An aircraft with adjustable wing pitch

Abstract

The application relates to an aircraft with adjustable wing pitch, which comprises a main frame, left wings and right wings on both sides of the main frame, a hand adjusting device for controlling the reverse rotation of the left wings and the right wings, and an adjusting frame for controlling the same-direction rotation of the left wings and the right wings; the adjusting frame is installed on the main frame in a lifting manner, the hand adjusting device is installed on the adjusting frame and moves with the adjusting frame, symmetric left rotating shafts and right rotating shafts are arranged on the top of the main frame, the left rotating shafts and the right rotating shafts are fixedly connected with the left wings and the right wings respectively, and left cables and right cables are symmetrically wound on the left rotating shafts and the right rotating shafts; the hand adjusting device comprises an adjusting wheel; one end of each of the left cables and the right cables is fixedly connected with two tension springs arranged on the main frame, and the other end of each of the left cables and the right cables is connected with the adjusting wheel; the lifting of the adjusting frame cooperates with the tension springs to make the left cables and the right cables move in the same direction; and the rotation of the adjusting wheel cooperates with the tension springs to make the left cables and the right cables move reversely. The application has the characteristics of convenient adjustment, high adjustment precision and high stability.

Description

Technical Field

[0001] This application belongs to the field of frame-type aircraft technology, specifically relating to an aircraft with adjustable wing pitch angle. Background Technology

[0002] The glider adopts a closed frame structure formed by the left and right wings and left and right vertical beams. Compared with traditional aircraft, it has significant advantages such as high lift coefficient, strong flight stability and high space utilization. Therefore, it has broad application prospects in many fields such as low-altitude reconnaissance, material transportation, aerial photography and mapping, and disaster relief.

[0003] The pitch angle of an aircraft is a key parameter that affects the flight performance of an aircraft. Its adjustability directly determines the adaptability of the aircraft to different flight conditions: during takeoff, the pitch angle needs to be increased to quickly increase lift and shorten takeoff distance; during cruise, the pitch angle needs to be finely adjusted to reduce air resistance and improve endurance; when encountering complex flight environments such as turbulence, the pitch angle needs to be dynamically adjusted to maintain flight attitude stability.

[0004] Existing adjustable wing pitch and depression technology has many limitations: 1. Some solutions adjust the angle by replacing the adapter, such as Chinese patent CN111086622A, "An aircraft with variable wing pitch angle and its implementation method"; 2. Some monoplane aircraft use hydraulic or electric motors to drive the wing rotation, such as Chinese patent CN212861843U, "An aircraft with an adjustable wing angle".

[0005] Traditional solutions have significant shortcomings in practical applications: 1. The adapter solution requires manual replacement on the ground, which cannot dynamically adapt to flight conditions in real time, and the operation is cumbersome and requires stopping the aircraft for operation; 2. Hydraulic or electric drive solutions have poor adaptability and significantly increase weight. When directly applied to frame structures, they are prone to problems such as asynchronous adjustment and uneven stress on the uprights, which can lead to deformation or even instability of the frame structure. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, this application provides an aircraft with adjustable wing pitch angle, which features convenient adjustment, high adjustment accuracy, and high stability.

[0007] The purpose of this application is achieved as follows: an aircraft with adjustable wing pitch angle, characterized in that: it includes a main frame (12), a left wing (1) and a right wing (7) mounted on both sides of the main frame (12) and rotatable, a hand adjustment device (10) for controlling the left wing (1) and the right wing (7) to rotate in opposite directions, and an adjustment frame (13) for controlling the left wing (1) and the right wing (7) to rotate in the same direction. The adjustment frame (13) is mounted on the main frame (12) in a height-adjustable manner. The hand adjustment device (10) is mounted on the adjustment frame (13) and moves with the adjustment frame (13). The top of the main frame (12) is provided with symmetrical left turning shaft (2) and right turning shaft (6). The left turning shaft (2) and right turning shaft (6) are fixedly connected to the left wing (1) and right wing (7) respectively. The left cable (3) and right cable (5) are symmetrically wound around the left turning shaft (2) and right turning shaft (6). The hand adjustment device (10) includes an adjustment wheel (10-8); One end of the left cable (3) and the right cable (5) are fixedly connected to two tension springs (10-1) set at the main frame (12), and the other end is connected to the adjusting wheel (10-8); The lifting mechanism of the adjusting frame (13) and the tension spring (10-1) cause the left cable (3) and the right cable (5) to move in the same direction; The rotation of the adjusting wheel (10-8) and the tension spring (10-1) cause the left cable (3) and the right cable (5) to move in opposite directions.

[0008] The main frame (12) includes a top plate (12-5) and a bottom plate (12-4) arranged in parallel. Vertical rods (12-3) are symmetrically arranged between the top plate (12-5) and the bottom plate (12-4). An upper limit ring (12-1) and a lower limit ring (12-2) are fixed on the upper and lower parts of the two vertical rods (12-3), respectively. A tension spring seat (10-2) is fixed on the vertical rod (12-3) above the upper limit ring (12-1). The lower end of the tension spring (10-1) is fixedly connected to the tension spring seat (10-2), and the upper end of the tension spring (10-1) is fixedly connected to one end of the left cable (3) or the right cable (5). The two tension springs (10-1) are located on the left and right sides of the vertical rod (12-3) and are located on the same side in front of or behind the left rotating shaft (2) and the right rotating shaft (6).

