Please select the most similar patent number from A, B, C and D. Which number is?
A household vertical type food mixing machine, comprising a body (402), and a motor (404) horizontally arranged in the body (402). The household vertical type food mixing machine further comprises: a main shaft (411) rotatably arranged on the body (402), the front end of a central shaft (405) of the motor (404) being connected to the main shaft (411) via a transmission (406); a front output shaft (413) rotatably arranged on the body (402), a first front bevel gear (412) being fixedly arranged on the upper end of the main shaft (411) and a second front bevel gear (414) meshed to the first front bevel gear (412) being fixedly arranged on the front output shaft (413); and a rear output shaft (417) rotatably arranged on the body (402), a first rear bevel gear (416) being fixed on the rear end of the central shaft (405) of the motor (404) and a second rear bevel gear (419) for meshing to the first rear bevel gear (416) being arranged on the rear output shaft (417). The household vertical type food mixing machine is able to achieve a variety of food processing methods, provides multiple purposes with a single machine, and is safe and easy to operate.
A: A robot comprises a machine body (1), and a motor (2), a transmission system (3), and a traveling mechanism (4) disposed on the machine body. The transmission system comprises an output shaft gear (5) connected to a motor output shaft (20), a main gear (6) connected to the output shaft gear, a rotating shaft (7) disposed on the main gear, and two eccentric components (8) sleeved on the rotating shaft and respectively disposed at two ends (71, 72) of the rotating shaft, wherein the two eccentric components have central symmetry about an intersection point of the main gear and the rotating shaft. The traveling mechanism comprises a first connection rod (41), a second connection rod (42), and a third connection rod (43). One end (411) of the first connection rod is connected to the eccentric components, and the other end (412) thereof is rotatably connected to an upper end (421) of the second connection rod. One end (431) of the third connection rod is rotatably connected to the machine body, and the other end (432) thereof is rotatably connected to the upper end of the second connection rod. Rotation of the eccentric components drives the first connection rod, the second connection rod, and the third connection rod to perform a linked movement. The structure combines in a flexible manner, has structural sturdiness, and is used to mimic a knee-lifting movement of a walking human to form a simulated movement path equivalent to that of a human leg. The robot mimics a kinetic structure of a human, is useful in robotic education and studies for youths and as a toy for kids, and has a simple structure and a low cost.
B: A walking robot (100), comprising a robot body (1), and a motor (2), a transmission system (3) and a walking mechanism (4) provided on the robot body (1). The transmission system (3) comprises an output shaft gear (5) connected to an output shaft (20) of the motor (2), a main gear (6) connected to the output shaft gear (5), a rotating shaft (7) provided on the main gear (6), and two eccentric members (8) provided on the rotating shaft (7) in a penetrating manner and respectively provided at two ends (71, 72) of the rotating shaft (7). The walking mechanism (4) comprises a first connecting rod (41), a second connecting rod (42), and a third connecting rod (43); one end (411) of the first connecting rod (41) is connected to the eccentric member (8), and the other end (412) is rotatably connected to the upper end (421) of the second connecting rod (42); one end (431) of the third connecting rod (43) is rotatably connected to the robot body (1), and the other end is rotatably connected to the upper end (421) of the second connecting rod (42). The robot is provided with a limiting device (10), and the limiting device (10) is provided on the robot body (1) and the walking mechanism (4) so that the first connecting rod (41) is lifted to a set height.
C: A lawn mower, comprising a machine body (10), a mowing mechanism (20) and a control mechanism (40); the mowing mechanism (20) is disposed in a space at the lower part of the machine body (10); the control mechanism (40) comprises at least one control rod (42) and at least one control main body (41); the control rod (42) is provided with a high end part (421) and a low end part (422) corresponding to the high end part (421); the control main body (41) comprises a mounting seat (411) and a pivoting seat (412) which is rotatably disposed on the mounting seat (411); the mounting seat (411) is provided on the machine body (10); and the low end part (422) of the control rod (42) is mounted on the pivoting seat (412). When the high end part (421) of the control rod (42) swings back and forth, the low end part (422) of the control rod (42) drives the pivoting seat (412) to rotate relative to the mounting seat (411), so that the travel direction and travel speed of the lawnmower may be controlled such that a user may conveniently control the lawnmower. The control mechanism comprises: the control rod (42), the control rod (42) being provided with the high end part (421) and the low end part (422) corresponding to the high end part (421); and the control main body (41), the control main body (41) comprising the mounting seat (411) and the pivoting seat (412) which is rotatably disposed on the mounting seat (411), and the low end part (422) of the control rod (42) being mounted on the pivoting seat (412). When the high end part (421) of the control rod (42) swings back and forth, the low end part (422) of the control rod (42) drives the pivoting seat (412) to rotate relative to the mounting seat (411), so that the maximum forward travel speed and maximum reverse travel speed of the lawnmower may be controlled, thereby ensuring the safety of the lawnmower and facilitating a user controlling the lawnmower.
D: Disclosed is a blender (10). The blender (10) comprises: a first drive shaft (1), a second drive shaft (2), a drive member (3) and a transmission device (4). The transmission device (4) comprises: a first bevel gear (41), a second bevel gear (42), a third bevel gear (43) and a holding bracket (44), wherein the second bevel gear (42) is connected to the second drive shaft (2); the first bevel gear (41) and the second bevel gear (42) are arranged in an axially opposite manner; the third bevel gear (43) is engaged between the first bevel gear (41) and the second bevel gear (42); the third bevel gear (43) is rotatably arranged at the holding bracket (44); the holding bracket (44) is rotatably arranged at the second drive shaft (2); and the third bevel gear (43) selectively rotates or revolves. The blender has the effects of crushing with a cutter head and cutting food materials in an improved manner.
Answer: D