Please select the most similar patent number from A, B, C and D. Which number is?
A stacked drive compact multi-roller rolling mill, comprising a machine frame (6), roller shafts (2) and rollers (1) disposed on the roller shafts (2); a plurality of roller shafts are circumferentially arranged in the same plane so that the rollers on the roller shafts form rolling holes; the multi-roller rolling mill further comprises drive shafts (3) in one-to-one correspondence with the roller shafts; drive gears (3-1) are disposed on the drive shafts; the roller shafts are provided with driven gears (2-1) engaged with the drive gears; the drive shafts are further provided with bevel gears (3-2); neighboring bevel gears on different drive shafts are mutually engaged so that the planes of the roller shafts and the planes of the drive shafts form a stacked drive structure. By employing stacked drive, the multi-roller rolling mill reduces the complexity of a rolling mill drive system, shortens the drive chain, improves drive efficiency, and avoids adverse effect on the engagement of the bevel gears during roll gap adjustment.
A: An auto-leveling drive axle device for a wheel tractor, and leveling method. The device comprises a transmission device and a leveling device. The transmission device comprises a drive axle housing (2), a half-shaft bevel gear (3), a vertical transmission shaft (4), and a wheel-side planetary reduction gear mechanism (9). The vertical transmission shaft (4) has an upper end connected to an upper vertical shaft bevel gear (5) via a spline, and a lower end fixed to a lower vertical shaft bevel gear (11). The half-shaft bevel gear (3) is mounted on the drive axle housing (2) by means of a bearing, and meshes with the upper vertical shaft bevel gear (5). The lower vertical shaft bevel gear (11) meshes with a bevel gear of the wheel-side planetary reduction gear mechanism (9) to drive a wheel (8). The leveling device employs a hydraulic system, and the hydraulic system comprises a hydraulic solenoid-operated directional control valve (10) and a hydraulic cavity in communication therewith and provided below the drive axle housing. By controlling a liquid to flow into or out of the hydraulic cavity, the drive axle housing (2) is driven to move upward or downward with respect to the wheel (8), thus realizing leveling of the drive axle. The device of the present invention changes only a vertical position of a drive axle with respect to a wheel, and a wheel shaft distance and wheel center spacing are not changed, thus improving traveling stability of a vehicle.
B: A flexible shaft transmission system for a motorcycle comprises a first gear box (1). A first driving gear (11) and a driven gear (12) meshed with each other are provided in the house of the first gear box. The first driving gear is connected with a spline output shaft of a motorcycle engine through a spline hole being coaxial with the first driving gear. The first driven gear is fixedly mounted on a first gear shaft (13), and the first driven gear is engaged with a second driven gear (14). A driving bevel gear (16) is coaxially fixed with the second driven gear through a second gear shaft (15). The driving bevel is meshed with a driven bevel gear (17), and the driven bevel gear is connected with the input end of a transmission flexible shaft (3) at an equal rotating speed. The house of the first gear box is composed of a first box body (18) and a first box lid (19). The first driving gear, the first gear shaft and the second gear shaft are respectively supported on the first box body and the first box lid through bearings arranged on the two ends thereof. The transmission system is reasonably structured, expediently manufactured and is suitable for mass production. Furthermore, the accuracy of the first gear box is well kept and the service life of the transmission system is prolonged.
C: Disclosed are an independently driven rolling mill and a unit therefor, the independently driven rolling mill comprising an electric motor (6), a gearbox (4), a bevel gear box (1-1, 1-2) and a roller box (2) arranged in succession, wherein one electric motor corresponds to one gearbox and is connected via a connecting shaft I (5), the gearbox and the bevel gear box are connected via a connecting shaft II (3), and one bevel gear box corresponds to one roller box and is connected via geared transmission. Using an independent electric motor drive, the equipment structure is much simpler than a centralised drive, the equipment structure is simple and compact and more convenient for increasing high speed operating stability of the equipment; by means of different rolling directions, the unit enables rolling mills to be arranged at the same side or alternately arranged on different sides, which can significantly save on space occupied by rolling mills in the width direction, enabling the whole structural layout to be more compact.
D: Disclosed is a high-efficiency stirring and mixing machine, comprising a stirring and mixing pool, two vertically arranged guide rails, and a machine frame moving along the guide rails, characterized in that a transverse mounting frame is arranged on the machine frame, a driving shaft is rotatably arranged on the mounting frame, an actuator connected to the driving shaft is arranged on the machine frame, and both ends of the driving shaft are connected, via a transmission belt, to a stirring and mixing frame located in the stirring and mixing pool; and multiple driving bevel gears are coaxially arranged on the driving shaft, driven bevel gears engaged with the driving bevel gears are rotatably arranged on the mounting frame, the center of each of the driven bevel gears is connected to a rotary shaft extending downwards into the stirring and mixing pool, and each of the rotary shafts is provided with a mixing mechanism. The key point of the technical solution thereof is that the actuator drives the driving shaft to rotate, so that the mixing mechanisms cooperate with the stirring and mixing frame to simultaneously mix materials so as to mix same more thoroughly.
Answer: C