[0009] The adjustment frame (13) includes a sleeve rod (13-1) that is sleeved outside the vertical rod (12-3) and located between the upper limit ring (12-1) and the lower limit ring (12-2). A pedal (13-2) is connected at the lower part between the two sleeve rods (13-1), and a hand adjustment device (10) is connected at the upper part between the two sleeve rods (13-1).

[0010] The hand adjustment device (10) includes a pull plate (10-3) connected between the sleeve rods (13-1). A handwheel shaft (10-7) is inserted in the middle of the pull plate (10-3). A handwheel (10-5) and an adjustment wheel (10-8) are fixedly connected to both ends of the handwheel shaft (10-7). Rotatable left guide wheel (10-6) and right guide wheel (10-4) are provided on the pull plates (10-3) on the left and right sides of the adjustment wheel (10-8). The other end of the left cable (3) is connected to the adjustment wheel (10-8) after passing through the left guide wheel (10-6). The other end of the right cable (5) is connected to the adjustment wheel (10-8) after passing through the right guide wheel (10-4). The adjustment wheel (10-8) is located behind or in front of the left rotating shaft (2) and the right rotating shaft (6).

[0011] The main frame (12) includes a top plate (12-5) and a bottom plate (12-4) arranged in parallel. A vertical rod (12-3) is provided between the top plate (12-5) and the bottom plate (12-4). A through groove (12-7) is provided on the vertical rod (12-3). A bushing is slidably connected in the groove (12-7). An upper limit ring (12-1) and a lower limit ring (12-2) are fixed on the upper and lower parts of the vertical rod (12-3), respectively. A tension spring seat (10-2) is fixed on the vertical rod (12-3) above the upper limit ring (12-1). The two sides of the tension spring seat (10-2) are fixedly connected to the lower ends of two tension springs (10-1), respectively. The upper ends of the two tension springs (10-1) are fixedly connected to one end of the left cable (3) and the right cable (5), respectively. Two tension springs (10-1) are located on the left and right sides of the vertical rod (12-3), and on the same side in front of or behind the left pivot (2) and right pivot (6).

[0012] The adjusting frame (13) includes a sleeve rod (13-1) sleeved outside the vertical rod (12-3) and located between the upper limit ring (12-1) and the lower limit ring (12-2). A pedal (13-2) is fixedly connected to the lower part of the sleeve rod (13-1). The two ends of the aforementioned bushing are fixedly connected to the inner wall of the sleeve rod (13-1). A hole is opened on the sleeve rod (13-1) at the connection point, and the hole communicates with the inside of the bushing. A rotatable handwheel is inserted into the bushing. Shaft (10-7), handwheel shaft (10-7) with holes at both ends, and fixedly connected to adjusting wheel (10-8) and handwheel (10-5) respectively. A bidirectional cable (10-9) is wound on adjusting wheel (10-8). The left and right ends of bidirectional cable (10-9) are fixedly connected to the other ends of left cable (3) and right cable (5) respectively. Bidirectional cable (10-9) is located behind or in front of left rotating shaft (2) and right rotating shaft (6).

[0013] Axles are installed on both sides of the base plate (12-4), and rotatable landing gear wheels (11) are installed on the axles. The outer ends of the two axles are connected to the bottom surfaces of the left wing (1) and the right wing (7) by main cables (9). The main cables (9) are connected to the bottom surfaces of the left wing (1) and the right wing (7) by vertical cables (8).

[0014] A limiting device is installed on the sleeve rod (13-1). A slot (12-6) is opened on the vertical rod (12-3) at the corresponding position of the limiting device. The limiting device includes a support base (13-5) fixed on the sleeve rod (13-1). Insertion holes are opened on the sleeve rod (13-1) on the upper and lower sides of the support base (13-5). The insertion holes are connected to the slot (12-6). A first button (13-3) and a second button (13-6) are respectively inserted into the insertion holes. A connecting rod (13-4) is hinged to the outer end of the support base (13-5). The two ends of the connecting rod (13-4) are respectively hinged to the outer ends of the first button (13-3) and the second button (13-6).

[0015] A limiting device is installed on the sleeve rod (13-1). A slot (12-6) is opened on the vertical rod (12-3) at the corresponding position of the limiting device. The limiting device includes a support base (13-5) fixed on the sleeve rod (13-1). Insertion holes are opened on the sleeve rod (13-1) on the upper and lower sides of the support base (13-5). The insertion holes are connected to the slot (12-6). A first button (13-3) and a second button (13-6) are respectively inserted into the insertion holes. A connecting rod (13-4) is hinged to the outer end of the support base (13-5). The two ends of the connecting rod (13-4) are respectively hinged to the outer ends of the first button (13-3) and the second button (13-6).

[0016] Limiting plates are fixed to the outside of the first button (13-3) and the second button (13-6), and pressure plates are sleeved on the inside of the limiting plates. Springs are sleeved on the first button (13-3) and the second button (13-6) between the pressure plates and the limiting plates.

