Uncontrolled separation device and assembly tooling for drone recovery parachute

Abstract

The present invention discloses an uncontrolled separation device for recovering an unmanned aerial vehicle (UAV) parachute and an assembly tool, and belongs to the technical field of UAV recovery. It includes a first connection part for connecting to a recovery parachute and a second connection part for connecting to an unmanned aerial vehicle; a mechanical separation mechanism is connected between the first connection part and the second connection part; when the pulling force of the UAV disappears, the mechanical separation mechanism drives the first connection part to separate from the second connection part. The first connection part and the second connection part are separated in time by the mechanical separation mechanism after the pulling force of the uncontrolled separation device for recovering an unmanned aerial vehicle (UAV) parachute disappears. Since a pure mechanical structure is adopted without circuits and electromagnetic components, the reliability of separation is guaranteed; the design of the pure mechanical structure guarantees the anti-collision performance.

Description

Technical Field

[0001] The invention relates to a separation device, in particular to an uncontrolled separation device for a recovery parachute of a drone and an assembly tool, belonging to the technical field of drone recovery. Background Art

[0002] The main function of the recovery parachute separation device is to connect the recovery parachute and the aircraft. After the aircraft lands on the ground, the separation device is activated, and the recovery parachute is separated from the aircraft, thereby preventing the recovery parachute from dragging the aircraft and causing damage. At present, the existing recovery parachute separation devices are mainly divided into two categories based on the control method: controlled and uncontrolled. The controlled recovery parachute separation device generally uses pyrotechnics or electromagnetics as the driving component. After landing, the sensor determines the aircraft's ground contact. The flight control computer gives a separation command, and the power is turned on to trigger the separation device to actuate and then separate the aircraft and the parachute. The uncontrolled recovery parachute separation device generally uses the parachute opening action as the driving force and logic, and uses springs for mechanical energy storage. During the landing process, the separation device is tensioned under the combined action of the aircraft's gravity and the recovery parachute's resistance. After the aircraft touches the ground, the force balance is broken. Under the combined action of the elastic force of the separation spring and the recovery parachute's resistance, the separation device is actuated to ensure the separation of the aircraft and the parachute.

[0003] Existing controlled separation devices generally have problems such as impact resistance and false triggering due to static electricity. When the drone recovers the parachute, the separation device connector may hit the exposed wing surface and other structures of the drone. In some cases, the impact will cause the pyrotechnics or electromagnetic components to fail under the impact load; in some cases, the impact will also cause the cotter pin at one end of the separation device connector connected to the parachute pin to be sheared off. In addition, the drone will continue to accumulate static electricity during flight. If the relevant parts or wiring of the separation device connector are not properly handled, it will cause static electricity to be released, and then falsely trigger the pyrotechnics or electromagnetic components. In some cases, if the flight control program issues an erroneous command or the circuit is erroneously turned on, it will also cause the separation device to be falsely triggered.

[0004] The existing uncontrolled separation devices have the problem of not being able to withstand impact. When the drone recovers the parachute, the separation device joints may hit the exposed wing surface and other structures of the drone. In some cases, the impact may cause the uncontrolled mechanical separation device joints to actuate prematurely and then separate the drone and the parachute. In addition, during the parachute opening process, when the parachute ropes are all tensioned and straightened, the upper and lower joints or rolling parts of the main load-bearing device of the separation device may have internal impact problems, which may also cause harmful plastic deformation and affect separation or reuse. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a controlless separation device and assembly tooling for a UAV recovery parachute with a purely mechanical structure, good impact resistance and reliability.

[0006] In order to solve the above technical problems, the uncontrolled separation device for recovering a parachute of a drone provided by the present invention comprises a first connection part for connecting with the recovery parachute and a second connection part for connecting with the drone;

[0007] A mechanical separation mechanism is connected between the first connection portion and the second connection portion;

[0008] When the pulling force of the drone disappears, the mechanical separation mechanism drives the first connection part to separate from the second connection part.

