Overview
The rainwater back-raking bar screen is a critical mechanical filtration device in water treatment systems. Unlike traditional bar screens, it employs a unique back-raking mechanism to clear debris from the bars, reducing clogging risks. It is widely deployed in municipal sewage plants, industrial facilities, and stormwater drainage networks to protect pumps and downstream processes. Designed for harsh environments, these screens are typically constructed from stainless steel or coated carbon steel to resist corrosion. Automated models integrate sensors and PLC controls for minimal human intervention, making them ideal for large-scale operations.
Structure and Working Principle
The equipment consists of a series of parallel bars (or grids) spaced at a fixed gap, a rake system, a drive unit, and a debris conveyor. Water flows through the bars while solids are trapped on the upstream side. The back-raking mechanism moves the rake teeth downward against the flow direction, dislodging trapped debris efficiently. The collected waste is then lifted and discharged onto a conveyor or into a collection bin. This reverse motion minimizes re-entrainment of debris, a common issue in conventional screens.
Key Features
Corrosion resistance is a standout feature, with materials like SS316 recommended for saline or chemically aggressive environments. The design also prioritizes low maintenance, with self-lubricating chains and replaceable rake teeth. Automation options include level sensors to trigger operation during high flow and integration with SCADA systems. Some models offer variable gap adjustments (e.g., 10–50 mm) to accommodate different debris sizes without compromising flow capacity.
Application Areas
Primary applications include municipal wastewater treatment plants, where screens prevent blockages in grit chambers and clarifiers. Industrial sectors like food processing and paper manufacturing use them to remove coarse solids before biological treatment. In stormwater systems, these screens are installed at inlet points to capture urban debris (e.g., plastic waste, branches). They are also used in hydropower plants to protect turbines from floating objects during heavy rainfall.
Maintenance and Precautions
Routine inspections should focus on rake alignment, chain tension, and wear of mechanical components. Lubricate moving parts monthly, and replace worn teeth or pins promptly to avoid uneven loading. For winter operation, heaters or anti-freeze coatings may be necessary in cold climates to prevent ice buildup. Always isolate power before servicing, and follow lockout-tagout (LOTO) protocols for safety.
B2B Procurement Guide
