Traditional trash rakes can require complex civil works and large amounts of space for operating, as well as having only limited abilities to remove oversized, awkward debris such as tree trunks, tires, weeds, etc. Conventional rakes also have difficulty in removing fibrous material that becomes entwined in the screening bars. These rakes either ride over debris or push debris deeper into the bar screen, compounding the effects of headloss and excessive velocities through the bar screen. Additionally, after a traditional trash rake has removed the debris, a second debris handling system is required as conventional rakes have difficulty in raking multiple bar screens. This adds to the increase in costs, complexity, and maintenance.
The raking screen is a trash rake cubed, adding value by doing the work of three conventional machines - a trash rake, conveyor and debris loading system. The need for multiple rakes, conveyor belts or manual handling of debris gets diminished which substantially reduces the costs. Debris is loaded directly into a dump skip or trailer which eliminates the need for additional handling. Open, overhead construction means that the screen deck is uncluttered. If required, our engineers can include bends in the overhead monorail, allowing access to multiple screens or remote dump sites. The operation is fast, simple and completely automatic which provides 24-hour coverage in case of night-time screen blockages.
The trash rake traverses on a monorail track over the screen and dumps areas. The travel speed is between 10-12m/min. At installations in which there are a long track length and a heavy debris loading, a dual travel speed of 30-60m/min would be specified to reduce the overall cleaning cycle time. At the start signal, the raking screen travels to the designated screen area and stops over its first pickup point. Then 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. The trolley and gripper return to the dump area where the gripper opens, releasing debris into the hopper, trailer or another dumpsite. After that the trash rake moves back to the second pickup point at the screen, continuing the cycle until the selected screen area is clean.Features -