Step screen

The filtrating high resistance step screen, completely automatic and with mechanic self cleaning, is adequate for its set up and operation in a screening channel, width and deepness according to the attached drawings.

A maximum of m3 of waste water should pass through the step screen at a speed of m/seg, accordingly to the technical description.

The step screen should filter all materials and reduce to a minimum the charge loss that passes through it. The step screen should eliminate all the material with a diameter of more than 80 mm. The step screen displays a clean filtrating surface for the incoming flow.

Besides the wastes of small dimensions, the rest of the material, of size up to 80 mm, is automatically transported by the step screen to be deposited in the waste concentrator (supplied by separately).

The step screen is cleaned automatically by mechanical means. It also has a brush to eliminate the material deposited in a surface, obtaining a correct cleaning of the filtrating elements (B.O.P.I. U9701678 O patented system). Its operation is through a combination of toothed wheel of powering/discharge that powers the whole and eliminates the material, filtering the step screen.

The toothed wheel segments penetrate in the screen openings from the interior and push the wastes outside the elements. A scraping plate set up in the back part of the unit scrapes the particles and other adherent material as they accumulate through the screen openings. The unit uses flows of water to increase the efficacy of the cleaning. The step screen is clog proof and does not have jagged mechanisms.

The step screen does not require fixing elements in the lateral walls or in the bottom part of the channel. It can incline or be extracted from the coronation of the wall for its inspection or maintenance without emptying the water to the channel.

The step screen’s powering unit is performed by means of a hollow axis driver that will form a compact and hermetic unit.

The case is built in grey welding, the gears are manufactured in high resistance casehardened and tempered steel. The clients of the gears are rectified.
The electric engine is according to the standing standards and regulations as DIN-40050-VDE.0171.

The wiring ESTATOR VDM-0530, isolation F class, IP-55 protection and optionally, IP-68 three- phase alternating current 220/380-50 Hz.

Optionally, the equipment can be powered by means of an oleo hydraulic group.