When sourcing, specify flow rate (m³/h), channel dimensions, and debris type (e.g., fibrous, abrasive). Request certifications like ISO 9001 and case studies from similar projects. Lead times vary from 4–12 weeks; expedited production may cost 15–30% more. For OEMs, consider spare parts availability—common items like rake teeth and seals should be stocked locally to reduce downtime.
Related Manufacturers
- 主营：转鼓式精密过滤器、滗水器、加药装置、机械格栅、回转式格栅除污机、中心传动刮泥机、网板格栅、雨水格栅、转鼓格栅、带式压滤机、搅拌机、转碟曝气机、叠螺式污泥脱水机、纤维转盘过滤器
- 主营：[]
- 主营：刮泥机、吸泥机、中心传动刮泥机、周边传动刮泥机、行车式刮泥机、虹吸式刮泥机、桥式吸砂机、机械格栅、格栅除污机、格栅清污机、内进流网版格栅除污机、反捞式格栅除污机、钢丝绳格栅除污机、回转式格栅机、微滤机、循环式格栅机、桁架式刮泥机、链条式刮泥机、提耙式刮泥机、刮吸泥机、全桥式刮泥机、耙齿式格栅机、滤布滤池、纤维转盘过滤器、转鼓精密过滤器
- 主营：潜水推流器、污泥回流穿墙泵、旋转式滗水器、潜水搅拌机、双曲面搅拌机、桨式搅拌机、框式搅拌机、立式环流搅拌机、推流搅拌曝气机、回转式格栅除污机、回转耙式格栅除污机、中心传动刮泥机、中心传动浓缩机、周边传动刮泥机、无轴螺旋输送机、潜水搅拌机叶轮、潜水搅拌机导流罩、双曲面搅拌机叶轮、离心曝气机、螺旋压榨机、砂水分离器、旋流沉砂器、全自动加药装置、潜水推流器叶桨、安装系统
- 主营：砂水分离器、纤维转盘过滤器、旋流沉沙器、格栅机、刮泥机、细格栅型号、内进流网版格栅清污机、吸泥机、反冲洗微滤机、机械格栅、回转式格栅清污机、回转格栅机、周边传动刮泥机材质、行车式刮吸泥机、桥式吸砂机、虹吸式刮泥机、耙齿捞渣机、钢丝绳格栅除污机、反捞式格栅除污机、全桥式刮泥机、滚筒微滤机、内进流网版细格栅、桁车式刮泥机、转鼓精密过滤器、滤布滤池
- 主营：纤维转盘过滤器、滤布滤池、转鼓精密过滤器、刮泥机、中心传动刮吸泥机、周边传动刮泥机、虹吸式刮泥机、桥式吸砂机、行车式刮泥机、全桥式刮泥机、链条式刮泥机、机械格栅、格栅除污机、内进流网板式格栅机、钢丝绳格栅除污机、转鼓式格栅机、阶梯式格栅除污机、外进水微滤机、内进水微滤机、滚筒式微滤机、旋流沉沙器
- 主营：一体化污水处理设备、石英砂过滤器、重力阀过滤器、溶气气浮机、机械格栅、周边转动刮泥机、全自动加药装置
- 主营：[]
- 主营：潜水推流器、污泥回流泵、管道混合器、潜水搅拌机、双曲面搅拌机、桨式搅拌机、框式搅拌机、立轴水翼搅拌机、立式环流搅拌机、潜水离心曝气机、潜水射流曝气机、回转式格栅、回转耙式格栅、中心传动刮泥机、中心垂架吸泥机、周边传动刮泥机、周边传动桥式吸泥机、中心传动污泥浓缩机、单管刮吸泥机、虹吸式吸泥机、无轴螺旋输送机、旋转式滗水器、旋流沉砂器、砂水分离器、电动泥斗
- 主营：刮泥机、投加机、机械格栅除污机、污水处理设备、全自动加药设备
- 主营：升降坝、拍门阀、木质闸门、启闭机、细格栅、耙齿格栅、铸铁闸门、圆形拍门、河道水库、排水闸门、液压闸门、液压翻板、手摇卷扬、钢坝闸门、水流调节、液压升降、电动液控、钢制闸门、液压钢坝、闽宏水利、固定卷扬、平板闸门、材料塑料、旋转钢坝、防止水流
- 主营：电动阀、钢制拍门、铸铁闸门、启闭机、排污机、清污机、污水管道、自动闸门、液压钢坝、玻璃钢闸门、单向止水闸、复合材料拍门、一体钢制闸门、暗杆式钢制闸门、耐腐蚀钢制闸门、水利工程景观坝
- 主营：拦水坝、液压钢坝、液压合页坝、格栅清污机、抓斗清污机、回转式清污机、液压翻板闸门
- 主营：螺杆启闭机、铸铁闸门
- 主营：潜水推流器、污泥回流穿墙泵、管道混合器、潜水搅拌机、双曲面搅拌机、桨式搅拌机、框式搅拌机、回转式格栅除污机、回转耙式格栅除污机、钢丝绳牵引式格栅除污机、刮吸泥机、离心曝气机、射流曝气机、无轴螺旋输送机、沉砂池吸砂机、旋转式滗水器、砂水分离器、旋流沉砂器
- 主营：潜水推流器、污泥回流泵、旋转式滗水器、潜水搅拌机、双曲面搅拌机、桨式搅拌机、框式搅拌机、立式环流搅拌机、回转式格栅、回转耙式格栅、中心传动刮泥机、中心传动浓缩机、周边传动刮泥机、无轴螺旋输送机、潜水搅拌机叶轮、潜水搅拌机导流罩、双曲面搅拌机叶轮、砂水分离器、旋流沉砂器、全自动加药装置、潜水推流器叶桨、玻璃钢浮筒、安装系统
- 主营：污水处理设备、污泥脱水、脱水设备、带式压滤机、真空过滤机、污泥脱水机、过滤机、脱水机、脱水一体机、浅层气浮机、压滤机、压滤设备、废水处理装置
- 主营：叠螺机、叠螺污水脱泥机、叠螺式污泥脱水机、干湿分离机、固液分离机、斜筛式固液分离机、耙齿格栅、耙齿格栅除污机、pam加药机、螺旋输送压榨机
- 主营：焚烧炉、真空带、隔油池、加药机、气浮机、过滤机、刮泥机、压滤机、定制雨水、过滤器、实验室、泥浆脱水、洗沙泥浆、污泥叠螺、滤布滤池、捞取设备、泥浆压干、溶气气浮、污泥脱水、加药装置、焚烧设备、厨房污水、压干设备、洗沙污泥、自动隔油
- 主营：水库铸铁闸门、铸铁镶铜闸门、钢坝、格栅除污机、启闭机、机械格栅、液压坝、门式冲洗系统、堰门、智能一体化闸门、拍门、平板滤网、钢制闸门、限流闸门
- 主营：潜水搅拌机、太阳能曝气机、双曲面搅拌机、框式搅拌机、机械格栅、无轴螺旋输送机、刮泥机、低速推流器、污泥回流泵
- 主营：闸门、门式冲洗系统、堰门、启闭机、平板格栅、格栅除污机、限流闸门、拍门、钢坝
- 主营：转鼓式精密过滤器、纤维转盘过滤器、一体化加药装置、格栅除污机、螺旋输送机、压滤机、除污机、微滤机、输送机、浓缩机、耙齿格栅、阶梯格栅、污机格栅、网板格栅、机械格栅、污泥脱水机、过滤器、储料仓、沉淀池、石灰料仓、加药装置、投加装置、装卸设备、溶气气浮、不锈钢闸门