For dust problems in ingredient systems—particularly in the friction materials, refractory materials, and chemical powder industries—the industry typically adopts a comprehensive, multi-pronged solution approach. These solutions cover five key dimensions: source control, process interception, equipment protection, cleaning and maintenance, and safety and explosion prevention.

The following is a summary of typical solutions to dust problems in ingredient systems:

1.  Source control: Fully enclosed and sealed design

This is the most basic and also the most effective method, aimed at preventing dust from escaping.

Closed Conveying System:

Tube-chain conveyor / Screw conveyor: Replaces the open belt; the material travels within a fully enclosed pipe.

Vacuum feeder: Uses negative pressure to draw material from the hopper into the weighing hopper, with no exposed parts throughout the entire process.

Soft Connection vs. Hard Sealing:

Telescopic chute: A retractable dust-proof chute (with an internal airflow balancing tube) is used between the hopper discharge port and the receiving hopper. The chute automatically rises and falls with the liquid level, thereby reducing dust generation caused by the drop.

Double-layer flap valve / Rotary valve: As an airlock device, it ensures continuous material discharge while simultaneously preventing the mixing of upper and lower airflows and stopping dust from escaping.

Interface sealing: When the mobile batching vehicle docks with the stationary hopper, use a silicone skirt, an inflatable sealing ring, or a magnetic sealing cover to ensure zero leakage at the interface.

2.  Process interception: Negative-pressure vacuuming and airflow balance

When positive pressure is generated during material flow, it must be drawn back through negative pressure.

Key point vacuuming:

Install dust collection hoods above the feed inlet, weighing hopper, and discharge outlet.

The vacuum airflow rate must be calculated carefully—ensuring that it can effectively remove dust without, at the same time, sucking up the material itself (a mesh screen should be installed or the air velocity adjusted accordingly).

Breathing valve and balance pipe:

During the discharging process, the air expelled from the container carries dust particles. By routing the discharged air back to the hopper or dust collector via a balance pipe, an internal circulation is established, thereby preventing direct emissions into the workshop.

Central dust collection system:

All pipelines from dust-generating points are routed to a central baghouse or cartridge dust collector for unified treatment, ensuring that the emissions meet the required standards before being discharged.

3.  Equipment Protection: The “Armor” of Core Components

Prevent fine dust from entering precision components and causing malfunctions.

Sensor protection:

Use IP67/IP68 Grade weighing sensor.

Install stainless steel dust covers, corrugated hoses, or bellows to protect the sensor’s stress points and cables.

The junction box is sealed with potting compound.

Motion mechanism sealing:

Install telescopic protective covers (bellows covers) or labyrinth seals on moving parts such as guide rails, lead screws, and bearings.

Adopts maintenance-free sealed bearings to prevent dust from entering the grease.

Electrical cabinet protection:

The electrical control cabinet has been reached. IP54/IP65 Protection rating.

In high-dust environments, install a positive-pressure ventilation system (blowing clean air into the enclosure to maintain a slight positive pressure) to prevent dust from entering.

4.  Cleaning and Maintenance: Dust-Resistant and Easy to Clean

Address the issue of dust accumulation left over after resolving “leakage, spillage, and dripping.”

Pneumatic auxiliary material cleaning:

Pneumatic vibrator / Vibration motor: Prevents sticky dust from adhering to the walls of hoppers or chutes.

Compressed air purging: Automatically cleans residual dust from pipelines and weighing hoppers during formula changes or machine shutdowns, preventing cross-contamination.

Zero-dead-angle design:

The inner surfaces of the equipment are polished, and rounded transitions are used at the corners. R Corner), avoiding dust accumulation at right angles.

Design quick-release components (such as pipelines connected by quick-opening clamp fittings and detachable weighing hoppers) to facilitate rapid manual cleaning.

Self-cleaning technology:

Some high-end systems are equipped with online cleaning. CIP ) Interface or automatic brushing device.