[0017] By implementing the above technical solution, the beneficial effects of this application compared with the prior art are: 1. Abandoning the traditional "replacing adapters" shutdown adjustment mode, it adopts a linkage structure of adjustment frame, left pull cable, right pull cable and hand adjustment device. Pilots can control the wing pitch angle in real time during flight without stopping the aircraft. It can quickly adapt to different flight conditions (increasing the pitch angle to increase lift during takeoff, fine-tuning to reduce drag during cruise, and dynamically stabilizing attitude in turbulence). 2. The foot pedal operation is intuitive and labor-saving. Combined with the precise transmission of the cable, the adjustment response is rapid. There is no need for a complicated electronic or hydraulic system, which lowers the operating threshold. 3. The hand adjustment device can rotate the left and right wings in opposite directions synchronously, avoiding the problems of "unsynchronized adjustment and uneven force on the upright beam" in the traditional hydraulic / electric drive scheme, effectively preventing the frame structure from deforming or becoming unstable, and improving flight safety; 4. The bearing housing, main cable, and vertical cable provide stable support for the left wing, right wing, left pivot, and right pivot, reducing vibration of the left and right wings and ensuring stable flight attitude. Attached Figure Description

[0018] The specific structure of this application is given by the following figures and embodiments: Figure 1 This is a structural diagram of the present application when the main frame is a frame structure; Figure 2 This is a schematic diagram of the connection structure of the main frame, adjustment frame, and hand adjustment device in Embodiment 1; Figure 3 This is a schematic diagram of the linkage structure between the handwheel, adjusting wheel, left guide wheel, right guide wheel and left rotating shaft and right rotating shaft in Embodiment 1; Figure 4 These are schematic diagrams of the connection structure between the left rotating shaft, the right rotating shaft, and the bearing housing in Examples 1 and 2. Figure 5 This is a schematic diagram of the connection structure between the limiting device and the vertical rod and sleeve rod in Examples 1 and 2; Figure 6 This is a schematic diagram of the structure in Example 1 where the left and right cables are directly connected to the adjusting wheel; Figure 7 This is a schematic diagram of the structure in Example 1 where the left and right cables are not connected and are wound around the adjusting wheel; Figure 8 This is a schematic diagram of the structure in Example 1 where the left and right cables are connected and wound around the adjusting wheel; Figure 9 This is a structural diagram of the present application when the main frame is a T-shaped structure; Figure 10 This is a schematic diagram of the connection structure of the main frame, adjustment frame, and hand adjustment device in Embodiment 2; Figure 11 This is a schematic diagram of the linkage structure between the handwheel, adjusting wheel, left rotating shaft, and right rotating shaft in Embodiment 2; Figure 12 This is a schematic diagram of the connection structure between the hand adjustment device and the vertical rod and sleeve rod in Embodiment 2.

[0019] 1. Left wing, 2. Left pivot, 3. Left cable, 4. Bearing housing, 4-1. Outer bearing, 4-2. Bushing, 4-3. Housing, 4-4. Pressure bearing, 5. Right cable, 6. Right pivot, 7. Right wing, 8. Vertical cable, 9. Main cable, 10. Hand adjustment device, 10-1. Tension spring, 10-2. Tension spring seat, 10-3. Pull plate, 10-4. Right guide wheel, 10-5. Handwheel, 10-6. Left guide wheel, 10-7. Handwheel shaft, 10-8. Adjusting wheel, 10-81. Wheel, 10-82. Wheel groove, 10-9. Bidirectional cable, 11. Landing wheel, 12. Main frame, 12-1. Upper limit ring, 12-2. Lower limit ring, 12-3. Vertical rod, 12-4. Base plate, 12-5. Top plate, 12-6. Slot, 12-7. Slide groove, 13. Adjustment frame, 13-1. Sleeve rod, 13-2. Pedal, 13-3. First button, 13-4. Connecting rod, 13-5. Support seat, 13-6. Second button. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Example: Figure 1-8 As shown, an aircraft with adjustable wing pitch angle includes a main frame (12), a rotatable left wing (1) and right wing (7) mounted on both sides of the main frame (12), a hand adjustment device (10) for controlling the left wing (1) and right wing (7) to rotate in opposite directions, and an adjustment frame (13) for controlling the left wing (1) and right wing (7) to rotate in the same direction. The adjustment frame (13) is mounted on the main frame (12) in a height-adjustable manner. The hand adjustment device (10) is mounted on the adjustment frame (13) and moves with the adjustment frame (13). The top of the main frame (12) is provided with symmetrical left turning shaft (2) and right turning shaft (6). The left turning shaft (2) and right turning shaft (6) are fixedly connected to the left wing (1) and right wing (7) respectively. The left cable (3) and right cable (5) are symmetrically wound around the left turning shaft (2) and right turning shaft (6). The hand adjustment device (10) includes an adjustment wheel (10-8); One end of the left cable (3) and the right cable (5) are fixedly connected to two tension springs (10-1) set at the main frame (12), and the other end is connected to the adjusting wheel (10-8); The lifting mechanism of the adjusting frame (13) and the tension spring (10-1) cause the left cable (3) and the right cable (5) to move in the same direction; The rotation of the adjusting wheel (10-8) and the tension spring (10-1) cause the left cable (3) and the right cable (5) to move in opposite directions.

