A safety device for a tandem dual-rotor unmanned helicopter

Abstract

The present application relates to the technical field of longitudinal double-rotor unmanned helicopter, and discloses a safety guarantee device for longitudinal double-rotor unmanned helicopter, which comprises a mounting unit, a transmission unit, a moving unit, a turnover unit and an expansion unit, wherein the mounting unit comprises a longitudinal double-rotor unmanned helicopter body, mounting brackets are arranged around the bottom of the longitudinal double-rotor unmanned helicopter body, and the four mounting brackets are symmetrically arranged in pairs. When the moving plate moves downward, the fixed rod can drive the fixed plate to move downward, the fixed plate can extrude the guide sliding block in the second sliding mechanism to move downward under the assistance of the guide sliding groove, and when the guide sliding block moves downward, the placing plate can be pushed out of the supporting leg to slide by the swing rod, so that the contact area between the supporting leg and the ground is increased, and the longitudinal double-rotor unmanned helicopter body can not be inclined after landing when the ground is uneven.

Description

Technical Field

[0001] This invention belongs to the technical field of tandem dual-rotor unmanned helicopters, specifically, it relates to a safety protection device for tandem dual-rotor unmanned helicopters. Background Technology

[0002] A tandem rotor unmanned helicopter has a rotor pylon at both the front and rear of the fuselage. Two identical rotors are mounted on the two pylons, but rotate in opposite directions, allowing their reaction torques to balance each other. A key advantage of this design is its large longitudinal center of gravity, which allows for a larger fuselage design. It is well-suited for medium and large helicopters.

[0003] However, when landing on a raised part of the ground, existing tandem rotor unmanned helicopters are prone to collisions with the cameras on their underside, causing damage. Furthermore, the uneven ground surface increases the risk of the helicopter tipping over, posing a significant danger.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A safety protection device for a tandem dual-rotor unmanned helicopter includes an installation unit, a transmission unit, a movement unit, a tilting unit, and an expansion unit.

[0007] The installation unit includes a tandem twin-rotor unmanned helicopter body. The bottom of the tandem twin-rotor unmanned helicopter body is provided with mounting brackets on all four sides. The four mounting brackets are symmetrical to each other in pairs. Support legs are connected between each pair of the bottom of the four mounting brackets. An installation plate is fixedly installed in the internal cavity of the tandem twin-rotor unmanned helicopter body. The installation plate has a rectangular slot. The internal cavity of the tandem twin-rotor unmanned helicopter body is also provided with a C-shaped installation plate. The two opposite side walls of the two support legs are respectively provided with placement slots.

[0008] The transmission unit includes a dual-axis motor. The output ends of the dual-axis motors are respectively fixedly connected to rotating rods. Gear sets are respectively installed at opposite ends of the two rotating rods, and rotating rods are fixedly mounted on the gear sets. Positioning mechanisms are provided on the two rotating rods. The two rotating rods movably penetrate the body of the tandem dual-rotor unmanned helicopter. A rotating shaft is fixedly connected above each of the two rotating rods. A rotating knob is fixedly connected above each of the two rotating shafts. Three fixed supports are fixedly installed around the two rotating knobs in a circular arrangement. A slot is opened at the bottom of each fixed support. A rotor is inserted into the inner cavity of each fixed support. A fixing block is fixedly connected to one side wall of each rotor near the rotating knob. Each fixing block movably penetrates the inner cavity of the slot. Circular moving plates are sleeved on each of the two rotating rods. A pressing mechanism is provided above the two circular moving plates. Sliding components are provided on opposite side walls of the inner cavity of each fixed support.

[0009] The mobile unit includes a hydraulic cylinder, which is mounted on a C-shaped mounting plate. A mobile plate is mounted above the hydraulic cylinder. Four connecting rods arranged in a circular pattern are fixedly mounted on both ends of the mobile plate. Each connecting rod moves through the mounting plate and the body of the tandem dual-rotor unmanned helicopter, and each of the four connecting rods is fixedly connected to the bottom of the circular mobile plate.

