The Mechanical Coarse Multi Rake Bar Screen is a heavy-duty, chain-driven mechanical screening system designed for robust pre-treatment of wastewater by capturing and removing large, coarse, and fibrous solids from influent streams. It is widely used in municipal sewage treatment plants, industrial effluent treatment units, stormwater drains, raw water intake structures, and pumping station headworks.
| Process Step | Description |
|---|---|
| Influent Entry | Wastewater enters the channel and flows toward the fixed bar rack for preliminary screening. |
| Solid Retention | Solids larger than the pre-selected bar spacing are retained on the screen surface, preventing downstream passage. |
| Rake Engagement | Multiple rakes mounted on heavy-duty chains engage the bars and lift the accumulated debris. |
| Debris Conveying & Discharge | Rakes transport the collected solids upward to the discharge point, where a scraper or conveyor removes them into a bin or conveyor system. |
| Continuous Cleaning | After discharge, the rakes return downward automatically, ensuring continuous and uninterrupted cleaning without manual intervention. |
| Parameter | Range / Option |
|---|---|
| Screen Type | Multi-rake, chain-driven |
| Installation Angle | Vertical or inclined (customizable) |
| Bar Spacing | Typically 6 mm to 70 mm (or per design) |
| Channel Width | 500 mm – 4000 mm (or custom) |
| Material of Construction | SS304 / SS316 (or higher grades) |
| Drive System | Electric motor + gearbox with torque limiter |
| Control | PLC / Automatic with manual override |
| Discharge Options | Chute / Conveyor / Skip |
| Key Highlights | Description |
|---|---|
| Efficient coarse screening | Designed to intercept large and medium solids such as plastics, rags, leaves, and fibrous materials before wastewater enters downstream treatment stages. |
| Chain-driven rake mechanism | Multiple chain-mounted rakes provide continuous cleaning of screen bars, minimizing manual intervention and preventing clogging. |
| High throughput & low head loss | Optimized bar spacing and rake geometry allow high flow rates with minimal hydraulic resistance, maintaining overall plant efficiency. |
| Durable construction | Manufactured using corrosion-resistant stainless steel such as SS304 / SS316 for long-term service in harsh wastewater environments. |
| Customizable & flexible design | Bar spacing, channel width, inclination angle, and material options can be tailored to suit specific plant requirements and site constraints. |
| Automatic & low-maintenance operation | PLC or timer-based control enables fully automated operation, reducing manpower requirements and minimizing downtime. |
