ED80/6 Ex Series Explosion-Protected Electro-Hydraulic Thruster

The ED80/6 Ex Series​ is a compact and robust explosion-protected (Ex) electro-hydraulic thruster​ designed for safe linear actuation in hazardous areas. It serves as the core actuator for spring-applied, fail-safe industrial brakes, where its primary function is to reliably release the brake upon command and allow it to engage automatically when power is removed-all within flammable or explosive atmospheres.

Core Design & Certification Philosophy

This series is the explosion-proof variant of the classic ED80/6 thruster. Its entire design, from the motor housing to the cable entry, is engineered to comply with stringent hazardous location standards. The "Ex" suffix explicitly denotes its certification for use in areas with explosive gases, vapors, or dusts.

Key Protection Standard:​ The thruster is typically certified to international explosion-protection standards, with common markings including:

ATEX:​ II 2G Ex d IIC T4 Gb / II 2D Ex tD A21 IP6X T135°C Db

IECEx:​ Ex d IIC T4 Gb / Ex tD A21 IP66 T135°C Db

This signifies a flameproof enclosure ('d')​ for gas atmospheres and dust ignition protection ('tD'), with a maximum surface temperature of 135°C (Temperature Class T4).

Operating Principle

The working principle remains the proven, reliable electro-hydraulic method, executed within a safe enclosure:

Release:​ When energized, the explosion-proof motor​ drives an integrated hydraulic pump. The pump pressurizes the oil inside the sealed chamber, forcing the piston rod to extend. This linear motion, typically transmitted via a lever, compresses the brake's powerful spring, releasing the brake.

Fail-Safe Application:​ Upon power loss or shutdown, the motor stops. Hydraulic pressure drops, and the force of the brake's return spring pushes the piston back to its retracted position. This action automatically and positively applies the brake, a critical safety function in hazardous zones.

Key Features & Specifications

Certified Explosion-Proof Construction:​ The motor and terminal compartment are housed in a rugged, flameproof enclosure with precisely machined flanges that cool any internal explosion gases, preventing external ignition. The main body provides dust ignition protection.

Balanced Thrust & Stroke:​ The designation "80/6" indicates a nominal thrust of approximately 800 Newtons (N)​ (≈80 kgf) and a standard stroke of 60mm. This offers a balanced combination of force and travel for a wide range of medium-duty industrial drum or disc brakes.

Oil-Immersed Reliability:​ The operating mechanism (motor rotor, pump) is bathed in hydraulic oil. This ensures:

Automatic lubrication and cooling.

Long service life and reduced maintenance.

Quieter operation and vibration damping.

Effective heat dissipation, aiding compliance with the T4 temperature class.

Compact and Integrated Design:​ It is a self-contained unit, requiring only an electrical connection and mechanical linkage. This simplifies installation in space-constrained and complex hazardous area layouts.

Robust Build:​ The housing is typically made of high-grade cast iron or aluminum alloy, offering excellent corrosion resistance and mechanical strength for harsh industrial environments.

Typical Technical Data

Rated Thrust:​ ~800 N (at specified operating pressure)

Stroke:​ 60 mm

Motor:​ Ex d IIC T4 rated, typically 3-phase, 0.25 kW - 0.37 kW, for common voltages (e.g., 380V, 415V, 50Hz).

Duty Cycle:​ Suitable for frequent operation, often rated for 60% or higher duty cycle.

Ingress Protection:​ Minimum IP66 (dust-tight and protected against strong water jets).

Ambient Temperature Range:​ Standard industrial range, e.g., -20°C to +40°C.

Primary Applications

It is exclusively​ used to actuate spring-applied brakes in hazardous areas (ATEX Zones 1 & 2 for gas, Zones 21 & 22 for dust), including:

Overhead Cranes & Hoists​ in chemical plants, paint shops, and fuel storage facilities.

Conveyor Drives​ in grain elevators, flour mills, and plastic processing plants (combustible dust).

Mining Equipment​ (where methane or coal dust is present).

Process Machinery​ in pharmaceutical, petrochemical, and offshore installations.

Advantages

Intrinsic Safety Compliance:​ Enables the use of efficient electro-hydraulic power in explosive atmospheres.

Proven Simplicity & Durability:​ Based on a simple, field-proven thruster design with minimal wearing parts.

Critical Fail-Safe Operation:​ Automatic spring-return braking is a fundamental safety feature.

Low Maintenance:​ The sealed, oil-immersed system requires only infrequent oil level checks under normal conditions.

Summary

The ED80/6 Ex Series Explosion-Protected Electro-Hydraulic Thruster​ is a specialized safety component that delivers reliable 800N of linear thrust with a 60mm stroke in the most demanding environments. By integrating a certified flameproof and dust-ignition-proof enclosure around a reliable oil-immersed thruster core, it provides a trusted solution for fail-safe braking on material handling and processing equipment operating in classified hazardous locations.

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