is installed on the front wall plate of the drag parachute placement slot (1) through its internal bracket (10); the bolt mechanism (4) is installed inside the hatch (2) along the heading, and one end of the bolt mechanism (4) is associated with the driving mechanism (3) so that the door can be opened and closed by controlling the bolt mechanism (4) through the driving mechanism (3); The door bolt mechanism (4) comprises: a front lock seat (14) and a rear lock seat (27) respectively mounted on the inner sides of the front and rear wall plates of the drag parachute placement slot (1); a lock pin assembly passing through the cabin door (2) along the course; a front lock pin (19) in the lock pin assembly passes through the front side plate of the box-shaped member inside the cabin door (2) and then is inserted into the front lock seat (14); a rear lock pin (25) in the lock pin assembly passes through the rear side plate of the box-shaped member inside the cabin door (2) and then is inserted into the rear lock seat (27); the front lock pin (19) and the rear lock pin (25) are respectively connected by a hinge The connecting rod is hinged with the intermediate crank (23), and the front lock pin (19) is sleeved with a compression spring (17), one end of the compression spring (17) is fixedly connected to the specified axial position of the front lock pin (19), and the other end is fixed to the specified position of the cabin door (2) through a support. The compression spring (17) provides a pressing force to the front lock pin (19) and the rear lock pin (25), so as to push the front lock pin (19) into the front lock seat (14) and push the rear lock pin (25) into the rear lock seat (27), so as to realize the locked state when the cabin door (2) is closed.

2. The opening device for the lower parachute compartment drag parachute door according to claim 1, characterized in that: The hatch (2) is installed at the opening position of the drag parachute placement slot (1) through hinges, and the hatch comprises an inner box-shaped part, an outer skin, and a partition arranged between the inner box-shaped part and the outer skin, wherein the inner box-shaped part is formed by pressing an aluminum alloy plate; the plate-bent partition arranged between the inner box-shaped part and the outer skin plays a reinforcing role.

3. The opening device for the lower parachute compartment drag parachute door according to claim 2, characterized in that: The door bolt mechanism (4) comprises: a front lock seat (14), a front lock pin support (15), a retaining ring (16), a compression spring (17), a limit support (18), a front lock pin (19), a front connecting rod 20, a crank (23), a rear connecting rod (24), a rear lock pin (25), a rear lock pin support (26), and a rear lock seat (27) which are arranged in sequence from front to rear along the heading direction; The front lock seat (14) and the rear lock seat (27) are respectively fixedly mounted on the front and rear inner wall plates of the drag parachute placement slot (1); the front lock pin support (15) and the rear lock pin support (26) are respectively fixedly mounted on the front and rear ends of the inner box-shaped member in the cabin door (2); the front end of the front lock pin (19) passes through the through hole of the front lock pin support (15) and moves along the course in the through holes of the front lock pin support (15) and the front lock seat (14); the rear lock seat (27) passes through the through hole of the rear lock pin support (26) and moves along the course in the through holes of the rear lock pin support (26) and the rear lock seat (27); The front locking pin (19) and the front connecting rod 20, the front connecting rod 20 and the crank (23), the crank (23) and the rear connecting rod (24), and the rear connecting rod (24) and the rear locking pin (25) are respectively hinged via hinge shafts and rotate around the hinge shafts; The retaining ring (16) is fixedly sleeved on the front lock pin (19) near the side of the front lock pin support (15); the limiting support (18) is sleeved on the outside of the front lock pin (19) through its support hole and fixedly installed on the inner side of the outer skin of the hatch door (2) through its base; the compression spring (17) is sleeved on the front lock pin (19) and is located between the retaining ring (16) and the limiting support (18) for providing a pressing force to the front lock pin (19) and the rear lock pin (25) so as to push the front lock pin (19) into the front lock seat (14) and push the rear lock pin (25) into the rear lock seat (27) to achieve a locked state when the hatch door (2) is closed.