[0023] Example 1: Further, such as Figure 1 , 2 As shown, the main frame (12) includes a top plate (12-5) and a bottom plate (12-4) arranged parallel to each other. Vertical rods (12-3) are symmetrically arranged between the top plate (12-5) and the bottom plate (12-4). An upper limit ring (12-1) and a lower limit ring (12-2) are fixed to the upper and lower parts of the two vertical rods (12-3), respectively. A tension spring seat (10-2) is fixed on the vertical rod (12-3) above the upper limit ring (12-1). The lower end of the tension spring (10-1) is fixedly connected to the tension spring seat (10-2), and the upper end of the tension spring (10-1) is fixedly connected to one end of the left cable (3) or the right cable (5). The two tension springs (10-1) are located on the left and right sides of the vertical rod (12-3) and are located on the same side in front of or behind the left rotating shaft (2) and the right rotating shaft (6).

[0024] Furthermore, such as Figure 1 , 2 As shown, the adjustment frame (13) includes a sleeve rod (13-1) that is respectively sleeved outside the vertical rod (12-3) and located between the upper limit ring (12-1) and the lower limit ring (12-2). A pedal (13-2) is connected at the lower part between the two sleeve rods (13-1), and a hand adjustment device (10) is connected at the upper part between the two sleeve rods (13-1).

[0025] Furthermore, such as Figure 1 , 2As shown in Figure 3, the hand adjustment device (10) includes a pull plate (10-3) connected between the sleeve rods (13-1). A handwheel shaft (10-7) is inserted into the middle of the pull plate (10-3). A handwheel (10-5) and an adjustment wheel (10-8) are fixedly connected to both ends of the handwheel shaft (10-7). Rotatable left guide wheel (10-6) and right guide wheel (10-4) are provided on the pull plates (10-3) on the left and right sides of the adjustment wheel (10-8). The other end of the left cable (3) is connected to the adjustment wheel (10-8) after passing through the left guide wheel (10-6), and the other end of the right cable (5) is connected to the adjustment wheel (10-8) after passing through the right guide wheel (10-4). The adjustment wheel (10-8) is located behind or in front of the left rotating shaft (2) and the right rotating shaft (6). For example, when the tension spring (10-1) is located behind the left pivot (2) and the right pivot (6), the adjusting wheel (10-8) is located in front of the left pivot (2) and the right pivot (6).

[0026] Furthermore, such as Figure 6 As shown, the adjusting wheel (10-8) includes two discs (10-81) on both sides, and a groove (10-82) is provided between the two discs (10-81). The other ends of the left cable (3) and the right cable (5) are directly fixedly connected to the same side of the groove (10-82) after passing through the left guide wheel (10-6) and the right guide wheel (10-4) respectively. In this case, the left cable (3) and the right cable (5) are two independent cables.

[0027] Furthermore, such as Figure 7 As shown, the adjusting wheel (10-8) includes two discs (10-81) on both sides, and a groove (10-82) is provided between the two discs (10-81). The other ends of the left cable (3) and the right cable (5) are respectively wound around the groove (10-82) after passing through the left guide wheel (10-6) and the right guide wheel (10-4), and then fixed. The left cable (3) and the right cable (5) are wound in opposite directions on the groove (10-82). In this case, the left cable (3) and the right cable (5) are two independent cables.

[0028] Furthermore, such as Figure 8As shown, the adjusting wheel (10-8) includes two discs (10-81) on both sides, and a groove (10-82) is provided between the two discs (10-81). The other end of the left cable (3) passes through the left guide wheel (10-6) and is wound around the groove (10-82) and then fixedly connected to the right cable (5). In this case, the left cable (3) and the right cable (5) are connected as a single cable. Specifically, one end of the cable is fixedly connected to the upper end of the tension spring (10-1) on the left side, and the other end extends upward to the left rotating shaft (2). Starting from the rear side of the left rotating shaft (2), it spirals around the left rotating shaft (2) to the right for several turns, and then extends downward from the front side of the left rotating shaft (2) to the adjusting wheel (10-8). After spiraling around the adjusting wheel (10-8) for several turns, it extends upward to the right rotating shaft (6). Starting from the front side of the right rotating shaft (6), it spirals around the right rotating shaft (6) to the right for several turns, and then extends downward from the rear side of the right rotating shaft (6) to the upper end of the tension spring (10-1) on the right side for fixed connection.

[0029] Before flight, depending on the operator's weight, the height of the tension spring seat (10-2) on the vertical rod (12-3) needs to be adjusted upwards or downwards and fixed to change the tension of the tension spring (10-1) on the left cable (3) and right cable (5), so that the pitch angle of the left wing (1) and right wing (7) is no greater than 45° when unloaded. The tension spring seat (10-2) and the vertical rod (12-3) can be fixed in the following way: the bottom end of the tension spring seat (10-2) is integrally connected to a limit plate and a plug rod is inserted. Several adjustment holes are arranged vertically on the vertical rod (12-3) on the upper and lower sides of the tension spring seat (10-2). The position of the tension spring seat (10-2) can be changed by inserting the plug rod into different adjustment holes. External threads are opened on both sides of the plug rod and positioning nuts are screwed on. This fixing method is existing technology and is not shown in the figure. The spring seat (10-2) and the vertical rod (12-3) can also be fixed by a structure that is applicable to this application in the prior art. This is not the point of invention of this application, and the specific structure will not be described in detail here.