[0010] The flipping unit includes two flipping plates, each with a rotating rod fixedly inserted through it. Bearings are installed at both ends of each rotating rod, and two torsion springs are installed on each rotating rod. Each torsion spring has its ends located on opposite side walls of the bearing and the flipping plate. Each bearing is installed on the inner wall of the tandem dual-rotor unmanned helicopter body. A limit plate is installed at the bottom of the two flipping plates. Two symmetrical telescopic rods are fixedly installed above the limit plate, with the other ends of the telescopic rods fixedly connected to a C-shaped mounting plate. A camera assembly is installed at the bottom of the limit plate.

[0011] The expansion unit includes two placement plates, which slide through the placement slots opened in the inner cavity of the support leg, and the two placement plates are symmetrical to each other.

[0012] In a preferred embodiment of the present invention, the gear set mechanism includes two first bevel gears, which are respectively fixedly connected to opposite ends of two rotating rods. A second bevel gear is vertically meshed and installed above each of the two first bevel gears, and a rotating rod is fixedly connected above the two second bevel gears.

[0013] In a preferred embodiment of the present invention, the positioning mechanism includes two bearing sleeves, which are respectively disposed on the rotating rod. Connecting brackets are fixedly connected to both ends of the two bearing sleeves, and the opposite ends of the two connecting brackets are fixedly connected to the inner wall of the tandem dual-rotor unmanned helicopter body.

[0014] In a preferred embodiment of the present invention, each of the sliding components includes a groove and a slider. Each groove is formed on opposite side walls of the inner cavity of the fixed bracket, and a slider is slidably installed in the inner cavity of each groove. Each slider is fixedly connected to the propeller in pairs. A first return spring is fixedly connected to one side wall of each slider, and the other end of the first return spring is fixedly connected to the inner cavity of the groove.

[0015] In a preferred embodiment of the present invention, the extrusion mechanism includes two circular extrusion cylinders, which are respectively fixedly connected to a circular moving plate. Three inclined blocks arranged in a circular pattern are slidably disposed above the two circular extrusion cylinders. Each inclined block is movably inserted through a slot opened at the bottom of a fixed bracket, and a fixed block is attached to the inclined surface of each inclined block.

[0016] In a preferred embodiment of the present invention, two mutually symmetrical limiting rods are fixedly installed at the bottom of the movable plate. The two limiting rods are respectively movably inserted through the C-shaped mounting plate and are located above one end of the two flip plates. Four mutually symmetrical fixing rods are also fixedly installed at the bottom of the two movable plates. The bottom of the four fixing rods is fixedly connected to fixing plates. The four fixing plates are movably inserted through the side wall of the C-shaped mounting plate, and the other ends of the four fixing plates are respectively movably disposed in the inner cavity of the mounting bracket.

[0017] In a preferred embodiment of the present invention, a first sliding mechanism is provided at the bottom of both flip plates. The two first sliding mechanisms include two movable slides. The two movable slides are respectively opened at the bottom of the flip plates. The two movable slides are symmetrical to each other. A movable slider is slidably installed in the inner cavity of each of the two movable slides. The two movable sliders are symmetrical to each other.

[0018] In a preferred embodiment of the present invention, each of the two movable sliders and the limiting plate is provided with a rotating assembly on one side wall opposite to each other, and each of the rotating assemblies is provided with a movable rod on one side opposite to the other, and the two movable rods are symmetrical to each other.

[0019] In a preferred embodiment of the present invention, a second sliding mechanism is provided on the opposite side walls of the inner cavities of the two support legs. The second sliding mechanism includes four guide grooves, which are respectively opened on the opposite side walls of the inner cavities of the support legs. Guide sliders are slidably installed in the inner cavities of the four guide grooves, and the four guide sliders are symmetrical to each other.

