A folding propeller structure for a rotary-wing drone

Abstract

This utility model discloses a folding propeller structure for a rotary-wing unmanned aerial vehicle (UAV), including an upper clamping plate, a lower clamping plate, a first propeller blade, a second propeller blade, a first rotating shaft, and a second rotating shaft. The upper and lower clamping plates are vertically opposite each other. A first gasket is installed on the lower side of one end of the upper clamping plate, and a second gasket is installed on the upper side of one end of the lower clamping plate. The upper end of the first rotating shaft passes through the first gasket and connects to one end of the upper clamping plate, while the lower end of the first rotating shaft passes through the second gasket and connects to one end of the lower clamping plate. One end of the first propeller blade is located between one end of the upper and lower clamping plates and is rotatably mounted outside the first rotating shaft. A third gasket is installed on the lower side of the other end of the upper clamping plate, and a fourth gasket is installed on the upper side of the other end of the lower clamping plate. One end of the second propeller blade is located between the other ends of the upper and lower clamping plates and is rotatably mounted outside the second rotating shaft. This utility model enables the UAV to fold its propeller blades when not in use, facilitating storage and transportation, and avoiding the problem of easy damage to the propeller blades upon contact.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a folding propeller structure for a rotary-wing UAV. Background Technology

[0002] Currently, due to their advantages such as small size, light weight, flexible operation, high efficiency and high speed, rotary-wing drones are gradually being widely used in agricultural fields such as pesticide and fertilizer spraying.

[0003] Rotary-wing drones typically have multiple rotors, such as quadcopters, pentcopters, hexacopter drones, etc. See Chinese patent document 201520187859.8, which discloses an agricultural aircraft, essentially a quadcopter drone. Each rotor of this quadcopter drone typically includes a rotor arm, with a motor mounted on the rotor arm. The motor's power output is fitted with blades, which drive the blades to rotate, thus providing lift for the drone's fuselage. However, the rotor arms and blades of this quadcopter drone cannot be folded, making storage and transportation inconvenient, and the blades are easily damaged upon contact.

[0004] In view of this, the applicant filed a patent application on February 26, 2017, for patent number 201720173852.X, which discloses a rotor arm connection mechanism for a rotary-wing UAV. It is easy to assemble and disassemble, and the rotor arm can be folded, which is convenient for storage and transportation. However, the patent has not yet solved the problems that the blades cannot be folded and the blades are easily damaged by contact. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a folding propeller structure for a detachable rotor drone, which can fold the propeller when the drone is not in use, making it easier to store and transport, and avoiding the problem of the propeller being easily damaged by contact.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a folding blade structure for a rotary-wing unmanned aerial vehicle, including an upper clamping plate, a lower clamping plate, a first blade, a second blade, a first rotating shaft, and a second rotating shaft. The upper clamping plate and the lower clamping plate are vertically opposite each other. A first gasket is installed on the lower side of one end of the upper clamping plate, and a second gasket is installed on the upper side of one end of the lower clamping plate. The upper end of the first rotating shaft passes through the first gasket and is connected to one end of the upper clamping plate, and the lower end of the first rotating shaft passes through the second gasket and is connected to one end of the lower clamping plate. One end of the first blade is located between one end of the upper clamping plate and one end of the lower clamping plate, and is rotatably mounted outside the first rotating shaft. One end of a blade contacts and engages with a first washer, and the lower end of the first blade contacts and engages with a second washer. A third washer is installed on the lower side of the other end of the upper clamping plate, and a fourth washer is installed on the upper side of the other end of the lower clamping plate. The upper end of the second rotating shaft passes through the third washer and is connected to the other end of the upper clamping plate, and the lower end of the second rotating shaft passes through the fourth washer and is connected to the other end of the lower clamping plate. One end of the second blade is located between the other ends of the upper and lower clamping plates and is rotatably mounted outside the second rotating shaft. The upper end of the second blade contacts and engages with the third washer, and the lower end of the second blade contacts and engages with the fourth washer.

