Procedure for under water development of rock
SUBSTANCE: invention refers to mining and can be implemented for under water development of rock. The procedure for under water development of rock consists in excavation, in piling rock on an ice floe, and in transporting the ice floe to a place of stock piling on basin bottom. The basin is limited with a dam constructed up to a coastal strip and having an opening from the side of the ice floe transported with rock. Further, the ice floe is driven to negative floatability. When part of the basin is filled with ice floes with rock, the opening is blocked; rock is excavated upon melting and supplied to a concentrating installation erected on a shore. Further, ice floes with rock are stacked in an adjacent part of the basin divided with a common dam between the basins.
EFFECT: raised efficiency, reduced power consumption for transport operations, and reduced ecological damage to water medium caused with mining operations.
The present invention relates to mining and can be used for underwater mining of minerals.
There is a method of underwater storage of rocks, including the formation around the perimeter on the ice the sides with a closed air cavity between them and laying the rock mass on an ice floe bringing it up to negative buoyancy and landing on the bottom of the reservoir in the form of frozen grantholder array (SU 1797660 A3, AS 50/00, 41/00).
The closest to the essential features of the present method is a method of underwater storage of rocks, which is that on the ice along its perimeter to form ground-ice object with a positive buoyancy in the development of rock mass in a container with a closed air cavity. In the outer wall of the containers vorgelegt elements. The area bounded by these vessels served the rock mass. Then the ice is moved by water to the place of storage. Flooding of ice carry out the filling of water through the openings formed by the elements (SU 1712612 A1, AS 50/00).
However, when using the prototype environmental damage occurs, due to the unlimited space of the aquatic environment when stacking rocks on the bottom of the reservoir.
The purpose of this method is the higher is their performance, reducing energy consumption for the operations of transportation and reduce the environmental damage to the surrounding aquatic environment mining.
This is achieved by the fact that in the way of underwater mining of minerals, including excavation and laying of rocks on the ice, moving ice floes to the place of storage at the bottom of the reservoir, and then bringing the ice to negative buoyancy, water, restrict the dam, built to the coastal edge and having an aperture, the movement of the ice with a rock, after completing this part of the reservoir of the ice with rock opening cover, rock after thawing out and served to the beneficiation plant, located on the shore, and further storing ice with rock are carried out in the adjacent portion of the reservoir, divided by the total a dam.
The dam is being constructed to limit water body from the harmful impacts of mining, and to provide in the coastal zone designated storage rocks produced at relatively great depths. The opening in the dam provides transportation of ice with rock. Limited reservoir is divided into parts by using a total of dam and at least fill one part of the reservoir rock, carry out warehousing in the adjacent portion of the reservoir for nepreryvnog the process of transportation, of the filled part of the reservoir after thawing remove minerals and served on ore processing plant, located on the shore. In the adjacent part of the reservoir and the process repeats.
The way underwater mining of minerals is illustrated by drawings, where figure 1 shows a diagram of the underwater storage gruntilda objects; figure 2 - the same, top view.
The scheme includes an ice floe 1 with a closed air vessel. Formed ice container filled with rocks, forms gruntovedenie object 2, which is towed to the location of the underwater storage of the tow 3 wire 4 with the anchor 5 and sink to the bottom of the reservoir 6. Dam of 7 protects the coastal zone 8. The dam contains an aperture 9, that can be carried gruntilda objects, which after filling in a limited part of the reservoir cover. Wreck of minerals 10 after natural thawing process take on ore processing plant 11. Adjacent portions of the reservoir is divided into two parts with a total of dam 12.
The method is as follows.
Extracted from the bottom of the minerals are placed on an ice floe 1. Then formed gruntovedenie object 2 is transported by tug 3 rope 4 anchor 5 to place the underwater storage on the bottom of the reservoir 6 in the coastal zone 8, which ograda the t dam of 7, with the opening 9, which provides delivery gruntilda objects in the fenced portion of the reservoir. Flooded gruntovedenie objects and stacked compactly within the defined area of the bottom of the reservoir 6 is formed underwater bottom, where minerals 10 after thawing of the coastal zone 8 are removed and delivered to a processing installation 11. As you fill one part of the reservoir rock implementing storage in the adjacent portion of the reservoir for the continuous process of transportation by the General dam of 12 between the reservoirs.