[0020] In a preferred embodiment of the present invention, a rocker arm is movably mounted at one end of each of the four guide sliders away from the guide groove, and the other end of each rocker arm is movably connected to the placement plate. A second return spring is fixedly mounted at the bottom of each guide slider, and the other end of the second return spring is fixedly connected to the guide groove.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] In this invention, when the movable plate moves downward, it can also drive the fixed plate downward through the fixed rod. When the fixed plate moves downward, it can squeeze the guide slider in the second sliding mechanism, which can move downward with the assistance of the guide groove. When the guide slider moves downward, it can push the placement plate to slide out in the support leg through the swing rod, thereby increasing the contact area between the support leg and the ground. This ensures that the tandem dual-rotor unmanned helicopter will not tilt after landing when the ground is uneven.

[0023] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0024] In the attached diagram:

[0025] Figure 1 A three-dimensional structural diagram of a safety protection device for a tandem dual-rotor unmanned helicopter;

[0026] Figure 2 A schematic diagram of the internal cavity structure of a tandem dual-rotor unmanned helicopter, which is a safety protection device for a tandem dual-rotor unmanned helicopter.

[0027] Figure 3 A side view of the internal cavity structure of a tandem dual-rotor unmanned helicopter body, which is a safety protection device for a tandem dual-rotor unmanned helicopter.

[0028] Figure 4 A safety protection device for a tandem twin-rotor unmanned helicopter Figure 3 Enlarged structural diagram at point A in the middle;

[0029] Figure 5 A schematic diagram of the rotor structure of a tandem dual-rotor unmanned helicopter safety protection device;

[0030] Figure 6 A schematic diagram of the tandem dual-rotor unmanned helicopter body from below, illustrating a safety protection device for a tandem dual-rotor unmanned helicopter.

[0031] Figure 7 A safety protection device for a tandem twin-rotor unmanned helicopter Figure 6 Enlarged structural diagram at point B;

[0032] Figure 8 A schematic diagram of the internal cavity structure of the support leg of a tandem dual-rotor unmanned helicopter safety device;

[0033] Figure 9 A safety protection device for a tandem twin-rotor unmanned helicopter Figure 8 Enlarged structural diagram at point C.

[0034] In the picture:

[0035] 100. Mounting unit; 101. Tandem dual-rotor unmanned helicopter body; 1011. Mounting bracket; 1012. Support leg; 102. Mounting plate; 1021. C-shaped mounting plate; 103. Rectangular slot;

[0036] 200. Transmission unit; 201. Dual-axis motor; 2011. Rotating rod; 2012. First bevel gear; 2013. Second bevel gear; 2014. Rotating rod; 2018. Bearing sleeve; 2015. Connecting bracket; 2017. Rotating shaft; 202. Rotating knob; 2021. Fixed bracket; 2022. Propeller; 2023. Sliding assembly; 2024. First return spring; 2025. Groove; 203. Circular moving plate; 2031. Circular extrusion cylinder; 2032. Inclined block; 2033. Fixed block;

[0037] 300. Moving unit; 301. Hydraulic cylinder; 3011. Moving plate; 3012. Connecting rod; 302. Fixing rod; 3021. Fixing plate; 303. Limiting rod;

[0038] 400, Flip unit; 401, Flip plate; 4011, Bearing; 4012, Rotating rod; 4013, Torsion spring; 402, Moving slide; 4021, Moving slider; 4022, Movable rod; 4023, Rotating assembly; 403, Limiting plate; 4031, Camera assembly;

[0039] 500, Extension unit; 501, Placement plate; 5011, Guide groove; 5012, Guide slider; 5013, Rocker arm; 5014, Second return spring. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0041] Example 1:

[0042] like Figures 1 to 9 As shown, a safety device for a tandem dual-rotor unmanned helicopter includes an installation unit 100, a transmission unit 200, a moving unit 300, a flipping unit 400, and an extension unit 500. The installation unit includes a tandem dual-rotor unmanned helicopter body 101. Mounting brackets 1011 are provided around the bottom of the tandem dual-rotor unmanned helicopter body 101. The four mounting brackets 1011 are symmetrical to each other in pairs. Support legs 1012 are connected between each pair of the bottom of the four mounting brackets 1011. An installation plate 102 is fixedly installed in the inner cavity of the tandem dual-rotor unmanned helicopter body 101. A rectangular slot 103 is opened on the installation plate 102. A C-shaped installation plate 1021 is also provided in the inner cavity of the tandem dual-rotor unmanned helicopter body 101. Placement slots are opened on the opposite side walls of the two support legs 1012.

