Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a normal-pressure milk-filling machine, comprising a liquid storage tank (1), a filling valve (2), a main shaft (3), a bottle tray (5), a bottle input shift wheel (6), a bottle output shift wheel (7), a lifting device (9) and a transmission device (10), wherein the filling valve (2) is fixedly mounted at a bottom end of the liquid storage tank (1), and the bottom end is adapted thereto; the liquid storage tank (1) is fixedly mounted on the main shaft (3); the bottle tray (5) is arranged around the main shaft (3); a guide plate (8) is mounted at the bottom of the bottle tray (5); the bottle input shift wheel (6) and the bottle output shift wheel (7) are symmetrically arranged on the guide plate (8), and the bottle input shift wheel (6) and the bottle output shift wheel (7) are adapted to each other; a frame (4) is arranged below the guide plate (8), and the lifting device (9) and the transmission device (10) are mounted in the frame (4); the bottle tray (5) is sleeved over and adapted to the lifting device (9); and the main shaft (3) passes through the frame (4) and is connected to the transmission device (10). The normal-pressure milk-filling machine has a simple and rational structural design, can precisely control the humidity and temperature of the liquid storage tank (1), and has excellent pipe sealing performance. A lifting rod (9-3) can drive a bottle tray rod (9-1) to lift without deviation, and a lifting rod slide sleeve (9-5) does not produce friction when lifting in a bottle tray rod sleeve (9-2).
A: A plastic sheet equidistant cutting device for the chemical industry, comprising a worktable (1). Four corners on a bottom end of the worktable (1) are fixedly connected to support legs (2). A conveyor belt (3) is fixedly arranged in the middle of the top end of the telescopic worktable (1). A lifting/lowering plate frame (4) is fixedly arranged on the top end of the worktable (1) located on the side of the conveyor belt (3). A sheet hopper (5) is fixedly arranged on the side of the worktable (1). The tail end of a rotating shaft of a transmission wheel on one end of the conveyor belt (3) is fixedly connected to a first stepper motor (7). A second stepper motor (8) is fixedly arranged in the middle of the top end of the lifting/lowering plate frame (4). A ball screw (9) is provided inside the lifting/lowering plate frame (4) along the central axis. The top end of the ball screw (9) penetrates through the top end of the lifting/lowering plate frame (4), and is fixedly connected to the tail end of a rotating shaft of the second stepper motor (8). An outer wall of the ball screw (9) is threadedly connected to a lifting/lowering table (10). A fixed shaft (12) is fixedly arranged in the middle of both ends of the lifting/lowering table (10). The tail end of the fixed shaft (12) is fixedly connected to a fixture base (13). The plastic sheet equidistant cutting device for the chemical industry is simple and reasonable in structure, has a novel design, and has high equidistant cutting efficiency in plastic sheet equidistant cutting.
B: Intelligent filling equipment and a filling method thereof. The equipment comprises a bottle feeding mechanism (1), weighing parts (2), filling needle parts (3) and a bottle discharging mechanism (4), and further comprises a transfer mechanism (6); the weighing parts (2) are provided at the bottle feeding end of the bottle discharging mechanism (4); the filling needle parts (3) are provided above the weighing parts (2); the bottle discharging mechanism (4) is provided with a buffer platform (41); the bottle feeding end of the bottle discharging mechanism (4) and the buffer platform (41) are oppositely arranged at two sides of the weighing parts (2). The filling method comprises the steps of: S1, bottle feeding; S2, bottle taking; S3, bottom pushing and bottle placement; S4, filling: performing the next bottle taking by means of the transfer mechanism (6), first weighing empty medicine bottles by the weighing parts (2) and then starting filling, keeping weighing during filling until the filling amount reaches a target value, and performing the next bottle pushing and bottle placement by means of the transfer mechanism (6) after the filling is finished; and S5, repeatedly performing step S4 until the filling of all the medicine bottles is finished. The intelligent filling equipment has a compact structure and facilitates the improvement of the filling precision and product yield.
C: An agricultural digging apparatus, comprising a base (1), wheels (2), a push handle (4), a lifting support (5), a first motor (6), a guide plate (7), an elliptical cam (8), a contact wheel (9), a lifting rod (10), a fixing block (11), a spring (12), a connecting plate (13), etc. The wheels (2) are mounted at the bottom of the base (1), a through hole is formed in the middle of the base (1), a left end of the base (1) is provided with the push handle (4), and the top of the base (1) is provided with the lifting support (5); a right side of the lifting support (5) is provided with the first motor (6) and the guide plate (7), the first motor (6) is provided above the guide plate (7), and the elliptical cam (8) is mounted at an upper portion of the first motor (6). The agricultural digging apparatus can quickly dig a pit in the ground, and has high digging efficiency, and saves time and manpower.
D: An electronic component welding apparatus for circuit board production, comprising a bottom plate (1); a support column (2) is mounted on the bottom plate (1), a first sliding groove (3) is provided inside the support column (2), a lifting/lowering device (4) is mounted inside the first sliding groove (3), a first support plate (5) is mounted at the top of the lifting/lowering device (4), a rotating motor (6) is mounted inside the first support plate (5), and a fixing device (7) is mounted on the rotating motor (6); a rack (8) is mounted at an edge portion of the bottom plate (1), a top plate (9) is mounted at the top of the rack (8), a second sliding groove (10) is provided beneath the top plate (9), a sliding block (11) is provided inside the second sliding groove (10), a hanging rod (12) is mounted at the bottom of the sliding block (11), and a welding head (13) is mounted at the bottom of the hanging rod (12). Said apparatus has improved adaptability by modifying the fixing device (7), and can perfectly fix circuit boards when facing circuit boards of different models and thicknesses; and the lifting/lowering device (4) is attached, which allows for lifting/lowering of a placement platform only by manually controlling a rotating handle (47), being convenient and quick.
Answer: B