The use of the proposed method will improve performance, reduce energy costs for operations for transportation and to reduce environmental damage to the surrounding aquatic environment mining.
The way underwater mining of minerals, including excavation and laying of rocks on the ice, moving ice floes to the place of storage at the bottom of the reservoir, and then bringing the ice to negative buoyancy, characterized in that the reservoir is restricted by a dam built to the coastal edge and having an aperture, the movement of the ice with a rock, after completing this part of the reservoir of the ice with rock opening cover, rock after thawing out and served on Obogatitelniy the th installation located on the shore, and further storing ice with rock are carried out in the adjacent portion of the reservoir, divided by the total dam.
SUBSTANCE: invention relates to floating walking equipment. Proposed apparatus comprises housing, walking engine consisting of case and guide mechanisms supported by opposed rockers. Said housing accommodates two sets of guide mechanisms, one comprising four (1-3-5-7) said mechanisms and another four (2-4-6-8) said mechanisms interacting between themselves and with drive components to turn cross beams. Proposed method consists in displacing supports of opposite arms in rectilinear motion of guide mechanisms. Proposed method differs from known ways in that supports are lifted with advanced vertical turn of cross beams.
EFFECT: expanded performances.
4 cl, 11 dwg
SUBSTANCE: invention refers to mining operations from bottom of seas and oceans, which are mainly represented with horizontal and slightly inclined deposits of small thickness. Concretion development device includes frame, actuating device in the form of chain-and-bucket circuit, delivery slurry pipeline, displacement floats with support elements interacting with hydraulic cylinders, silo with inclined grizzly grate. In rear part of frame there located are displacement floats and support elements in the form of piles which have the possibility of vertical movement, and which also contribute to the frame being turned in horizontal plane. At that, front part of frame is provided with travelling equipment made in the form of wheel pair with individual drive of each one.
EFFECT: providing automatic operating device used under severe mining and hydrogeological conditions, and excavation of concretions with minimum disturbance of the state of bottom sediments.
2 cl, 3 dwg
SUBSTANCE: four independent blocks are preliminary constructed at plant or shipyard and are completed with corresponding to their design equipment by workers and engineers. Further the blocks are transported to a licensed deposit place of arctic shelf by means of ice-breakers and tugboats. In the coastal region erectors-constructors mount two auxiliary blocks, notably: a military-frontier base and medical-hotel centre, while the other two blocks are directed under their own power and are rigged in underwater conditions over the place of drilling. All blocks are connected between them with electric cables and pipelines. According to this method the underwater drilling rig is made in a pressure tight case. On both opposite boards the case is equipped with submarines with hatches and sluices for small underwater mechanisms. Also an auxiliary block is set next to the drilling block by means of anchors. The auxiliary block is similar to the drilling block by design, but inside it is equipped with facilities for preparation of drilling agent and for purifying bore mud; it is also equipped with facilities for cleaning of sewer-pipe drainages of all blocks. All blocks are connected between them with electric cables and pipelines. The underwater blocks are made in form of pressure tight cases rigidly mounted on fore body and stem of each of submarines; the said hatches and sluiced are arranged in them. The disclosed method of development facilitates improved treatment of viscous oil of shelf at mini-oil processing plant located at direct vicinity from the place of extraction, which considerably improves economic performances of deposit development.
EFFECT: upgraded safety and convenience of drilling operations in remote sparsely populated northern latitudes at development of shelf hydrocarbon deposits, considerable simplification of proper development process, reduced labour intensiveness of construction and mounting directly at place of development using existing facilities of ship-building plants for construction of such complexes at their justified updating.
3 cl, 8 dwg
SUBSTANCE: dredge consists of pontoon, working element, loading chute, dredging barrel, concentrating equipment, unloading chute, pebble stacker and eofel stacks. Also pebble stacker is installed on the pontoon and is designed to rotate in horizontal plane, while tail parts of eofel stacks are designed to rotate in horizontal plane.