[0043] The transmission unit 200 includes a dual-axis motor 201. Rotary rods 2011 are fixedly connected to the output ends of the dual-axis motors 201. Gear sets are respectively installed at opposite ends of the two rotary rods 2011, and rotating rods 2014 are fixedly mounted on the gear sets. Positioning mechanisms are provided on the two rotating rods 2014. The two rotating rods 2014 movably pass through the tandem dual-rotor unmanned helicopter body 101. Rotating shafts 2017 are fixedly connected above each of the two rotating rods 2014. Rotating knobs 202 are fixedly connected above the two rotating shafts 2017. Three angled... The fixed supports 2021 are arranged in a circular pattern. Each fixed support 2021 has a slot 2025 at its bottom. Each fixed support 2021 has a spiral blade 2022 inserted into its inner cavity. Each spiral blade 2022 is fixedly connected to a fixed block 2033 near one side wall of the rotating knob 202. Each fixed block 2033 is movably inserted through the inner cavity of the slot 2025. Circular moving plates 203 are sleeved on two rotating rods 2014. A pressing mechanism is provided above the two circular moving plates 203. Sliding components 2023 are provided on the opposite side walls of the inner cavity of each fixed support 2021.

[0044] The mobile unit 300 includes a hydraulic cylinder 301, which is mounted on a C-shaped mounting plate 1021. A mobile plate 3011 is mounted above the hydraulic cylinder 301. Four connecting rods 3012 arranged in a circular pattern are fixedly mounted on both ends of the mobile plate 3011. Each connecting rod 3012 moves through the mounting plate 102 and the tandem dual-rotor unmanned helicopter body 101, and each of the four connecting rods 3012 is fixedly connected to the bottom of the circular mobile plate 203.

[0045] The flipping unit 400 includes two flipping plates 401, each with a rotating rod 4012 fixedly passing through it. Bearings 4011 are respectively installed at both ends of the rotating rods 4012, and two torsion springs 4013 are installed on each of the rotating rods 4012. Each torsion spring 4013 has its ends respectively located on the opposite side walls of the bearings 4011 and the flipping plate 401. Each bearing 4011 is installed on the inner wall of the tandem dual-rotor unmanned helicopter body 101. A limiting plate 403 is installed at the bottom of the two flipping plates 401. Two symmetrical telescopic rods are fixedly installed above the limiting plate 403, and the other ends of the telescopic rods are fixedly connected to a C-shaped mounting plate 1021. A camera assembly 4031 is installed at the bottom of the limiting plate 403. The expansion unit 500 includes two placement plates 501, which are slidably installed through placement slots opened within the inner cavity of the support leg 1012. The two placement plates 501 are symmetrical to each other. When the movable plate 3011 moves downward, it will drive the limiting rod 303 to move downward. At this time, the two limiting rods 303 press the flipping plate 401, which can flip with the assistance of the bearing 4011 and the rotating rod 4012. Because the flipping plate 401 is provided with a first sliding mechanism at its bottom, when the flipping plate 401 flips, the movable slider 4021 in the first sliding mechanism can pull the limiting plate 403 at the other end through the movable rod 4022. Because the limiting plate 403 is limited vertically by the telescopic rod, the limiting plate 403 can only move upward. At this time, the movable slider 4021 can move downward. The moving plate 3011 moves downward within the sliding groove 402. Simultaneously, when the moving plate 3011 moves downward, it can also drive the fixed plate 3021 downward through the fixed rod 302. When the fixed plate 3021 moves downward, it can squeeze the guide slider 5012 in the second sliding mechanism. With the assistance of the guide groove 5011, it can move downward. When the guide slider 5012 moves downward, it can push the placement plate 501 to slide out within the support leg 1012 through the swing rod 5013. This increases the contact area between the support leg 1012 and the ground, ensuring that the tandem dual-rotor unmanned helicopter will not tilt after landing when the ground is uneven.