[0009] In the present invention, the mechanical separation mechanism comprises a pull rod, a shearing member, a piston, a ball, an inner compression spring and an outer compression spring;

[0010] The pull rod is arranged in the inner cavity of the second connecting part;

[0011] The upper part of the second connecting part is provided with a plurality of circular holes along the circumferential direction, and balls are arranged in each of the circular holes;

[0012] The lower part of the second connecting part is provided with a round table adapted to the external compression spring, and the external compression spring is sleeved on the second connecting part;

[0013] The inner pressure spring is sleeved on the pull rod, the upper part of the pull rod is connected to the piston, the inner pressure spring and the piston are both located in the inner cavity, and the piston can slide along the inner cavity;

[0014] The piston is provided with a cavity for accommodating the ball; when the cavity and the circular hole are positioned opposite to each other, the ball slides into the cavity;

[0015] After the assembly is completed, the shearing component can pass through the tie rod and the second connecting part, and the three are connected;

[0016] After the assembly is completed, the ball is located in the first connecting portion and is tightly attached to the lower edge of the first connecting portion.

[0017] In the present invention, the shear component includes a tie rod crossbeam and a shear pin. The tie rod crossbeam is provided with a first latch hole for the shear pin to pass through, and the first latch hole is an eccentric hole; the shear pin can pass through the second connecting part and the tie rod crossbeam to connect the two; the tie rod crossbeam is locked or separated with the tie rod by rotation.

[0018] In the present invention, the second connecting portion is provided with a second pin hole for the shear pin to pass through, and the second pin hole extends outwardly with a waist-shaped groove, and the depth of the waist-shaped groove is slightly greater than the diameter of the shear pin.

[0019] In the present invention, the length of the tie rod cross beam is the same as the transverse length of the tie rod, and the length is the same as the width of the groove in the lower part of the second connecting part where the tie rod is placed, with a clearance for matching.

[0020] In the present invention, the first connecting portion comprises an upper joint and an upper umbrella pin, the upper joint is provided with an umbrella pin hole for inserting the upper umbrella pin, and the upper umbrella pin is clearance-matched with the umbrella pin hole.

[0021] In the present invention, one end of the upper umbrella pin is a large head and the other end is a small head, a notch is provided at the large head end, and a key tongue is provided at the small head end;

[0022] A stop screw groove platform is provided next to the umbrella pin hole on one side of the upper joint, and a horseshoe-shaped groove platform is provided next to the umbrella pin hole on the other side;

[0023] The umbrella pin hole is provided with a keyhole groove matching with the upper umbrella pin key tongue;

[0024] After the upper umbrella pin passes through the upper joint and rotates, the key tongue at the small head end hooks the horseshoe-shaped groove platform, the notch at the large head end is opposite to the notch of the stop screw, and the stop screw is screwed in.

[0025] In the present invention, the second connecting portion comprises a lower joint and a lower umbrella pin, the lower joint is provided with an umbrella pin hole for inserting the lower umbrella pin, and the lower umbrella pin is clearance-matched with the umbrella pin hole.

[0026] In the present invention, notches are respectively provided at both ends of the lower umbrella pin, and a stop screw groove platform is provided beside the umbrella pin hole;

[0027] After the lower umbrella pin is inserted into the umbrella pin hole, the stop screws are screwed into the stop screw groove platforms respectively.

[0028] The present invention also provides an assembly tool for an uncontrolled separation device of a recovery parachute of a drone, comprising a clamping claw, a first clamping screw and a second clamping screw;

[0029] The clamping claw is a U-shaped structure, and the open end is provided with a hook portion capable of hooking the second connecting portion;

[0030] The first clamping screw and the second clamping screw are arranged at the closed end of the jaw;

[0031] There are two first clamping screws, which are respectively located on both sides of the second clamping screw;

[0032] During assembly, the second clamping screw faces the mechanical separation mechanism, and the first clamping screw faces the first connecting portion.