[0007] In the above technical solution, a first gasket mounting groove is provided on the lower side of one end of the upper clamping plate, the first gasket is installed in the first gasket mounting groove, and the thickness of the first gasket is greater than the depth of the first gasket mounting groove; a second gasket mounting groove is provided on the upper side of one end of the lower clamping plate, the second gasket is installed in the second gasket mounting groove, and the thickness of the second gasket is greater than the depth of the second gasket mounting groove; a third gasket mounting groove is provided on the lower side of the other end of the upper clamping plate, the third gasket is installed in the third gasket mounting groove, and the thickness of the third gasket is greater than the depth of the third gasket mounting groove; a fourth gasket mounting groove is provided on the upper side of the other end of the lower clamping plate, the fourth gasket is installed in the fourth gasket mounting groove, and the thickness of the fourth gasket is greater than the depth of the fourth gasket mounting groove.

[0008] In the above technical solution, one end of the first blade is connected to a first turntable, and the first turntable has a first shaft hole, which is movably fitted outside the first rotating shaft; one end of the second blade is connected to a second turntable, and the second turntable has a second shaft hole, which is movably fitted outside the second rotating shaft.

[0009] In the above technical solution, one end of the upper clamping plate is provided with a first through hole, and one end of the lower clamping plate is provided with a second through hole. The first rotating shaft includes a first upper rotating shaft part and a first lower rotating shaft part. The upper end of the first upper rotating shaft part is provided with a first upper nut, and the lower end of the first lower rotating shaft part is provided with a first lower nut. The first upper rotating shaft part passes through the first through hole from top to bottom and is secured to the upper clamping plate by the first upper nut. The first lower rotating shaft part passes through the second through hole from bottom to top and is secured to the lower clamping plate by the first lower nut. The lower end of the first upper rotating shaft part is provided with a first internal thread, and the upper end of the first lower rotating shaft part is provided with a first external thread. The first upper rotating shaft part and the first lower rotating shaft part are screwed together by the first internal thread and the first external thread. The upper clamping plate has a third through hole at one end, and the lower clamping plate has a fourth through hole at the other end. The second rotating shaft includes a second upper rotating shaft part and a second lower rotating shaft part. The upper end of the second upper rotating shaft part is provided with a second upper nut, and the lower end of the second lower rotating shaft part is provided with a second lower nut. The second upper rotating shaft part passes through the third through hole from top to bottom and is secured to the upper clamping plate by the second upper nut. The second lower rotating shaft part passes through the fourth through hole from bottom to top and is secured to the lower clamping plate by the second lower nut. The lower end of the second upper rotating shaft part is provided with a second internal thread, and the upper end of the second lower rotating shaft part is provided with a second external thread. The second upper rotating shaft part and the second lower rotating shaft part are screwed together by the second internal thread and the second external thread.

[0010] In the above technical solution, the first gasket, the second gasket, the third gasket, and the fourth gasket are nylon gaskets or polyoxymethylene gaskets, respectively.

[0011] The above technical solution also includes a motor and several connecting bolts. The motor has a motor shaft at its upper end, a motor shaft flange outside the motor shaft, and several threaded holes on the motor shaft flange. The upper and lower clamping plates have motor shaft mounting holes in their middle sections, and several connecting holes outside the motor shaft mounting holes. The upper end of the motor shaft is installed in the motor shaft mounting holes of the upper and lower clamping plates. The connecting bolts pass through the connecting holes of the upper and lower clamping plates from top to bottom and are screwed into the threaded holes of the motor shaft flange. Further, there are four connecting bolts, four connecting holes on each of the upper and lower clamping plates, and four threaded holes on the motor shaft flange.