[0046] like Figures 2 to 4As shown, in a specific embodiment, the gear set mechanism includes two first bevel gears 2012, which are respectively fixedly connected to opposite ends of two rotating rods 2011. Second bevel gears 2013 are vertically meshed and mounted above each of the two first bevel gears 2012, and rotating rods 2014 are fixedly connected above the two second bevel gears 2013. In this configuration, the specific components and connection relationships of the gear set mechanism are defined.

[0047] like Figures 2 to 4 As shown, the positioning mechanism further includes two bearing sleeves 2018, which are respectively mounted on the rotating rod 2014. Connecting brackets 2015 are fixedly connected to both ends of the two bearing sleeves 2018, and the opposite ends of the two connecting brackets 2015 are fixedly connected to the inner wall of the tandem dual-rotor unmanned helicopter body 101. In this configuration, the installation position and components of the positioning mechanism are determined.

[0048] like Figure 5 As shown, each sliding component 2023 further includes a groove and a slider. Each groove is formed on opposite side walls of the inner cavity of the fixed bracket 2021, and a slider is slidably mounted in each groove. Each slider is fixedly connected to the propeller 2022 in pairs. A first return spring 2024 is fixedly connected to one side wall of each slider, and the other end of the first return spring 2024 is fixedly connected to the inner cavity of the groove. In this configuration, the installation position and components of the sliding components are determined.

[0049] Example 2:

[0050] The difference between the above embodiments and this embodiment is that: Figures 1 to 3 and Figures 5 to 6 as well as Figure 8 As shown, a safety device for a tandem dual-rotor unmanned helicopter includes a compression mechanism comprising two circular compression cylinders 2031, which are fixedly connected to a circular movable plate 203. Three circumferentially distributed inclined blocks 2032 are slidably disposed above each of the two compression cylinders 2031. Each inclined block 2032 movably passes through a slot 2025 at the bottom of a fixed bracket 2021. A fixed block 2033 is attached to the inclined surface of each inclined block 2032. The installation position and components of the compression mechanism are thus determined.

[0051] like Figures 2 to 3 and Figure 6As shown, in a specific embodiment, two mutually symmetrical limiting rods 303 are fixedly installed at the bottom of the movable plate 3011. The two limiting rods 303 movably penetrate the C-shaped mounting plate 1021 and are located above one end of each of the two flip plates 401. Four mutually symmetrical fixing rods 302 are also fixedly installed at the bottom of the two movable plates 3011. Fixing plates 3021 are fixedly connected to the bottom of the four fixing rods 302, movably penetrating the sidewall of the C-shaped mounting plate 1021. The other ends of the four fixing plates 3021 are movably disposed within the inner cavity of the mounting bracket 1011. In this configuration, the installation positions and components of the limiting rods 303 and fixing rods 302 are defined.

[0052] like Figures 2 to 3 and Figures 6 to 7 As shown, furthermore, each of the two flip plates 401 is provided with a first sliding mechanism at its bottom. The two first sliding mechanisms include two movable slide grooves 402, which are respectively formed at the bottom of the flip plate 401. The two movable slide grooves 402 are symmetrical to each other, and movable sliders 4021 are slidably installed in the inner cavity of each of the two movable slide grooves 402. The two movable sliders 4021 are symmetrical to each other. In this configuration, the installation position and components of the first sliding mechanism are determined.

[0053] like Figures 6 to 7 As shown, furthermore, rotating components 4023 are provided on the opposite sidewalls of the two movable sliders 4021 and the limiting plate 403, and movable rods 4022 are respectively provided on opposite sides of the rotating components 4023, with the two movable rods 4022 being symmetrical to each other. In this configuration, the installation position and connection relationship of the movable rods 4022 are determined.