[0030] During flight, the operator stands or squats on the footboard (13-2) without moving. The footboard (13-2) is subjected to downward force, which drives the adjustment frame (13) to descend as a whole. At this time, the hand adjustment device (10) moves downward accordingly. The hand adjustment device (10) will pull the left cable (3) and right cable (5) on the corresponding side to move downward at the same time. This causes the left cable (3) and right cable (5) to drive the left pivot (2) and right pivot (6) to rotate forward (in terms of pitch) at the same time. The pitch angle of the left wing (1) and right wing (7) decreases, which is suitable for gliding attitude. At this time, the tension spring (10-1) is stretched.

[0031] When the operator quickly squats down from a standing position, they will be in a state of weightlessness. The force on the pedal (13-2) will decrease instantly, and the tension spring (10-1) will retract, thereby pulling the left cable (3) and right cable (5) on the corresponding side to move downwards simultaneously. This causes the left cable (3) and right cable (5) to drive the left pivot (2) and right pivot (6) to rotate backwards (with an upward angle tendency). The upward angle of the left wing (1) and right wing (7) increases, which is suitable for the climbing posture, allowing the left wing (1) and right wing (7) to gain potential energy. Conversely, when the operator quickly stands up from a squatting position, they will be in a state of weightlessness. The left pivot (2) and right pivot (6) will rotate forward (with a downward angle tendency). The upward angle of the left wing (1) and right wing (7) decreases, which is suitable for the diving posture, allowing the left wing (1) and right wing (7) to gain acceleration kinetic energy.

[0032] During flight, the pitch angles of the left wing (1) and right wing (7) can be adjusted by the hand adjustment device (10). The specific operation is as follows: turn the handwheel (10-5) clockwise, and the adjustment wheel (10-8) will turn clockwise at the same time. The right cable (5) will move towards the corresponding tension spring (10-1) as the adjustment wheel (10-8) rotates. The tension spring (10-1) will contract and pull the right cable (5), causing the right pivot (6) to rotate backward (pitch angle trend), and the pitch angle of the right wing (7) will increase.

[0033] At this time, the left cable (3) moves in the opposite direction to the corresponding tension spring (10-1) as the adjusting wheel (10-8) rotates, causing the left pivot (2) to rotate forward (pitch angle trend), the pitch angle of the left wing (1) decreases, and the tension spring (10-1) corresponding to the left cable (3) is stretched.

[0034] Similarly, when the handwheel (10-5) is turned counterclockwise, the right pivot (6) rotates forward (in terms of pitch), and the right wing (7) pitch angle decreases. The left pivot (2) rotates backward (in terms of pitch), and the left wing (1) pitch angle increases.

[0035] This application controls the opposite changes in the pitch angles of the left wing (1) and the right wing (7) through a hand adjustment device (10), thereby adjusting the overall lateral flight attitude and achieving the purpose of yaw control.

[0036] Furthermore, the left cable (3) and right cable (5) can rotate the left shaft (2) and right shaft (6) by means of friction. In order to enhance reliability, the middle section of the winding part of the left cable (3) and right cable (5) can be fixedly connected to the left shaft (2) and right shaft (6) respectively, so as to ensure that as long as the left cable (3) and right cable (5) move, the left shaft (2) and right shaft (6) will rotate.

[0037] like Figure 4As shown, a bearing seat (4) is provided at the center of the top of the top plate (12-5). The bearing seat (4) includes a hollow housing (4-3). The left and right end faces of the housing (4-3) are respectively provided with shaft holes for the left rotating shaft (2) and the right rotating shaft (6) to extend into. An outer bearing (4-1) is provided in the shaft hole. The inner ends of the left rotating shaft (2) and the right rotating shaft (6) are respectively connected to two pressure bearings (4-4). The pressure bearings (4-4) are connected to the housing (4-3). A bushing (4-2) is sleeved on the left rotating shaft (2) and the right rotating shaft (6) between the outer bearing (4-1) and the pressure bearing (4-4). The aforementioned outer bearing (4-1), pressure bearing (4-4), and bushing (4-2) are all prior art and are not the inventive point of this application, and will not be described in detail here.

[0038] Furthermore, such as Figure 1 As shown, axles are installed on both sides of the base plate (12-4), and rotatable landing gear wheels (11) are installed on the axles. The outer ends of the two axles are connected to the bottom surfaces of the left wing (1) and the right wing (7) by main cables (9). The main cables (9) are connected to the bottom surfaces of the left wing (1) and the right wing (7) by vertical cables (8).

[0039] The bearing housing (4), main cable (9), and vertical cable (8) provide stable support for the left wing (1), right wing (7), left pivot (2), and right pivot (6), reducing the vibration of the left wing (1) and right wing (7).

