Please select the most similar patent number from A, B, C and D. Which number is?
A large foldable four-ridge-eight-row peanut planter comprises a mounting frame (1) and a planter main frame (26), and also comprises a parallelogram-shaped hydraulic folding beam frame (2). The mounting frame (1) is fixedly disposed at a front end of the parallelogram-shaped hydraulic folding beam frame (2), and the planter main frame (26) is disposed behind the parallelogram-shaped hydraulic folding beam frame (2). The parallelogram-shaped hydraulic folding beam frame (2) comprises a support main beam frame (46), a middle connecting beam frame (44), an outward extending folding beam frame (42) and a parallel cross rod (48). The support main beam frame (46), the middle connecting beam frame (44) and the parallel cross rod (48) constitute a parallelogram-shaped structure. The planter main frame (26) comprises a middle planter axle (36) and side planter axles (33). The middle planter axle (36) is located between two side planter axles (33). The two side planter axles (33) are connected to the outward extending folding beam frame (42) through a wide ground-contour following mechanism (29) respectively. The planter has a compact structure, complete functions, high operation efficiency and good ground-contour following capability, and integrates multiple processes.
A: Disclosed are a weeding machine and weeding method for seedlings in a paddy field. The weeding machine comprises a paddy field power chassis (1), a lifting hydraulic cylinder (2), a parallelogram suspension frame (3), a weeding machine frame (5), a transmission assembly and a weeding unit, wherein the paddy field power chassis vertically adjusts the working depth of the weeding machine by means of the parallelogram suspension frame and the lifting hydraulic cylinder; the transmission assembly transmits power to the weeding unit; the weeding unit is used for pulling inter-row weeds and feeding same into a weed chopping channel; a spiral weed chopping knife is used for chopping the weeds and conveying same to a feeding channel; and a two-way variable-pitch conveyer conveys the chopped weeds to a discharge port of the feeding channel in a pressurized manner and then discharges same for burying inter-plant weeds. According to the weeding machine, the inter-plant weeds are removed in a weeding-chopping-burying working process, which can reserve seedlings, and achieve a thorough weeding operation, a high working efficiency and a good weeding effect.
B: Disclosed is a planter for planting crops, the planter comprising a seed box (1), a rotary cultivator A (2) and a rotary cultivator B (3), wherein the seed box (1), the rotary cultivator A (2) and the rotary cultivator B (3) are all mounted on a support beam (4); the rotary cultivator A (2) is located between the seed box (1) and the rotary cultivator B (3), and the rotary cultivator B (3) is located at the right of the rotary cultivator A (2); a lower end of the seed box (1) is connected to a seeding device (13); a guide wheel (14) is arranged on a lower end on the left side of the support beam (4), and a roller (10) is arranged on the lower end on the right side of the support beam (4); and rotary blades A (12) and rotary blades B (11) are respectively mounted on lower ends of the rotary cultivator A (2) and the rotary cultivator B (3). By providing two rotary cultivators, the land can be fully flattened and crushed such that all the soil blocks are divided into smaller soil blocks, so that the crops are planted and then can grow more smoothly, a conveying device (18) and a seeding plate (20) arranged in the seeding device (13) can allow seeds to be seeded evenly, ensuring that the crop seeds are seeded evenly in the land and allowing crops to grow more evenly, which is practical and suitable for extensive promotion and use.
C: A method and device for controlling the seeding depth of a no-tillage seeder. The device is disposed on the no-tillage seeder. The device for controlling the seeding depth of the no-tillage seeder comprises: an overall control system (1); a detection system, comprising a furrowing depth detecting unit (21), a pressing force sensor (22), a compaction force sensor (23) and a data acquisition unit (24); and a regulating system, comprising a hydraulic controller (31), a hydraulic valve group (32), a pressing oil cylinder (33) and a compacting oil cylinder (34).
D: A multifunction foldable bed comprising a folding-type bed (1). A center vertical board (12) is arranged at one side of the folding-type bed (1). End vertical boards (11), side upper boards (13), and side lower boards (14) are arranged symmetrically at two sides of the center vertical board (12). The center vertical board (12), the end vertical boards (11), the side upper boards (13), and the side lower boards (14) are assembled to form a parallelogram-shaped linked structure. End upper boards (15) and end lower boards (16) fitted with the end vertical boards (11) are arranged at ends of the folding-type bed (1). Multiple flexible casters (10) are arranged on the bottom face of the folding-type bed (1), while a wooden board (17) is arranged on the top face. Because the multifunction foldable bed is provided with the casters (10), the effects of folding, effortless moving, and causing no damage to a floor (F) are thus provided; also, when in use under a prescribed load, the end vertical boards (11), the end lower board (16), and the casters (10) act with each other, thereby coming into contact with the floor (F) over a large area, a significant stabilization effect is thus provided.
Answer: B