[0054] Example 3:

[0055] The difference between the above embodiments and this embodiment is that: Figures 1 to 3 and Figure 6 as well as Figures 7 to 8 As shown, a safety device for a tandem dual-rotor unmanned helicopter includes a second sliding mechanism on each of the opposite side walls of the inner cavity of the two support legs 1012. Each second sliding mechanism comprises four guide grooves 5011, which are respectively formed on opposite side walls of the inner cavity of the support legs 1012. Guide sliders 5012 are slidably mounted within the inner cavities of the four guide grooves 5011, and the four guide sliders 5012 are symmetrically arranged in pairs. The installation position and components of the second sliding mechanism are thus determined.

[0056] like Figures 7 to 8As shown, in a specific embodiment, four guide sliders 5012 are movably mounted with a swing arm 5013 at one end away from the guide groove 5011. The other end of each swing arm 5013 is movably connected to the placement plate 501. A second return spring 5014 is fixedly installed at the bottom of each guide slider 5012, and the other end of the second return spring 5014 is fixedly connected to the guide groove. In this configuration, it is ensured that when the guide slider 5012 moves downward, it can push the placement plate 501 out of the support leg 1012 through the swing arm 5013, thereby increasing the contact area between the support leg 1012 and the ground. This ensures that when the ground is uneven, the tandem dual-rotor unmanned helicopter will not tilt after landing.

[0057] The implementation principle of a tandem dual-rotor unmanned helicopter safety device in this embodiment is as follows:

[0058] When the tandem twin-rotor unmanned helicopter is in flight, the dual-axis motor 201 is running, which drives the rotating rod 2011 to rotate. When the rotating rod 2011 rotates, it drives the first bevel gear 2012 to rotate. When the first bevel gear 2012 rotates, it drives the vertically meshed second bevel gear 2013 to rotate. When the second bevel gear 2013 rotates, it drives the rotating rod 2014 to rotate. When the rotating rod 2014 rotates, it drives the rotating knob 202 to rotate. When the rotating knob 202 rotates, it drives the rotor 2022 to rotate.

[0059] When the tandem dual-rotor unmanned helicopter needs to land, hydraulic cylinder 301 is activated. Hydraulic cylinder 301 retracts, pulling the movable plate 3011 downwards. As the movable plate 3011 moves downwards, it is guided downwards by limit rods 303 at both ends. The downward movement of the limit rods 303 pulls the circular movable plate 203 downwards. The downward movement of the circular movable plate 203 then drives the circular extrusion cylinder 2031 downwards. This... When the tilting block 2032 moves downward, the tilting block 2032 will lose the squeezing force on the fixing block 2033 installed at one end of the rotor 2022. As a result, the slider in the sliding assembly 2023 connected to both sides of the rotor 2022 can move horizontally in the groove with the assistance of the first return spring 2024. Therefore, the rotor 2022 can be reset. Retracting the rotor 2022 can ensure that it avoids contact with trees or other objects to a certain extent when falling, thus ensuring the installation of the rotor 2022.

[0060] Simultaneously, when the movable plate 3011 moves downward, it can drive the limiting rod 303 to move downward. At this time, the two limiting rods 303 press the flip plate 401, which can flip with the assistance of the bearing 4011 and the rotating rod 4012. Since the flip plate 401 is provided with a first sliding mechanism at the bottom, when the flip plate 401 flips, the movable slider 4021 in the first sliding mechanism can pull the limiting plate 403 at the other end to move through the movable rod 4022. Because the limiting plate 403 is limited in the vertical direction by the telescopic rod, the limiting plate 403 can only move upward. At this time, the movable slider 4021 can move in the movable slide 402. When the limiting plate 403 moves upward, it can drive the camera assembly 4031 at the bottom to move upward, thereby entering the inner cavity of the tandem dual-rotor unmanned helicopter body 101 to protect the camera assembly 4031.

