A multi-rotor drone landing gear

Abstract

The present application relates to the technical field of unmanned aerial vehicle, particularly relates to a multi-rotor unmanned aerial vehicle landing gear; The multi-rotor unmanned aerial vehicle landing gear provided by the present application can solve the problem that the current multi-rotor unmanned aerial vehicle landing gear is mostly fixed, and the landing gear occupies a large space; When the unmanned aerial vehicle needs to take off and land, the driving assembly drives the four supporting arms to rotate downward synchronously, so that the four supporting arms are all rotated to the vertical state, at this time, the four supporting arms are in the first state, so at this time, each supporting arm can support the unmanned aerial vehicle body; When the unmanned aerial vehicle is in flight, the driving assembly drives the four supporting arms to rotate upward synchronously, so that the four supporting arms are all rotated to the horizontal state, at this time, the four supporting arms are in the second state, at this time, two supporting arms are accommodated below the first cross arm, and the other two supporting arms are accommodated below the second cross arm, so that the four supporting arms can be accommodated, the space occupied by the unmanned aerial vehicle in flight is reduced, and the air resistance suffered in the flight process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles (UAVs), and in particular to a landing gear for a multi-rotor UAV. Background Art

[0002] Multi-rotor drones have experienced rapid development in recent years. Their simple structure and flexibility have led to widespread adoption in both military and civilian applications. Currently, multi-rotor drones on the market primarily consist of a fuselage, landing gear, boom, and rotors, along with a control system and battery, allowing for remote control via a remote control or mobile phone. However, most current multi-rotor drones utilize fixed landing gear, which occupies a large amount of space and creates significant air resistance during flight, increasing power consumption and reducing range. Summary of the Invention

[0003] The main purpose of the present invention is to provide a multi-rotor UAV landing gear, aiming to solve the problem that current multi-rotor UAVs mostly use fixed landing gear, which occupies a large space and is subject to large air resistance during flight.

[0004] To achieve the above object, the technical solution proposed by the present invention is:

[0005] A multi-rotor UAV landing gear comprises a connecting frame, a first cross arm, a second cross arm, a support arm, a drive assembly, a first rotating shaft and a second rotating shaft; the connecting frame is used to connect the UAV body; the first cross arm and the second cross arm are both connected to the connecting frame and are located below the connecting frame; the first cross arm and the second cross arm are parallel to each other; the two ends of the first rotating shaft are respectively rotatably passed through one end of the first cross arm and one end of the second cross arm; the two ends of the second rotating shaft are respectively rotatably passed through the other end of the first cross arm and the other end of the second cross arm; the first rotating shaft and the second rotating shaft are parallel to each other; the number of the support arms is 4; the two ends of the first rotating shaft are respectively fixed There is one support arm fixedly connected to it, and one support arm is fixedly connected to each end of the second rotating shaft; the two support arms connected to the first rotating shaft are parallel to each other; the two support arms connected to the second rotating shaft are parallel to each other; the driving component is arranged on the first cross arm; the driving component is used to drive the four support arms to rotate synchronously, so that the four support arms can be in the first state and the second state respectively; when the four support arms are in the first state, each support arm can support the drone body; when the four support arms are in the second state, two of the support arms are stored under the first cross arm, and the other two support arms are stored under the second cross arm.

[0006] Preferably, the first rotating shaft is perpendicular to the first cross arm; the interior of the first cross arm is hollow; the driving assembly includes a first worm wheel, a first worm and a motor; the first worm wheel is coaxially sleeved on the first rotating shaft, and the first worm wheel is inside the first cross arm; the first worm is rotatably arranged inside the first cross arm; the first worm wheel and the first worm are meshed; the first worm is parallel to the first cross arm; the motor is used to drive the first worm to rotate.

[0007] Preferably, the drive assembly also includes a second worm wheel and a second worm; the second worm wheel is coaxially sleeved on the second rotating shaft, and the second worm wheel is located inside the first cross arm; the second worm is rotatably arranged inside the first cross arm; the second worm wheel and the second worm are meshed; the second worm and the first worm share a common central axis; the motor is also used to drive the second worm to rotate.

