DRAG HEAD Russian patent published in 2012 - IPC E21C50/00 

FIELD: mining.

SUBSTANCE: device includes underwater vessel with atmospheric pressure, trolley, pulp line, operating element in composition of a catcher, hydraulic motor with shaft, shroud and ripper. Operating element is connected to the trolley via bracket, and pulp line is hydraulically connected to vessel with atmospheric pressure. The shroud has cylindrical shape and is mounted vertically and rigidly connected to pulp line via upper face end and to catcher via lower face end, the catcher is done in a form of confuser with circular input. Hydraulic motor of bottom-hole type is concentrically built-in the shroud cavity and rigidly connected to it via radial ribs with formation of annular through channel, and ripper is attached to the shaft of this hydraulic motor. The bracket is equipped with two joints and two hydraulic cylinders capable of moving the operating element in vertical and horizontal plains. There is a cab on the trolley that is equipped with oil pump with hydraulic rotary mechanism working on pressure drop, viewport and lamp with isolated power source. Bottom-hole motor of operating element is done with pressure and drainage channels in the housing and swinging spring-loaded dampers.

EFFECT: increase of device productivity and reliability, reduction of risk of water body contamination by ripping products.

2 cl, 4 dwg