[0012] The beneficial effects of this utility model are: (1) Since one end of the first blade is located between one end of the upper clamping plate and one end of the lower clamping plate and is rotatably mounted outside the first rotating shaft, the first blade can be folded when the UAV is not in use, so as to facilitate storage and transportation and avoid the problem of the first blade being easily damaged by contact; Since one end of the second blade is located between the other end of the upper clamping plate and the lower clamping plate and is rotatably mounted outside the second rotating shaft, the second blade can be folded when the UAV is not in use, so as to facilitate storage and transportation and avoid the problem of the second blade being easily damaged by contact. Problems; (2) In this utility model, since the upper side of one end of the first blade is in contact with the first gasket and the lower side of one end of the first blade is in contact with the second gasket, under the action of the first gasket and the second gasket, it can prevent one end of the first blade from directly touching the upper clamping plate and the lower clamping plate, and reduce the wear of the first blade; In this utility model, since the upper side of one end of the second blade is in contact with the third gasket and the lower side of one end of the second blade is in contact with the fourth gasket, under the action of the third gasket and the fourth gasket, it can prevent one end of the second blade from directly touching the upper clamping plate and the lower clamping plate, and reduce the wear of the first blade. Attached Figure Description

[0013] Figure 1 This is an overall structural diagram of the present invention.

[0014] Figure 2 This is a first-view diagram of the dispersed structure of this utility model.

[0015] Figure 3 This is a second-view diagram of the dispersed structure of this utility model.

[0016] Figure 4 This is a diagram showing the dispersed structure of the present invention after the motor has been removed. Detailed Implementation

[0017] The structural and working principles of this utility model will be further described in detail below with reference to the accompanying drawings.

[0018] like Figures 1-4As shown, this utility model is a folding blade structure for a rotary-wing unmanned aerial vehicle (UAV), including an upper clamping plate 1, a lower clamping plate 2, a first blade 3, a second blade 4, a first rotating shaft 5, and a second rotating shaft 6. The upper clamping plate 1 and the lower clamping plate 2 are vertically opposite each other. A first gasket 7 is installed on the lower side of one end of the upper clamping plate 1, and a second gasket 8 is installed on the upper side of one end of the lower clamping plate 2. The upper end of the first rotating shaft 5 passes through the first gasket 7 and is connected to one end of the upper clamping plate 1, and the lower end of the first rotating shaft 5 passes through the second gasket 8 and is connected to one end of the lower clamping plate 2. One end of the first blade 3 is located between one end of the upper clamping plate 1 and the lower clamping plate 2, and is rotatably mounted outside the first rotating shaft 5. The first blade 3 is in contact with the first gasket 7 on one side, and the lower side of one end of the first blade 3 is in contact with the second gasket 8 on the other side. The lower side of the other end of the upper clamping plate 1 is equipped with a third gasket 9, and the upper side of the other end of the lower clamping plate 2 is equipped with a fourth gasket 10. The upper end of the second rotating shaft 6 passes through the third gasket 9 and is connected to the other end of the upper clamping plate 1. The lower end of the second rotating shaft 6 passes through the fourth gasket 10 and is connected to the other end of the lower clamping plate 2. One end of the second blade 4 is located between the other ends of the upper clamping plate 1 and the lower clamping plate 2, and is rotatably mounted outside the second rotating shaft 6. The upper side of one end of the second blade 4 is in contact with the third gasket 9, and the lower side of one end of the second blade 4 is in contact with the fourth gasket 10.

[0019] Because one end of the first propeller blade 3 is located between one end of the upper clamping plate 1 and one end of the lower clamping plate 2, and is rotatably mounted outside the first rotating shaft 5, the first propeller blade 3 can be folded when the drone is not in use, facilitating storage and transportation, and avoiding the problem of the first propeller blade 3 being easily damaged by contact. Because one end of the second propeller blade 4 is located between the other end of the upper clamping plate 1 and the lower clamping plate 2, and is rotatably mounted outside the second rotating shaft 6, the second propeller blade 4 can be folded when the drone is not in use, facilitating storage and transportation, and avoiding the problem of the second propeller blade 4 being easily damaged by contact. The upper side of one end of the first blade 3 contacts and engages with the first gasket 7, and the lower side of one end of the first blade 3 contacts and engages with the second gasket 8. Therefore, under the action of the first gasket 7 and the second gasket 8, the upper side of the first blade 3 can be prevented from directly contacting the upper clamping plate 1 and the lower clamping plate 2, and the wear of the first blade 3 can be reduced. In this utility model, the upper side of one end of the second blade 4 contacts and engages with the third gasket 9, and the lower side of one end of the second blade 4 contacts and engages with the fourth gasket 10. Therefore, under the action of the third gasket 9 and the fourth gasket 10, the upper side of the second blade 4 can be prevented from directly contacting the upper clamping plate 1 and the lower clamping plate 2, and the wear of the first blade 3 can be reduced.

