| 摘要 |
PROBLEM TO BE SOLVED: To provide a truck mixer capable of checking infiltration of rainwater into a mixing drum by closing a cover of a ready-mixed concrete input port of a hopper during rainfall. SOLUTION: In this truck mixer having the hopper 3 on the drum inlet side for introducing ready-mixed concrete into the mixing drum 1 by receiving the ready-mixed concrete supplied from a ready-mixed concrete plant, the concrete mixer truck is characterized by arranging a cover device 5 for opening and closing the ready-mixed concrete input port 6 of the hopper 3.
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