[0033] The beneficial effects of the present invention are: (1) the first connection part and the second connection part are separated in time through the mechanical separation mechanism after the pulling force of the drone on the uncontrolled separation device of the drone recovery parachute of the present invention disappears. Since a pure mechanical structure is adopted without circuits and electromagnetic components, the reliability of separation is guaranteed; the design of the pure mechanical structure ensures the anti-impact performance; (2) after assembly, through the cooperation between the piston, the ball, the internal compression spring and the external compression spring, the ball only has rolling motion. Under the cooperation of the elastic force and structural dimensions of the external compression spring, the ball has no internal impact movement, the ball is always in close contact with the lower edge of the first connection, and there is only a small gap between the upper part of the second connection part and the upper wall of the inner cavity of the first connection part, thereby avoiding structural damage or plastic deformation caused by internal impact. This ensures that even when an external impact occurs, the steel ball will not move in the axial direction of the separation device; (3) The pull rod and the pull rod cross beam are placed in the second connection part. During the parachute opening process, if the separation device collides with the drone, the shear pin can be effectively protected from being damaged; after the shear pin is inserted, the pull rod cross beam cannot rotate around the pin hole due to the eccentric hole, thereby improving its reliability; (4) The pin hole extends to one side with a waist-shaped groove that can accommodate the bent parts of the two ends of the inserted shear pin, thereby ensuring that the shear pin does not protrude from the outer surface of the second connection part; (5) The pull rod cross beam, the pull rod and the first The clearance between the two connecting parts ensures the stability and reliability of the connection structure; (6) The upper umbrella pin and the upper joint adopt the key tongue and keyhole groove to cooperate with each other, which can be used for the quick disassembly and assembly of the upper umbrella pin, and ensure that the upper umbrella pin and its stopping structure do not protrude from the surface of the upper joint, thereby improving safety; (7) The cooperation of the stopping screw, the notch of the lower umbrella pin and the lower umbrella pin hole ensures that the stopping screw and the lower umbrella pin do not protrude from the outer surface of the lower joint, and ensures that the lower umbrella pin is stably fixed on the lower joint; (8) The device has a simple structure, high reliability, quick and easy installation and disassembly, can be reused, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 Schematic diagram of the uncontrolled separation device for the recovery parachute of a UAV, (a) is a cross-sectional view Figure 1 , (b) is a cross-sectional view Figure 2 ;

[0036] Figure 2 Assembly tooling and assembly schematic diagram, (a) is the main view, (b) is a partial state diagram, (c) is a cross-sectional view of (a);

[0037] Figure 3 is the assembly process state diagram;

[0038] Figure 4 The assembly is completed, (a) is the main view, (b) is the cross-sectional view;

[0039] Figure 5 Schematic diagram of the connection of the sling ring under the recovery parachute, (a) is the main view, (b) is the cross-sectional view;

[0040] Figure 6 Schematic diagram of the upper and lower joints, umbrella pin holes and umbrella pin matching, (a) is the front view, (b) is the side view, and (c) is the rear view;

[0041] Figure 7 Schematic diagram of the structure and coordination of the tie rod cross beam and the tie rod, (a) is the structural diagram, (b) is the locked state diagram, and (c) is the unlocked state diagram;

[0042] Figure 8 Schematic diagram of the lower umbrella pin structure, (a) is the main view, (b) is the side view, and (c) is the top view;

[0043] Fig. 9 Schematic diagram of the upper umbrella pin structure, (a) is the main view, (b) is the side view, and (c) is the top view;

[0044] Fig.10 Schematic diagram of the upper and lower joints, the umbrella pin holes and the umbrella pin after being fixed, (a) is the front view, (b) is the side view, and (c) is the rear view;

[0045] Fig.11 for Fig.10 The cross-sectional view of Figure 1 , (b) is a cross-sectional view Figure 2 ;

[0046] Fig.12 This is a diagram of the locking state of the uncontrolled separation device of the UAV recovery parachute, (a) is a cross-sectional view Figure 1 , (b) is a cross-sectional view Figure 2 ;

[0047] Fig.13 (a) is the state diagram of the lower sling tension disappearing, and (b) is the cross-sectional view. Figure 1 , (b) is a cross-sectional view Figure 2 ;

[0048] Fig.14 The upper joint and the lower joint are separated, (a) is a cross-sectional view Figure 1 , (b) is a cross-sectional view Figure 2 .

