Stp Bar Screen

The STP bar screen mainly consists of the following components: the drive device, frame, traction chain, mesh plates with lifting steps, flushing system, and electronic control system. The drive motor is installed on the main shaft at the front of the frame. Driven by the transmission chain, the mesh plates on both sides lift and remove the dirt trapped along their length from bottom to top. When reaching the upper part, through the steering action of the sprocket and under the effect of the top flushing device, the dirt is automatically discharged. The sludge and wash water are collected in the trough between the mesh plates on both sides and then discharged from the machine by gravity.

The drive device of the STP bar screen is located at the top of the frame and consists of a shaft-mounted reducer. Screw-type adjustment devices are installed at the front and rear of the frame to adjust the tension of the transmission chain.

The frame of the internal inflow mesh screen dirt remover is an integral rectangular rigid structure, assembled and welded from stainless steel plates and steel sections. There is a water inlet hole at the lower end facing the water. Guide rails are provided on the front and rear wall panels of the frame.

An internal sludge-collecting tank is also provided at the top, extending outside the machine. The frame is installed at the center of the screen well. The gap between the sides of the frame and the screen well forms the channel for the filtered water to flow out. Diversion baffles are arranged at both sides of the water-facing end of the frame to prevent floating debris from passing through while guiding the flow. The traction sprocket and transmission guide devices are located at the upper and lower parts of both sides of the frame.

The stepped mesh plates are made of ss304. The mesh surface has regularly arranged small holes that allow water to pass while intercepting sewage. The steps intercept larger debris.

The internal inflow mesh screen dirt removal machine is equipped with a reliable mesh flushing system. The medium-pressure flushing system starts and stops simultaneously with the screen, effectively removing most of the debris intercepted by the mesh plates. The high-pressure flushing system removes more stubborn debris and ensures that the mesh holes remain unblocked.

It is mainly composed of the machine main frame, filter plates, internal sludge collection tank, drive device, protective cover, screen cover, screen sludge flushing device, medium/high-pressure flushing water pump, flushing device pipeline filter, pump-to-screen backwashing pipeline, connecting accessories and valves, pressure gauge, double-side guide plates, overload protection device, on-site control cabinet, and other components.

1) Frame and Transmission Device
The structural dimensions of the internal inlet perforated plate-type fine screen are designed to meet the specified civil structure installation requirements. The frame of the plate screen is an integral structure with sufficient strength to withstand the impact of water flow and is easy to lift and install in the concrete channel.

The sealing plates at the water inlet and outlet ends, as well as on both sides of the internal inlet perforated plate fine screen, extend below the top of the channel to ensure overall sealing of the screen and facilitate odor control.

The inner-flow perforated plate fine screen consists of filter plates continuously rotated by a motor and placed within a fixed frame. The driving sprocket is fixed on the drive shaft, which is powered by a motor through a shaft-mounted gearbox. Sewage enters the fine screen through the central opening and is filtered from the inside out through the filter plates on both sides. Solid debris cannot pass through the screen or overflow directly to the back of the unit.

As the filter plates rotate continuously, the solids deposited on the inner side are lifted by the steps on the filter plates to the screen residue discharge area. The solids are then washed into the sludge collection tank by the flushing water at the top of the screen and discharged by gravity.

This fine screen is a highly reliable, stable, and efficient mechanical device for pollution removal and filtration, widely used in municipal sewage treatment, water supply treatment, various industrial wastewater treatments, and other solid-liquid separation applications.

During operation, the equipment can continuously and automatically remove solid suspended matter from the filtered water. It can remove floating debris such as wood, branches, and plastic products, as well as suspended matter like hair, fibers, and flocculent soft solids. It is an ideal and efficient pretreatment device for water supply and drainage systems.

The fine screen has been widely applied in sewage treatment, recycled water treatment, industrial wastewater treatment, water intake at water supply plants, industrial water intake at power plants, and other fields.

It is suitable for use in various water inlets containing floating debris, such as rivers, channels, screen wells, rainwater pumping stations, sewage pumping stations, hydropower stations, water plants, sewage treatment plants, power plants, and steel plants. It effectively intercepts and removes solids, provides preliminary water purification, and ensures the normal operation of downstream treatment equipment.