Please select the most similar patent number from A, B, C and D. Which number is?
A safety device for a food processor comprises a push cylinder (1), a receiving cup (3) fixedly connected to a cup cover (2), a main cup body (4), and a main device body (5). The receiving cup (3) is locked to the main cup body (4). A guiding push rib (11) is provided on the sidewall of the push cylinder (1). A guiding slide groove (31) is provided on the sidewall of the receiving cup (3). A safety push block (7) is sleeved inside the guiding slide groove (31). A safety push rod (8) is provided on the sidewall of the main cup body (4). After the push cylinder (4) is pushed inside the receiving cup (3) for a certain depth, that is, the push cylinder (1) completely covers the cup opening of the receiving cup (3), the safety push rod (8) is pushed downward and triggers a safety switch (6) of the main device body (5), and the motor inside the main device body (5) is started, thereby preventing a hand from entering the cup running at a high speed to get injured.
A: An electromagnetic clutch for a safety protection device of a press machine comprises an upper case body (5) and a lower case body (6). An upper iron core (1) is disposed in the upper case body (5). The upper end of the upper iron core (1) passes out of the top surface of the upper case body (5). A coil (4) is sleeved on the upper iron core (1). A socket base (7) is disposed on a side wall of the upper case body (5). An aerial socket (8) connected to the coil (4) is disposed in the socket base (7). A T-shaped lower iron core (2) is disposed in the lower case body (6). The lower end of the lower iron core (2) passes out of the bottom surface of the lower case body (6). A pressure spring (3) is disposed between the T-shaped top end of the lower iron core (2) and the bottom surface of the lower case body (6). The pressure spring (3) is sleeved on the external surface of the lower iron core (2). Copper sheathing is omitted in the upper and lower case bodies of the electromagnetic clutch, thereby avoiding fixing the electromagnetic clutch to the body of the press machine, saving a plurality of mounting accessories, thereby reducing the cost of the product and facilitating the installation and maintenance of the product. When the upper and lower iron cores are bound, the electromagnetic clutch moves up and down as a whole, and when the upper and lower iron cores are separated, only the lower iron core moves downward, thereby prolonging the service life of the electromagnetic clutch.
B: A milk foam kettle for heating, foaming and stirring liquid food, which comprises a cup body (1) and a base (2). A stirrer (3) and a positioning sleeve (16) are arranged on the cup body (1); a heater (5), a heat-transfer plate (18) and a fixed sleeve (21) are arranged on the base (2); the positioning sleeve (16) is sleeved in the fixed sleeve (21) on the base (2); a driving device (7) for driving the stirrer (3) to rotate is arranged under the heater (5); and a driving motor (8) is provided in the driving device (7). According to a magnetic force principle, the cup body (1) for containing liquid milk is fully separated from a working circuit for driving the stirrer (3), a heating device and the driving device (7); during use, the liquid milk is free from seeping into the base (2) to influence the circuit and a lubricant of the driving motor (8) cannot flow into the cup body (1) to contaminate the liquid milk as well, so that the milk foam kettle is hygienic and safe. Pole directions of a driving magnet (9) and a driven magnet (10) are both horizontally arranged, so that the space is saved; the stirrer (3) is driven by a magnetic force, thereby being hygienic and safe; and the stirrer (3) is only located in the cup body (1), so that the stirrer (3) can be more conveniently disassembled and cleaned.
C: A multi-functional antimicrobial cup, comprising a cup body. The cup body comprises a cup bottom (1) and a cup wall (2) surrounding and enclosing the cup bottom (1). The cup wall (2) is detachably provided with a cup lid (3) thereon. An inner wall of the cup lid (3) is provided with a rubber ring (4) in contact with the cup wall (2). An antimicrobial part (5) is provided on an outer wall of the cup lid (3). The rubber ring (4) and the antimicrobial part (5) are both coated with an antimicrobial film (6) containing silver ions and tungsten ions. During use of the cup, the cup lid (3) covers the cup wall (2), such that while the antimicrobial film (6) on the rubber ring (4) on the inner wall of the cup lid (3) is in contact with the cup wall (2), an active substance in the antimicrobial film (6) rapidly sterilizes the cup wall (2), and the effect is prolonged to provide an antimicrobial effect to the cup body during use. When a user holds the antimicrobial part (5) on the cup lid (3) in their hands, the silver ions or tungsten ions in the antimicrobial film (6) on the antimicrobial part (5) quickly sterilizes the hands without leaving chemical residue, thereby providing convenient and safe use.
D: A syringe, comprising: an outer sleeve (1), a guide-resistive ring (9) being arranged on the top part thereof; a pushing cylinder (2) movably arranged inside the outer sleeve (1), a pushing cylinder cavity being disposed inside the pushing cylinder (2); a sliding device (5) slidably arranged inside the pushing cylinder cavity; a locking base (3) detachably arranged on the sliding device (5); a needle tip (33) detachably mounted on the locking base (3); and a shaped liquid-proof ring (4) sleeved over the locking base (3) in an adjustable position, in order to clamp or release the locking base (3); a pushing part (20) arranged on the top end of the pushing cylinder (2) can push the liquid-proof ring (4) to move into a guide-resistive accommodating cavity (28) formed by the outer sleeve (1) and the guide-resistive ring (9) in order to release the locking base (3); after the locking base (3) and the sliding device (5) are locked, the locking base (3) is driven by the sliding device (5) to drive the needle tip (33) to retract into the pushing cylinder cavity.
Answer: B