[0049] In the figure, 1-upper joint, 2-stop screw, 3-upper umbrella pin, 4-steel ball, 5-piston, 6-pull rod, 7-pull rod crossbeam, 8-shear pin, 9-lower umbrella pin, 10-external compression spring, 11-internal compression spring, 12-lower joint, 13-stop screw groove platform, 14-waist groove, 15-stop screw notch, 16-key tongue, 17-umbrella pin hole, 18-pin hole, 19-horseshoe groove platform, 20-shear pin hole, 21-claw, 22-upper joint clamping screw, 23-piston clamping screw, 24-open circular groove, 25-crescent-shaped notch. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] like Figure 1 and 7 As shown, the uncontrolled separation device for recovering parachutes of unmanned aerial vehicles of this embodiment includes an upper joint 1, an upper parachute pin 3, a steel ball 4, a piston 5, a pull rod 6, a pull rod cross beam 7, a shear pin 8, a lower parachute pin 9, an outer compression spring 10, an inner compression spring 11 and a lower joint 12.

[0057] Two ear blocks are symmetrically arranged above the upper joint 1, and the ear blocks are respectively provided with umbrella pin holes 17. The upper umbrella pin 3 passes through the umbrella pin holes 17 and is fixed by screwing in the stop screw 2. The upper umbrella pin 3 is used to connect the recovery umbrella through the sling. The lower edge of the upper joint 1 is an open structure and extends slightly inward, and the interior of the upper joint 1 forms a cavity for inserting the upper part of the lower joint 12.

[0058] A cavity is provided inside the lower joint 12 , wherein the diameter of the cavity at the lower part is larger than the diameter of the cavity at the upper part, and the cavity inside the lower joint 12 is used to accommodate the pull rod 6 .

[0059] The diameter of the lower portion of the lower joint 12 is greater than the diameter of the upper portion, and a truncated cone is formed between the two.

[0060] The upper portion of the lower joint 12 is symmetrically provided with a plurality of circular holes along the circumferential direction, and the steel balls 4 can be inserted into the circular holes.

[0061] Two arc-shaped ear blocks are symmetrically arranged at the lower part of the lower joint 12, and the ear blocks are respectively provided with umbrella pin holes 17, and the lower umbrella pin 9 passes through the umbrella pin holes 17 and is fixed by screwing in the stop screw 2. The lower umbrella pin 9 is used to connect the drone through the sling.

[0062] A pin hole 18 is symmetrically formed above the umbrella pin hole 17 in the lower joint 12 for inserting the shear pin 8. The pin hole 18 on the lower joint 12 has the same diameter as the shear pin 8. A waist-shaped groove 14 is extended to one side of the pin hole 18, and the depth of the waist-shaped groove 14 is slightly greater than the diameter of the shear pin 8. After the two ends of the inserted shear pin 8 are bent, the bent portion can be accommodated in the waist-shaped groove 14, thereby ensuring that the shear pin 8 does not protrude from the outer surface of the lower joint 12.

[0063] The bottom of the lower joint 12 is formed with a hook portion so as to be compatible with the assembly tool.

[0064] The structure of the pull rod 6 is adapted to the cavity structure in the lower joint 12. The upper portion of the pull rod 6 is inserted into the cavity at the upper portion of the lower joint 12, and the lower portion is located in the cavity at the lower portion of the lower joint 12.

