Drag Heads
VOSTA LMG offers 2 different types of drag heads, Universal Type and Actice Drag heads.
Universal Drag Heads
VOSTA LMG’s 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.
Active Drag Heads
VOSTA LMG’s 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 an integrated part of the drag head.
Various control systems are available from VOSTA LMG, 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.
