Brackett Bosker automatic raking machines are fully customizable and automated systems that combine debris cleaning and conveying systems while offering a range of benefits.

Brackett Bosker automatic trash rakes have been installed at a wide variety of water intakes where a key objective has been the provision of simple and effective coarse screening. Brackett Bosker automatic trash rakes often act as the very first screening stage. They are a vital means of removing a large volume of awkward debris (such as driftwood and tree trunks) from the water and protecting critical power-generation equipment or downstream pumps.

For normal applications at slightly smaller plants, a traveling Brackett Bosker automatic trash rakes and trolley assembly can service a multiple screen installation. With either design, the overhead positioning of the rake’s trolley creates the advantage of a clean and entirely accessible screen deck.

Protected machinery

Motors for Brackett Bosker automatic raking screens are concealed and protected within the trolley assembly. A hoist motor (which lowers and lifts the rake’s gripper) drives through a gearbox to the main hoist shaft. The main lift cables are wound on cable drums fitted to the shaft. The Brackett Bosker automatic trash rake’s power pack is a self-contained unit where core components such as the motor, pump, solenoid valve, filters and pressure relief valve can all be easily accessed for maintenance. The control cabling is routed through the supporting framework. Hydraulic drums — which contain the hoses to the grab’s close and open rams — are driven by the main hoist motor with a spring tension system to ensure a constant and equal tension is always maintained. The trolley also contains the traveling motor and hydraulic pack. Drives are protected within the track assembly.

The Brackett Bosker smart design makes operation trouble-free. If for example, the gripper is unable to submerge due to a large buoyant object, it will close and cease to descend, preventing possible cable entanglement. By locating the hoses behind the hoist cables, the chance of damage by floating debris is reduced. Mounting the hydraulic cylinders directly on the gripper minimizes the number of submersible moving parts. No moving parts are permanently submerged.

How it works

The Brackett Bosker automatic trash rake traverses on a monorail track over the screen and dump areas. Travel speeds are between 10-20 meters per minute. At installations where there is a long track length and a heavy debris loading, a dual travel speed of 30-60 meters per minute would be specified to reduce the overall cleaning cycle time. At the start signal, the Brackett Bosker automatic raking screen travels to the designated screen area and stops over its first pickup point. Next, the gripper descends to the bottom of the screen, collecting debris in its jaws. Cylinders close the gripper, and the hoist elevates the gripper and debris to the trolley. Then the trolley and gripper return to the dump area where the gripper opens, releasing debris into the hopper, trailer or other dumpsite. The Brackett Bosker automatic trash rake then moves back to the second pickup point at the screen, continuing the cycle until the selected screen area is clean.

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