VACUUM MACHINE DRAG HEAD FOR HYDRAULIC STRUCTURE, SUBSTANTIALLY CHANNEL, CLEANING OF SILT Russian patent published in 2007 - IPC E02B3/02 E02B15/00 

FIELD: stream regulation, for instance breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow, particularly for hydraulic structure cleaning of thin silt layers.

SUBSTANCE: drug head comprises body with rake structure, sucking channels in rake structure radially connected with sucking pipe orifice and valves made as flexible strips mounted along body perimeter. Flexible strips of the valves are cut in several tapes along lengths thereof. The tapes have equal thickness and are arranged in the body. The tapes have orifices located over body edge in front of sucking channels. Additional valves made as similar overlapped flexible strips are located around body perimeter in flexible strip connection areas. Edges of main and additional valves are on single level and located below body edge and rake structure spike surfaces. Support rolls may be mounted on the body.

EFFECT: increased efficiency of silt removal from hydraulic structure surface due to increased output and extended field of device application.

2 cl, 5 dwg