[0061] Simultaneously, when the movable plate 3011 moves downward, it can also drive the fixed plate 3021 to move downward through the fixed rod 302. When the fixed plate 3021 moves downward, it can squeeze the guide slider 5012 in the second sliding mechanism. With the assistance of the guide groove 5011, it can move downward. When the guide slider 5012 moves downward, it can push the placement plate 501 to slide out of the support leg 1012 through the swing rod 5013, thereby increasing the contact area between the support leg 1012 and the ground, ensuring that the tandem dual-rotor unmanned helicopter will not tilt after landing when the ground is uneven.

Claims

1. A safety protection device for a tandem twin-rotor unmanned helicopter, comprising an installation unit (100), a transmission unit (200), a moving unit (300), a tilting unit (400), and an extension unit (500), characterized in that: The installation unit includes a tandem twin-rotor unmanned helicopter body (101). The bottom of the tandem twin-rotor unmanned helicopter body (101) is provided with mounting brackets (1011) around the four sides. The four mounting brackets (1011) are symmetrical to each other in pairs. The bottom of the four mounting brackets (1011) is connected to each other with support legs (1012). The inner cavity of the tandem twin-rotor unmanned helicopter body (101) is fixedly installed with a mounting plate (102). The mounting plate (102) has a rectangular slot (103). The inner cavity of the tandem twin-rotor unmanned helicopter body (101) is also provided with a C-shaped mounting plate (1021). The two opposite side walls of the two support legs (1012) are respectively provided with placement slots. The transmission unit (200) includes a dual-axis motor (201). The output ends of the dual-axis motor (201) are respectively fixedly connected to rotating rods (2011). Gear sets are respectively provided at opposite ends of the two rotating rods (2011), and rotating rods (2014) are fixedly mounted on the gear sets. Positioning mechanisms are provided on the two rotating rods (2014). The two rotating rods (2014) movably pass through the tandem dual-rotor unmanned helicopter body (101). Rotating shafts (2017) are fixedly connected above each of the two rotating rods (2014). Rotating knobs (202) are fixedly connected above the two rotating shafts (2017). Three rotating knobs (202) are fixedly mounted around the two rotating knobs (202). The fixed supports (2021) are arranged in a circular pattern. Each fixed support (2021) has a slot (2025) at its bottom. A rotor (2022) is inserted into the inner cavity of each fixed support (2021). A fixing block (2033) is fixedly connected to one side wall of each rotor (2022) near the rotating knob (202). Each fixing block (2033) is movably inserted through the inner cavity of the slot (2025). A circular moving plate (203) is sleeved on each of the two rotating rods (2014). A pressing mechanism is provided above the two circular moving plates (203). A sliding component (2023) is provided on the opposite side walls of the inner cavity of each fixed support (2021). The extrusion mechanism includes two circular extrusion cylinders (2031), which are fixedly connected to a circular movable plate (203). Three inclined blocks (2032) are slidably arranged in a circular pattern above the two circular extrusion cylinders (2031). Each inclined block (2032) is movably inserted through a slot (2025) at the bottom of a fixed bracket (2021). A fixed block (2033) is attached to the inclined surface of each inclined block (2032). The mobile unit (300) includes a hydraulic cylinder (301), which is mounted on a C-shaped mounting plate (1021). A mobile plate (3011) is mounted above the hydraulic cylinder (301). Four connecting rods (3012) arranged in a circular pattern are fixedly mounted on both ends of the mobile plate (3011). Each connecting rod (3012) moves through the mounting plate (102) and the tandem dual-rotor unmanned helicopter body (101). The four connecting rods (3012) are fixedly connected to the bottom of the circular mobile plate (203) in a group. The bottom of the movable plate (3011) is fixedly installed with two mutually symmetrical limiting rods (303). The two limiting rods (303) are respectively movably inserted through the C-shaped mounting plate (1021). The two limiting rods (303) are respectively located above one end of the two flip plates (401). The bottom of the movable plate (3011) is also fixedly installed with four mutually symmetrical fixing rods (302). The bottom of the four fixing rods (302) is fixedly connected with fixing plates (3021). The four fixing plates (3021) are movably inserted through the side wall of the C-shaped mounting plate (1021). The other end of the four fixing plates (3021) is respectively movably disposed in the inner cavity of the mounting bracket (1011). The flipping unit (400) includes two flipping plates (401), each of which has a rotating rod (4012) fixedly inserted through it. Each of the two rotating rods (4012) has a bearing (4011) at both ends. Each of the two rotating rods (4012) has two torsion springs (4013), and each torsion spring (4013) has its two ends respectively located on the opposite side walls of the bearing (4011) and the flipping plate (401). Each bearing (4011) is installed on the inner wall of the tandem dual-rotor unmanned helicopter body (101). A limit plate (403) is provided at the bottom of the two flipping plates (401). Two symmetrical telescopic rods are fixedly installed above the limit plate (403), and the other end of the telescopic rods is fixedly connected to a C-shaped mounting plate (1021). A camera assembly (4031) is provided at the bottom of the limit plate (403). The bottom of each of the two flip plates (401) is provided with a first sliding mechanism. The two first sliding mechanisms include two movable slides (402). The two movable slides (402) are respectively opened at the bottom of the flip plates (401). The two movable slides (402) are symmetrical to each other. The inner cavity of each of the two movable slides (402) is slidably installed with a movable slider (4021). The two movable sliders (4021) are symmetrical to each other. The side wall opposite to the two movable sliders (4021) and the limiting plate (403) is provided with a rotating component (4023). The two opposite sides of the rotating component (4023) are respectively provided with a movable rod (4022). The two movable rods (4022) are symmetrical to each other. The expansion unit (500) includes two placement plates (501), which slide through the placement slots opened in the inner cavity of the support leg (1012) respectively, and the two placement plates (501) are symmetrical to each other.

