Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed are a dual-drive type membrane hole-opening and seeding device and method. The dual-drive type membrane hole-opening and seeding device comprises a rack (2), and a first suspension, a disc and a second suspension which are sequentially arranged on the rack (2), wherein the disc is rotatably mounted on the rack (2), a hole-opening mechanism is provided along a circumferential edge of the disc in a matching manner, a hole-opening cam (3-7) and a seed metering device (6-2) which match the hole-opening mechanism are mounted on the rack (2), and the disc and the seed metering device (6-2) are each fitted with a driving mechanism; and when the hole-opening mechanism rotates around an axis of the disc to a position matching the hole-opening cam (3-7), the hole-opening mechanism is opened towards a side away from an end face of the disc to form a seed feeding port in communication with a seed feeding cavity in the hole-opening mechanism, and the disc can be driven to achieve active transverse hole opening at different rotation speeds.
A: Disclosed is a vertical soil-entering perforating device for pot seedling transplanting. The vertical soil-entering perforating device for pot seedling transplanting comprises a rack (1), and a vertical perforating mechanism (2), side plates (3) and a side plate reciprocating driving mechanism which are mounted on the rack (1), wherein the side plates (3) are slidably connected to two sides of the rack (1), the vertical perforating mechanism (2) is mounted on the side plates (3), and an execution end of the side plate reciprocating driving mechanism is connected to the side plates (3) so as to drive the vertical perforating mechanism (2) to perform static movement relative to the ground. Further disclosed is a perforating method. Vertical soil entering and exiting of the perforating mechanism can be guaranteed by means of the vertical soil-entering perforating device, soil sampling-type hole-forming operation is used, and disturbance to the soil around a hole can be reduced while the outline size of the hole is guaranteed to be stable, thereby improving the pot seedling transplanting quality.
B: Disclosed is a machining device for machining a plier jaw on a plier workpiece (7). The plier workpiece comprises a plier mouth (71), a plier jaw (72) and a handle (73) which are connected in sequence. The machining device comprises a base (1), a disc (2), a first drive device (3) used for driving the intermittent rotation of the disc, a clamp (4) arranged on the disc and used for clamping the plier jaw, and a plurality of machining mechanisms arranged on the base. The connecting line between the centre of the plier jaw and the clamping centre of the clamp is arranged in the vertical direction. The machining mechanisms comprise a first machining mechanism (5) used for drilling the plier jaw and a second machining mechanism (6) used for milling the upper surface of the plier jaw. The first machining mechanism comprises a drill bit (52) used for drilling. When the disc stops, the clamping centre of the clamp below the first machining mechanism coincides with the vertical projection of the drill bit on the horizontal plane. The first machining mechanism in the device is used for directly drilling the plier jaw without location alignment, saving on manual work and improving machining efficiency. The machining device can machine multiple plier workpieces at the same time, further improving the machining efficiency.
C: An electronic device for automatic acupoint selection and acupoint stimulation adopting Midnight-Noon Cycle of Qi. Inside the main body housing (5) of the device, a circuit board is connected to a microcomputer (4) and a treatment head (3), respectively. The circuit board has a function processing circuit connected to a communication circuit, a treatment head drive circuit, and a feedback circuit, respectively. The communication circuit is connected to the microcomputer. The treatment head drive circuit is connected to an electromagnetic coil. The feedback circuit is connected to the function processing circuit and the treatment head drive circuit. An hour stem and time comparison table, a time zone offset comparison table, a day stem table, and a day stem, hour stem, and acupoint comparison table are stored in a memory. The process of acupoint selection is as follows: inputting Y (year parameter), M (month parameter), d (day parameter), and C (century parameter), calculating an median to find a day stem, inputting time and a time zone to find an hour stem, and finding and displaying an acupoint. The present invention solves the problem in the existing use of Midnight-Noon Cycle of Qi of manual calculation of acupoint selection leading to inaccurate acupoint stimulation and pain resulting therefrom.
D: Provided is a precise positioning mechanism for a workstation disc; said workstation disc (1) is linked with a driving mechanism (2) by means of a speed reduction mechanism; the workstation disc (1) is fixed on a work platform (13); a fixing plate (3) is provided on the work platform (13); the fixing plate (3) is located on the outer side of the workstation disc (1) in the circumferential direction; the fixing plate (3) and the workstation disc (1) are provided with a positioning groove (10) and a positioning member (4) which are fitted to each other; the positioning member (4) comprises a fixing block (41); the fixing block (41) has an accommodating groove (42); the accommodating groove (42) is provided with a compression spring and a positioning protrusion (43); one end of the positioning protrusion (43) extends under the action of the compression spring so as to be located outside the fixing block (41); the workstation disc (1) rotates so that the positioning protrusion (43) of the positioning member (4) enters the positioning groove (10) or the positioning protrusion (43) is separated from the positioning groove (10). The mechanism can prevent the workstation disc (1) from rotating excessively or not rotating fully into place, and the positioning of a workpiece on the workstation disc (1) is more accurate.
Answer: A