[0065] The bottom of the pull rod 6 is an open structure, and the two sides are respectively provided with open circular grooves 24 for the pull rod cross beam 7 to be loaded. If the pull rod cross beam 7 is rotated 90 degrees from the open circular groove 24 of the pull rod 6, the pull rod cross beam 7 can be taken out from the open circular groove 24 from the top.

[0066] A crescent-shaped notch 25 is formed in the axial direction of the tie rod cross beam 7, and the diameter of the notch arc is the same as the diameter of the lower umbrella pin 9. A shear pin hole 20 is formed inside the tie rod cross beam 7, and its diameter is the same as the shear pin 8. In this embodiment, the shear pin hole 20 is an eccentric structure, and the function of the shear pin hole 20 is that after the shear pin 8 is inserted, the tie rod cross beam 7 cannot rotate around the shear pin hole.

[0067] In this embodiment, the length of the tie rod cross beam 7 is the same as the transverse length of the tie rod 6, and the length is the same as the diameter of the cavity of the lower joint 12 where the tie rod 6 is placed, with only a clearance left for matching.

[0068] Through the cooperation between the pull rod cross beam 7 and the pull rod 6, it can be greatly facilitated to insert or remove the lifting ring of the sling under the recovery umbrella, thereby improving the on-site adaptability of the device.

[0069] The outer compression spring 10 is sleeved on the outside of the lower joint 12, and the bottom of the outer compression spring 10 contacts the truncated cone. When the upper joint 1 and the lower joint 12 are not separated, the upper part of the outer compression spring 10 contacts the bottom of the upper joint 1.

[0070] The inner compression spring 11 and the piston 5 are arranged in the cavity at the upper part of the lower joint 12. One end of the piston 5 is an internal thread interface, and the other end is an internal hexagon interface. The piston 5 is provided with a receiving cavity corresponding to the number and position of the steel balls 4, and the receiving cavity is used to receive the steel balls 4; the receiving cavity is an open structure in an eight-shaped shape, so as to facilitate the entry or exit of the steel balls 4. The inner compression spring 11 is sleeved on the pull rod 6, and the piston 5 is screwed into the top of the pull rod 6 and pressed on the inner compression spring 11.

[0071] like Figure 2 As shown, the assembly tool used in the uncontrolled separation device for the recovery parachute of the unmanned aerial vehicle in this embodiment includes a clamping claw 21, two clamping screws 22 and a piston clamping screw 23. The clamping claw 21 is a U-shaped structure, and the open end of the clamping claw 21 is provided with a hook portion that can hook the lower joint 12. The clamping screw 22 and the piston clamping screw 23 are screwed into the closed end of the clamping claw 21, respectively, and the piston clamping screw 23 is located between the two clamping screws 22. During assembly, the piston clamping screw 23 faces the piston 5, and the two clamping screws 22 face the two sides of the upper joint 1.

[0072] When assembling the uncontrolled separation device for the recovery parachute of the unmanned aerial vehicle of this embodiment, first install the pull rod cross beam 7 into the open circular groove of the pull rod 6, and insert the assembly of the two into the cavity on the lower joint 12. Put the inner compression spring 11 into the cavity on the upper part of the lower joint 12, then use a tool to screw the inner thread end of the piston 5 into the outer thread end of the pull rod 6, put the steel ball 4 with grease into the corresponding circular hole on the upper part of the lower joint 12, and install the outer compression spring 10 at the corresponding position outside the lower joint 12. The lower joint 12 has a truncated cone that is tightly matched with the inner mouth of the outer compression spring 10. The above parts constitute the lower joint assembly.

[0073] Screw two upper joint clamping screws 22 and one piston clamping screw 23 into the corresponding positions of the claw 21. The screws are screwed in but not protruding. The piston clamping screw 23 is in the middle and the upper joint 1 clamping screws 22 are on both sides to form an assembly tooling component.