[0040] like Figure 5 As shown, a limiting device is installed on the sleeve rod (13-1), and a slot (12-6) is opened on the vertical rod (12-3) at the corresponding position of the limiting device. The limiting device includes a support base (13-5) fixed on the sleeve rod (13-1). Insertion holes are opened on the sleeve rod (13-1) on the upper and lower sides of the support base (13-5). The insertion holes are connected to the slot (12-6). A first button (13-3) and a second button (13-6) are respectively inserted into the insertion holes. A connecting rod (13-4) is hinged to the outer end of the support base (13-5). The two ends of the connecting rod (13-4) are respectively hinged to the outer ends of the first button (13-3) and the second button (13-6).

[0041] Furthermore, a limiting piece is fixed to the outside of the first button (13-3) and the second button (13-6), and a pressure plate is sleeved on the inside of the limiting piece. A spring is sleeved on the first button (13-3) and the second button (13-6) between the pressure plate and the limiting piece. Both the limiting piece and the pressure plate are located outside the socket.

[0042] By pressing the first button (13-3) or the second button (13-6), the inner end of the first button (13-3) or the second button (13-6) enters the slot (12-6), thereby limiting the downward stroke of the sleeve rod (13-1) when the sleeve rod (13-1) moves downward, and thus limiting the angle of the left rotation axis (2) and the right rotation axis (6) to rotate forward (pitch angle trend), and finally limiting the minimum pitch angle of the left wing (1) and the right wing (7) to not be less than -15°, so as to meet the needs of different situations (for example, when encountering downdrafts, it can prevent excessive loss of altitude).

[0043] The first button (13-3) is located above the second button (13-6). When neither the first button (13-3) nor the second button (13-6) enters the slot (12-6), the travel of the lever (13-1) is determined by the difference between the distance between the upper limit ring (12-1) and the lower limit ring (12-2) and the length of the lever (13-1). At this time, the left wing (1) and the right wing (7) can reach the maximum pitch angle.

[0044] When the upper end of the sleeve (13-1) touches the upper limit ring (12-1), let the vertical distance from the first button (13-3) to the bottom of the slot (12-6) be L1, and the vertical distance from the second button (13-6) to the bottom of the slot (12-6) be L2. Then, when the first button (13-3) or the second button (13-6) enters the slot (12-6), the stroke of the sleeve (13-1) will be L1 or L2.

[0045] Furthermore, the length (height) of the slot (12-6) is much greater than the distance between the first button (13-3) and the second button (13-6).

[0046] The diameter of the socket is larger than the maximum diameter of the first button (13-3) and the second button (13-6), so as not to affect the movement of the first button (13-3) and the second button (13-6) in and out of the socket.

[0047] Example 2: Further, such as Figure 9 , 10As shown, the main frame (12) includes a top plate (12-5) and a bottom plate (12-4) arranged in parallel. A vertical rod (12-3) is arranged between the top plate (12-5) and the bottom plate (12-4). A through groove (12-7) is opened on the vertical rod (12-3). A bushing is slidably connected in the groove (12-7). An upper limit ring (12-1) and a lower limit ring (12-2) are fixed on the upper and lower parts of the vertical rod (12-3), respectively. A tension spring seat (10-2) is fixed on the vertical rod (12-3) above the upper limit ring (12-1). The two sides of the tension spring seat (10-2) are fixedly connected to the lower ends of two tension springs (10-1), respectively. The upper ends of the two tension springs (10-1) are fixedly connected to one end of the left cable (3) and the right cable (5), respectively. Two tension springs (10-1) are located on the left and right sides of the vertical rod (12-3), and on the same side in front of or behind the left pivot (2) and right pivot (6).

[0048] Furthermore, such as Figure 9 , 10 As shown in 11 and 12, the adjusting frame (13) includes a sleeve rod (13-1) sleeved outside the vertical rod (12-3) and located between the upper limit ring (12-1) and the lower limit ring (12-2). A pedal (13-2) is fixedly connected to the lower part of the sleeve rod (13-1). The two ends of the aforementioned bushing are fixedly connected to the inner wall of the sleeve rod (13-1). A hole is opened on the sleeve rod (13-1) at the connection point, and the hole is connected to the bushing. A rotatable handwheel shaft (10-7) is inserted into the bushing. The two ends of the handwheel shaft (10-7) extend out of the hole and are fixedly connected to the adjusting wheel (10-8) and the handwheel (10-5) respectively. A bidirectional cable (10-9) is wound on the adjusting wheel (10-8). The left and right ends of the bidirectional cable (10-9) are fixedly connected to the other ends of the left cable (3) and the right cable (5) respectively. The bidirectional cable (10-9) is located behind or in front of the left pivot (2) and right pivot (6). For example, when the tension spring (10-1) is located behind the left pivot (2) and right pivot (6), the bidirectional cable (10-9) is located in front of the left pivot (2) and right pivot (6).

[0049] like Figure 11 As shown, the left cable (3), right cable (5) and bidirectional cable (10-9) can also be a single cable. One end of the cable is fixedly connected to the upper end of the tension spring (10-1) on the left side, and the other end extends upward to the left pivot (2). Starting from the rear side of the left pivot (2), it spirals forward and to the right along the left pivot (2) for several turns, and then extends downward from the front side of the left pivot (2) to the adjusting wheel (10-8). After spiraling around the adjusting wheel (10-8) for several turns, it extends upward to the right pivot (6). Starting from the front side of the right pivot (6), it spirals backward and to the right along the right pivot (6) for several turns, and then extends downward from the rear side of the right pivot (6) to the upper end of the tension spring (10-1) on the right side for a fixed connection.