[0008] Preferably, the drive assembly also includes a first gear, a second gear, a third rotating shaft and a battery; a protective cover is provided on the side of the middle part of the first cross arm away from the second cross arm; the motor is arranged in the protective cover; the first cross arm is provided with an interior connecting the first cross arm and the notch of the protective cover; the end of the first worm gear away from the first worm gear is coaxially connected to one end of the third rotating shaft, and the end of the second worm gear away from the second worm gear is coaxially connected to the other end of the third rotating shaft, and the lengths of the first worm gear and the second worm gear are the same; the first gear is coaxially sleeved on the third rotating shaft; the second gear is coaxially connected to the output shaft of the motor; the first gear and the second gear are meshed; the battery is arranged in the protective cover for powering the motor; the thread screwing direction of the first worm gear is opposite to the thread screwing direction of the second worm gear.

[0009] Preferably, the support arm includes a first arm, a second arm and a third arm connected in sequence; the second arm is located between the first arm and the third arm; the first arm is parallel to the third arm; the second arm is inclined relative to the first arm; wherein the first arms of two of the support arms are connected to the first rotating shaft, and the first arms of the other two support arms are connected to the second rotating shaft.

[0010] Preferably, it also includes a sleeve and a spring; the sleeve is slidably mounted on the third arm; the first arm is provided with a first inner cavity, the second arm is provided with a second inner cavity, and the third arm is provided with a third inner cavity; the first inner cavity, the second inner cavity and the third inner cavity are connected in sequence; one end of the spring is connected to the outer bottom wall of the third arm, and the other end of the spring is connected to the inner bottom wall of the sleeve; the spring is in a compressed state, and the elastic force of the spring causes the sleeve to tend to move away from the support arm; the outer bottom wall of the sleeve is provided with a rubber pad for contacting the ground.

[0011] Preferably, it also includes a sliding column, a support rod, a cable and a sheave; the sliding column is slidably embedded in the first inner cavity; the cross-section of the sliding column is circular; the cross-section of the first inner cavity is circular; the outer wall of the sliding column slides and fits against the inner wall of the first inner cavity; the sliding column includes a first end close to the second arm and a second end away from the second arm; the support rod is connected to the first end, and the support rod is in the first inner cavity; the support rod is parallel to the central axis of the sliding column; the sheave is rotatably arranged in the first inner cavity; the central axis of the sheave is perpendicular to the central axis of the sliding column; one end of the cable is connected to the support rod The cam is connected to the second end of the support rod by the spring, and the cam is connected to the first end of the support rod by the spring. The cam is connected to the second end of the support rod by the spring. The cam is connected to the second end of the support rod by the spring.

[0012] When the four support arms are in the first state, the sleeve is in the state farthest away from the first arm; when the four support arms are in the second state, the sliding column abuts against the arc-shaped block so that the sliding column is more embedded in the first inner cavity, so that the sleeve is in the state closest to the first arm.

[0013] Preferably, it also includes a first stop and a second stop; the first stop is connected to the support rod, and the second stop is connected to the inner wall of the first inner cavity; the second stop is farther away from the second arm than the first stop; the first stop and the second stop are on the side of the support rod away from the groove wheel; when the four support arms are in the first state, the first stop abuts against the second stop.

[0014] Preferably, it further comprises four connecting rods, two of which are connected between the connecting frame and the first transverse arm; and the other two connecting rods are connected between the connecting frame and the second transverse arm.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] The multi-rotor UAV landing gear proposed in the present invention can solve the problem that current multi-rotor UAVs mostly use fixed landing gear, the landing gear occupies a large space and is subjected to large air resistance during flight; when the UAV needs to take off and land, the driving component drives the four support arms to rotate downward synchronously so that the four support arms are all rotated to a vertical state. At this time, the four support arms are in the first state, so each support arm can support the UAV body; when the UAV is in flight, the driving component drives the four support arms to rotate upward synchronously so that the four support arms are all rotated to a horizontal state. At this time, the four support arms are in the second state, at this time, two support arms are stored under the first cross arm, and the other two support arms are stored under the second cross arm. In this way, the four support arms can be stored, reducing the space occupied by the UAV during flight, and thereby reducing the air resistance encountered during flight. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the multi-rotor UAV landing gear proposed by the present invention (first state);

[0019] Figure 2 This is a structural schematic diagram of an embodiment of the multi-rotor UAV landing gear proposed by the present invention (second state);

[0020] Figure 3 This is a partial top view of the structure of an embodiment of the multi-rotor UAV landing gear proposed by the present invention;

[0021] Figure 4 This is a schematic side cross-sectional structural diagram of the first cross arm of an embodiment of the multi-rotor UAV landing gear proposed by the present invention;

[0022] Figure 5 This is a schematic structural diagram of the support arm of an embodiment of the multi-rotor UAV landing gear proposed by the present invention in a first state;

[0023] Figure 6 This is a schematic structural diagram of the support arm of an embodiment of the multi-rotor UAV landing gear proposed in the present invention in the second state.

