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This invention relates to the field of water remediation technology, specifically to a piezoelectric catalytic component and a groundwater remediation system. The piezoelectric catalytic component includes: an upper part of a piezoelectric catalytic body with a spiral channel communicating with an inlet, and a lower part with a cavity; the cross-sectional diameter of the spiral channel gradually decreases from the inlet to the end; a column is provided in the cavity, and a piezoelectric film is spirally wound around the column; the end of the spiral channel is close to the piezoelectric film at the upper end of the column; the piezoelectric film receives water containing organic pollutants flowing in from the spiral channel and catalytically degrades the organic pollutants through piezoelectric conversion; this application combines the static pressure of the water flow, accelerates the water flow through the spiral channel, the flow velocity gradually increases from top to bottom, the hydraulic impact load is correspondingly enhanced, the mechanical force flowing through the piezoelectric film is increased, low-frequency vibration excites the piezoelectric catalytic effect, maximizes the catalytic degradation capacity of the piezoelectric material, and thus improves the catalytic degradation efficiency of the piezoelectric material.

The utility model relates to the technical field of special automobiles, and discloses an overhead working truck which comprises a truck body, a lifting mechanism arranged on the truck body and a swing mechanism connected to the driving end of the lifting mechanism, the lifting mechanism is used for driving the swing mechanism to adjust the spatial position, and the swing mechanism comprises a first swing arm and a second swing arm. One end of the first swing arm is rotationally connected to the driving end of the lifting mechanism around a first axis, one end of the second swing arm is rotationally connected to the other end of the first swing arm around a second axis, the first axis and the second axis are both parallel to the height direction of the vehicle body, and a working bucket is movably arranged at the other end of the second swing arm in the height direction. The operation flexibility is good, the position adjustability of the working bucket is good, and the adjustable range is wide.