Please select the most similar patent number from A, B, C and D. Which number is?
An unmanned aerial vehicle (100) comprises a fuselage (110), a spraying device (120) and a controller (130). The spraying device comprises a support (121), at least two spray nozzles (122) and a driving mechanism (123). The support is connected to the fuselage. The driving mechanism is mounted on the support, and can drive the at least two spray nozzles to be movably provided on the support. The controller is electrically connected to the driving mechanism, and is used to control, according to an acquired control instruction, operation of the driving mechanism to change positions of the at least two spray nozzles relative to the support so as to adjust the spray width of the unmanned aerial vehicle. In the unmanned aerial vehicle, the controller controls, according to the acquired control instruction, operation of the driving mechanism to change the positions of the spray nozzles relative to the support so as to perform online adjustment of the spray width of the unmanned aerial vehicle for different spray scenarios, thereby avoiding repeated or missed spraying of certain regions.
A: An arm assembly (100), comprising first arms (10), second arms (20), and adjustment mechanisms (30). Each adjustment mechanism (30) is connected to at least one of each first arm (10) and each second arm (20); and at least part of the adjustment mechanism (30) can move relative to the first arm (10) and/or the second arm (20), so as to adjust the natural frequency of an unmanned aerial vehicle (1000), thereby reducing the situation that the unmanned aerial vehicle (1000) generates resonance, and further improving the imaging quality of a photographing apparatus (500) and the flight stability of the unmanned aerial vehicle (1000). Further involved are the unmanned aerial vehicle (1000) and a control method for the arm assembly (100).
B: An unmanned aerial vehicle (1000) comprises spraying systems (100) and a controller (510). Each spraying system (100) comprises a liquid storage device (10), a liquid conveying pipe (20), and a spray head assembly (30). The spray head assembly (30) comprises a spray head body (32), a nozzle (34), and an ultrasonic generating component (36). The liquid conveying pipe (20) can guide a liquid in the liquid storage device (10) into the spray head body (32), and then the liquid is sprayed by means of the nozzle (34). The ultrasonic generating component (36) can generate vibration under the control of the controller (510) to drive the nozzle (34) to vibrate, so as to change the particle size of liquid droplets that are sprayed by means of the nozzle (34). Further disclosed is a spraying control method for use in the unmanned aerial vehicle. The unmanned aerial vehicle and the spraying control method therefor can achieve the spraying requirement of spraying different liquids by using a nozzle, thereby being capable of reducing the use cost of a user; moreover, the user does not need to frequently replace the nozzle, thereby being capable of saving the time of the user, and also being capable of avoiding abrasion caused during nozzle replacement.
C: Disclosed is a propulsion system for an unmanned aerial vehicle, the system comprising a propulsion motor (121) and a locking device (203). The propulsion motor (121) is used to drive a propeller (122) of the unmanned aerial vehicle (100). The locking device (203) is used to releasably couple the propeller (122) to the propulsion motor (121). The locking device (203) comprises a matching part (301), a part of the matching part (301) being able to move with respect to the propulsion motor (121) and/or the propeller (122) along a rotating axis (302) of the propulsion motor (121) such that the matching part (301) is located in a matching position where the propeller (122) and the propulsion motor (121) are locked and in a separated position different from the matching position. The propulsion system can improve the safety of the unmanned aerial vehicle. Further disclosed are a propeller for an unmanned aerial vehicle, an unmanned aerial vehicle, a suite of the unmanned aerial vehicle, a method for coupling the propeller to the unmanned aerial vehicle, a controller for the vehicle body, a control system, and a method for operating the controller in the unmanned aerial vehicle.
D: Disclosed is an undercarriage and an unmanned aerial vehicle provided with same, the undercarriage (40) comprising: a driving device (41), a transmission mechanism (43) capable of transforming a linear motion into a rotation motion, a first sleeve (44) and a support rod (48), wherein the transmission mechanism (43) is connected to the driving device (41); the transmission mechanism (43) passes through the first sleeve (44); and the support rod (48) is connected to the first sleeve (44), and the driving device (41) is connected to the support rod (48) via the transmission mechanism (43) and can drive the support rod (48) to be rotatably folded or unfolded relative to the first sleeve (44). In this manner, during the flight of the unmanned aerial vehicle, the support rod (48) can be folded and retracted to prevent the support rod (48) of the undercarriage from blocking a camera device (30) mounted on the unmanned aerial vehicle, such that the shooting effect of the camera device (30) is improved.
Answer: B