2. The safety protection device for a tandem dual-rotor unmanned helicopter according to claim 1, characterized in that, The gear set mechanism includes two first bevel gears (2012), which are fixedly connected to opposite ends of two rotating rods (2011). A second bevel gear (2013) is vertically meshed above each of the two first bevel gears (2012), and a rotating rod (2014) is fixedly connected above the two second bevel gears (2013).

3. The safety protection device for a tandem dual-rotor unmanned helicopter according to claim 1, characterized in that, The positioning mechanism includes two bearing sleeves (2018), which are respectively mounted on the rotating rod (2014). Each of the two bearing sleeves (2018) is fixedly connected to a connecting bracket (2015) at both ends. The opposite ends of the two connecting brackets (2015) are fixedly connected to the inner wall of the tandem dual-rotor unmanned helicopter body (101).

4. The safety protection device for a tandem dual-rotor unmanned helicopter according to claim 1, characterized in that, Each of the sliding components (2023) includes a groove and a slider. Each groove is formed on the opposite two side walls of the inner cavity of the fixed bracket (2021), and a slider is slidably installed in the inner cavity of each groove. Each slider is fixedly connected to the propeller (2022) in pairs. A first return spring (2024) is fixedly connected to one side wall of each slider, and the other end of the first return spring (2024) is fixedly connected to the inner cavity of the groove.

5. A safety protection device for a tandem dual-rotor unmanned helicopter according to claim 1, characterized in that, The inner walls of the two supporting legs (1012) are respectively provided with a second sliding mechanism. The second sliding mechanism includes four guide grooves (5011). The four guide grooves (5011) are formed in pairs and are respectively opened on the inner walls of the supporting legs (1012). Guide sliders (5012) are slidably installed in the inner cavities of the four guide grooves (5011). The four guide sliders (5012) are symmetrical to each other in pairs.

6. A safety protection device for a tandem dual-rotor unmanned helicopter according to claim 5, characterized in that, Each of the four guide sliders (5012) has a swing arm (5013) movably mounted at one end away from the guide groove (5011). The other end of each swing arm (5013) is movably connected to the placement plate (501). A second return spring (5014) is fixedly mounted at the bottom of each guide slider (5012), and the other end of the second return spring (5014) is fixedly connected to the inner wall of the guide groove (5011).

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