[0050] During flight, the pitch angles of the left wing (1) and right wing (7) can be adjusted by adjusting the wheel (10-8). The specific operation is as follows: Turn the handwheel (10-5) clockwise, and the adjusting wheel (10-8) will also turn clockwise at the same time. The right side of the bidirectional cable (10-9) will move downward, pulling the right cable (5) to move, which will drive the right pivot (6) to rotate forward (pitch angle trend). The pitch angle of the right wing (7) will decrease. At this time, the tension on the right tension spring (10-1) will increase and be stretched.

[0051] At this time, the left side of the bidirectional cable (10-9) moves upward, the tension on the left tension spring (10-1) decreases and retracts, pulling the left cable (3) to move, causing the left pivot (2) to rotate backward (elevation trend), and the elevation angle of the left wing (1) increases.

[0052] Similarly, when the handwheel (10-5) is turned counterclockwise, the right pivot (6) rotates backward (in terms of elevation angle), the elevation angle of the right wing (7) increases, the left pivot (2) rotates forward (in terms of depression angle), and the elevation angle of the left wing (1) decreases.

[0053] In Embodiment 2, the connection structure between the left rotating shaft (2), the right rotating shaft (6), and the bearing housing (4) is the same as in Embodiment 1. Transition bushings for protecting the left rotating shaft (2) and the right rotating shaft (6) are also provided on the top plates (12-5) on both sides of the bearing housing (4). The aforementioned outer bearing (4-1), pressure bearing (4-4), bushing (4-2), and transition bushing are all prior art, and their specific structures are not the focus of this invention; therefore, they will not be described in detail here.

[0054] In Example 2, the connection structure of the base plate (12-4), landing gear wheel (11), left wing (1), right wing (7), main cable (9), and vertical cable (10) is the same as in Example 1, and will not be described again.

[0055] In Example 2, as Figure 12 As shown, a limiting device is installed on the sleeve rod (13-1), and a slot (12-6) is opened on the vertical rod (12-3) at the corresponding position of the limiting device. The slot (12-6) is located on the upper side of the slide groove (12-7). The structure of the limiting device is the same as that in Embodiment 1.

[0056] All other contents not described in Example 2 are the same as in Example 1.

[0057] The above description is merely an example for clearly illustrating this application and is not intended to limit the implementation of this application. Any obvious variations or modifications derived from the technical solutions of this application are still within the protection scope of this application.

Claims

1. An aircraft with adjustable wing pitch angle, characterized in that: Includes a main frame (12), a rotatable left wing (1) and right wing (7) installed on both sides of the main frame (12), a hand adjustment device (10) for controlling the left wing (1) and right wing (7) to rotate in opposite directions, and an adjustment frame (13) for controlling the left wing (1) and right wing (7) to rotate in the same direction. The adjustment frame (13) is mounted on the main frame (12) in a height-adjustable manner. The hand adjustment device (10) is mounted on the adjustment frame (13) and moves with the adjustment frame (13). The top of the main frame (12) is provided with symmetrical left turning shaft (2) and right turning shaft (6). The left turning shaft (2) and right turning shaft (6) are fixedly connected to the left wing (1) and right wing (7) respectively. The left cable (3) and right cable (5) are symmetrically wound around the left turning shaft (2) and right turning shaft (6). The hand adjustment device (10) includes an adjustment wheel (10-8); One end of the left cable (3) and the right cable (5) are fixedly connected to two tension springs (10-1) set at the main frame (12), and the other end is connected to the adjusting wheel (10-8); The lifting mechanism of the adjusting frame (13) and the tension spring (10-1) cause the left cable (3) and the right cable (5) to move in the same direction; The rotation of the adjusting wheel (10-8) and the tension spring (10-1) cause the left cable (3) and the right cable (5) to move in opposite directions.

2. The aircraft with adjustable wing pitch angle as described in claim 1, characterized in that: The main frame (12) includes a top plate (12-5) and a bottom plate (12-4) arranged in parallel. Vertical rods (12-3) are symmetrically arranged between the top plate (12-5) and the bottom plate (12-4). An upper limit ring (12-1) and a lower limit ring (12-2) are fixed on the upper and lower parts of the two vertical rods (12-3), respectively. A tension spring seat (10-2) is fixed on the vertical rod (12-3) above the upper limit ring (12-1). The lower end of the tension spring (10-1) is fixedly connected to the tension spring seat (10-2), and the upper end of the tension spring (10-1) is fixedly connected to one end of the left cable (3) or the right cable (5). The two tension springs (10-1) are located on the left and right sides of the vertical rod (12-3) and are located on the same side in front of or behind the left rotating shaft (2) and the right rotating shaft (6).

3. An aircraft with adjustable wing pitch angle as described in claim 2, characterized in that: The adjustment frame (13) includes a sleeve rod (13-1) that is sleeved outside the vertical rod (12-3) and located between the upper limit ring (12-1) and the lower limit ring (12-2). A pedal (13-2) is connected at the lower part between the two sleeve rods (13-1), and a hand adjustment device (10) is connected at the upper part between the two sleeve rods (13-1).