4. The opening device for the lower parachute compartment drag parachute door according to claim 3, characterized in that: The door bolt mechanism (4) further comprises: an upper crank support (21) and a lower crank support (22); The crank (23) comprises: a crank portion and a shaft portion vertically passing through the center of the crank portion, one end of the shaft portion is a cylindrical pin for inserting into the center hole of the crank upper support (21), and the hexagonal head at the other end of the shaft portion passes through the through hole of the crank lower support (22) and is flush with the outer skin of the hatch (2). The hatch (2) can be manually opened or closed by screwing the hexagonal head of the shaft portion with a tool.

5. The opening device for the lower parachute compartment drag parachute door according to claim 3, characterized in that: The driving mechanism (3) comprises: a bracket (10), a rocker arm (11), a round head bolt (13), a push rod (12), a stopper (8) arranged in an L-shaped structure, a push rod (9), a torsion spring (7), and an explosive actuator (6); The bracket (10) comprises a mounting seat for mounting on the front wall plate of the drag parachute placement slot (1), and a support plate vertically arranged on the mounting seat, and the end of the support plate is fixedly mounted on the explosive actuator (6); One end of the rocker arm (11) and the corner position of the stopper (8) are respectively hinged on the support plate of the bracket (10) through a flat shaft, and the other end of the rocker arm (11) is hingedly installed with a push rod (12) facing the end face of the front lock pin (19) in the door bolt mechanism (4) through the flat shaft, and a clamping plate is provided at one end of the rocker arm (11) facing the explosive actuator (6), and a round head bolt (13) for directly bearing the impact load is installed on the outer side of the clamping plate, and the piston rod (28) of the explosive actuator (6) is opposite to the end face of the round head bolt (13), one end of the push rod (9) is hinged on one end of the stopper (8) through the flat shaft, and the flat end of the other end of the push rod (9) passes through the bracket (10), and the other end of the stopper (8) is provided with an L-shaped buckle structure that cooperates with the clamping plate, and the torsion spring (7) is installed on the flat shaft of the stopper (8) rotating around the support plate; The driving mechanism (3) is used to generate gas pressure by connecting the electric combustion explosion tube in the explosive actuator (6) to generate an impact force acting on the piston rod (28) in the explosive actuator (6) when the parachute is released during landing, and to impact the round head bolt (13) installed on the rocker arm (11), so that the rocker arm (11) rotates under the impact force and drives the push rod (12) to move, pushing the front lock pin (19) to overcome the compression force of the compression spring (17) and move toward the inside of the cabin door (2), thereby opening the cabin door (2), and the buckle structure on the stopper (8) is clamped on the clamping plate of the rocker arm (11) to maintain the open position of the cabin door (2); it is also used to press the top rod (9) hinged on the stopper (8) before closing the drag parachute cabin door, so that the rocker arm (11) and the push rod (12) connected to the rocker arm (11) return to the position before the impact.

6. The opening device for the lower parachute compartment drag parachute door according to any one of claims 1 to 5, wherein the opening device specifically comprises: Two doors (2) are installed on the left and right sides along the heading, and the opening position of the drag parachute placement slot (1) is closed by the two doors (2). When the doors are closed, the right door is supported on the inner side of the left door by a straight profile, and the straight profile is riveted together with the inner and outer skins of the door along the edge of the right door; The door bolt mechanism (4) is installed in the left door (2) along the heading direction. After the left door is opened by the driving mechanism (3) and the door bolt mechanism (4), the right door is opened by gravity.

7. The opening device for the lower parachute compartment drag parachute door according to claim 6, characterized in that: Also includes: Support mechanism (5); One end of the support mechanism (5) is mounted on the rear wall plate of the drag parachute placement slot (1), and the other end is mounted on the cabin door (2), and each cabin door is respectively mounted with a set of support mechanisms (5).