[0074] like Figures 1 to 3 As shown, the upper joint 1 is inserted into the upper end of the lower joint 12, and the outer compression spring 10 is in a naturally stretched state to form a preliminary upper and lower joint assembly. At this time, the assembly tool assembly is inserted into the upper and lower joint 12 assembly, and the upper joint compression screws 22 on the left and right sides of the assembly tool assembly are tightened alternately until the upper joint 1 and the lower joint 12 are completely tightened.

[0075] Gradually tighten the piston compression screw 23 in the middle of the assembly tool. During the tightening process, observe whether the shear pin hole 20 on the tie rod cross beam 7 is aligned with the corresponding plug hole 18 of the lower joint 12. When the plug hole 18 on the tie rod cross beam 7 is concentric with the corresponding plug hole 18 of the lower joint 12, rotate the tie rod cross beam 7 90 degrees and take it out from the open circular groove of the tie rod 6. Insert the tie rod cross beam 7 into the ring of the sling under the recovery umbrella, and then put the tie rod cross beam 7 into the open circular groove of the tie rod 6 with the crescent notch facing sideways. After putting it in, rotate the tie rod cross beam 7 90 degrees to reset it.

[0076] like Figure 1 , 4 As shown in FIG. 8 , the shear pin 8 is inserted, and the shear pin 8 passes through the lower joint 12 and the tie rod cross beam 7 in sequence, and then the two ends of the shear pin 8 are bent, and the bent part is inserted into the waist-shaped groove 14 on one side of the pin hole 18 of the lower joint 12.

[0077] Compared with the prior art, in this embodiment, the pull rod 6 and the pull rod cross beam 7 are placed in the internal recess of the lower joint 12. During the parachute opening process, if the separation device collides with the drone, the shear pin 8 can be effectively protected from being damaged.

[0078] like Figure 5 As shown, after the shear pin 8 is installed, the assembly tool is removed.

[0079] like Figure 1 ,6 As shown in FIG. 8 , the lower joint 12 is provided with an umbrella pin hole 17 , which is clearance-matched with the lower umbrella pin 9 , and a stop screw groove platform 13 is provided next to the umbrella pin hole 17 of the lower joint 12 .

[0080] Pass the lower umbrella pin 9 through the lower joint 12 and the recovery umbrella lower sling ring in sequence, align the notch of the lower umbrella pin 9 with the corresponding notch of the umbrella pin hole 17 of the lower joint 12, and screw the stop screws 2 into the two ends of the lower joint 12 respectively. The stop screws 2 and the lower umbrella pin 9 do not protrude from the outer surface of the lower joint 12, and ensure that the lower umbrella pin 9 is fixed on the lower joint 12.

[0081] like Figure 6 and 9 As shown, the upper joint 1 is provided with an umbrella pin hole 17, which is clearance-matched with the upper umbrella pin 3, a stop screw groove platform 13 is provided next to the umbrella pin hole 17 of the upper joint 1, and a keyhole groove is provided in the umbrella pin hole 17 of the upper joint 1, which is matched with the key tongue 16 of the upper umbrella pin 3.

[0082] One end of the upper umbrella pin 3 is a big head, and the other end is a small head. The big head end is provided with a notch 15 that cooperates with the stop screw 2, and the small head end is provided with a key tongue 16.

[0083] The upper umbrella pin 3 is passed through the upper joint 1 and the recovery umbrella upper sling ring in sequence. When the upper umbrella pin 3 passes through the upper joint 1, it is necessary to align the key tongue 16 of the upper umbrella pin 3 with the keyhole slot of the upper joint 1. After the upper umbrella pin 3 completely passes through the upper joint 1 and the recovery umbrella upper sling ring, it is rotated at a certain angle so that the key tongue 16 hooks the horseshoe-shaped groove platform 19 on one side of the upper joint 1, and at the same time, the stop screw notch 15 on the other side of the upper joint 1 is aligned with the stop screw notch 15 at the large head end of the upper umbrella pin 3, and the stop screw 2 is screwed in. The stop screw 2 and the upper umbrella pin 3 do not protrude from the outer surface of the upper joint 1, and it is ensured that the upper umbrella pin 3 is fixed on the upper joint 1.