EFFECT: increased efficiency of placer development with dredges and reduced losses of mineral in inter-pass massifs.
SUBSTANCE: group of inventions is related to underground production of minerals, and may be used in mining industry. Method for selective sampling and preliminary concentration of ferromanganese burrs includes displacement of getting device to the bottom, capturing burrs at the bottom, their transportation with the help of drum to zone of unloading and supply to hopper. Besides underpressure zone is created at drum shell, where ferromanganese burrs are captured, retained and transported to the area of underpressure zone ending, with further unloading to hopper under their gravity force. Device for method realisation comprises above-water floating facility, transporting element, bottom getting device in the form of drum. Getting device is arranged with longitudinal grooves at external surface of drum, having through holes at the ends of grooves. Shell with through cone-shaped holes evenly arranged along their whole surface and oriented with their base outwards is installed on drum. Holes are proportionate to captured concentrate. Drum is installed on side disks displaced relative to end to its centre, and is fixed on support table. Immobile header is rigidly connected to support table, and the header has shape of sector equal to 3/4 of circumference and is oriented symmetrically relative to horizontal axis in direction opposite to motion. Header is installed inside drum, between its end and side disk, and in zone of contact with surface of drum, there is an elastic low-friction coating on header. Support table is installed on vertical hydraulic cylinders mounted on skis. On skis there is also a hopper arranged in the form of truncated cone and electric motor in oil bath with pump connected to header by means of nozzle network.
EFFECT: elimination of direct dependence of efficiency on width of buckets, elimination of dead rock lift, production of nonmagnetic minerals, improvement environmental condition in zone of ferromanganese burrs deposits development.
2 cl, 6 dwg
SUBSTANCE: submerged extractive instrument includes bottom mining aggregate, containing taking-out modules, installed by means of force-summing element - frames on durable suction flue, fixed on submerged bearing, and bottom bearing-chair. Taking-out modules are installed on bottom ends of force frames, installed movable around and lengthways durable vertical suction flue, fixed on submerged hydraulic mounting with regulated positive and negative flotation ability. Frames and taking-out modules are connected to drives with ability of movement and turn in vertical plane and stepping turn around vertical suction flue, and also regulated movement and turn of taking-out modules relative to frames. Bottom bearing-chair consists of vertical suction flue with fixed on its bottom end reference element. Operation method of extractive instrument is in development with loosening and raking of solid mass of minerals by means of movement of taking-out modules by developed surface with turn under angle of slope to it. Development is implemented on protected by screen circular surface area. Movements of taking-out modules is implemented in radial directions from suction flue to periphery - at loosening and in opposite direction - at raking into latticed container with simultaneous crushing of solid particles against webbing of its lattice, and with periodic stepping turn of them around suction flue.
EFFECT: increase of effectiveness, reliability and environmental safety of production works implementation.
15 cl, 24 dwg
SUBSTANCE: invention is intended for bottom sediment (silt) removal from water pools and for underwater development of mineral resources (sapropel) and bulk materials (sand, gravel, gold placers). Aggregate for bottom sediment removal from pools and underwater development of mineral resources includes bottom sediment conveying device mounted on floating medium and consisting of cylinder linked to pipe string, hollow piston installed inside the cylinder, linked to bar string and featuring channel with funnel-shaped section widening towards intake end and closed by shutoff valve. The floating medium carries conveyor device drive maintaining reciprocal movement of bar string. Aggregate is equipped with V-shaped cutter attached to aggregate opposite of aggregate course direction and serving for cutting mineral deposit layer and concentrating it at intake area. Filter with brushes and rods is attached to the cylinder to prevent large particles from penetrating under valve.
EFFECT: enhanced friability of caked mineral deposits, extended functional capacity and producing efficiency of aggregate.
