Please select the most similar patent number from A, B, C and D. Which number is?
An environmentally friendly household garbage can, comprising a can body (1). A bottom box (2) is mounted on a bottom surface of the can body (1); an anion generator (3) is mounted in the middle of an inner cavity of the bottom box (2); a storage battery (4) is mounted on a side of the anion generator (3); fans (5) are respectively mounted on two sides of the inner cavity of the bottom box (2); dust screen covers (6) are respectively arranged on two sides of a surface of an outer wall of the bottom box (2); a touch time delay switch (7) is mounted in the middle of the surface of the outer wall of the bottom box (2); a baffle (9) is mounted at the top of a surface of a side wall of the can body (1); a transverse rod (10) is arranged on a side of the bottom of the baffle (9); and a side wall of an end of the transverse rod (10) is provided with an insertion rod (11). An air purification effect is achieved by means of the anion generator and the fans; the transverse rod and the insertion rod co-operate so as to store a standby garbage bag, thereby facilitating use by workers; by means of the transverse rod, the insertion rod can be supported such that the insertion rod can store a garbage bag, thereby facilitating use by workers; and the baffle can achieve a certain protective effect, thereby maintaining the hygiene of the garbage bag.
A: Disclosed is a novel environmentally friendly trash bin, comprising an upper bin body and a lower bin body (1, 2). An upper part of the upper bin body (1) is provided with a trash inlet (11), and a top cap (12) is provided at the top of the upper bin body (1). Cross bars (13) are symmetrically and horizontally arranged on the periphery of the upper bin body (1). Vertical supporting rods (14) are connected to outer ends of the cross bars (13). The lower bin body (2) is arranged under the upper bin body (1). The lower bin body (2) comprises a base (21), and a cavity for storing trash is provided in the base (21). An umbrella-shaped trash collection plate (3), which can be flattened and folded upward, is arranged on the periphery of the base (21). A driving mechanism is arranged in the base (21) and the driving mechanism is connected to the collection plate (3). The driving mechanism is controlled by a trash collection system. The novel environmentally friendly trash bin has the beneficial effects that trash falling around the trash bin due to the carelessness of pedestrians can be automatically collected, the urban environment can be beautified, and the workload of sanitation workers can be reduced. Trash on the periphery and top of the trash bin can be collected at the same time, and collection can be completed once without manual operation.
B: A workpiece cleaning device, comprising a cleaning tank (1). A partition (2) is mounted on a side of the middle of an inner cavity of the cleaning tank (1); a bracket (3) is mounted on the left side of the bottom of the inner cavity of the cleaning tank (1); a waterproof electric rotary disc (4) is mounted on the top surface of the bracket (3); a spraying mechanism (5) is respectively mounted on the left side wall of the inner cavity of the cleaning tank (1) and the left side wall of the partition (2); the spraying mechanism (5) is composed of a portal frame (501), a transverse rod (502) and a high-pressure nozzle (503); a water pump (6) is mounted on the left side of an outer wall of the cleaning tank (1); limiting blocks (7) are respectively mounted at the bottom of the right side wall of the inner cavity of the cleaning tank (1) and at the bottom of the right side wall of the partition (2); a grid frame (8) is mounted at the top of the limiting blocks (7); ultrasonic vibrating plates (9) are respectively mounted at the top of the right side wall of the inner cavity of the cleaning tank (1) and at the top of the right side wall of the partition (2); and an ultrasonic generator (10) is mounted on the right side of the outer wall of the cleaning tank (1). The workpiece cleaning device performs pre-treatment on a workpiece by means of the spraying mechanism, and then performs secondary cleaning on the workpiece by means of the ultrasonic vibrating plates and the ultrasonic generator, thereby improving the workpiece cleaning quality and efficiency.
C: Provided is an environmentally friendly and energy-saving cutting machine, comprising a base (1) and a vertical post (2), the vertical post being welded to one side of a top surface of the base; a cutting mechanism (3) is mounted on the top of the vertical post, the cutting mechanism comprises a support frame (301), a second fixing ring (5) is welded to one end of the vertical post, and the second fixing ring is connected to a first fixing ring (310) by means of a tension spring (4); a cutting slot (6) is disposed on one side of the surface of the base, bearing blocks (7) are welded symmetrically to the bottom surface of the base, a dust collection box (8) is provided at the center of the bottom surface of the base, and support panels (9) are welded on the tops of two side walls of the dust collection box. In the present cutting machine, a material on the base can be cut, and shavings in a protective cover can also be suctioned out so as to be able to reduce the pollution from the shavings, and by means of a second dust exhaust tube, a vacuum can be externally connected, thereby improving the efficiency of dust suctioning by the dust collection box, which can reduce environmental pollution and also reduce the harm to a worker&#39;s body caused by the shavings.
D: A wastewater sampling device, comprising a sampling barrel (1), a barrel cover (2), a water intake pipe (3), and a water outlet pipe (4), the barrel cover (2) being mounted on the surface of the top of the sampling barrel (1), the water intake pipe (3) being inlaid and connected to the surface of the top of the barrel cover (2), the water outlet pipe (4) being inlaid and connected to the bottom of the right side of the sampling barrel (1), a bottom plate (5) being mounted on the surface of the bottom of the sampling barrel (1), a rotating mechanism (6) being disposed on the bottom of an inner cavity of the sampling barrel (1), the rotating mechanism (6) comprising a bracket (601), a counterweight ring (7) being mounted on the surface of the bottom of the bottom plate (5), a control mechanism (8) being mounted on the top of an inner cavity of the counterweight ring (7), the control mechanism (8) comprising a waterproof box (801), and a first sealing cover (301) being rotatably connected to the surface of the top of the water intake pipe (3). By means of the rotating mechanism (6), the inflow of wastewater from the water intake pipe (3) can be accelerated and wastewater can be rapidly discharged from the water outlet pipe (4), thereby facilitating personnel to guide wastewater into or out of the sampling barrel (1), increasing the wastewater sampling efficiency and achieving a rapid waste discharge function.
Answer: A