Please select the most similar patent number from A, B, C and D. Which number is?
A torque balance device (100), a self-balancing joint (10), and a surgical robot (1). The torque balance device (100) comprises a first body portion (110), a second body portion (111), an elastic portion (120), and a transmission portion (130), wherein the first body portion (110) comprises a first connection end and a first opposite end opposite to the first connection end; the second body portion (111) comprises a second connection end and a second opposite end opposite to the second connection end; the second connection end of the second body portion (111) is rotatably connected to the first connection end of the first body portion (110); the elastic portion (120) is provided in the first body portion (110); and the transmission portion (130) and the second body portion (111) are connected to the elastic portion (120).
A: A joint structure, comprising a first main body (1), a second main body (2), a motor (4), and a harmonic speed reducer (3). The harmonic speed reducer (3) is provided with a flexible wheel (31), a rigid wheel (32), and a wave generator (33); the second main body (2) comprises a first member (21) and a second member (22) fixedly connected to each other; the first member (21) is provided with a first hole (211); the harmonic speed reducer (3) is located in the first hole (211); the harmonic speed reducer (3) is located between the first main body and the second member (22); the rigid wheel (32) is fixedly connected to the first member (21); an outer peripheral wall of the rigid wheel (32) matches an inner peripheral wall of the first hole (211); the flexible wheel (31) is fixedly connected to the first main body (1); the second member (22) is provided with a first boss (223) and a second hole (221); an outer peripheral wall of the first boss (223) matches the inner peripheral wall of the first hole (211); a machine body of the motor (4) is fixed to the side of the second member (22) facing away from the first member (21); and a rotating shaft of the motor (4) passes through the second hole (221) and is then connected to the wave generator (33). The joint structure is easy to mount and operate, and the joint structure can adapt to high-speed operation. Further provided are an industrial robot, a mechanical arm, and an assembling method for the joint structure.
B: A transport vehicle (V1) for a case body of a mobile power generation system, comprising: a chassis (100) comprising a main beam (110), and a lifting mechanism assembly (200) located on the chassis (100). The lifting mechanism assembly (200) comprises: a flipping frame (210) hingedly connected to the chassis (100) at a hinge position (MP) of the chassis (100), at least one flipping hydraulic cylinder (L1) connecting the flipping frame (210) and the chassis (100), and a connecting frame (230) configured to be detachably connected to the case body. A first body part (111) of the main beam (110) is located between the hinge position (MP) and a second body part (112), and a third plane (P3) where the surface of the second body part (112) facing the flipping frame (210) is located is further away from the connecting frame (230) relative to a first plane (P1) where the surface of the first body part (111) facing the flipping frame (210) is located; a part of the lifting mechanism assembly (200) is located between the first plane (P1) and the third plane (P3) when the angle value of a first included angle (A1) between the first plane (P1) and a second plane (P2) where the surface of the flipping frame (210) facing away from the first body part (111) is located is minimum. In this way, the installation and disassembly of the case body are simplified, and the disadvantageous increase of the height of the transport vehicle is avoided. In addition, also provided is an installation method for a case body of a mobile power generation system.
C: A wearable electronic device, comprising a first main body portion; a second main body portion, the second main body portion being connected to the first main body portion; a wearable portion, connected to opposite ends of the first main body portion, the wearable portion being used to secure the first main body portion and the second main body portion onto an external object; a first antenna, arranged on the first main body portion or the second main body portion, the first antenna being used to transmit a radio frequency signal; and a second antenna, arranged on the wearable portion, the second antenna being used to transmit a radio frequency signal.
D: Disclosed is a light blocking device (100), comprising a front support (1), a first baffle (2), a rear support (3) and a second baffle (4), wherein the front support (1) comprises a first support main body (11), a first sliding rail (12) and a first light passing port (110), and the first sliding rail (12) extends in a first direction; the first baffle (2) comprises a first main body portion (21) and a first sliding portion (22); the first main body portion (21) may slide relative to the front support (1) in the first direction by means of the first sliding portion (22), such that the first main body portion (21) at least partially covers the first light passing port (110); the rear support (3) comprises a second support main body (31), a second sliding rail (32), and a second light passing port (310) concentrically provided with the first light passing port (110); the second support main body (31) is fixed to the first support main body (11); the second sliding rail (32) extends in a second direction, and the second direction is perpendicular to the first direction; and the second baffle (4) comprises a second main body portion (41) and a second sliding portion (42), and the second main body portion (41) may slide relative to the rear support (3) in the second direction by means of the second sliding portion (42), such that the second main body portion (41) at least partially covers the second light passing port (310). Compared with the related art, the light blocking device (100) has a good blocking effect.
Answer: A