Please select the most similar patent number from A, B, C and D. Which number is?
A rotary ditcher for agricultural machinery, comprising a ditcher structure (1), a telescopic rod (8), and a diesel engine. The ditcher structure (1) further comprises a rack (2) and a ditching body (3); the diesel engine is fixedly mounted by means of the rack (2); the diesel engine is connected to the ditching body (3) by means of a belt; the ditching body (3) is rotatably mounted by means of the rack (2); the rack (2) is fixedly mounted by means of an external transportation device; the rack (2) comprises a rotating shaft (5), a support rod (6), and a fixing frame (7); the upper end of the telescopic rod (8) is rotatably mounted by means of the fixing frame (7), and the lower end of the telescopic rod (8) is rotatably mounted by means of the support rod (6); the telescopic rod (8) is electrically connected by means of an external power supply; the rear end of the support rod (6) is rotatably mounted on a side end of the fixing frame (7); the ditching body (3) comprises a fixing disc (9), a sliding groove (10), a discharge spout (11), a fixing block (12), a shovel head (13), and a belt pulley (14). By increasing the soil discharge height and distance, the rotary ditcher reduces the probability of discharged soil falling back into a ditch, and thus improves the ditching efficiency.
A: A seeding and ditching connection structure, comprising a mounting support (1), and a seeding mechanism (2) and a ditching mechanism (3) that are mounted on the mounting support (1). The seeding mechanism (2) is detachably mounted on the mounting support (1); the seeding mechanism (2) comprises a seeder mounting rod (21) and multiple seeders (22) mounted on the seeder mounting rod (21); a connection support (41) is provided on the mounting support (1); a mounting portion (42) is provided on the end of the connection support (41) distant from the mounting support (1); a mounting recess (43) having an upward opening and used for mounting the seeder mounting rod (41) is formed on the mounting portion (42); a clamping plate member (44) and a locking structure (45) for locking the clamping plate member (44) are further comprised; a clamping opening (441) is formed on the clamping plate member (44); a receiving region for receiving the clamping plate member (44) is formed between the mounting portion (42) and the mounting support (1). The connection structure improves the dismounting and mounting efficiency when a single person dismounts and mounts the seeding mechanism.
B: A surface runoff ditch digging apparatus for a wastewater treatment wetland, comprising an elliptical main supporting frame (1), front chopping wheels (4), and a ditch digging plate (10); there are two sets of front chopping wheels (4), and each set of front chopping wheels (4) is separately fixed on a shaft; the two shafts form a V shape; a V-shaped sharp corner is mounted at the front end of the main supporting frame (1); the other end of each shaft is separately mounted on a supporting bearing (5); the supporting bearings (5) are symmetrically mounted on the main supporting frame (1); a drive device (6) for the front chopping wheels (4) is mounted at the front end of the main supporting frame (1); wheels (3) are further mounted on the main supporting frame (1); the wheels (3) support the main supporting frame (1); the wheels (3) are driven by a drive mechanism (7) so as to drive the main supporting frame (1) to move on the surface of a wastewater treatment wetland; the ditch digging plate (10) is mounted at the rear end of the main supporting frame (1) by means of a supporting rod (11). By means of the surface runoff ditch digging apparatus for the wastewater treatment wetland, the front chopping wheels (4) first clean vegetation on a wetland, and then the ditch digging plate (10) is used to dig a ditch, and thus, automatic operation is achieved without manual operation.
C: A convenient and sanitary defecation device for the aged lying in bed. The defecation device comprises a defecation structure (1) for the aged lying in bed; the defecation structure comprises a support (2) and a peristaltic main body (3); the peristaltic main body (3) is rotatably mounted by means of the support (2); the support (2) comprises an handle (4), a connecting rod (5), a rotating shaft (6), a support body (7), and a leather hose (8); the front end of the handle (4) is rotatably mounted to the upper end of the connecting rod (5); the lower end of the connecting rod (5) is fixedly connected to the rear end of the rotating shaft (6); the rotating shaft (6) is rotatably mounted to the rear end of the support body (7) by means of insertion; the rotating shaft (6) runs through the support body (7); the upper part of the leather hose (8) is fixedly mounted by means of the support body (7); the peristaltic main body (3) comprises a first rotating disc (12), first magnets (13), a U-shaped pressing ring (14), a second rotating disc (16), and second magnets (17); the first magnets (13) are uniformly and fixedly connected to the front end of the first rotating disc (12); the first magnets (13) are embedded into the inner wall of the first rotating disc (12); the first rotating disc (12) is located on the inner side of the U-shaped pressing ring (14). The device allows the defecation work to be manually carried out, and thus use requirements can be better satisfied.
D: A sprayer for an agricultural machine, comprising a spraying structure (1) for a fruit garden. The structure comprises a first motor (6) and a second motor (16), the first motor (6) and the second motor (16) being electrically connected by means of an external power supply. The structure further comprises a base (2), a middle tube (3) and a top tube (4), the top tube (4) being slidably mounted on an inner wall of the middle tube (3), the middle tube (3) being slidably mounted on an upper portion of an inner wall of the base (2), and the base (2) comprising a first gear ring (5), a cylindrical housing (7), a gas receiving tube (8) and a water receiving tube (10). The first gear ring is rotatably mounted on an upper end of the cylindrical housing, the first motor is fixedly mounted by means of the cylindrical housing, a rotor of the first motor is meshed and mounted on an outer end of the first gear ring, the gas receiving tube is fixed on a lower outer wall of the cylindrical housing, an inner space of the cylindrical housing is connected to an inner space of the gas receiving tube, and the water receiving tube penetrates through the cylindrical housing. The solution can increase the basic height of the spraying, and better satisfy the use requirements.
Answer: A