Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a multi-functional engraving machine, comprising a base (1), upright columns (2), an engraving platform and a cutter mechanism. The engraving platform comprises a movable platform (3) and a workpiece clamping device (4). The movable platform (3) is provided with an automatic rising-lowering platform. The automatic rising-lowering platform comprises a platform surface (5), a platform surface rising-lowering frame (6) and a platform surface automatic rising-lowering mechanism. The platform surface automatic rising-lowering mechanism is fastened on a beam in the middle of the movable platform (3). The platform surface rising-lowering frame (6) is fixed to the platform surface automatic rising-lowering mechanism. The platform surface (5) is fixed to the platform surface rising-lowering frame (6). The multi-functional engraving machine using the above-mentioned structures can enable the rising-lowering platform to perform automatic rising-lowering by means of a program code. When a plane is engraved, the platform surface rises, and when a three-dimensional object is engraved, the platform surface automatically lowers. Thereby, the present invention has a high degree of automation, and is widely used and is easy and safe to operate.
A: Provided is a lighting device for a multifunctional medical rescue platform; a table (11) has a cubic board-shaped structure; the middle position of the lower end of the table is equipped with a lifting/lowering bar (2); the central axis of the lifting/lowering bar (2) is arranged perpendicular to the lower end face of the table (11); the lifting/lowering bar (2) is assembled together with a screw-thread jack (5); the screw-thread jack (5) is mounted on a movable platform (13); casters (4) are fixed on the lower end of the screw-thread movable platform (13); a snap groove (7) is provided on the end faces of the two sides of the table (11); the table (11) is raised or lowered by means of adding to the screw-thread jack (5); such a design is convenient for medical care personnel to adjust the height according to requirements; in addition, the process of raising and lowering the screw-thread jack (5) is smooth and gradual, thus solving the problem of conventional lifting/lowering devices being overly jarring and uncontrolled; additionally, the design of the solar panel (3) is convenient for converting solar energy into electrical energy and storing it, and the design effectively addresses the problem of electrical energy; in addition, the design of the LED lamp (12) solves the problem of a conventional table (11) being unable to perform a lighting function, and the design is convenient for medical care personnel to attend to a patient.
B: A lift mechanism of an exhibition portable power distribution cabinet comprises a portable power distribution cabinet (1), a servo motor (2), a reduction drive (3), four vertical threaded rods (4), four threaded rod sleeves (5), four chain wheels (6), a chain (7), and a lift platform (8). The four vertical threaded rods (4) are arranged vertically, and lower ends of the vertical threaded rods (4) are rotatbly disposed on the portable power distribution cabinet (1). The four chain wheels (6) are fixed at the lower ends of the four vertical threaded rods (4), respectively. The chain (7) is arranged on the four chain wheels (6). Lower ends of the four threaded rod sleeves (5) are fit via openings to upper ends of the four vertical threaded rods (4) and connected using threads to the vertical threaded rods (4), respectively. Upper ends of the four threaded rod sleeves (5) are fixed at a lower side of the lift platform (8). The lift platform (8) is arranged horizontally. The lower end of one of the four vertical threaded rods (4) is connected to the reduction drive (3) and driven by the same. The reduction drive (3) is connected to the servo motor (2) and driven by the same. The lift mechanism is simple in structure, easy to operate, and implements automatic opening of the lift platform (8), saving time and effort, and ensuring safety.
C: An electric lifting platform capable of retracting upon encountering a resistance, comprising a lifting upright (1), a platform (2), a controller (4), and a manipulator (5). The controller (4) comprises a master MCU (42) and a motor driving circuit (43). An output end of the master MCU (42) is connected to the motor driving circuit (43). The electric lifting platform further comprises a multi-axis sensor module (6) configured to acquire resistance-encountering data of the platform (2). The multi-axis sensor module (6) acquires changes in platform panel motion states on different axes, thereby meeting changes in platform panel motion states caused by different collision objects at different positions. Installation position requirements are not strict, direct contact with a force-receiving surface is not required, and low-pressure collisions can also be detected. The multi-axis sensor module (6) is connected to an input end of the master MCU (42). The master MCU (42) sends a control signal to the motor driving circuit (43) after processing the resistance encountering data. The motor driving circuit (43) controls the lifting upright (1) to perform a corresponding retraction action. The lifting platform enables sensitive and rapid detection of an obstruction upon encountering the obstruction, has improved safety.
D: Provided is a three-dimensional engraving machine, which resolves the problem of inaccurate engraving in existing engraving machines; the invention comprises a machine frame and an engraving platform (17) arranged on said machine frame; a position-limiting clamp (7) used for clamping is disposed above the engraving platform (17); the machine frame comprises a base (1) and vertical columns (2) arranged at the two sides of the base (1); a transverse beam (12) connects the two vertical columns (2); the base (1) is provided with a vertical motor which drives the engraving platform (17) in reciprocating horizontal and vertical motion; the transverse beam (12) is fixedly connected between the vertical columns (2), and the parallel vertical columns (2) are provided with a horizontal lateral guide rail (11) for connection; a blade frame (8) is connected to the guide rail (11) using support plates (9). The blade may oscillate forward and backward, driven by a motor in coaxial concomitant motion, performing three-dimensional machining at various angles, thus improving engraving accuracy and making the invention suitable for complicated engraving machining.
Answer: D