[0020] like Figures 2-4As shown, the upper clamping plate 1 has a first gasket mounting groove 101 on its lower side at one end, and the first gasket 7 is installed in the first gasket mounting groove 101, with the thickness of the first gasket 7 being greater than the depth of the first gasket mounting groove 101; the lower clamping plate 2 has a second gasket mounting groove 21 on its upper side at one end, and the second gasket 8 is installed in the second gasket mounting groove 21, with the thickness of the second gasket 8 being greater than the depth of the second gasket mounting groove 21; the upper clamping plate 1 has a third gasket mounting groove 102 on its lower side at the other end, and the third gasket 9 is installed in the third gasket mounting groove 102, with the thickness of the third gasket 9 being greater than the depth of the third gasket mounting groove 102; the lower clamping plate 2 has a fourth gasket mounting groove 22 on its upper side at the other end, and the fourth gasket 10 is installed in the fourth gasket mounting groove 22, with the thickness of the fourth gasket 10 being greater than the depth of the fourth gasket mounting groove 22. By providing the first gasket mounting groove 101, the first gasket 7 can be securely installed and positioned. By providing the second gasket mounting groove 21, the second gasket 8 can be securely installed and positioned. By providing the third gasket mounting groove 102, the third gasket 9 can be securely installed and positioned. By providing the fourth gasket mounting groove 22, the fourth gasket 10 can be securely installed and positioned. Furthermore, since the thickness of the first gasket 7, the second gasket 8, the third gasket 9, and the fourth gasket 10 is greater than the depth of the corresponding mounting groove, one end of each of the first gasket 7, the second gasket 8, the third gasket 9, and the fourth gasket 10 can extend outward from the mounting groove to contact the first or second blade.

[0021] like Figure 4 As shown, one end of the first blade 3 is connected to a first turntable 31, and a first shaft 32 is provided in the first turntable 31. The first shaft hole 32 is movably fitted outside the first rotating shaft 5. One end of the second blade 4 is connected to a second turntable 41, and a second shaft hole 42 is provided in the second turntable 41. The second shaft hole 42 is movably fitted outside the second rotating shaft 6. By using the first turntable 31 and the second turntable 41, smooth folding and rotation performance of the first blade 3 and the second blade 4 can be provided.

[0022] like Figure 4As shown, one end of the upper clamping plate 1 is provided with a first through hole 103, and one end of the lower clamping plate 2 is provided with a second through hole 23. The first rotating shaft 5 includes a first upper rotating shaft part 51 and a first lower rotating shaft part 52. The upper end of the first upper rotating shaft part 51 is provided with a first upper nut 53, and the lower end of the first lower rotating shaft part 52 is provided with a first lower nut 54. The first upper rotating shaft part 51 passes through the first through hole 103 from top to bottom and is secured to the upper clamping plate 1 by the first upper nut 53. The first lower rotating shaft part 52 passes through the second through hole 23 from bottom to top and is secured to the lower clamping plate 2 by the first lower nut 54. The lower end of the first upper rotating shaft part 51 is provided with a first internal thread 55, and the upper end of the first lower rotating shaft part 52 is provided with a first external thread 56. The first upper rotating shaft part 51 and the first lower rotating shaft part 52 are screwed together by the first internal thread 55 and the first external thread 56. The upper clamping plate 1 has a third through hole 104 at one end, and the lower clamping plate 2 has a fourth through hole 24 at the other end. The second rotating shaft 6 includes a second upper rotating shaft part 61 and a second lower rotating shaft part 62. The upper end of the second upper rotating shaft part 61 is provided with a second upper nut 63, and the lower end of the second lower rotating shaft part 62 is provided with a second lower nut 64. The second upper rotating shaft part 61 passes through the third through hole 104 from top to bottom and is secured to the upper clamping plate 1 by the second upper nut 63. The second lower rotating shaft part 62 passes through the fourth through hole 24 from bottom to top and is secured to the lower clamping plate 2 by the second lower nut 64. The lower end of the second upper rotating shaft part 61 is provided with a second internal thread 65, and the upper end of the second lower rotating shaft part 62 is provided with a second external thread 66. The second upper rotating shaft part 61 and the second lower rotating shaft part 62 are screwed together by the second internal thread 65 and the second external thread 66. This structure allows for easy installation and disassembly of the upper clamping plate 1, lower clamping plate 2, first blade 3, second blade 4, first shaft 5, second shaft 6, first gasket 7, second gasket 8, third gasket 9, and fourth gasket 10.