[0024] Description of reference numerals:

[0025] 110, UAV body; 120, connecting frame; 130, connecting rod; 140, first cross arm; 150, protective cover; 160, second cross arm; 170, support arm; 180, sleeve; 190, rubber pad; 210, arc stopper; 220, slide column; 230, first arm; 240, second arm; 250, third arm; 260, first inner cavity; 270, second inner cavity; 280, third inner cavity; 290, spring Spring; 310, cable; 320, first end; 330, second end; 340, support rod; 350, sheave; 360, first block; 370, second block; 380, first rotating shaft; 390, second rotating shaft; 410, first worm gear; 420, second worm gear; 430, first worm; 440, second worm; 450, third rotating shaft; 460, first gear; 470, first sleeve; 480, second sleeve.

[0026] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0030] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The present invention provides a multi-rotor UAV landing gear.

[0033] As attached Figure 1 -Attached Figure 6 As shown, in one embodiment of a multi-rotor UAV landing gear proposed by the present invention, the multi-rotor UAV landing gear includes a connecting frame 120, a first cross arm 140, a second cross arm 160, a support arm 170, a drive assembly, a first rotating shaft 380 and a second rotating shaft 390; the connecting frame 120 is used to connect the UAV body 110; the first cross arm 140 and the second cross arm 160 are both connected to the connecting frame 120 and are located below the connecting frame 120; the first cross arm 140 and the second cross arm are parallel to each other; the two ends of the first rotating shaft 380 are respectively rotatably passed through one end of the first cross arm 140 and one end of the second cross arm 160; the two ends of the second rotating shaft 390 are respectively rotatably passed through the other end of the first cross arm 140 and the other end of the second cross arm 160; the first rotating shaft 380 and the second rotating shaft 390 are parallel to each other; the support arm 170 The number is 4; one support arm 170 is fixedly connected to each end of the first rotating shaft 380, and one support arm 170 is fixedly connected to each end of the second rotating shaft 390; the two support arms 170 connected to the first rotating shaft 380 are parallel to each other; the two support arms 170 connected to the second rotating shaft 390 are parallel to each other; the driving assembly is arranged on the first cross arm 140; the driving assembly is used to drive the four support arms 170 to rotate synchronously so that the four support arms 170 can be in the first state and the second state respectively; when the four support arms 170 are in the first state, each support arm 170 can support the drone body 110; when the four support arms 170 are in the second state, two of the support arms 170 are stored under the first cross arm 140, and the other two support arms 170 are stored under the second cross arm 160.

[0034] The multi-rotor UAV landing gear proposed by the present invention can solve the problem that most current multi-rotor UAVs use fixed landing gear, which occupies a large space and is subjected to large air resistance during flight. When the UAV needs to take off and land, the driving assembly drives the four support arms 170 to rotate downward synchronously so that the four support arms 170 are all rotated to a vertical state. At this time, the four support arms 170 are in the first state, so that each support arm 170 can support the UAV body 110. When the UAV is in flight, the driving assembly drives the four support arms 170 to rotate upward synchronously so that the four support arms 170 are all rotated to a horizontal state. At this time, the four support arms 170 are in the second state. At this time, two support arms 170 are stored under the first cross arm 140, and the other two support arms 170 are stored under the second cross arm 160. In this way, the four support arms 170 can be stored, reducing the space occupied by the UAV during flight, thereby reducing the air resistance encountered during flight.

