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

FIELD: mining.

SUBSTANCE: invention refers to hydro-mechanised complexes for extracting concretions from sea bottom. The complex for extraction of concretions consists of a base vessel, of a pulp pump with suction and outlet branches, of a pressure pipeline connected with the outlet and suction branches by means of flanges, and of a perforated branch with dimension of holes equal to a minimal size of extracted concretions. Also the pressure pipeline is directed vertically, while its above water part is pivotally secured on the end of a derricking jib of a swing crane by means of a sleeve; the swing crane is arranged on the base vessel and is designed to lift and lower the pressure pipeline and also to transfer it in horizontal plane. The upper part of the pipe line is connected to a concretion receiving capacity by means of a flexible hose. Four pontoons of a cylinder shape are arranged on the middle part of the pipeline symmetrically relative to its lengthwise axis and along it; the pontoons are designed to be filled with water and to be blown off with compressed air. Also the pontoons are arranged on the pipeline between the flanges secured on the latter; the pontoons are connected between them and pressed to the pipeline by means of flexible bands. Cantilever swinging framework kinematically tied to its swing drive is assembled on the lower section of the pipeline; this framework is designed to rotate relative to the pipeline in horizontal plane. Two blades symmetrically located relative to the suction branch are secured to the framework from below; the blades rest on the water area bottom, grab concretions and transfer concretions to the suction branch. Notably, each of blades is made with a horizontal lower edge in cross section; an inclined part of the blade adjoins the lower edge and forms an acute angle, the vertex of which is directed to the side of blade motion; an upper horizontal edge adjoins the inclined part and is connected to it with a curvilinear section. Value of acute angle is accepted less, than the angle of friction in pair of concretion with host rock that is internal surface of the lower edge and the inclined part. In plane view each blade is profiled along logarithmic spiral with a pole coinciding with the axis of the suction branch; the external relative to the suction branch edge of the blade and its lower edge are bent to the direction of framework swing, while the blade adjoins the suction branch with a minimal circular gap in plane view. The suction branch is made in form of a truncated cone expanding downward. The concretion receiving capacity is made in form of an inclined sieve grate, wherefrom dehydrated concretions are reloaded into movable containers; a sump is assembled under the sieve grate.

EFFECT: decreased cost and simplification of design and facilitating part load mode of concretions extraction.

4 cl, 5 dwg