[0084] In this embodiment, the upper parachute pin 3 and the upper joint 1 adopt a key tongue 16 and a keyhole groove structure, the main purpose of which is to quickly disassemble and assemble the upper parachute pin 3 (the upper parachute pin 3 can be taken out by disassembling a screw. When there is no flight mission, the lower sling and the separation joint are generally connected to the drone, and the recovery parachute and the upper sling are placed in another special package, so there is a need for quick disassembly and assembly of the upper parachute pin 3), and to ensure that the upper parachute pin 3 and its stop structure do not protrude from the surface of the upper joint 1. Avoid the combination of a pin shaft with a hole and a split pin commonly used in the prior art, because this combination causes the split pin to be exposed, and when the pin shaft structure with a hole is accidentally hit, the split pin has the risk of being cut off.

[0085] like Fig.10 and 11As shown, after assembly, the steel ball 4 only has rolling motion. Under the coordination of the elastic force and structural dimensions of the external compression spring 10, the steel ball has no internal impact motion. The steel ball is always in close contact with the lower edge of the upper joint 1, and there is only a small gap between the upper end of the lower joint 12 and the upper wall of the inner cavity of the upper joint 1, thereby avoiding structural damage or plastic deformation caused by internal impact. If an external impact occurs, such as the upper joint 1 or the lower joint 12 hitting the drone structure during the parachute opening process, it will not cause the steel ball 4 to move in the axial direction of the separation device.

[0086] like Fig.12 As shown, when the UAV is recovered, after the recovery parachute is inflated, the upper and lower slings are forced to straighten, and the lower sling pulls the tie rod beam 7 downward to cut the shear pin 8, so that the notched arc of the tie rod beam 7 fits with the lower parachute pin 9, and the tie rod beam 7 and the lower parachute pin 9 jointly bear the tension of the lower sling. The downward movement of the tie rod beam 7 also drives the piston 5 to move downward. During the movement, the cylindrical section of the piston 5 always supports the steel ball 4, ensuring that the upper and lower joints 12 are always in a locked state. During the landing stage of the UAV, the upper parachute pin 3 is subject to the resistance of the recovery parachute, the lower parachute pin 9 is subject to the gravity of the UAV, and the tie rod 6 and the piston 5 are simultaneously subject to the elastic force of the internal compression spring 11, and the elastic force of the internal compression spring 11 is much smaller than the gravity of the UAV.

[0087] like Fig.13 As shown, when the UAV lands, the speed of the UAV decreases to zero vertical velocity in a very short time. At this moment, the balance of force is broken, the lower sling bends and softens instantly, and the force of the lower sling acting on the pull rod cross beam 7 disappears. Under the action of the internal compression spring 11, the piston 5 moves upward rapidly until the fork-shaped structure of the pull rod 6 contacts the lower joint 12. At this moment, the middle accommodating cavity of the piston 5 is aligned with the steel ball 4, and the steel ball 4 slides into the accommodating cavity.

[0088] like Fig.14 As shown, since the locking effect of the steel ball 4 disappears, the upper joint 1 and the lower joint 12 are separated from each other under the drive of the external compression spring 10, thereby achieving timely separation of the drone and the recovery parachute.