SUBSTANCE: invention refers to hydraulic mechanisation and can be implemented at development of placers of minerals of high density in underwater working faces. The scraper-suction screen of the dredger consists of a pipeline and of a suction head with the screen. The screen contains a rigid disk with radial slits and a central impermeable circle. Each radial slit is connected to the suction head with a leak proof channel of alternate shape in cross section, also total area of radial slits does not exceed area of cross section of the suction head. The suction head is equipped with a rotation drive. Scraper blades with cutting edge and stiffening ribs set off relative to axes of radial slits at angle of 20-25° are assembled on the rigid disk below between radial slits.
EFFECT: increased efficiency of development of placer sands and reduced losses of valuable components of high density.
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
FIELD: transportation; pipeline.
SUBSTANCE: device for production of burrs includes basic vessel, sludge pump with suction and discharge nozzles, discharge pipeline, which is connected by flanges with outlet nozzle and discharge pipeline. At that sizes of perforated nozzle openings are accepted as equal to minimum size of produced burrs. Discharge pipeline is oriented vertically. Above-part of pipeline with the help of cartridge is hingedly fixed at the end of derricking rib of rotary crane installed on basic vessel, with the possibility of discharge pipeline lifting and lowering, and also its displacement in horizontal plane. Upper part of pipeline is connected by flexible hose to receiving facility for burrs. On lower part of pipeline cantilever rotary truss is installed in horizontal plane with the possibility of rotation relative to it. Truss is kinematically connected to drive of its rotation. On lower parts of truss, which are symmetrically oriented relative to pipeline, two channels of cylindrical shape cross section are fixed parallel to each other. Horizontally oriented augers equipped with drives of their rotation are installed in channels in bearings. Augers are installed so that they may grasp burrs from water area bottom and shift burrs to suction nozzle of discharge pipeline. Every groove covers auger on top with clearance, on one side on arc of 180 degrees, and on the other side - at 90 degrees. At that larger arc is installed from the side that is opposite to direction of truss rotation. Longitudinal axes of augers in plan are installed on both sides from pipeline axis at the same distance from it on truss parts that are opposite relative to pipeline. Channels of augers are connected to suction nozzle, which is arranged in the form of truncated cone that widens down. Every channel from the side opposite to direction of truss rotation is arranged with slot cuts arranged one behind another along channel length with their lift with bend upwards to the side of suction nozzle and channel overlapping along height equal to auger diametre. Width of slot cuts is accepted as less than minimum size of burrs commercial grain. At that length of every slot cut measured along channel length is accepted as more than step of auger vanes helical surface. Receiving facility for burrs is arranged in the form of inclined fire grate with the possibility to load dehydrated burrs from it into movable containers. Sump is installed under fire grate.
EFFECT: simplification and cheapening of device design and provision of partial load mode for burrs.
4 cl, 4 dwg
FIELD: mining industry.
SUBSTANCE: device has bottom power assembly, connected to base watercraft by force pipeline with conical perforated portion, adjacent to bottom power assembly, conical perforated portion of force pipeline is made of sheet of elastic material and provided with rigid branch pipes with flanges on both ends. Flanges of branch pipes are interconnected by round-link chains placed along flanges perimeter, which are connected to flanges of power assembly and force pipeline branch pipe.
EFFECT: simplified construction, lower costs, higher efficiency.
4 cl, 4 dwg
FIELD: mining industry.
SUBSTANCE: mining combine has extraction means, on which a body is mounted, having at least one first liquid outlet, for supplying liquid to material. Pipeline, through which liquid is fed to first liquid outlet, contains means for measuring flow and/or pressure of liquid in pipeline, for determining, in which of to layers outlet is positioned. Combine can have at least one second liquid outlet, placed in such a way, that first liquid outlet is in lower layer, and second liquid outlet is placed in upper layer. First liquid outlet can have one of multiple first liquid outlets spaced from each other, and second liquid outlet - one of multiple spaced from each other second liquid outlets. Efficiency of liquid flow through multiple spaced first outlets can surpass those of multiple spaced from each other second liquid outlets. Placement of second liquid outlet in separate body cover is possible. First and second liquid outlets can be directed downwardly relatively to direction of mining combine displacement. Method for controlling depth of position of mining combine extraction means includes placing two liquid outlets, interacting with material extraction means, in a material, while second liquid outlet is placed above first liquid outlet, liquid is fed to first and second liquid outlets and flow and/or pressure of liquid is measured. Layer, wherein liquid outlet lies, is detected, and first liquid outlet is placed in lower layer and second liquid outlet is placed in upper layer, to determine depth of position of extraction means relatively to two layers.