[0023] As a preferred embodiment of this utility model, the first gasket 7, the second gasket 8, the third gasket 9, and the fourth gasket 10 are nylon gaskets or polyoxymethylene gaskets, respectively. Nylon gaskets or polyoxymethylene gaskets have excellent durability and are flexible, which can prevent the first blade 3 and the second blade 4 from rigidly contacting the gaskets, thereby improving the durability of the first blade 3 and the second blade 4.

[0024] like Figures 1-3As shown, the folding propeller structure of the rotary-wing UAV also includes a motor 11 and several connecting bolts 12. The upper end of the motor 11 is provided with a motor shaft 13, and a motor shaft flange 14 is provided outside the motor shaft 13. Several threaded holes 141 are provided on the motor shaft flange 14. A motor shaft mounting hole 15 is provided in the middle of the upper clamping plate 1 and the lower clamping plate 2. Several connecting holes 16 are provided outside the motor shaft mounting hole 15. The upper end of the motor shaft 13 is installed in the motor shaft mounting hole 15 of the upper clamping plate 1 and the lower clamping plate 2. The connecting bolts 12 pass through the connecting holes 16 of the upper clamping plate 1 and the lower clamping plate 2 from top to bottom and are screwed into the threaded holes 141 of the motor shaft flange 14. Preferably, there are four connecting bolts 12, four connecting holes 16 are provided on each of the upper clamping plate 1 and the lower clamping plate 2, and four threaded holes 141 are provided on the motor shaft flange 14. This utility model can securely connect the upper clamping plate 1 and the lower clamping plate 2 to the motor shaft flange 14 by means of connecting bolt 12. Through the cooperation of the motor shaft mounting hole 15 and the motor shaft 13, the upper clamping plate 1 and the lower clamping plate 2 can be prevented from swaying left and right.

[0025] The above description is merely a preferred embodiment of this utility model. Any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical solution of this utility model shall fall within the scope of the technical solution of this utility model.

Claims

1. A folding propeller structure for a rotary-wing unmanned aerial vehicle, characterized in that: The device includes an upper clamping plate, a lower clamping plate, a first blade, a second blade, a first rotating shaft, and a second rotating shaft. The upper and lower clamping plates are vertically opposite each other. A first washer is installed on the lower side of one end of the upper clamping plate, and a second washer is installed on the upper side of one end of the lower clamping plate. The upper end of the first rotating shaft passes through the first washer and connects to one end of the upper clamping plate, while the lower end of the first rotating shaft passes through the second washer and connects to one end of the lower clamping plate. One end of the first blade is positioned between one end of the upper and lower clamping plates and is rotatably mounted outside the first rotating shaft. The upper side of one end of the first blade contacts and engages with the first washer. The lower side of one end of the first blade contacts and engages with the second washer; a third washer is installed on the lower side of the other end of the upper clamping plate, and a fourth washer is installed on the upper side of the other end of the lower clamping plate; the upper end of the second rotating shaft passes through the third washer and is connected to the other end of the upper clamping plate, and the lower end of the second rotating shaft passes through the fourth washer and is connected to the other end of the lower clamping plate; one end of the second blade is located between the other ends of the upper and lower clamping plates and is rotatably mounted outside the second rotating shaft; the upper side of one end of the second blade contacts and engages with the third washer, and the lower side of one end of the second blade contacts and engages with the fourth washer.

