Unmanned aerial vehicle parachute cutting mechanism

Abstract

The utility model discloses an unmanned aerial vehicle parachute cutting mechanism, and relates to the field of unmanned aerial vehicle parachute recovery. The parachute cutting mechanism of the unmanned aerial vehicle comprises a right connecting plate connected with a parachute cord and a left connecting plate connected with a connecting cord on a vehicle body, and the right connecting plate and the left connecting plate are fixed together through nylon screws and nylon nuts; stepped screws are respectively inserted into the outer wall of the right connecting plate and the outer wall of the left connecting plate, and the middle parts of the faying surfaces of the right connecting plate and the left connecting plate are connected through a separation spring; a protrusion is arranged on the right connecting plate, a lifting pin assembly is arranged in the middle of the surface of the left connecting plate, the bottom end of the lifting pin assembly makes contact with the protrusion on the right connecting plate, and the lifting pin assembly is composed of a lifting pin plug cap, a lifting pin spring, a lifting pin head and a lifting pin body. The structure is simple, reliability is high, and the adopted structural form is small in size and suitable for unmanned aerial vehicles of different sizes.

Description

Technical Field

[0001] The utility model relates to the field of parachute recovery of unmanned aerial vehicles (UAVs), in particular to a parachute cutting mechanism for UAVs. Background Technology

[0002] With the advancement of technology, the drone market has gradually become hot, especially the civilian drone market, which has shown rapid growth. Fixed-wing drones often have difficulty guaranteeing a suitable runway in practical applications. Currently, most drone parachute cutters adopt electric control, which senses the aircraft landing by testing the aircraft speed, overload, or image recognition, and then controls the electric actuator to separate the parachute from the aircraft.

[0003] However, this type of parachute cutting mechanism increases the burden on the aircraft's avionics, and the system becomes more complex and less reliable, so we propose a parachute cutting mechanism for drones to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a UAV parachute-cutting mechanism that solves the problems of increased avionics burden and decreased reliability of electrically controlled UAV parachute-cutting mechanisms.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a drone umbrella cutting mechanism, including a right connecting plate connected to the parachute rope and a left connecting plate connected to the connecting rope on the drone body, wherein the right connecting plate and the left connecting plate are fixed together by nylon screws and nylon nuts;

[0006] The outer wall of the right connecting plate and the outer wall of the left connecting plate are respectively plugged with stepped screws, and the middle parts of the fitting surfaces of the right connecting plate and the left connecting plate are connected by a separation spring;

[0007] A push pin assembly is provided in the middle of the surface of the left connecting plate, and the bottom end of the push pin assembly contacts the protrusion on the right connecting plate.

[0008] Preferably, the ejector pin assembly is composed of an ejector pin plug cap, an ejector pin spring, an ejector pin head and an ejector pin body;

[0009] The ejector pin body has an external thread and is fixed to the left connecting plate. The ejector pin head can slide in the ejector pin body, and the ejector pin plug is fixed to the ejector pin body by a thread.

[0010] The ejector pin spring is fixed between the ejector pin plug and the ejector pin head.

[0011] Preferably, the outer diameter of the ejector pin plugging cap is the same as the inner diameter of the inner cavity of the ejector pin head, and the two are rotatably connected.

[0012] Preferably, one end of the ejector pin body is spherical.

[0013] Preferably, the separation spring has a certain initial preload force.

[0014] Preferably, the stepped screw located on the right connecting plate is rotatably connected to the left connecting plate, and the stepped screw located on the left connecting plate is rotatably connected to the right connecting plate.

[0015] Beneficial effects

[0016] The utility model provides a parachute cutting mechanism for a drone. Compared with the existing technology, it has the following advantages:

[0017] The UAV cutting umbrella mechanism goes through three states during use. The first state is as follows: Figure 1 As shown, the right connecting plate and the left connecting plate are fixed together by nylon screws and nylon nuts. The right connecting plate is fixed to the paracord, and the left connecting plate is fixed to the connecting rope that is fixed to the body. The two stepped screws are respectively threaded onto the right connecting plate and the left connecting plate. The separation spring is fixed between the right connecting plate and the left connecting plate and has a certain initial preload. The spring force causes the right connecting plate and the left connecting plate to tend to approach each other in the vertical direction. The top pin assembly is fixed on the left connecting plate, and the movable end of the top pin assembly contacts the protrusion on the right connecting plate, generating a force that causes the right connecting plate and the left connecting plate to separate from each other.

