Unisite Group Ltd.
Model No.: USA-227
Dimension: As Per Drawing/order
Welded Drag Head: Steel Welded Drag Heads
After-sales Service Provided: Engineers Available To Service Machinery Overseas
Type: Trailing Suction Hopper Dredger
Power Type: Diesel
Model Number: Trailing Suction Hopper Dredger
Size: Complete Range
Process: Welding, Machining
Material: S235JR-S355J2G3, Q235-Q345, HARDOX400, Grade A-D O
Packaging: bulk package and bulk vessel transportation container package and container transportation
Place of Origin: china mainland(zhejiang)
In order to dredge in waves, the Suction Pipe is suspended from special davits, which operate with heave compensation to ensure that the Drag Head nozzles stay in contact with the sea bed. The control of mixture of water and sand is done by a so-called dredge drag head visor. The visor controls the amount of water that enters along with the sand. In some cases this visor is hydraulically controlled.
Classification of drag head
Universal Drag heads
Our universal drag heads offer a combination of high excavation capabilities for loosening the soil and optimized hydraulic properties for mixture transportation. High mixture concentrations are possible in many different kinds of soil. Concentrations are more stable even in more compact soils, where the water flap is blocked in an optimized position. Production can be optimized by controlling the contact force of the drag head to the ground through a swell compensator system.
The soil to be dredged is loosened by cutting teeth at the visor and the effect of pressure water supply through special nozzles. The visor is equipped with an adjustable water flap for the supply of additional transport water when dredging in soft grounds.
US Drag heads
Our US drag heads are particularly suitable for dredging firmly-packed and strongly-binding types of soil. Due to their modular design, the US drag head can easily be converted into a drag head with a turbulence visor or a universal visor. The US visor is equipped with knives and ripping teeth to loosen compact soils. Pressure water is used for fluidization of the ground. The US visor has adjustable water inlets on top, allowing the supply of additional transport water in soft grounds. Wide drag heads are equipped with two independent visors, so that the whole suction area is in close contact to the ground even on uneven ground.
The US visor is equipped with knives and ripping teeth to loosen compact soils. Pressure water is used for fluidization of the ground. The US visor has adjustable water inlets on top, allowing the supply of additional transport water in soft grounds.
Active Drag heads
Our active drag heads offer the highest production rates possible, even in compact soils and at varying dredging depths. The pressure nozzles can be arranged at the visor carrier and/or at the visor itself according to customers' preferences. The hydraulic power pack can be installed on deck or as integrated part of the drag head. Various control systems are available, enabling efficient use of the active drag head. The basic version of the control system includes continuous position indicators and switches for bridge desk mounting. Advanced dredge control and automation systems automatically adjust the visor position and water flap. Visor position can be controlled, for instance, with constant position, pre-selected Grab depth or cylinder force and water flap position to suction pressure at the drag head.
We have a perfect managing system and quality control system which from initial work, to process control, to final control, forming the whole process traceability with a good command of quality and production schedule.
You can see the quality of all our previous orders were guaranteed based on our good procedure and service.
UniSite group has a perfect managing system and our staff who are professional in technology are committed, passionate, efficient.
Safety & quality are the key factors of UniSite group with good QHSE experience and ISO9001/BV certificate.
With professionalism, vitality, innovation, respect, team spirit, UniSite culture (corporate values, corporate philosophy and behavior shaping) is continuously developing, along with our company from its foundation.
UniSite group is able to offer our client best possible and most sustainable solutions to their requirement.
Photos of our Marine welded drag heads design
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