EFFECT: higher precision.
2 cl, 9 dwg
FIELD: means for organic and chemical fertilizers obtaining, particularly to extract sapropel silt from lake and lagoon bottom and for water ponds cleaning.
SUBSTANCE: device comprises water-craft with executive tool and with extraction tool of suction type, transportation mechanism and optional equipment. Executive tool comprises turbofan, bell-shaped case with serrated lower edge and at least two pipelines mounted in the case and used for feeding compressed air and driving extraction tool. Optional equipment includes hoisting means and seriously connected accumulator vessel, bin, sump, evaporator, disperser, pelletizer, drying chamber, metering device and transportation mechanism.
EFFECT: reduced sapropel mass losses, reduced time of sapropel preparation to use.
FIELD: technologies for extracting concretions from sea bottom.
SUBSTANCE: complex has watercraft, extracting machine with take-in device and pulp-pump, supporting pipeline, perforated branch pipe with sizes of apertures less than minimal size of extracted concretions. Perforated branch pipe is positioned at portion of force pipeline adjacent to extracting machine, and is provided with flanges. Apertures of perforated branch pipe are made in form of multi-drive slit channels along whole length of perforated branch pipe, provided with bandages. Slit channels can be made in form of constant width and directed along generatrix lines of perforated branch pipe, and bandages are positioned in direction perpendicular relatively to perorated branch pipe. Slit channels can be made in form of portions serially positioned behind one another and expanding towards movement of hydraulic mixture. Slit channels can be made of spiral shape, an bandages - in form of longitudinal rods.
EFFECT: higher efficiency.
4 cl, 4 dwg
FIELD: technologies for extracting concretions from sea bottom.
SUBSTANCE: device has watercraft, extracting device with collecting means and pulp-pump, force pipeline, perforated branch pipe with sizes of opening less than minimal size of extracted concretions. Perforated branch pipe is positioned in portion of force pipeline adjacent to extracting device and is provided with flanges, and diameter of perforated branch pipe decreases away from extracting machine. Extracting machine is provided with additional pump with latch, mounted in parallel with pulp-pump of extracting machine, and between perforated branch pipe and force pipeline check valve is positioned.
EFFECT: higher efficiency.
FIELD: mining industry, particularly for obtaining minerals from underwater.
SUBSTANCE: plant comprises frame carried by catamaran, drum reels secured to frame at different levels and provided with driving means. Arranged in lower frame base is vessel having chute in which auger is installed. The auger is provided with drive. Frame drums are connected to truck through endless chains to which buckets are hinged. Load cavities of the buckets have orifice arranged from end side thereof and adapted to remove water when buckets move over water surface. Lower bases of the buckets are connected with chains through flexible rods and maintain vertical positions of loads arranged on chains when chain inclination varies. Plant also has compressor connected to float chambers of the buckets by flexible armored tube secured to electric winch rope and by spring. Electric winch is linked with microswitches by electric circuit. Microswitches are adapted to automatically bring electric winch into electric circuit during bucket movement. Catamaran is connected to truck platform through ropes of the winch connected to ship and adapted to lower or lift the truck from ocean bottom. Electric drives of the winches are linked with switch buttons of control panel, which provides remote winch control. Installed in catamaran body are devices to separate concretion mass into fraction and to dehydrate thereof. The devices are made as rotary netted drums with different orifice diameters. The drums are coaxial and spaced apart one from another. Each drum is provided with receiving chamber, drive and fraction outlet. Each fraction outlet is connected to centrifugal means having drive. In accordance to the second embodiment plant has case including three or more frames arranged in staggered order in two rows and centrifugal means. The plant is made as trailed unit and may be unitized with ship. The case is provided with floating pontoon supports. Each pontoon support is connected to compressor and has electromagnetic valve so that the support may immerse the case at proper depth in stormy conditions and emerge thereof after storm termination. Two longitudinal vessels provided with chutes are connected to each frame. Installed in chutes are augers with drives. Shafts with drum reels and drives are secured from both vessel sides at different levels thereof. The drums are provided with endless chains to which buckets are hinged. In accordance with the third embodiment the plant comprises case having three or more frames. The frames are arranged in one or two rows and connected one to another. One longitudinal vessel in secured to each frame. The vessel is provided with chute in which auger with drive is installed. The plant also has case installed on truck, which is mounted on ocean bottom. Conveying wedge-like mechanism is fixedly secured in front of conveyers under truck platform. The wedge-like mechanism is movably installed between drum reels to shift concretion layer from two sides towards bunker bucket loading means.