2. The folding propeller structure of the rotary-wing UAV according to claim 1, characterized in that: The upper clamping plate has a first gasket mounting groove on its lower side at one end, and the first gasket is installed in the first gasket mounting groove, with the thickness of the first gasket being greater than the depth of the first gasket mounting groove. The lower clamping plate has a second gasket mounting groove on its upper side at one end, and the second gasket is installed in the second gasket mounting groove, with the thickness of the second gasket being greater than the depth of the second gasket mounting groove. The upper clamping plate has a third gasket mounting groove on its lower side at the other end, and the third gasket is installed in the third gasket mounting groove, with the thickness of the third gasket being greater than the depth of the third gasket mounting groove. The lower clamping plate has a fourth gasket mounting groove on its upper side at the other end, and the fourth gasket is installed in the fourth gasket mounting groove, with the thickness of the fourth gasket being greater than the depth of the fourth gasket mounting groove.

3. The folding propeller structure of the rotary-wing UAV according to claim 1, characterized in that: One end of the first blade is connected to a first turntable, and the first turntable has a first shaft hole, which is movably fitted outside the first rotating shaft; one end of the second blade is connected to a second turntable, and the second turntable has a second shaft hole, which is movably fitted outside the second rotating shaft.

4. The folding propeller structure of the rotary-wing UAV according to claim 1, characterized in that: One end of the upper clamping plate is provided with a first through hole, and one end of the lower clamping plate is provided with a second through hole. The first rotating shaft includes a first upper rotating shaft part and a first lower rotating shaft part. The upper end of the first upper rotating shaft part is provided with a first upper nut, and the lower end of the first lower rotating shaft part is provided with a first lower nut. The first upper rotating shaft part passes through the first through hole from top to bottom and is secured to the upper clamping plate by the first upper nut. The first lower rotating shaft part passes through the second through hole from bottom to top and is secured to the lower clamping plate by the first lower nut. The lower end of the first upper rotating shaft part is provided with a first internal thread, and the upper end of the first lower rotating shaft part is provided with a first external thread. The first upper rotating shaft part and the first lower rotating shaft part are screwed together by the first internal thread and the first external thread.

5. The folding propeller structure of the rotary-wing UAV according to claim 1, characterized in that: The upper clamping plate has a third through hole at one end, and the lower clamping plate has a fourth through hole at the other end. The second rotating shaft includes a second upper rotating shaft part and a second lower rotating shaft part. The upper end of the second upper rotating shaft part is provided with a second upper nut, and the lower end of the second lower rotating shaft part is provided with a second lower nut. The second upper rotating shaft part passes through the third through hole from top to bottom and is secured to the upper clamping plate by the second upper nut. The second lower rotating shaft part passes through the fourth through hole from bottom to top and is secured to the lower clamping plate by the second lower nut. The lower end of the second upper rotating shaft part is provided with a second internal thread, and the upper end of the second lower rotating shaft part is provided with a second external thread. The second upper rotating shaft part and the second lower rotating shaft part are screwed together by the second internal thread and the second external thread.

6. The folding propeller structure of the rotary-wing UAV according to any one of claims 1-5, characterized in that: The first gasket, the second gasket, the third gasket, and the fourth gasket are nylon gaskets or polyoxymethylene gaskets, respectively.

7. The folding propeller structure of the rotary-wing UAV according to any one of claims 1-5, characterized in that: It also includes a motor and several connecting bolts. The upper end of the motor is provided with a motor shaft, and a motor shaft flange is provided outside the motor shaft. Several threaded holes are provided on the motor shaft flange. The upper clamping plate and the lower clamping plate are provided with motor shaft mounting holes in the middle. Several connecting holes are provided outside the motor shaft mounting holes. The upper end of the motor shaft is installed in the motor shaft mounting holes of the upper clamping plate and the lower clamping plate. The connecting bolts pass through the connecting holes of the upper clamping plate and the lower clamping plate from top to bottom and are screwed into the threaded holes of the motor shaft flange.

8. The folding propeller structure of the rotary-wing UAV according to claim 7, characterized in that: The number of connecting bolts is four, the upper clamping plate and the lower clamping plate are each provided with four connecting holes, and the motor shaft flange is provided with four threaded holes.

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