[0018] At the moment the parachute deploys, a very large force is generated between the right and left connecting plates, causing them to move up and down relative to each other. This force shears the nylon screw. After shearing, the right and left connecting plates continue to separate in the up-and-down direction until they contact the stepped screw. At this point, the parachute-cutting mechanism enters its second state. Figure 5 As shown, the separation spring is compressed at this time, generating a compression force that is much smaller than the gravity of the aircraft acting on the left connecting plate, so the right connecting plate and the left connecting plate will not approach each other in the vertical direction;

[0019] The force exerted on the left connecting plate by the aircraft body disappears instantly upon landing. At this moment, the right and left connecting plates move closer to each other vertically under the action of spring force. The protrusion on the right connecting plate presses against the top pin assembly connected to the left connecting plate in the left-right direction, causing the left and right connecting plates to generate a force that interacts with each other in the left-right direction. This causes the left and right connecting plates to separate in the left-right direction, and finally the parachute cutting mechanism separates, which is the third state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the first state of the umbrella cutting mechanism of the utility model;

[0021] Figure 2 This is a schematic diagram of the right-side cross-sectional structure of the umbrella-cutting mechanism of this utility model;

[0022] Figure 3 This is a schematic diagram of the left sectional view of the umbrella-cutting mechanism of this utility model;

[0023] Figure 4 This is a schematic cross-sectional view of the top pin assembly of this utility model;

[0024] Figure 5 This is a schematic diagram of the second state structure of the umbrella-cutting mechanism of this utility model.

[0025] In the diagram: 1. Right connecting plate; 2. Stepped screw; 3. Nylon screw; 4. Top pin assembly; 5. Left connecting plate; 6. Nylon nut; 7. Release spring; 41. Top pin cap; 42. Top pin spring; 43. Top pin body; 44. Top pin head. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Please see Figure 1-5 This utility model provides a technical solution: a UAV umbrella cutting mechanism, which includes a right connecting plate 1, a stepped screw 2, a nylon screw 3, a top pin assembly 4, a left connecting plate 5, a nylon nut 6, and a separation spring 7.

[0028] The umbrella-cutting mechanism goes through three states during use. The first state is as follows: Figure 1 As shown, the right connecting plate 1 and the left connecting plate 5 are fixed together by nylon screws 3 and nylon nuts 6. The right connecting plate 1 is fixed to the paracord, and the left connecting plate 5 is fixed to the connecting rope that is fixed to the body. Two stepped screws 2 are respectively threaded onto the right connecting plate 1 and the left connecting plate 5. The separation spring 7 is fixed between the right connecting plate 1 and the left connecting plate 5 and has a certain initial preload. The spring force makes the right connecting plate 1 and the left connecting plate 5 tend to approach each other in the vertical direction. The top pin assembly 4 is fixed on the left connecting plate 5. The movable end of the top pin assembly 4 contacts the protrusion on the right connecting plate 1, generating a force that separates the right connecting plate 1 and the left connecting plate 5 from right to left.

[0029] At the moment the parachute opens, a very large force is generated between the right connecting plate 1 and the left connecting plate 5, causing them to move up and down relative to each other. Under the action of this force, the nylon screw 3 will be sheared. After shearing, the right connecting plate 1 and the left connecting plate 5 will continue to separate in the up and down direction until the right connecting plate 1 and the left connecting plate 5 contact the stepped screw 2. At this time, the parachute cutting mechanism enters the second state. Figure 5 As shown, the separation spring 7 is compressed at this time, generating a compressive force. The compressive force is much smaller than the weight of the aircraft acting on the left connecting plate 5, so the right connecting plate 1 and the left connecting plate 5 will not approach each other in the vertical direction.

[0030] At the moment the aircraft lands, the force exerted on the left connecting plate 5 by the fuselage disappears instantly. At this time, the right connecting plate 1 and the left connecting plate 5 move closer to each other in the vertical direction under the action of the spring force. In the horizontal direction, the protrusion on the right connecting plate 1 will press the top pin assembly 4 connected to the left connecting plate 5, so that the left and right connecting plates generate a force that interacts in the horizontal direction, causing the left and right connecting plates to separate in the horizontal direction. Finally, the parachute cutting mechanism separates, which is to say, it enters the third state.

[0031] See Figure 2 、 Figure 4 The top pin assembly 4 consists of a top pin cap 41, a top pin spring 42, a top pin head 44, and a top pin body 43; wherein the top pin body 43 has external threads and is fixed to the left connecting plate 5, the top pin head 44 can slide inside the top pin body 43, and the top pin cap 41 is fixed to the top pin body 43 by threads; the top pin spring 42 is fixed between the top pin cap 41 and the top pin head 44.

[0032] The top pin body 43 in the top pin assembly 4 can be installed on the left connecting plate 5 and can also be inserted into the top pin head 44. Then, by rotating the top pin plug 41, it can be flexibly installed in the inner cavity of the top pin body 43 and can also limit the top pin spring 42 inserted in the top pin body 43, so that the top pin spring 42 can provide a clamping force on the top pin head 44.

[0033] See Figure 3 、 Figure 4 The outer diameter of the top pin plug 41 is the same as the inner diameter of the top pin head 44, and the two are rotatably connected, which allows the top pin plug 41 to be installed smoothly and firmly in the inner cavity of the top pin head 44.

[0034] See Figure 4 One end of the top pin 43 is spherical, which allows one end of the top pin 43 to slide on the right connecting plate 1.

