G4 Coarse Efficiency Winding Filtration Equipment

Widely used in Painting/Spraying Workshops: Serves as primary filtration for paint booths and curing ovens, protecting downstream high-efficiency filters from rapid clogging.Automobile Manufacturing, Machining: Filters dust from outdoor air in large factory central air conditioning systems, ensuring workshop cleanliness and product quality. Electronics, Semiconductor Plants: Acts as a pre-filter in clean room AHUs, extending the service life of medium and high-efficiency filters. Food, Pharmaceutical Factories.

Main Structural Components:

Filter Unit (Core Part):

Filter Media: Usually made of synthetic non-woven fabric, fiberglass, or activated carbon composite media, etc., formed into a roll. The media has uniform grid lines for strength support and sensing control.

Upper/Lower Roller Shafts: The roll of clean filter media is installed on the upper shaft. The used, dirty media is collected on the lower shaft.
Filter Section: The media is drawn from the upper shaft, passes vertically or horizontally through the equipment frame to form an effective filtering surface, and is then wound onto the lower shaft.

Drive and Control Unit:

Motor: Provides power to drive the rotation of the lower shaft, winding the media.

Control System: This is the "brain" of the unit, typically triggering media replacement based on one or more of the following signals:

Differential Pressure Control (Most Common): Pressure sensors are installed on both sides of the media (air inlet and outlet). When dust accumulation increases the resistance (differential pressure) to a preset value (e.g., 100-150 Pa), the control system automatically starts the motor to advance a new section of media.

Timer Control: The media is replaced periodically at fixed intervals (e.g., once a week) based on experience.

Manual Control: A manual button on the control panel forces media replacement.

Casing and Frame:

Made of metal (such as galvanized steel sheet, aluminum alloy) to support all internal components and provide interfaces for duct connections. Requires sturdy structure and good sealing.

Other Accessories:

Inspection Window: Allows visual inspection of the media's dirt level and remaining quantity.

Alarm Device: Emits audible and visual alarms when the media is nearly exhausted or the equipment malfunctions.

Initial State: New, clean filter media is drawn from the upper shaft, covering the entire filter face, with its end fixed to the lower shaft.

Normal Filtration: Dust-laden air passes through the media; dust is captured on the media surface, and clean air enters downstream equipment or the space. As filtration proceeds, dust accumulates on the media surface, gradually increasing airflow resistance and causing the pressure differential across the media to rise.

Automatic Start: When the differential pressure reaches the preset "start value," the pressure sensor sends a signal to the controller.

Rolling Update: The controller starts the motor, driving the lower shaft to rotate. This winds up the dirty media while simultaneously pulling a corresponding length of clean media from the upper shaft. This process typically lasts from a few seconds to several tens of seconds.

Automatic Stop: After the media is updated, the controller stops the motor either when the differential pressure drops to the "initial value" or after the motor has run for a preset fixed duration.

Cycle and Alarm: This process repeats cyclically until the media on the upper shaft is fully used up. At this point, the control system triggers a "media exhausted" alarm, prompting maintenance personnel to replace the media roll.

Remarks: (1) Initial resistance tolerance of± 10% (2) Support customer size