[0089] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A controlless separation device for recovering parachutes of unmanned aerial vehicles, characterized in that: It includes a first connection part for connecting with a recovery parachute and a second connection part for connecting with a drone; A mechanical separation mechanism is connected between the first connection portion and the second connection portion; When the pulling force of the drone disappears, the mechanical separation mechanism drives the first connection part to separate from the second connection part; The mechanical separation mechanism includes a pull rod, a shearing component, a piston, a ball, an inner compression spring and an outer compression spring; The pull rod is arranged in the inner cavity of the second connecting part; The upper part of the second connecting part is provided with a plurality of circular holes along the circumferential direction, and balls are arranged in each of the circular holes; The lower part of the second connecting part is provided with a round table adapted to the external compression spring, and the external compression spring is sleeved on the second connecting part; The inner pressure spring is sleeved on the pull rod, the upper part of the pull rod is connected to the piston, the inner pressure spring and the piston are both located in the inner cavity, and the piston can slide along the inner cavity; The piston is provided with a cavity for accommodating the ball; when the cavity and the circular hole are positioned opposite to each other, the ball slides into the cavity; After the assembly is completed, the shearing component can pass through the tie rod and the second connecting part, and the three are connected; After assembly, the ball is located in the first connection part and is in close contact with the lower edge of the first connection part; the shear component includes a tie rod crossbeam and a shear pin, and the tie rod crossbeam is provided with a first latch hole for the shear pin to pass through, and the first latch hole is an eccentric hole; the shear pin can pass through the second connection part and the tie rod crossbeam to connect the two; The pull rod cross beam is locked or separated from the pull rod by rotation.

2. According to claim 1, the uncontrolled separation device for the recovery parachute of a drone is characterized by: The second connecting portion is provided with a second pin hole for the shear pin to pass through, and the second pin hole extends outwardly to form a waist-shaped groove, and the depth of the waist-shaped groove is slightly greater than the diameter of the shear pin.

3. The uncontrolled separation device for recovering parachutes of unmanned aerial vehicles according to claim 1 is characterized by: The length of the tie rod cross beam is the same as the transverse length of the tie rod, and the length is the same as the width of the groove in the lower part of the second connecting part where the tie rod is placed, with a clearance for matching.

4. The uncontrolled separation device for recovering parachutes of unmanned aerial vehicles according to claim 1 is characterized in that: The first connecting part comprises an upper joint and an upper umbrella pin. The upper joint is provided with an umbrella pin hole for inserting the upper umbrella pin, and the upper umbrella pin is clearance-matched with the umbrella pin hole.

5. The uncontrolled separation device for recovering parachutes of unmanned aerial vehicles according to claim 4 is characterized in that: The upper umbrella pin has a large head at one end and a small head at the other end, a notch is provided at the large head end, and a key tongue is provided at the small head end; A stop screw groove platform is provided next to the umbrella pin hole on one side of the upper joint, and a horseshoe-shaped groove platform is provided next to the umbrella pin hole on the other side; The umbrella pin hole is provided with a keyhole groove matching with the upper umbrella pin key tongue; After the upper umbrella pin passes through the upper joint and rotates, the key tongue at the small head end hooks the horseshoe-shaped groove platform, the notch at the large head end is opposite to the notch of the stop screw, and the stop screw is screwed in.

6. The uncontrolled separation device for recovering parachutes of unmanned aerial vehicles according to claim 1 is characterized in that: The second connecting part comprises a lower joint and a lower umbrella pin. The lower joint is provided with an umbrella pin hole for inserting the lower umbrella pin, and the lower umbrella pin is clearance-matched with the umbrella pin hole.

7. The uncontrolled separation device for recovering parachutes of unmanned aerial vehicles according to claim 6 is characterized by: Notches are respectively provided at both ends of the lower umbrella pin, and a stop screw groove platform is provided beside the umbrella pin hole; After the lower umbrella pin is inserted into the umbrella pin hole, the stop screws are screwed into the stop screw groove platforms respectively.

8. The assembly tool for the uncontrolled separation device for the recovery parachute of the unmanned aerial vehicle according to claim 1 is characterized by: It includes a clamping claw, a first clamping screw and a second clamping screw; The clamping claw is a U-shaped structure, and the open end is provided with a hook portion capable of hooking the second connecting portion; The first clamping screw and the second clamping screw are arranged at the closed end of the jaw; There are two first clamping screws, which are respectively located on both sides of the second clamping screw; During assembly, the second clamping screw faces the mechanical separation mechanism, and the first clamping screw faces the first connecting portion.

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