[0035] Specifically, as attached Figure 3 As shown, two of the support arms 170 are on the side of the first cross arm 140 away from the second cross arm 160; the other two support arms 170 are on the side of the second cross arm 160 away from the first cross arm 140; the two support arms 170 on the same side of the first cross arm 140 are symmetrical about the center point of the first cross arm 140; the two support arms 170 on the same side of the second cross arm 160 are symmetrical about the center point of the second cross arm 160; a first sleeve 470 and a second sleeve 480 are provided between the first cross arm 140 and the second cross arm 160; the first sleeve 470 is parallel to the second sleeve 480, and the first sleeve 470 is perpendicular to the first cross arm 140; the first rotating shaft 380 is passed through the first sleeve 470, and the second rotating shaft 390 is passed through the second sleeve 480.

[0036] In addition, the first rotating shaft 380 is perpendicular to the first cross arm 140 ; ​​the interior of the first cross arm 140 is hollow.

[0037] The drive assembly includes a first worm gear 410, a first worm 430 and a motor (not shown); the first worm gear 410 is coaxially sleeved on the first rotating shaft 380, and the first worm gear 410 is located inside the first cross arm 140; the first worm 430 is rotatably arranged inside the first cross arm 140; the first worm gear 410 and the first worm 430 are meshed; the first worm 430 is parallel to the first cross arm 140; the motor is used to drive the first worm 430 to rotate.

[0038] At the same time, the drive assembly also includes a second worm gear 420 and a second worm 440; the second worm gear 420 is coaxially sleeved on the second rotating shaft 390, and the second worm gear 420 is located inside the first cross arm 140; the second worm 440 is rotatably arranged inside the first cross arm 140; the second worm gear 420 and the second worm 440 are meshed; the second worm 440 and the first worm 430 share a central axis; the motor is also used to drive the second worm 440 to rotate.

[0039] In addition, as attached Figure 4 As shown, the drive assembly also includes a first gear 460, a second gear, a third rotating shaft 450 and a battery (not shown); a protective cover 150 is provided on the side of the middle part of the first cross arm 140 away from the second cross arm 160; the motor is arranged in the protective cover 150; the first cross arm 140 is provided with a gap connecting the interior of the first cross arm 140 and the protective cover 150; the end of the first worm 430 away from the first worm wheel 410 is coaxially connected to one end of the third rotating shaft 450, and the end of the second worm 440 away from the second worm wheel 420 is coaxially connected to the other end of the third rotating shaft 450, and the lengths of the first worm 430 and the second worm 440 are the same; the first gear 460 is coaxially sleeved on the third rotating shaft 450; the second gear is coaxially connected to the output shaft of the motor; the first gear 460 and the second gear are meshed; the battery is arranged in the protective cover 150 for powering the motor; the thread screwing direction of the first worm 430 is opposite to the thread screwing direction of the second worm 440.

[0040] Through the above technical solution, the structure and function of the driving assembly are further improved; the third rotating shaft 450 is driven by the motor, thereby driving the first worm 430 and the second worm 440 to rotate synchronously, thereby driving the first worm wheel 410 and the second worm wheel 420 to rotate synchronously and in opposite directions, thereby driving the four support arms 170 to rotate synchronously, so that the support arms 170 can respectively rotate to the first state (such as the attached state). Figure 1 as shown) and the second state (as shown in the attached Figure 2 shown).

[0041] In addition, as attached Figure 5 and attached Figure 6 As shown, the support arm 170 includes a first arm 230, a second arm 240 and a third arm 250 connected in sequence; the second arm 240 is located between the first arm 230 and the third arm 250; the first arm 230 is parallel to the third arm 250; the second arm 240 is tilted relative to the first arm 230; the first arms 230 of two of the support arms 170 are connected to the first rotating shaft 380, and the first arms 230 of the other two support arms 170 are connected to the second rotating shaft 390.

[0042] At the same time, the multi-rotor UAV landing gear also includes a sleeve 180 and a spring 290; the sleeve 180 is slidably mounted on the third arm 250; the first arm 230 is provided with a first inner cavity 260, the second arm 240 is provided with a second inner cavity 270, and the third arm 250 is provided with a third inner cavity 280; the first inner cavity 260, the second inner cavity 270 and the third inner cavity 280 are connected in sequence; one end of the spring 290 is connected to the outer bottom wall of the third arm 250, and the other end of the spring 290 is connected to the inner bottom wall of the sleeve 180; the spring 290 is in a compressed state, and the elastic force of the spring 290 makes the sleeve 180 tend to move away from the support arm 170; the outer bottom wall of the sleeve 180 is provided with a rubber pad 190 for abutting the ground.

