Brackett Green has installed Bosker Trash Rakes at a wide variety of water intakes, where a key objective has been the provision of simple and effective coarse screening. Often acting as the very first screening stage, Trash Rakes offer a vital means of removing large volume,awkward debris such as driftwood and tree trunks from the water protecting critical power generation equipment or down stream pumps.

At very large plants,where debris is extremely heavy multiple bar screens are often employed each with its own individual raking head assigned to each screen.At slightly smaller plants, a traveling Trash Rake 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. Traveling Trash Rakes feature a monorail track,upon which the Rake travels at speeds of up to 20 meters per minute. Pre-programmed stops are arranged so the Trash Rake descends down the bar screen and into the water, where the Rake head’s tines open, grab, and then remove the captured debris.

Having filled the gripper with debris, the Trash Rake begins an upward ascent, and cleanly deposits the debris either directly at deck-level,or more commonly, with the advantage of eliminating the need for conveyors, into a strategically positioned skip or container. The Rake then continues its journey to its next preset mined stop, where the cycle is repeated.

All motors for the Bosker range of T ash Rakes are concealed and protected within the Rake's trolley assembly. A hoist motor, which lowers and lifts the Rake's gripper, drives through a gearbox to the main hoist shaft. Cable drums are fitted to this shaft, on which the main lift cables are wound. The 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. All control cabling is routed through the supporting framework. Hydraulic hose drums which contain the hoses to the grab's close and open rams,are driven by the main hoist motor and feature a spring tension system to ensure a constant and equal cable tension is always maintained. The trolley also contains the traveling motor and hydraulic power pack.

Depending upon the application, grippers can be produced in a variety of different materials. These vary from stainless steel,which with its non-corrosive properties is well suited to seawater and sewage, to hot-dipped galvanized steel for fresh waste environments. A non-spark, aluminum bronze design is a further alternative for sewage plants where non-sparking materials are mandatory. The table below provides a brief guide to gripper handling criteria.

The supporting framework for the Bosker T ash Rake is constructed from long lasting hot-dipped tubular galvanized steel sections. This structure is tailored to each, individual installation and is always designed to optimize available space, whilst also being aesthetically sympathetic when retrofitted to existing sites, and in order to reduce alterations to civil works the Trash Rake's framework is mounted to existing floors and walls.

Contact our sales team to discuss your requirements.