Please select the most similar patent number from A, B, C and D. Which number is?
Provided is an automatic pipe drilling device, comprising a machining table (16), wherein a material guide pipe (2) is fixedly installed on the machining table (16); a machining notch (17) is provided in the middle of an upper portion of the material guide pipe (2); clamping assemblies used for assisting with fixing a pipe (1) are installed on the portions, on two sides of the machining notch (17), of the material guide pipe (2); a top plate (5) is arranged above the material guide pipe (2), and the top plate (5) is fixedly connected to the material guide pipe (2) by means of first telescopic cylinders (4) arranged on two sides of the top plate; a drill rod (14) is rotatably mounted in the top plate (5), the drill rod (14) is driven by a driving mechanism arranged at the top of the top plate (5) to rotate, and a drill bit (15) is mounted at a lower end of the drill rod (14); and a plurality of telescopic grinding heads (19) are circumferentially distributed on an upper portion of the drill bit (15), and an air pump (13) used for controlling the grinding heads (19) to extend and retract is mounted at the top of the top plate (5). The drilling device has a good drilling machining effect on a pipe, and inner and outer surfaces of a hole can be ground and deburred, and same is conducive to application and popularization.
A: A sewing machine for garment production and processing, comprising a treadle-type sewing machine driving mechanism (2), supporting legs (4), a processing platform (6), and a sewing machine body (8). A driving motor (1) is mounted on the supporting legs (4), and a driving pulley (21) is mounted on an output shaft of the driving motor (1); the driving pulley (21) is connected to a driven pulley (11) mounted on a driving shaft of the sewing machine by means of a transmission belt (13); a connector (20) is further mounted at the end portion of the output shaft of the driving motor (1); a first U-shaped frame (15) is mounted on the lower side of the processing platform (6); a first sliding sleeve (16) is provided on the first U-shaped frame (15) in a matched and sliding mode; a generator (17) is mounted on the lower side of the first sliding sleeve (16), and a connecting base (19) is mounted on an output shaft of the generator (17); and manual telescopic cylinders (22) are further fixed to the supporting legs (4) and connected to the generator (17), and an illuminating lamp (7) electrically connected to the generator (17) is further mounted on the lower side of the processing end of the sewing machine body (8). According to the sewing machine, random switching between electric driving and treadle driving can be carried out, and the illuminating requirements of a working area can be ensured in a situation without electricity, such that the working progress is not influenced.
B: Disclosed is an automatic processing device, specifically an automatic grain milling apparatus comprising a machine body (16). A grinding cavity (2) and a milling cavity (19) are respectively provided on an upper portion and a lower portion of the machine body (16). A rotary tube (6) is mounted at the center of the top portion of the machine body (16). The rotary tube (6) is driven to rotate by a drive mechanism provided on an outer side of the machine body (16). Multiple grinding blades (1) are mounted on the rotary tube (6) at a lower portion of the grinding cavity (2). A two-shaft extension motor (22) is supported and fixed by means of a support assembly in the milling cavity (19). An upper milling seat (25) is mounted and fixed on an upper output shaft of the two-shaft extension motor (22). A lower milling seat (21) is mounted and fixed on a lower output shaft of the two-shaft extension motor (22). A milling recess (11) forming a clearance fit with the upper milling seat (25) is provided at the top of the milling cavity (19). The grinding cavity (2) and the milling recess (11) communicate with each other by means of a material discharge hole (7). A material filter plate (20) matching the lower milling seat (21) is further provided in the milling cavity (19). Pre-grinding, secondary milling, and air blowing are performed, thereby achieving a good grain milling effect, improving the efficiency, and facilitating promotion.
C: A board material high precision drilling apparatus for computer production, which relates to the technical field of equipment for computer production and machining. The apparatus comprises a base cabinet (1), support posts (2) are fixedly connected at two sides on the base cabinet (1), a mount ring (4) is fixedly connected at upper ends of the support posts (2), a mount cabinet (5) is fixedly connected at top parts of the support posts (2) above the mount ring (4), a separating plate (41) is fixedly connected at an upper end within the mount cabinet (5), mount posts (10) are rotatably connected within the mount cabinet (5) below the separating plate (41), cylindrical cams (6) are fixedly sleeved on the mount posts (10), mount rods (9) are fixedly connected at bottom parts of the separating plate (41) on the side of the cylindrical cams (6), rotating rods (18) are rotatably connected on the mount rods (9), an arc-shaped gear disc (8) is fixedly connected at one end of each rotating rod (18), extending and retracting cylinders (12) are fixedly connected at bottom parts of the separating plate (41) between the mount rods (9), a first mount plate (15) is fixedly connected at bottom parts of the extending and retracting cylinders (12), gear racks (11) are fixedly connected at two sides of the first mount plate (15), a second mount plate (17) is fixedly connected between the gear racks (11) below the first mount plate (15), and a drill bit (29) is rotatably connected at a bottom part of the second mount plate (17). The apparatus has a sensible structure in principle and design, operation and use are quick and convenient, and the apparatus is highly practical.
D: The present invention relates to the field of stainless steel pipe machining, and specifically to a surface polishing apparatus for a stainless steel pipe, comprising a top plate and a bottom plate base. A second support frame and a first support frame are fixedly mounted between the top plate and the bottom plate base, respectively; a polishing cylinder is rotatably mounted on the first support frame; an inner cavity is formed in the inner side of the polishing cylinder in a penetrating mode; polishing bristles are mounted on the cavity wall of the middle of the inner cavity; multiple dust suction holes are formed in the cavity walls of two ends of the inner cavity; the multiple dust suction holes are communicated with an annular cavity; a driving assembly used for driving the polishing cylinder to reciprocatingly rotate is further mounted on the first support frame; a dust removal box is further mounted on the first support frame; an exhaust fan is mounted on the dust removal box; and the exhaust fan is used for exhausting air at the two ends of the inner cavity through the multiple dust suction holes. The present invention can perform an all-around polishing operation, and can perform a synchronous and reliable dust removal operation during polishing, such that the surface polishing machining effect and efficiency of the stainless steel pipe are improved.
Answer: C