[0043] In addition, the multi-rotor UAV landing gear also includes a sliding column 220, a support rod 340, a cable 310 and a sheave 350; the sliding column 220 is slidably embedded in the first inner cavity 260; the cross section of the sliding column 220 is circular; the cross section of the first inner cavity 260 is circular; the outer wall of the sliding column 220 slides and fits against the inner wall of the first inner cavity 260; the sliding column 220 includes a first end 320 close to the second arm 240 and a second end 330 away from the second arm 240; the support rod 340 is connected to the first end 320, and the support rod 340 is in the first inner cavity 260; the support rod 340 is parallel to the central axis of the sliding column 220; the sheave 350 is rotatably arranged in the first inner cavity 260; the central axis of the sheave 350 is perpendicular to the central axis of the sliding column 220; one end of the cable 310 The end is connected to the end of the support rod 340 away from the sliding column 220, and the other end of the cable 310 is wrapped around the sheave 350, and is successively passed through the first inner cavity 260, the second inner cavity 270 and the third inner cavity 280, and extends out of the third inner cavity 280, and finally connected to the inner bottom wall of the sleeve 180; the end of the support rod 340 close to the second arm 240 is closer to the second arm 240 than the sheave 350; the elastic force of the spring 290 straightens the cable 310 and makes the sliding column 220 tend to extend out of the first inner cavity 260; the second end 330 is configured to be rounded; an arc-shaped stopper 210 is provided at each end of the first cross arm 140, and an arc-shaped stopper 210 is provided at each end of the second cross arm 160; the arc surface of the arc stopper 210 faces the first arm 230.

[0044] When the four support arms 170 are in the first state, the sleeve 180 is in the state farthest away from the first arm 230; when the four support arms 170 are in the second state, the slide column 220 abuts against the arc-shaped block 210, so that the slide column 220 is more embedded in the first inner cavity 260, so that the sleeve 180 is in the state closest to the first arm 230.

[0045] Specifically, when the support arm 170 is in the first state, the sleeve 180 is in the state farthest away from the first arm 230 under the elastic force of the spring 290 (as shown in the attached Figure 5As shown in the figure), the overall length of the support arm 170 and the sleeve 180 is extended, which is convenient for better supporting the drone body 110. When the support arm 170 rotates to the storage position, the second end 330 contacts the arc-shaped stopper 210 and is finally pressed into the first inner cavity 260 by the arc-shaped stopper 210, so that the slide column 220 slides in the direction close to the second arm 240, thereby pulling the cable 310 to drive the sleeve 180 to slide in the direction close to the first arm 230, so as to shorten the overall length of the support arm 170 and the sleeve 180. Finally, when the support arm 170 is in a horizontal state (as shown in the figure), the second end 330 of the support arm 170 is in a horizontal state. Figure 6 As shown in FIG, the sleeve 180 is in a state closest to the first arm 230 for easy storage.

