DLS Conveyor Belt Tunnel Metal Detectors

The DLS Series Metal Detector from Weifang Hengji Electromagnetic Machinery Co., Ltd. is a high-precision detection equipment specifically designed for bulk material conveyor systems. This advanced conveyor belt metal detector utilizes cutting-edge digital signal processing technology to accurately identify various metal impurities including iron, steel, copper, and aluminum within transported materials.

The system outputs alarm signals or interlocking control signals to effectively protect downstream crushers and grinders from damage caused by metallic foreign objects. This tunnel metal detector is widely used in mining, power generation, building materials, metallurgy, and chemical industries, serving as an essential safety solution for modern production lines.

Its robust design and intelligent features make this conveyor belt metal detector a reliable choice for enhancing operational safety and efficiency across various industrial applications.

High Sensitivity Detection
This conveyor belt metal detector utilizes multi-frequency digital signal processing to detect metal objects as small as Φ20mm iron balls or Φ25mm non-ferrous metals, with adjustable sensitivity levels for precise operation.

Strong Anti-Interference Capability
Equipped with automatic material compensation, the tunnel metal detector effectively suppresses “material effect” caused by minerals and coal, significantly reducing false alarms in bulk material handling.

Intelligent Recognition
Featuring a built-in microprocessor, this conveyor belt metal detector distinguishes between magnetic and non-magnetic metals while automatically adjusting detection parameters based on material characteristics.

Stability and Reliability
With IP54 protection rating and operational range from -20°C to 50°C, this tunnel metal detector includes self-diagnostic functions for reliable performance and proactive maintenance.

Multiple Output Options
The system provides relay contacts (NO/NC), 4-20mA analog signals, and RS485 communication interfaces for flexible integration with various industrial control systems.

Easy Installation
The conveyor belt metal detector features a tunnel-style design that requires no cutting of the conveyor belt, supporting both horizontal and vertical mounting configurations.

The DLS conveyor belt metal detector operates on electromagnetic induction principles, consisting of two main components: a sensor and a controller. The sensor generates a high-frequency electromagnetic field that detects metallic objects passing through the detection zone.

When metal objects pass through this tunnel metal detector, they cause disturbances that alter the induced signals. The controller amplifies, filters, and digitally processes these signals using specialized algorithms to distinguish metal signatures from material noise, ensuring accurate detection.

Upon metal detection, the conveyor belt metal detector activates audible/visual alarms and outputs control signals to stop the conveyor or divert material. Utilizing phase discrimination technology, this tunnel metal detector can identify different metal types—ferrous metals cause phase lag while non-ferrous metals produce phase lead, enabling precise metal classification.

Mining Industry
This tunnel metal detector is ideal for conveyor lines in iron and copper ore processing, preventing metal debris from damaging crushers. The conveyor belt metal detector also serves in coal handling systems to remove hazardous metals including detonators and tools.

Power Generation
Deployed in coal-fired power plants for protecting coal mills and crushers on fuel conveyor belts. The tunnel metal detector is equally suitable for biomass power plants in fuel pre-processing systems, ensuring equipment protection.

Building Materials
Used in cement production lines for detecting metal contaminants in limestone and clinker conveyors. This conveyor belt metal detector also applies to aggregate and sand production lines for effective impurity detection and removal.

Metallurgy and Chemical Industries
Essential for raw material pre-processing in steel plants, the tunnel metal detector ensures material purity. It also serves chemical industries for inspecting plastic pellets and fertilizers, maintaining production quality standards.

Other Applications
The conveyor belt metal detector supports metal recovery in waste treatment plants and ensures metal-free processing in food and grain handling operations, providing versatile detection solutions across various industries.

Technical Support
We offer on-site installation guidance and commissioning services. Free operator training is provided, covering equipment principles, daily maintenance, and troubleshooting.

Customized Solutions
Detection parameters can be optimized based on material properties including size, moisture, and conductivity. Customized versions are available, such as explosion-proof, high-temperature resistant, or extra-wide belt models.

System Integration
The detector can be integrated with magnetic separators, belt scales, and other equipment for centralized control. Communication interface development services for DCS/PLC systems are also provided.

After-Sales Service
All units come with an 18-month warranty and lifelong maintenance support. We offer a 48-hour emergency response and supply quick-replacement services for spare parts.

The DLS Series Metal Detector is recognized for its high reliability, intelligent operation, and flexible configuration, making it the preferred choice across industries for metal detection applications. Optimal performance requires careful selection based on material properties, conveyor specifications, and process requirements.