Abstract: An automatic cleaning device, comprising: a moving platform configured to automatically move on an operation surface; a cleaning module which is provided on the moving platform and comprises a wet-type cleaning module configured to clean at least a part of the operation surface in a wet-type cleaning mode and a dry-type cleaning module configured to clean at least a part of the operation surface in a dry-type cleaning mode; and a floating lifting/lowering structure connected to the dry-type cleaning module and configured to enable the dry-type cleaning module to passively move up and down relative to the moving platform.

Abstract: The present invention discloses a concrete structure used for bank protection and scour prevention of river bank and coast. Its construct is a hollow circular truncated cone and concrete flat plates are plugged on the hollow circular truncated cone. By tearing, dispersing and stirring up water flow, the energy of local water flow is dissipated, and the scouring strength of the water flow is weakened, achieving the aim of scour prevention and bank protection. It has good mechanical property, not easy to be destroyed, has good stability in water and big overhead rate, and can save materials. Compared to previous various structures for scour prevention, the present invention has better effects of energy dissipation and scour prevention. It not only can be used in bank protection and scour prevention, but also can be used for supplementary energy dissipation when plugging and closure.