[0046] In addition, the multi-rotor UAV landing gear also includes a first stopper 360 and a second stopper 370; the first stopper 360 is connected to the support rod 340, and the second stopper 370 is connected to the inner wall of the first inner cavity 260; the second stopper 370 is farther away from the second arm 240 than the first stopper 360; the first stopper 360 and the second stopper 370 are located on the side of the support rod 340 away from the sheave 350; when the four support arms 170 are in the first state (as shown in the attached Figure 5 As shown, the first stopper 360 abuts against the second stopper 370 to prevent the sleeve 180 from separating from the third arm 250. The multi-rotor drone landing gear also includes four connecting rods 130; two connecting rods 130 are connected between the connecting frame 120 and the first cross arm 140; and the other two connecting rods 130 are connected between the connecting frame 120 and the second cross arm 160.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-rotor UAV landing gear, characterized in that: The cam is connected to the control stand by an interlocking arm and a coupling member, and the interlocking arm is connected to the control stand by an interlocking arm, wherein the interlocking arm is connected to the control stand by an interlocking arm. The driving assembly is arranged on the first cross arm; The driving assembly is used to drive the four support arms to rotate synchronously, so that the four support arms can be in a first state and a second state respectively; when the four support arms are in the first state, each support arm can support the drone body; When the four support arms are in the second state, two of the support arms are stored under the first cross arm, and the other two support arms are stored under the second cross arm; The support arm includes a first arm, a second arm and a third arm connected in sequence; the second arm is located between the first arm and the third arm; the first arm is parallel to the third arm; the second arm is arranged obliquely relative to the first arm; wherein the first arms of two of the support arms are connected to the first rotating shaft, and the first arms of the other two support arms are connected to the second rotating shaft; The support arm further comprises a sleeve and a spring; the sleeve is slidably mounted on the third arm; a first inner cavity is formed through the first arm, a second inner cavity is formed through the second arm, and a third inner cavity is formed through the third arm; the first inner cavity, the second inner cavity and the third inner cavity are sequentially connected; one end of the spring is connected to the outer bottom wall of the third arm, and the other end of the spring is connected to the inner bottom wall of the sleeve; the spring is in a compressed state, and the elastic force of the spring causes the sleeve to tend to move away from the support arm; the outer bottom wall of the sleeve is provided with a rubber pad for contacting the ground; The cam is connected to the first end of the support rod and the second end of the support rod is connected to the first end of the support rod, and the support rod is connected to the first end of the support rod, and the support rod is connected to the first end of the support rod. The cam is connected to the second end of the support rod by a spring, and the cam is connected to the first end of the support rod by a spring. The cam is connected to the second end of the support rod by a spring. The cam is connected to the second end of the support rod by a spring. The cam is connected to the second end of the support rod by a spring. When the four support arms are in the first state, the sleeve is in the state farthest away from the first arm; When the four support arms are in the second state, the sliding post abuts against the arc-shaped stopper, so that the sliding post is further embedded in the first inner cavity, so that the sleeve is in a state closest to the first arm.

2. A multi-rotor UAV landing gear according to claim 1, characterized in that: The first rotating shaft is perpendicular to the first cross arm; the interior of the first cross arm is hollow; the driving assembly includes a first worm gear, a first worm and a motor; the first worm gear is coaxially sleeved on the first rotating shaft, and the first worm gear is inside the first cross arm; the first worm gear is rotatably arranged inside the first cross arm; the first worm gear and the first worm gear are meshed; the first worm gear is parallel to the first cross arm; the motor is used to drive the first worm gear to rotate.

3. The multi-rotor UAV landing gear according to claim 2, characterized in that: The drive assembly also includes a second worm gear and a second worm; the second worm gear is coaxially sleeved on the second rotating shaft, and the second worm gear is located inside the first cross arm; the second worm gear is rotatably arranged inside the first cross arm; the second worm gear and the second worm gear are meshed; the second worm gear and the first worm gear share a central axis; the motor is also used to drive the second worm gear to rotate.

4. The multi-rotor UAV landing gear according to claim 3, characterized in that: The drive assembly also includes a first gear, a second gear, a third rotating shaft and a battery; a protective cover is provided on the side of the middle part of the first cross arm away from the second cross arm; the motor is arranged in the protective cover; the first cross arm is provided with an interior connected to the first cross arm and a gap in the protective cover; the end of the first worm gear away from the first worm wheel is coaxially connected to one end of the third rotating shaft, and the end of the second worm gear away from the second worm wheel is coaxially connected to the other end of the third rotating shaft, and the lengths of the first worm gear and the second worm gear are the same; the first gear is coaxially sleeved on the third rotating shaft; the second gear is coaxially connected to the output shaft of the motor; the first gear and the second gear are meshed; the battery is arranged in the protective cover for powering the motor; the thread screwing direction of the first worm gear is opposite to the thread screwing direction of the second worm gear.

5. The multi-rotor UAV landing gear according to claim 1, characterized in that: It also includes a first stopper and a second stopper; the first stopper is connected to the support rod, and the second stopper is connected to the inner wall of the first inner cavity; the second stopper is farther away from the second arm than the first stopper; the first stopper and the second stopper are on the side of the support rod away from the groove wheel; when the four support arms are in the first state, the first stopper abuts against the second stopper.

6. The multi-rotor UAV landing gear according to claim 1, characterized in that: It also includes four connecting rods; two of the connecting rods are connected between the connecting frame and the first cross arm; and the other two connecting rods are connected between the connecting frame and the second cross arm.

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