Automatic travelling grab screens
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Replacing numbers of rotary bar screens by a special design of gripper unit at multi water channels in river water pumping stations. Grand Prize for the excellent patent Korea 2022. Widen gripper and AI running according to the differences of water levels.
One gripper system has applied 8 waster channels, W5.2 00 X H 11m each. The system is consisted of traveling & traversing unit, a gripper unit, supporting columns, moving cables, main screens, belt conveyor. Grab Screen system runs at 3 modes such as Automatic sequency per each water channel, Automaitic run for differential water levels, and Manual run by operator. Traveling & Traversing speed, gripper down and lift up speed, gripper closing and opening time is adjustable by pre-set of programming of control panel.
DWA fabricates and supply Automatic Travelled Grab Screens to grip, lift up, and discharge trash on belt conveyor or hopper by a claw unit in front of river water pumping stations. One claw unit runs 2 to 10 water channels according to the differential water levels or programmed logic automatically. The equipment is so effective way to reduce equipment investment with much energy saving. In case of installation of automatic rotary screen in each water channel, more numbers of rotary screens are required, however, one grab (claw) system runs on all channels bring the effect don’t require more equipment in all water channels. Rotary screen has the limited capacity to lift up trash in the river water and can not lift up large volume of trash due to limited rake dimensions, however, in case of Automatic travelled grab screen, heavy and large sized trash can be lift up and discharge to belt conveyor or hoppers easily. According to design consideration, no require to install belt conveyors to move trashed to hoppers because the grab screen discharge trash to hopper directly. Whole system is protected by Korea Patent Office through Patent Registration by DWA in 2020. Has awarded the Grand Prix for Excellent Patent Korea 2022 by Korea Institute of Patent Information Korea Times. Has the reference in Thailand. There are more demands in power plants using seawater as cooling water.
Claw unit is made of stainless steel 304 or 316 according to condition of river water. Width of claw unit is variable fit to width of water channel. 4 sets of wheels are equipped on back side of claw unit. Travelling and Traversing unit has driving & lifting motors, wire drum, limit switches, and other necessary electronic parts. The positions for claw unit’s downing and upping are adjustable by set of program in control panel and the adjustment of limit switches equipped. Ultrasonic water level transmitters are installed in front or rear side of grab screen system and transmit signal to main control panel to allow claw unit runs per differential water or trash levels automatically. In case of automatic sequency, the claw unit moves each water channel in sequency. In case of emergency in water channel or system, or maintenance for system, operator can run the equipment in manual mode. Overloads in lifting capacity or others, alarm producing and the equipment stop run automatically.
5,200mm width of Claw unit is made of stainless steel 304. Claw unit to grip, open, lift up, and discharge trash on hopper or belt conveyor. Picture for Going down of claw unit to river water in-coming pumping station. Another picture for MOP of for grab screens equipped inverters, PLCs, and other electronic parts. Indicator for ultrasonic water level transmitters.
