Please select the most similar patent number from A, B, C and D. Which number is?
A chopper assembly, comprising a straw discharge channel and a straw inlet and straw discharge port (10p) that are located at both ends of the straw discharge channel; a movable cutter roller (1r), which is disposed inside of the straw discharge channel; a plurality of movable blades (2r), which are distributed in a spiral arrangement and are detachably mounted on the movable cutter roller (1r), each of the movable blades (2r) being parallel to the cross section of the movable cutter roller (1r); a fixed cutter holder (3r), which is provided inside of the straw discharge channel on the side of the movable cutter roller (1r) proximal to the straw inlet; a plurality of fixed blades (4r), which are disposed on the fixed cutter base (3r) at equal intervals in the same direction; and a scattering structure, which is disposed on the straw discharge port (10p) and is suited to evenly scattering crushed straw. When the movable cutter roller (1r) is driven to rotate to any position, it can be ensured that all of the movable blades (2R) are able to pass through the gaps between the fixed blades (4r), that is, a cutting state can consistently be maintained between the movable blades (2r) and the fixed blades (4r), and the chopping efficiency is improved under the usual rotational speed of the movable cutter roller (1r), thus reducing the power output costs due to increasing rotational speed. Meanwhile, straw can be prevented, by means of the scattering structure, from accumulating in farmland.
A: A fiber-grinding machine comprising a machine frame (1), and, fixed to the front and back ends of said frame (1) respectively, an electric motor (2) and a machine body (3); a shaft (4), which rotates to the left and to the right, is provided in the middle of said machine body (3); axially fixed to said shaft (4) are a plurality of moving-blade rings (5); multiple rows of strip-shaped moving blades (51) are circumferentially fixed to each of said moving-blade wheels; multiple rows of fixed blades (61) are fixed to a fixed-blade block (6); each row of said moving blades (51) comprises left moving blades and right moving blades (511, 512) provided to the left and to the right relative to one another; the right ends of said left moving blades (511) and the left ends of said right moving blades (512) are tangentially offset in opposite directions relative to one another; adjacent rows of left and right moving blades (511, 512) are offset in opposite directions relative to one another; the distance between the bottom end of said moving blades and a sandwich mesh (7) is 3-5 cm. The present fiber-grinding machine, by increasing the number of fixed blades and adjusting the cutting angle of the fixed blades and moving blades, substantially increases yields as well as product fineness; the addition of a fixed-blade connection plate to the fixed-blade block forms a joint fastening having a safer, more secure hold and reduced safety risks.
B: Disclosed is an adjustable moving blade thread-trimming mechanism of a short-thread-end roller-feed sewing machine. The mechanism comprises a kettle shaft middle sleeve (1), a kettle shaft (2), a moving-blade holder (3), a moving blade (4), a fixed blade (5), a rotating shuttle (6) and a machine needle (7), wherein the kettle shaft (2) is installed in the kettle shaft middle sleeve (1); the moving-blade holder (3) is installed on the kettle shaft middle sleeve (1); the moving blade (4) is installed on one side of the moving-blade holder (3); the fixed blade (5) is arranged on one side of the moving blade (4); the rotating shuttle (6) is installed above the kettle shaft (2); and the machine needle (7) is arranged above the rotating shuttle (6). The moving blade and the moving-blade holder of the thread-trimming mechanism are of a split structure, such that machining is convenient, the machining cost is low, the machining precision is easier to guarantee, and the position of the moving blade can be adjusted at will according to requirements, so that installation and adjusting are convenient, thus, the optimal thread hooking and trimming effects are achieved; and when the rotating shuttle is worn, the moving blade can be adjusted, and it is then possible to continue using the rotating shuttle, such that the service life cycle of the rotating shuttle is prolonged, and user costs are reduced.
C: An integrated device for crushing and vapor-steaming medical waste enables fast maintenance and repair and has a replaceable blade, and is a detachable vertical structure that is integrally assembled. The device is integrally formed as one piece by three parts: a loading and stirring compartment (1), a crushing compartment (2), and a sterilizing and unloading compartment (3). The crushing compartment is installed with a movable blade assembly and a stationary blade assembly therein. Maintenance gates (2-3) are disposed at two sides of the crushing compartment. The maintenance gate of a crushing machine and a bearing seat (2-9) of a movable blade shaft (2-2) of the movable blade assembly are designed as one piece, and a stationary blade (2-7) of the stationary blade assembly is pressed by a pressing plate (2-8) onto an inner wall of the crushing compartment, and screws for securing the pressing plate are installed outside in. To maintain or replace the blade of the crushing machine, the maintenance gate is detached such that the replacement process of a movable blade (2-6) of the movable blade assembly can be completed outside the crushing compartment; furthermore, the operator only needs to loosen the tightening screws of the pressing plate outside the crushing compartment and does not need to enter the machine to replace the stationary blade. The present invention addresses the problems in which the replacement of the blade of the crushing machine requires a hoisting device to hoist out the entire blade roller of the crushing machine, or requires the compartment to be removed, or requires the operator to enter the compartment, thus improving working efficiency and preventing the operator from entering a dangerous area.
D: Disclosed is a lawn mower (100), comprising: a machine casing (1) provided with a cutting cavity and a grass discharge passage (15); a stop plate (41) which is mounted on the machine casing (1) and has a closing position for closing the grass discharge passage (15) and an opening position for opening the grass discharge passage (15) ; and a driving member (42), the driving member (42) being capable of driving the stop plate (41) to be switched between the opening position and the closing position, and when the driving member (42) is in linkage with the stop plate (41) to rotate to the opening position, the stop plate (41) being located outside the grass discharge passage (15).
Answer: D