Beware of Dust Explosions! Navector Explosion-Proof Screening Machines Build a Dual Defense for Efficiency and Safety

In modern industrial production processes, powder screening is a fundamental operation widely used across various industries. However, in screening environments involving combustible dust or flammable gases, traditional screening equipment is highly prone to generating static electricity through friction or sparks from electrical components, which can trigger serious safety incidents such as fires and explosions.

Navector (Shanghai) Screening Technology Co., Ltd. has always regarded safety as the core direction of its technological innovation. In response to increasingly stringent global safety regulations and the upgrading and transformation needs of industrial sectors, the company relies on its core technologies to develop a series of forward-looking explosion-proof screening solutions. These solutions not only effectively ensure the continuous and stable operation of production lines but also build an active prevention and intelligent early-warning safety barrier for high-risk industries such as chemicals, new energy, and pharmaceuticals.

I. Analysis of a Dust Explosion Case

At 13:00 on February 15, 2025, a dust explosion accident occurred at a food ingredient company in Jimo District, Qingdao City, Shandong Province, resulting in a total of five fatalities.

Direct cause of the accident:
During equipment installation and commissioning, metal foreign objects that fell into the raw material silo or mixer generated mechanical sparks through friction and impact. This ignited an initial explosion of dust such as starch inside the equipment. The shock wave then raised starch and other raw materials stored in the workshop, triggering a secondary explosion.

Lessons learned:
Industrial and trade enterprises with combustible dust explosion hazards should strictly implement the requirements of the Safety Regulations for Dust Explosion Prevention in Industrial and Trade Enterprises (Emergency Management Department Order No. 6) and other relevant regulations.

• Strict design of dust explosion prevention safety facilities.

The design and construction of safety facilities for new, renovated, or expanded projects involving dust explosion hazards should comply with national and industry standards such as the Dust Explosion Safety Regulations.

• Effectively prevent dust ignition sources.

For dust collection systems handling combustible dust generated from metals or metal alloys such as aluminum, magnesium, zinc, and titanium, fan blades should be made of conductive materials that do not generate sparks during operation.

• Strict daily inspection and maintenance of equipment.

Fans and blades in dust collection systems should be firmly installed, operate normally, and produce no collisions, friction, or abnormal noise. Tools that may generate impact sparks must not be used during inspection and maintenance.

• Timely dust cleaning.

Dust in dust collection pipelines should be cleaned regularly. For dust collectors used in polishing and grinding systems of aluminum and magnesium products, the dust accumulation on the inner walls of air ducts should not exceed 1 mm. In workplaces, equipment, and facilities, dust layers thicker than 0.8 mm must not be present.

II. Advantages of Navector Screening Machines in Explosion-Proof Design

Navector screening equipment has established a multi-level comprehensive protection system in explosion-proof safety design, comprehensively enhancing the safety and reliability of the screening process:

• Elimination at the source: Selected materials and explosion-proof motor configuration

The machine body and key components are mostly made of anti-static and high-strength materials, with optional explosion-proof motors and spark-proof electrical components that meet strict explosion-proof rating standards.

• Environmental isolation: Fully enclosed and inerting protection systems

Navector equipment supports fully enclosed structural designs and can be combined with protective measures such as inert gas circulation, fundamentally isolating oxygen from combustible dust.

• Intelligent sensing: Real-time monitoring and early-warning systems

Key operating parameters such as vibration status and screen surface load can be monitored in real time, with warnings and adjustments implemented through the control system.

• Process optimization: Ultrasonic systems eliminate static electricity hazards

Navector’s ultrasonic mesh-cleaning system directly applies high-frequency vibration energy to the screen surface, effectively eliminating electrostatic attraction and agglomeration between powder particles.

• Flexible customization and global service support

Navector possesses strong customized design capabilities and a global technical service network, enabling the provision of dedicated explosion-proof screening solutions.

III. Certificate Display

Navector screening machines are widely used in industries such as food, pharmaceuticals, chemicals, metal powders, battery materials, rubber, and plastics, and are suitable for screening operations involving flammable and explosive materials.