Please select the most similar patent number from A, B, C and D. Which number is?
A damming machine for stacking sandbags at a dike breach for preventing flood, comprising two driving wheels (1), a driving axle housing (2), a sandbag bucket (3), an operating platform (4), and a cantilever (5); one end of the cantilever (5) is provided on a rotary table base controlled by a host of the operating platform (4), and the other end thereof is hingedly connected to a power arm (6); the power arm (6) comprises a telescopic arm (62) and a hydraulic cylinder (61) provided at one end of the telescopic arm (62); a piston rod of the hydraulic cylinder (61) is connected to the telescopic arm (62); the end of the power arm (6) is provided with a damming mechanism; the damming mechanism comprises a rotary table (63) provided at the other end of the telescopic arm (62) and a blocking base (64) provided on a rotary base of the rotary table (63); a support base (65) is provided on the blocking base (64), and is provided with a sandbag conveying mechanism; the sandbag conveying mechanism comprises a guide base (7) matching the support base (65) and a moving mechanism sliding along a guide slot of the guide base (7); a transmission mechanism is provided above the guide base (7). The damming machine can quickly and efficiently stack a plurality of sandbags continuously at a time without moving the position of a host of the damming machine. The damming machine is simple to operate, convenient to use and high in efficiency.
A: A vehicle driving direction control device having a power receiving function, comprising a lateral deviation swing arm mechanism, the lateral deviation swing arm mechanism comprising a main transmission arm (1), a telescopic secondary transmission arm (2), a rotating drive mechanism that drives the main transmission arm (1) to deflect horizontally and a lifting drive mechanism that drives the main transmission arm (1) to move vertically; and one end of the telescopic secondary transmission arm (2) is hinged to the main transmission arm (1). The device further comprises a guiding block (3) provided at an end part of the main transmission arm (1), and the guiding block (3) is provided thereon with a guiding clamping groove (4) that slidingly cooperates with a guide rail (5). The device further comprises a positive electrode power receiver (6) and a negative electrode power receiver (7) provided on the guiding block (3). The driving direction of a vehicle is guided by means of the guiding block (3) moving along the guiding rail (5) so that the existing non-rail driving of the vehicle is transformed to a combination of non-rail driving and rail driving, thereby solving the technical problems wherein driving stability is influenced by a deflecting power receiving device provided on a vehicle and wherein a driver must control the driving direction.
B: Disclosed are a pin plugging/unplugging mechanism and a cylinder head thereof, and a pin-type telescopic arm and a crane with the pin-type telescopic arm. The pin plugging/unplugging mechanism comprises: a telescopic oil cylinder disposed in a telescopic arm (100), an active end of the telescopic oil cylinder being provided with a cylinder head (1); an arm pin (5) slidably disposed on a side wall of an arm tail of the telescopic arm (100); a return mechanism used for keeping the arm pin (5) in an extended and locked state; and a swing bar (3) hinged to a side wall of the telescopic arm (100). A cylinder pin (2) used for being locked with the telescopic arm (100) and an arm pin push rod (7) for pushing the arm pin(5) to unlock are disposed at both sides of the cylinder head (1). A guide mechanism used for guiding the arm pin push rod (7) and the cylinder pin (2) to move is disposed in the cylinder head (1), and the guide mechanism is connected to a driving mechanism. For the pin plugging/unplugging mechanism, an arm pin oil cylinder, a dovetail groove structure, and a poking fork structure on the cylinder head of the oil cylinder are cancelled, so that the structure of the cylinder head of the oil cylinder becomes simpler; a mechanical failure of the cylinder head part is reduced; the guide mechanism drives the cylinder pin and the arm pin push rod to perform interlocking, thereby improving the reliability of an interlocking mechanism; and the manufacturing difficulty and processing cost of the cylinder head of the oil cylinder are reduced.
C: Disclosed are a pin insertion and extraction mechanism, an inserted pin type telescopic boom and a crane. The pin insertion and extraction mechanism comprises a telescopic oil cylinder provided in a telescopic boom (100), wherein the movable end of the telescopic oil cylinder is provided with a cylinder end (1), and two sides of the cylinder end (1) are provided with a cylinder pin (2) for locking with the telescopic boom (100). The pin insertion and extraction mechanism further comprises: a boom pin (5) slideably provided on a side wall of the telescopic boom (100), and used for locking to another telescopic boom when sliding to extend; a return mechanism (6) for retaining the boom pin (5) in an extended state; and a rocker lever (3) hinged by means of a fixed shaft to a side wall of the telescopic boom (100), one end of the lever being connected to the boom pin (5) and the other end being able to be pushed by the cylinder pin (2). In the pin insertion and extraction mechanism, providing a boom pin, a return mechanism and a rocker lever providing lever action on the two side walls at the tail of the telescopic boom means that when an ejector rod of the cylinder pin is extended, the boom pin is retracted and when the ejector rod of the cylinder pin is retracted, the boom pin is extended, thereby switching between the cylinder pin locked state and the boom pin locked state. The mechanism not only has a simple structure, is convenient to set up and has fewer essential components, but also reduces the machining complexity of components such as the cylinder head, etc. as well as reducing the installation accuracy of components such as the boom pin, etc.
D: Provided is a device for quickly binding flood prevention sandbags, which comprises a base (1), wherein a sandbag clamp (2) is arranged on the base (1), a binding mechanism (3) is arranged right above the sandbag clamp (2), and the binding mechanism (3), through a suspension arm (4), is connected to a lifting rod (5) arranged on one side of the sandbag clamp (2). The invention can rapidly and effectively bind a plurality of sandbags together, performs simple binding by means of winding, and adds to the overall weight of the dropped sandbags in the form of a sandbag combination, avoiding the scenario where a single sandbag would be washed away thereby not being able to block a breach, saving on rescue time at the scene.
Answer: D