4. An aircraft with adjustable wing pitch angle as described in claim 3, characterized in that: The hand adjustment device (10) includes a pull plate (10-3) connected between the sleeve rods (13-1). A handwheel shaft (10-7) is inserted in the middle of the pull plate (10-3). A handwheel (10-5) and an adjustment wheel (10-8) are fixedly connected to both ends of the handwheel shaft (10-7). Rotatable left guide wheel (10-6) and right guide wheel (10-4) are provided on the pull plates (10-3) on the left and right sides of the adjustment wheel (10-8). The other end of the left cable (3) is connected to the adjustment wheel (10-8) after passing through the left guide wheel (10-6). The other end of the right cable (5) is connected to the adjustment wheel (10-8) after passing through the right guide wheel (10-4). The adjustment wheel (10-8) is located behind or in front of the left rotating shaft (2) and the right rotating shaft (6).

5. An aircraft with adjustable wing pitch angle as described in claim 1, characterized in that: The main frame (12) includes a top plate (12-5) and a bottom plate (12-4) arranged in parallel. A vertical rod (12-3) is provided between the top plate (12-5) and the bottom plate (12-4). A through groove (12-7) is provided on the vertical rod (12-3). A bushing is slidably connected in the groove (12-7). An upper limit ring (12-1) and a lower limit ring (12-2) are fixed on the upper and lower parts of the vertical rod (12-3), respectively. A tension spring seat (10-2) is fixed on the vertical rod (12-3) above the upper limit ring (12-1). The two sides of the tension spring seat (10-2) are fixedly connected to the lower ends of two tension springs (10-1), respectively. The upper ends of the two tension springs (10-1) are fixedly connected to one end of the left cable (3) and the right cable (5), respectively. Two tension springs (10-1) are located on the left and right sides of the vertical rod (12-3), and on the same side in front of or behind the left pivot (2) and right pivot (6).

6. An aircraft with adjustable wing pitch angle as described in claim 5, characterized in that: The adjusting frame (13) includes a sleeve rod (13-1) sleeved outside the vertical rod (12-3) and located between the upper limit ring (12-1) and the lower limit ring (12-2). A pedal (13-2) is fixedly connected to the lower part of the sleeve rod (13-1). The two ends of the aforementioned bushing are fixedly connected to the inner wall of the sleeve rod (13-1). A hole is opened on the sleeve rod (13-1) at the connection point, and the hole communicates with the inside of the bushing. A rotatable handwheel is inserted into the bushing. Shaft (10-7), handwheel shaft (10-7) with holes at both ends, and fixedly connected to adjusting wheel (10-8) and handwheel (10-5) respectively. A bidirectional cable (10-9) is wound on adjusting wheel (10-8). The left and right ends of bidirectional cable (10-9) are fixedly connected to the other ends of left cable (3) and right cable (5) respectively. Bidirectional cable (10-9) is located behind or in front of left rotating shaft (2) and right rotating shaft (6).

7. An aircraft with adjustable wing pitch angle as described in any one of claims 1-6, characterized in that: Axles are installed on both sides of the base plate (12-4), and rotatable landing gear wheels (11) are installed on the axles. The outer ends of the two axles are connected to the bottom surfaces of the left wing (1) and the right wing (7) by main cables (9). The main cables (9) are connected to the bottom surfaces of the left wing (1) and the right wing (7) by vertical cables (8).

8. An aircraft with adjustable wing pitch angle as described in any one of claims 1-6, characterized in that: A limiting device is installed on the sleeve rod (13-1). A slot (12-6) is opened on the vertical rod (12-3) at the corresponding position of the limiting device. The limiting device includes a support base (13-5) fixed on the sleeve rod (13-1). Insertion holes are opened on the sleeve rod (13-1) on the upper and lower sides of the support base (13-5). The insertion holes are connected to the slot (12-6). A first button (13-3) and a second button (13-6) are respectively inserted into the insertion holes. A connecting rod (13-4) is hinged to the outer end of the support base (13-5). The two ends of the connecting rod (13-4) are respectively hinged to the outer ends of the first button (13-3) and the second button (13-6).

9. An aircraft with adjustable wing pitch angle as described in claim 7, characterized in that: A limiting device is installed on the sleeve rod (13-1). A slot (12-6) is opened on the vertical rod (12-3) at the corresponding position of the limiting device. The limiting device includes a support base (13-5) fixed on the sleeve rod (13-1). Insertion holes are opened on the sleeve rod (13-1) on the upper and lower sides of the support base (13-5). The insertion holes are connected to the slot (12-6). A first button (13-3) and a second button (13-6) are respectively inserted into the insertion holes. A connecting rod (13-4) is hinged to the outer end of the support base (13-5). The two ends of the connecting rod (13-4) are respectively hinged to the outer ends of the first button (13-3) and the second button (13-6).

10. An aircraft with adjustable wing pitch angle as described in claim 8, characterized in that: Limiting plates are fixed to the outside of the first button (13-3) and the second button (13-6), and pressure plates are sleeved on the inside of the limiting plates. Springs are sleeved on the first button (13-3) and the second button (13-6) between the pressure plates and the limiting plates.

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