COMPLEX FOR EXTRACTION OF CONCRETIONS Russian patent published in 2009 - IPC E21C50/00 

FIELD: mining.

SUBSTANCE: installation for extraction of concretion consists of base vessel, of sludge pump with suction and outlet branches, and of pressure pipeline connected by means of flange with outlet branch. Also sizes of openings of a perforated branch are accepted as equal to minimal size of extracted concretions. The pressure pipeline is directed vertically. By means of a cartridge the above water part of the pipeline is hinged on the end of the lifting jib of the swing crane assembled on the base vessel; the pressure pipeline is intended to be lifted, lowered and displaced in horizontal plane. The upper part of the pipeline is connected with a concretion receiving facility by means of a flexible hose. A cantilever swivel framework is arranged on the lower part of the pipeline and is designed to rotate relative to the pipeline in horizontal plane. Kinematically the framework is connected with the drive of its rotation. Vertically oriented in cross section and symmetrically arranged relative to the suction branch two blades are secured to the framework from below; the blades are designed to rest on the bottom of water area, to grip concretions and to transfer them to the suction branch. Each of blades is profiled in plane along logarithmic spiral with pole coinciding with the axis of the suction branch. Also an external relative to the suction branch edge of the blade and its lower edge are bent to the side of the framework rotation. The blade adjoins the suction branch with a minimal gap in plane. Parametres of logarithmic spiral defining profile of each blade are chosen from ratio: φ^-1 ln(ρ a^-1)<f, where φ - is instantaneous angular coordinate, rad, ρ - is instantaneous radius, m, a -scale factor equal to ratio of linear and angular rates at logarithmic spiral profile plotting, m, f - is coefficient of sliding friction of concretion with host rock along internal surface of the blade. The suction branch is made in form of a truncated cone expanding downward. The concretion receiving facility is made in form of an inclined grid iron where from free from water concretions are reloaded to movable containers, while under the grid iron there is located a sump.

EFFECT: simplification and reduction in cost of structure of complex and facilitation of partial load mode of concretions extraction.

5 cl, 4 dwg