Please select the most similar patent number from A, B, C and D. Which number is?
A front-back moving-type precise four-column discharging machine, comprising a rack (1). Connecting blocks (4) are provided on the left and right sides of the rack by means of two guide columns (2) and a punching oil cylinder (3). The two connecting blocks are respectively provided with punching pressure plate moving guide rails (5). A punching pressure plate (6) is slidably provided between the two connecting blocks by means of the punching pressure plate moving guide rails. Support bosses (61) are respectively provided on two sides of the punching pressure plate. The two sides of the punching pressure plate are supported on the punching pressure plate moving guide rails by means of the support bosses. The edges of the two support bosses are respectively positioned on the axes of the two guide columns. The two connecting blocks are respectively provided with support planes (41) matching the support bosses. Oil storage tanks (7) matching the punching oil cylinder are respectively provided on two sides of the rack.
A: Disclosed is a precise four-column cutting device composed of a workbench (1), a hydraulic oil tank (2), an electric motor (3), an oil cylinder (4), an upper pressing plate (5), a left trapezoid connection block (6), a right trapezoid connection block (7), a connection rod component (8), a balance shaft (9) and an oil pump (10), wherein the workbench (1) is a frame of a rectangular structure, and the frame is provided with a plurality of rib plates (11) to enhance the strength of the frame; the hydraulic oil tank (2) is arranged at the bottom of the workbench (1), and the electric motor (3) and the oil pump (10) are connected and fixed to a side vertical face of the workbench (1); and the electric motor (3) drives the oil pump (10) to drive the oil cylinder (4) to control the upward and downward movement of the upper pressing plate (5), and blanking synchronization is ensured by means of the connection rod component (8) and the balance shaft (9). The device is simple to operate and operates stably, blanking synchronization is ensured by means of the connection rod component (8) and the balance shaft (9), and four corners are balanced, thereby greatly improving the production efficiency.
B: Disclosed is an environmentally friendly oil pipe arrangement device, comprising: a support bottom plate (1), and five sumps (2) arranged on the support bottom plate (1) and connected to one another. A support block (3) is arranged at each side of a lower end of each sump (2) on the support bottom plate (1), a hydraulic cylinder (4) is arranged under the two support blocks (3), and a piston rod (5) of the hydraulic cylinder (4) is connected to the support blocks (3). A screw rod (6) is fixedly arranged at each side of an upper end of each sump (2), the screw rod (6) is provided with a thread insert (7) cooperating with the screw rod, adjusting handles (8) are arranged at two sides of the thread insert (7), a semicircular support bracket (9) is arranged at an upper end of the thread insert (7), an oil discharge pipe (10) is longitudinally arranged on the semicircular support bracket (9), and several oil feed pipes (11) are transversely arranged on the oil discharge pipe (10).
C: A flame laminating machine having high production efficiency comprises: a machine frame (1); a sponge roll unwinding device (2) and a plurality of sponge guiding rollers (21) arranged at an upper portion of the machine frame (1); and a middle laminating roller (3) arranged at a middle portion of the machine frame (1), and rotatably disposed in a middle bearing base (5) via a middle shaft (4). The middle bearing base (5) is fixedly disposed at the machine frame (1). An upper laminating roller (6) operating together with the middle laminating roller (3) is arranged at an upper portion of the middle laminating roller (3). The upper laminating roller (6) is rotatably disposed at an upper bearing base (8) via an upper shaft (7). The upper bearing base (8) is fixedly disposed at an upper support (9). Upper sliding tracks (10) are disposed at two sides of the machine frame (1). Two ends of the upper support (9) are slidably disposed at the upper sliding tracks (10) via upper sliding blocks (11). An upper screw cover (12) is disposed at an upper end of the upper support (9). An upper gearmotor (13) is disposed at an upper end of the machine frame (1). An upper screw (15) matching with the upper screw cover (12) is disposed at an electrical motor shaft (14) of the upper gearmotor (13).
D: Disclosed is a hub die-casting mould, which comprises a lower die (2), a side die and an upper die (4) which are assembled to form a hub casting cavity. The lower die (2) is arranged on a lower template (1). The side die is formed by butt jointing four arc-shaped parts (3) which are slidingly connected to the lower template (1). The four arc-shaped parts (3) are separated into two groups which are respectively located on the left and right sides of the lower die (2). An included angle between 3º - 10º is arranged between sliding traces of two arc-shaped parts (3) of each group and the diameters in left and right directions of the lower die (2). The hub die-casting mould further comprises two connecting blocks (8) respectively arranged at the outsides of the two groups of the arc-shaped parts. Connecting holes (9) are arranged on the connecting blocks (8). The outer walls of the two arc-shaped parts (3) of each group are respectively provided with pulling hooks (7). The pulling hooks (7) are slidingly connected to the connecting holes (9). By pulling two arc-shaped parts of one group by two connecting blocks, only two oil cylinders are required to drive the two connecting blocks, and the oil cylinder energy consumption in the pouring process is reduced by half. The cavity pressure is provided by means of a die locking sleeve. The limitation of the oil cylinder specification is overcome, and the manufacturing cost of the hub is reduced.
Answer: A