Please select the most similar patent number from A, B, C and D. Which number is?
A specialized A-grade door frame surface polisher, comprising a base (1). The base (1) is provided with a door frame positioning jig (2), a robot (3), and a control box (11). The robot (3) and the control box (11) are positioned next to the door frame positioning jig (3). A rotating base (10) is installed on a rotating shaft at a terminal of the robot (3). The rotating base (10) is installed with a servomotor (5), a pneumatic grinding machine (8), and a pneumatic polishing machine (9). An output terminal of the servomotor (5) is directly or indirectly installed with an electric-powered angle grinding machine (7). An upper surface or a side surface of the control box (11) is provided with a grinding wheel wear sensor (4) for measuring the degree of wear of an angle grinding wheel. An action of the output terminal of the servomotor (5) is controlled by a feedback signal sent by the grinding wheel wear sensor (4). After the angle grinding wheel completes a task, the wheel contacts the grinding wheel wear sensor at a uniform pressure. The grinding wheel wear sensor then feeds back data to the control box. The control box controls a feed amount of the output terminal of the servomotor, performing real-time monitoring of the amount of grinding performed by the angle grinding wheel, and compensating by use of the servomotor. The invention can achieve precision of up to 0.03 mm.
A: Disclosed is an in-situ detection device for precision grinding of a ring with an inner spherical surface, the device comprising a base plate (4), a swing arm (5), a swing cylinder (6) and a precise displacement sensor (7). Further disclosed is an automatic detection method for use with the device, and the method is as follows: when detection is required in a grinding machining application, a grinding spindle system (1) automatically moves away from a ring with an inner spherical surface along a Y coordinate axis such that a grinding wheel (2) moves away from the ring with an inner spherical surface (3), the ring with an inner spherical surface and the grinding wheel stop rotating, and the swing arm swings clockwise by 90 degrees under the driving of the swing cylinder, at which point the precise displacement sensor is directly in front of the grinding wheel; the grinding spindle system moves along the Y coordinate axis towards the ring with an inner spherical surface, and when the precise displacement sensor comes into contact with a surface of the ring with an inner spherical surface, the grinding spindle system stops moving, and the distance from a position where the precise displacement sensor is at a zero point of detection to the position where the precise displacement sensor comes into contact with the surface of the ring with an inner spherical surface is recorded as the radius R of the ring with an inner spherical surface. The method achieves in-situ automatic precision detection of the dimensional precision of a workpiece with an inner spherical surface during grinding machining and has a high degree of automation.
B: Disclosed is a mechanism for automatically replacing a grinding wheel piece for an electric sander. The mechanism comprises a first machine frame (1) and a sander manipulator (2) located above the first machine frame (1), wherein two grinding wheel piece positioning units are arranged on an upper end face of the first machine frame (1); the interior of the first machine frame (1) is provided with a horizontally moving slide platform (3) and a horizontal driving unit for driving the horizontally moving slide platform (3) to move back and forth between the two grinding wheel piece positioning units; and a vertical driving unit and a vertically moving slide platform moving up and down along the vertical driving unit are arranged on the horizontally moving slide platform (3), and a nut assembly and disassembly unit (8) is arranged on the vertically moving slide platform. The mechanism for automatically replacing a grinding wheel piece for an electric sander has a simple structure and realizes the automatic replacement of a grinding wheel piece, thereby shortening the time of replacing a sanding piece and improving working efficiency.
C: A drill bit grinding machine, comprising a base (1), an electric motor box (2) arranged on the base (1), and an electric motor arranged in the electric motor box (2), wherein a grinding wheel (3) is arranged at an end of an output shaft of the electric motor; a grinding base (4) with a grinding hole is arranged on a side of the base (1) where the grinding wheel (3) is positioned; the base (1) is also provided with a regulating assembly which facilitates the movement and regulation of the grinding base (4); the grinding base (4) is fixedly connected to the regulating assembly by means of a connecting plate (5); a chuck assembly (6) for clamping a drill bit and in rotational fit with the drill bit is arranged in the grinding hole of the grinding base (4); and a regulating structure for regulating the position of the grinding base (4) relative to the grinding wheel (3) is arranged between the connecting plate (5) and the grinding base (4). The drill bit grinding machine has the advantages of easy operation and a high grinding accuracy.
D: A surface polishing apparatus for mechanical accessories, comprising a base (2) and a U-shaped frame (5). The U-shaped frame (5) is fixedly provided on the base (2). The left and right inner walls of the U-shaped frame (5) are both provided with clamping assemblies. The top of an inner cavity of the U-shaped frame (5) is fixedly provided with a guide rod (8). A waist-shaped movable frame (10) is mounted on the guide rod (8) in a horizontally slidable manner. The upper and lower inner walls of the waist-shaped movable frame (10) are each provided with a second rack (32). A polishing motor (14) is fixedly mounted at the bottom of the waist-shaped movable frame (1) by means of a motor box (16). A polishing wheel (15) is fixedly connected to an output shaft of the polishing motor (14). The top of the inner cavity of the U-shaped frame (5) is symmetrically provided with two sliding rods (9). The two sliding rods (9) are both slidably sleeved with two sliding sleeves (34). A first driving motor is fixedly provided between the two sliding sleeves (34) by means of a motor support (23). A driving gear (33) is fixedly connected to an output shaft of the first driving motor. The apparatus uses a cyclically moving polishing operation mode, and the whole process is automatically performed by machinery, thereby effectively improving the polishing efficiency and quality of mechanical accessories while greatly reducing manpower.
Answer: D