8. The opening device for the lower parachute compartment drag parachute door according to claim 7, characterized in that: Each set of supporting mechanisms (5) comprises: a support (33), a retractable pull rod (29), a compression spring (30), a triangular rocker arm (31), and a connecting rod (32); Wherein, one end of the retractable rod (29) and the first end of the triangular rocker arm (31) are respectively mounted on the rear wall plate of the drag parachute placement slot (1) through a hinged support (33), the other end of the retractable rod (29) is hinged to the second end of the triangular rocker arm (31), the third end of the triangular rocker arm (31) is hinged to one end of the connecting rod (32), and the other end of the connecting rod (32) is mounted on the inner wall of the cabin door (2) through a hinged support (33); and a compression spring (30) is connected between the two ends of the retractable rod (29); Each set of supporting mechanisms (5) is used to support the cabin door (2) in an open position when the cabin door (2) installed thereon is lowered, through a supporting structure formed by a retractable pull rod (29), a triangular rocker arm (31), a connecting rod (32) and a support (33), so as to prevent the cabin door from being damaged due to left or right swinging.

9. The opening device for the lower parachute compartment drag parachute door according to claim 8, characterized in that: The telescopic pull rod (29) comprises: a sleeve (35), a core rod (36), a first pull rod joint (34) and a second pull rod joint (37); One end of the sleeve (35) is embedded and sleeved in the first pull rod joint (34), the other end of the sleeve is sleeved outside one end of the core rod (36), and the other end of the core rod (36) is embedded and sleeved in the second pull rod joint (37).

10. A method for using a device for opening a lower parachute compartment drag parachute door, characterized in that: A method for opening or closing a drag parachute door using the opening device for the drag parachute door of the lower parachute compartment according to any one of claims 1 to 9 comprises: During the flight of the aircraft, the front lock pin (19) and the rear lock pin (25) are correspondingly inserted into the front lock seat (14) and the rear lock seat (27) under the spring force of the compression spring (17), so that the cabin door can be reliably closed; When the aircraft lands and releases the parachute, after the pilot presses the parachute release button, the electric combustion explosion tube in the explosion actuator (6) in the driving mechanism (3) is energized and explodes to generate gas pressure, which is converted into impact force through the piston rod (28) in the explosion actuator (6), and impacts the round head bolt (13) installed on the rocker arm (11). Under the action of the impact force, the rocker arm (11) rotates and drives the push rod (12) to move forward, pushing the front lock pin (19), driving the door bolt mechanism (4) to open the drag parachute cabin door, and the stopper (8) rotates and clamps the rocker arm (11) under the action of the torsion spring (7), preventing the rocker arm (11) from returning to the position before the impact; During the process of opening the hatch, the push rod (12) on the driving mechanism (3) impacts the front end of the front lock pin (19), and the front lock pin (19) moves backward, and the front end of the front lock pin (19) is disengaged from the front lock seat (14) and retracted into the hatch (2). At the same time, driven by the front connecting rod 20, the crank (23) rotates around the crank upper support (21) and the crank lower support (22), so that the rear lock pin (25) moves forward under the drive of the rear connecting rod (24), disengages from the rear lock seat (27) and retracts into the hatch, and the bolt mechanism (4) opens together with the hatch (2) around the hinge on the drag parachute placement slot (1); When the door (2) is opened, under the action of the spring force of the compression spring (30), the triangular rocker arm (31) rotates, so that the connecting rod (32) is in a lowered state together with the door (2), and the drag parachute door is "locked" in the open position; Before closing the drag parachute door, the rocker arm (11) and the push rod (12) connected to the rocker arm (11) are returned to the position before the impact by pressing the push rod (9) hinged on the stopper (8); When closing the drag parachute door, the connecting rod (32) is manually pushed to pass the "dead point" and then the triangular rocker arm (31) is pushed to rotate to compress the spring (30). A universal socket wrench (38) is used to clamp the hexagonal head on the crank (23) shaft and the socket wrench handle is rotated to retract the front and rear locking pins into the door under the drive of the connecting rod, thereby closing the drag parachute door.

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