Please select the most similar patent number from A, B, C and D. Which number is?
A lock latch, comprising: a lock latch module and a driving module; the lock latch module comprises a pull latch (3) mounted on a first main body, and an oblique pin rack (4) mounted on a second main body and adapted to the pull latch (3), the pull latch (3) being provided with a first insertion hole (31), the first insertion hole (31) having a hole width sufficient to accommodate the oblique pin rack (4); the driving module is used for driving the oblique pin rack (4) to move transversely, such that the oblique pin rack (4) engages with or disengages from the first insertion hole (31), in a snap-in position, of the pull latch (3). Said lock latch structure can achieve the splicing of inside and outside arcs with different arcs and planar splicing without the need to be accurately processed, and said lock latch can be used for splicing the first main body and the second main body together.
A: A symmetric hot bending device for a round bamboo (24), comprising: a support (1), a first main body (2) transversely fixed above the support; two second main bodies (4), a third main body (6) vertically disposed at the middle of the first main body, an exploratory disposed on the third main body, first clamping rods (16), and a power module. Two transverse first guide rails (3) are symmetrically disposed on the first main body; the two second main bodies are respectively and correspondingly disposed in the two first guide rails; each of the second main bodies is provided with a vertical second guide rail (5); each of the second guide rails is provided with the first clamping rod; the power module is used for controlling the two second main bodies to synchronously and transversely move towards or away from each other in respective first guide rails, and is further used for controlling the two first clamping rods on the two second main bodies to synchronously move up and down in respective second guide rails; the exploratory is fitted with the first clamping rods at two sides, for use to fix and perform hot bending formation on the round bamboo.
B: An intelligent security identification device and system. The security of the intelligent security identification device and system is improved. The security identification device comprises a body part (1), a ring band part and a lock catch part. The ring band part comprises a first ring band (2) and a second ring band (3). One end of the body part (1) is connected to one end of the first ring band (2), the other end of the body part (1) is connected to one end of the second ring band (3), a first wire is arranged in the first ring band (2), and a second wire is arranged in the second ring band (3). The lock catch part comprises a lock catch connector (4) and a lock catch insertion base (5). The other end of the first ring band (2) is connected to the lock catch connector (4), and the other end of the second ring band (3) is connected to the lock catch insertion base (5). The body part (1) comprises an IC module (11). One end of the first wire and one end of the second wire are both connected to the IC module (11), the other end of the first wire is connected to the lock catch connector (4), the other end of the second wire is connected to the lock catch insertion base (5), and when the lock catch connector (4) is matched with the lock catch insertion base (5), the lock catch part, the first wire, the second wire and the IC module (11) form a circuit.
C: An arc-shaped lock catch, comprising an angle adjustment assembly (1). Two ends of the angle adjustment assembly (1) are provided with a drive assembly (2) and a locking assembly (3) respectively, one end of the angle adjustment assembly (1) is provided with a rotationally arranged arc lock seat (11), and the drive assembly (2) comprises a first drive member (21) which is disposed on the arc lock seat (11); a first transmission member (22) cooperates with the output end of the first drive member (21), and the first transmission member (22) has a first thread (221); and a second transmission member (22) is rotatably connected to the angle adjustment assembly (1), and has a second thread (231) that cooperates with the first thread (221). The arc-shaped lock catch provided by the present application drives the angle adjustment assembly (1) by means of the drive assembly (2) to rotate and adjust the angle between two adjacent LED display screen box bodies so as to achieve horizontal splicing, vertical splicing or splicing at a certain angle, and the angle adjustment, splicing and unlocking of the two adjacent LED display screen box bodies are automatically completed by means of the drive member. The operation is simple, the difficulty of the splicing operation of the LED display screen box bodies is reduced, which facilitates the assembling of an LED display screen.
D: A locking cord, lock, and backpack combined structure. The structure comprises a locking cord (1), a combination lock (2), and a backpack (3). The combination lock (2) is located at the top, the front, one side or the back of the backpack (3); the combination lock (2) is provided with a catch; one end of the locking cord (1) is fixed on the backpack (3), and the other end is provided with a puller (11); the puller (11) is fixed on the combination lock (2) by means of the catch; the backpack (3) is provided with a hidden intermediate layer (6); the hidden intermediate layer (6) is provided at the left side or the right side of, or on a shoulder strap (7) of the backpack (3); the hidden intermediate layer (6) is used for accommodating and hiding the locking cord (1); the backpack (3) is provided with zipper tapes (4); two zipper heads (5) are provided on the zipper tapes (4) for controlling engagement or opening of the zipper; each zipper head (5) is fixed on the combination lock (2) by means of a catch. The combined structure can ensure the safety of an article in a backpack and ensure the safety of the backpack.
Answer: C