Please select the most similar patent number from A, B, C and D. Which number is?
A striking sheet of an icebreaking rod can be hinged on supporting seats evenly distributed on an outer periphery of the icebreaking rod, and comprises an S-shaped smooth curve bended connecting arm (1), which may be a curved-surface plate-shaped arm or rod-shaped crank arm. A removable striking blade device is arranged on the head portion of the S-shaped smooth curve bended connecting arm, and the tail end of the connecting arm is connected with a shaft sleeve (2) and a damping limiting device (5) matched with the shaft sleeve. The striking sheet of an icebreaking rod can reduce the impact force of an icebreaking blade on a hinged shaft and the supporting seats, disperse the impact force borne by the connecting arm and prolong service life. The icebreaking blade is removable, so that using cost is reduced, and maintenance cost is reduced.
A: Provided is a bogie wheelset radial mechanism with a structure which is of adjustable rigidity. The mechanism is composed of front and rear secondary frames (21) which are pin-connected via two connecting rods (22) arranged in a crosswise manner. The connecting rods (22) are pin-connected to the secondary frames (21) via round pins (24). Joints between the round pins (24) and the connecting rods (22) and/or joints between the round pins and the secondary frames (21) are provided with replaceable elastic materials. The joints between the round pins (24) and the connecting rods (22) and/or the joints between the round pins and the secondary frames (21) are provided with rings (23) made of the replaceable elastic materials. End portions of the connecting rods (22) are embedded into mounting grooves (25) located in the secondary frames (21) and are pin-connected to same via the round pins (24). The end portions of the connecting rods (22) are located on an upper mounting plane (31) or a lower mounting plane (32) of the secondary frames (21) and are pin-connected to same via the round pins (24). By providing the replaceable elastic materials, which have buffering and damping effects, impact forces between the round pins (24) and the secondary frames (21) and between the round pins (24) and the connecting rods (22) are effectively reduced, thereby further improving the use reliability of the secondary frames (21) and the connecting rods (22), and reducing the risk of structural failure of each part.
B: A multi-roller and multi-shaft combined de-icing apparatus comprises three rolling and scraping de-icing rollers(1), a working apparatus bracket (2), a fixed portal frame (5), a lifting portal frame (6), a buffering pull rod (7), and an oil cylinder (8). The fixed portal frame (5) is fixed on a vehicle frame; the lifting portal frame (6) is in sliding fit with the fixed portal frame (5); the working apparatus bracket (2) is hingedly connected to the lifting portal frame (6); the rolling and scraping de-icing rollers are mounted at a lower end of the working apparatus bracket (2) by using shock absorbing springs (14) and arranged on three shafts in two rows; the buffering pull rod (7) is disposed in the middle of the fixed portal frame (5); two ends of the buffering pull rod (7) are hingedly connected to the fixed portal frame (5) and the working apparatus bracket (2), respectively; and two ends of the oil cylinder are hingedly connected to the fixed portal frame (5) and the lifting portal frame (6), respectively. The apparatus can adapt to arc roads, uneven roads, and bumpy roads, and can swing left and right or forward and backward, to better profile the ground, thereby removing ice cleanly and greatly reducing shock in a cab. The apparatus is a multi-roller and multi-shaft combined de-icing apparatus that has both functions of ensuring physical and psychological health of a driver and de-icing compacted snow.
C: Disclosed is a deck carrier used in polar region, comprising a main hull (1), and a bow (2) and a stern (3) located at two ends of the main hull (1); the angle between a flare (4) of the bow (2) and the horizontal plane is a, wherein a = 13-25º. The angle between the flare (4) of the bow (2) and the horizontal plane is designed to be 13-25º, and thus when the deck carrier is sailing in polar region, the flare (4) of the bow (2) can continuously crush and break the ices, and the resistance encountered in icebreaking is reduced, enabling rapid icebreaking in the large-load navigation process without the need of an icebreaker performing icebreaking forwardly.
D: An electric tool, comprising: a striking shaft (11) comprising a striking end (1111) capable of reciprocating in a first axis (200) and capable of striking a nail (100) during movement, a striking surface (1123) contacting the nail (100) being formed on the striking end (1111); an impact mechanism (10) for impacting the striking shaft (11) to reciprocate; a motor (21) for driving the impact mechanism (10); and a housing (50) for supporting the striking shaft (11), the impact mechanism (10) and the motor (21); the impact mechanism (10) comprises an impact block (12) on which an impact surface (1122) for contacting the striking shaft (11) so as to output an impact force to the striking shaft (11) is formed, and a support shaft (70) for supporting the impact block (12); a force receiving surface for contacting the impact surface (1122) to receive an impact force outputted by the impact block (12) is formed on the striking shaft (11); and when the impact surface (1122) contacts the force receiving surface to perform impacting, the ratio of the area of the surface of the force receiving surface that contacts the impact surface (1122) to the area of the striking surface (1123) is equal to or greater than 0.5 and equal to or less than 20.
Answer: B