EFFECT: increased capacity, reliability and durability, improved technical means, workmanship and extended technological capabilities.
3 cl, 16 dwg
FIELD: obtaining minerals from underwater, particularly hydro-mechanized devices for concretion production from seabed.
SUBSTANCE: device comprises movable seabed unit with pulp pump and outlet pipe, pressure pipeline with perforated part, basic ship and connection flanges. The perforated part is formed of parallel pipes connected with outlet pipe of the pulp pump and with pressure pipeline by distribution pipes. Number of pipes and pipe diameter are determined from where D1 is diameter of outlet pulp pump pipe, D2 and n - diameter and number of pipes composing perforated part of pressure pipeline.
EFFECT: increased productivity.
FIELD: rock mining, particularly to develop gravel-sand deposits.
SUBSTANCE: rid comprises body made as U-shaped pontoon and having docking mechanism, which provides connection of similar pontoon sections to maintain floatability thereof in the case of suction head weight increasing. The rig also has suction head made as downhole hydraulic mining tool and having ground receiving means and portal crane for ground receiver lifting and lowering arranged in front pontoon part. The ground receiver is lifted and lowered by suction head rotation about axle arranged in central pontoon part. The rig also has sludge line connected to suction head.
EFFECT: possibility of mining work performing at variable development depth.
FIELD: mining, particularly to produce ore and rock materials, for instance building materials.
SUBSTANCE: mining rig comprises pontoon with suction head having sludge receiving means, as well as crane for sludge receiving means lifting and lowering installed in front pontoon part. Sludge receiving means is lifted and lowered by suction head rotation about axle connected to pontoon. Rig comprises sludge line connected to sludge channel of suction head. The pontoon has U-shaped cross-section and is provided with additional crane arranged in rear part thereof. The suction head is made as downhole hydraulic tool having string composed of two parts in length direction. The parts are pivotally connected one to another. The string is arranged on pontoon so that the parts may be lowered in series. The cranes are portal. The axle is located in rear or front pontoon part.
EFFECT: possibility of mining work performing at variable development depth.
FIELD: methods to develop underwater and flooded ferromanganesian concretion and phosphate shelf concretion deposits, as well as similar flooded and marine deposits mainly including horizontal and flat thin seams located on bed surface.
SUBSTANCE: draghead comprises frame body with upper, lower, side and rear walls, suction pipe of suction dredge, blades secured to intermediate bottom, which may rotate in vertical plane. The draghead is also provided with hydraulic abrasing unit having pressure pipe transversal to upper frame body wall. The pressure pipe is provided with hydraulic heads. The draghead comprises ball-and-socket hinge arranged in upper frame body orifice. Upper horizontal edge of rounded side wall is connected to inner surface of upper wall. Side wall flat part height and rounded part height thereof are related as 1:0.5. Ball-and-socket hinge and rounded part of side frame body have curvature radii in plane view equal to active suction dredge suction radius. Intermediate bottom is installed inside rounded side wall of frame body and may rotate with the use of two hydraulic cylinders about horizontal pin secured to rounded part of side frame body wall.
EFFECT: simplified structure and reduced losses in sludge lines.