Please select the most similar patent number from A, B, C and D. Which number is?
An energy-saving and environment-friendly pickling device and a strip treatment system using the energy-saving and environment-friendly pickling device. The pickling device comprises a pickling tank (102); at least one end of the pickling tank (102) is a liquid isolation end (103), the liquid isolation end (103) is provided with a bearing dam (1031) and a liquid blocking dam (1032), the bearing dam (1031) extends upwards from the tank bottom, the liquid blocking dam (1032) extends downwards from the tank top, the bearing dam (1031) and the liquid blocking dam (1032) respectively extend to a position near a strip moving channel, and the strip can pass through a gap between the two dams; or, the gap between the bearing dam (1031) and the liquid blocking dam (1032) is smaller than the thickness of the strip, and the bearing dam (1031) and/or the liquid blocking dam (1032) are/is elastic dams. By providing the liquid isolation end composed of the bearing dam (1031) and the liquid blocking dam (1032), high-speed jet flow does not need to be used for performing liquid sealing on acid liquid at the two ends of the pickling tank (102) any more, a large amount of acid fog cannot be generated, and acid consumption and the cost of subsequent acid fog treatment are reduced.
A: A suitcase. A first connecting strip (401) extending toward an top suitcase (102) is provided on the inner wall of a bottom suitcase (301) of a suitcase body (101), and the bottom of the top suitcase (102) is provided with a second connecting strip matched with the first connecting strip (401); the second connecting strip comprises a first connection portion (1031) and a second connection portion (1032), and an inversed L shape is enclosed by the first connection portion (1031) and the second connection portion (1032); one side of the first connecting strip (401) is abutted against the first connection portion (1031), and the top of the first connecting strip (401) is abutted against the first connection portion (1031); a filling space is enclosed by the first connection portion (1031), the first connecting strip (401), and the top of the bottom suitcase (301), a wrapping strip (103) is filled in the filling space, and the wrapping strip (103) is sewed by means of a silk thread. Therefore, a suitcase that sliding and placing are stable and use and transportation costs are low is provided.
B: An electronic speed controller assembly comprises a first electronic speed controller (101) for driving a first motor (202), a second electronic speed controller (102) for driving a second motor (203), and a radiator assembly (103) provided between the first electronic speed controller (101) and the second electronic speed controller (102). The first motor (202) and the second motor (203) are used to respectively drive an upper propeller (2011) and a lower propeller (2012) to generate lifting forces. The first electronic speed controller (101) and the second electronic speed controller (102) are arranged in an inverted manner. The radiator assembly (103) comprises a radiator main body (1031), a heat-conducting metallic member (1032), and a heat dissipation pipe (1033). The heat-conducting metallic member (1032) and the heat dissipation pipe (1033) are mutually connected and provided at the radiator main body (1031). The first electronic speed controller (101) and the second electronic speed controller (102) are respectively in contact with the heat-conducting metallic member (1032) to transfer generated heat to the heat-conducting metallic member (1032), thereby solving problems in which prior art electronic speed controllers have&lt;u/&gt;poor heat dissipation performance, low maintainability and excessively large sizes. Also disclosed are a power system and an unmanned aerial vehicle.
C: An impeller type paper money temporary storage mechanism comprises a transmission component (101), an impeller component (102), a temporary storage area (103) and a roller component (104). The transmission component (101) is used for conveying paper money to the impeller component (102), and comprises an upper belt transmission mechanism (1011) and a lower belt transmission mechanism (1012); the upper belt transmission mechanism (1011) and the lower belt transmission mechanism (1012) construct a transmission channel; the temporary storage area (103) comprises a baffle plate (1031) and a temporary storage channel (1032); the baffle plate (1031) is connected with the temporary storage channel (1032), is arranged between the temporary storage channel (1032) and the impeller component (102), and is used for intercepting paper money from a transfer channel in the temporary storage channel (1032). With upper and lower belt transmission channels additionally arranged, the matching relation between the conventional paper money channel and an impeller is improved, the collision between paper money and the impeller can be reduced, the probability of money sticking and money flying is further lowered, and the accuracy and the efficiency of paper money stacking are increased. A paper money processing device and an automatic teller machine including the impeller type paper money temporary storage mechanism are also disclosed.
D: Provided is a strip-steel mixed-acid pickling system, comprising a multi-stage rinsing and scrubbing tank (3), a plurality of mixed-acid pickling tanks (1, 2), and a hot air dryer (17) used for drying the strip steel after cleaning; each of the mixed-acid pickling tanks (1, 2) and the plurality of rinsing and scrubbing tanks (3) in the multi-stage rinsing and scrubbing tank (3) are arranged in sequence along the direction of conveyance of the strip steel; the mixed-acid pickling tank (2) located at the end of each of the mixed-acid pickling tanks (1, 2) is docked with the rinsing and scrubbing tank (3) at the first position of the multi-stage rinsing and scrubbing tank (3); the hot air dryer (17) is arranged on the side of the rinsing and scrubbing tank (3) at the end of the multi-stage rinsing and scrubbing tank (3) away from the mixed-acid pickling tank (1, 2). The strip-steel mixed-acid pickling system uses a multi-stage rinsing and scrubbing tank (3) and a plurality of mixed-acid pickling tanks (1, 2) to treat strip steel, to obtain clean strip steel, which is then dried by means of a hot air dryer (17), such that the strip steel can be applied to the subsequent process more quickly, improving operating efficiency.
Answer: D