[0035] See Figure 1-Figure 3The stepped screw 2 located on the right connecting plate 1 is rotatably connected to the left connecting plate 5, and the stepped screw 2 located on the left connecting plate 5 is rotatably connected to the right connecting plate 1. The two stepped screws 2 can be inserted and installed on the right connecting plate 1 and the left connecting plate 5 respectively.

[0036] During operation, the umbrella mechanism goes through three states. The first state is as follows: Figure 1 As shown, the right connecting plate 1 and the left connecting plate 5 are fixed together by nylon screws 3 and nylon nuts 6. The right connecting plate 1 is fixed to the paracord, and the left connecting plate 5 is fixed to the connecting rope that is fixed to the body. Two stepped screws 2 are respectively threaded onto the right connecting plate 1 and the left connecting plate 5. The separation spring 7 is fixed between the right connecting plate 1 and the left connecting plate 5 and has a certain initial preload. The spring force makes the right connecting plate 1 and the left connecting plate 5 tend to approach each other in the vertical direction. The top pin assembly 4 is fixed on the left connecting plate 5. The movable end of the top pin assembly 4 contacts the protrusion on the right connecting plate 1, generating a force that separates the right connecting plate 1 and the left connecting plate 5 from right to left.

[0037] At the moment the parachute opens, a very large force is generated between the right connecting plate 1 and the left connecting plate 5, causing them to move up and down relative to each other. Under the action of this force, the nylon screw 3 will be sheared. After shearing, the right connecting plate 1 and the left connecting plate 5 will continue to separate in the up and down direction until the right connecting plate 1 and the left connecting plate 5 contact the stepped screw 2. At this time, the parachute cutting mechanism enters the second state. Figure 5 As shown, the separation spring 7 is compressed at this time, generating a compressive force. The compressive force is much smaller than the weight of the aircraft acting on the left connecting plate 5, so the right connecting plate 1 and the left connecting plate 5 will not approach each other in the vertical direction.

[0038] At the moment the aircraft lands, the force exerted on the left connecting plate 5 by the fuselage disappears instantly. At this time, the right connecting plate 1 and the left connecting plate 5 move closer to each other in the vertical direction under the action of the spring force. In the horizontal direction, the protrusion on the right connecting plate 1 will press the top pin assembly 4 connected to the left connecting plate 5, so that the left and right connecting plates generate a force that interacts in the horizontal direction, causing the left and right connecting plates to separate in the horizontal direction. Finally, the parachute cutting mechanism separates, which is to say, it enters the third state.

[0039] The top pin body 43 in the top pin assembly 4 can be installed on the left connecting plate 5 and can also be inserted into the top pin head 44. Then, by rotating the top pin plug 41, it can be flexibly installed in the inner cavity of the top pin body 43 and can also limit the top pin spring 42 inserted in the top pin body 43, so that the top pin spring 42 can provide a clamping force on the top pin head 44.

[0040] In summary, this device adopts a purely mechanical parachute-cutting mechanism to achieve automatic parachute cutting upon landing. It has a simple structure, high reliability, and a small structural form, making it suitable for drones of different sizes.

[0041] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A parachute cutting mechanism for a drone, characterized by: It comprises a right connecting plate (1) connected to the parachute rope and a left connecting plate (5) connected to the connecting rope on the body, wherein the right connecting plate (1) and the left connecting plate (5) are fixed together by a nylon screw (3) and a nylon nut (6); The outer wall of the right connecting plate (1) and the outer wall of the left connecting plate (5) are respectively plugged with stepped screws (2), and the middle parts of the fitting surfaces of the right connecting plate (1) and the left connecting plate (5) are connected via a separation spring (7); A push pin assembly (4) is provided in the middle of the surface of the left connecting plate (5), and the bottom end of the push pin assembly (4) contacts the protrusion on the right connecting plate (1).

2. The parachute cutting mechanism for a drone according to claim 1, characterized in that: The ejector pin assembly (4) is composed of an ejector pin plug (41), an ejector pin spring (42), an ejector pin head (44) and an ejector pin body (43); The ejector pin body (43) has an external thread and is fixed to the left connecting plate (5); the ejector pin head (44) can slide in the ejector pin body (43); and the ejector pin plug (41) is fixed to the ejector pin body (43) by means of a thread; The ejector pin spring (42) is fixed between the ejector pin plug (41) and the ejector pin head (44).

3. The parachute cutting mechanism for a drone according to claim 2, characterized in that: The outer diameter of the ejector pin plugging cap (41) is the same as the inner diameter of the inner cavity of the ejector pin head (44), and the two are rotatably connected.

4. The parachute cutting mechanism for a drone according to claim 2, characterized in that: One end of the ejector pin body (43) is in a spherical shape.

5. The drone parachute cutting mechanism according to claim 1, characterized in that: The separation spring (7) has a certain initial preload force.

6. The parachute cutting mechanism for a drone according to claim 1, characterized in that: The stepped screw (2) on the right connecting plate (1) is rotatably connected to the left connecting plate (5), and the stepped screw (2) on the left connecting plate (5) is rotatably connected to the right connecting plate (1).

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