Vertical Bar Screens

Mojan Vertical Mechanical Bar Screens are designed for the continuous removal of coarse solids from wastewater streams. The equipment consists of a fixed vertical frame, mechanical cleaning rake, rake cleaner, screening grid, and a hydraulic drive system equipped with a double-acting cylinder.

The main structural components can be manufactured from structural steel or stainless steel, depending on the project requirements and operating conditions. The screening grid consists of parallel flat bars or round bars designed to retain coarse solids from the wastewater flow.

Vertical mechanical screens can be installed in open channels as a preliminary treatment unit in municipal and industrial wastewater treatment plants. Their main application is in locations where the collected screenings need to be discharged at a significant elevation above the channel or ground level.

Main Components

The main components of Mojan Vertical Mechanical Bar Screens include:

• Fixed vertical main frame
• Screening grid
• Mechanical cleaning rake
• Rake cleaning mechanism
• Hydraulic drive system
• Double-acting hydraulic cylinder
• Moving carriage
• Guide system
• Hinged rake cleaner
• Screenings discharge chute

The frame and structural components can be manufactured from structural steel or stainless steel according to the required corrosion resistance and project conditions.

Operating Mechanism

Mojan Vertical Mechanical Bar Screens operate automatically based on the upstream water level.

When screenings accumulate on the screening grid and cause the upstream water level to rise above the preset level, the Level Switch activates the cleaning cycle.

The cleaning rake is mounted on a moving carriage. Once the hydraulic system is activated, the rake moves downward toward the bottom of the channel. Under its own weight, the rake engages firmly with the screening grid.

The hydraulic cylinder then drives the rake upward along the screen. The rake moves within a dedicated guide system, ensuring continuous contact with the screening grid throughout its travel and effectively collecting the accumulated screenings retained between the bars.

When the rake reaches the upper section of the screen, a hinged rake cleaner positioned at the top of the main frame removes the collected screenings from the rake.

The screenings are then transferred onto an inclined discharge chute, allowing them to be conveyed outside the screening channel for collection and disposal.

Key Features

• Fully integrated and prefabricated construction
• Compact design with minimal floor space requirements
• Easy installation in open channels
• Suitable for high-elevation screenings discharge
• No significant limitation on discharge height
• Economical operation
• Simple and reliable operation
• Hydraulic cleaning mechanism
• Automatic operation based on upstream water level
• Low maintenance requirements
• Structural steel or stainless steel construction options

Applications

Mojan Vertical Mechanical Bar Screens can be installed in open channels as a preliminary wastewater treatment unit and are suitable for:

• Municipal wastewater treatment plants
• Industrial wastewater treatment plants
• Wastewater pumping stations
• Preliminary wastewater treatment
• Coarse solids removal
• Open-channel screening systems
• Installations requiring high-elevation screenings discharge

The vertical configuration is particularly advantageous where the collected screenings need to be lifted and discharged at a considerable height, providing an efficient solution while minimizing the required installation footprint.

Customized Design by Mojan

Mojan designs and manufactures Vertical Mechanical Bar Screens according to the specific hydraulic, structural, and operational requirements of each project.

The equipment can be customized based on:

• Design and peak wastewater flow
• Channel dimensions
• Required bar spacing
• Screen height
• Required screenings discharge elevation
• Type and quantity of screenings
• Material of construction
• Hydraulic system requirements
• Control and automation requirements
• Screenings collection and disposal method