ED30/5Ex ED Series Explosion-Protected Electro-Hydraulic THRUSTER

 

 

1. Core Parameters

Parameter Category	Specific Values
Product Model	ED30/5Ex
Product Type	Explosion-protected electro-hydraulic thruster (spring reset, normally closed)
Nominal Thrust	300 N
Rated Stroke	50 mm
Explosion-Proof Rating	Ex d IIC T4 Gb (gas zone); Ex tD A21 IP65 T135°C (dust zone)
Rated Voltage	380V three-phase AC (optional 220V AC)
Rated Power	180 W
Rated Current	0.43 A
Working Pressure	8–12 MPa
Extension Time	≤0.38 seconds
Retraction Time	≤0.35 seconds
Operating Frequency	≤1500 cycles per hour
Protection Class	IP65
Operating Temperature Range	-10°C to 60°C
Equipment Weight	≈28 kg
Compliance Standards	GB 3836.2-2010, GB/T 18839-2019, IEC 60079

2. Working Principle

The ED30/5Ex adopts the core logic of "explosion-protected electric-hydraulic drive for extension + spring reset for retraction," with explosion-proof design integrated into all electrical and structural components. The working process is divided into three key stages:

2.1 Thrust Output (Power-On Stage)

When connected to the rated explosion-proof power supply, the built-in Ex d IIC T4 explosion-proof asynchronous motor starts, driving the integrated low-noise gear pump to rotate at high speed.

The gear pump draws ISO VG46 anti-wear hydraulic oil from the sealed explosion-proof oil tank (capacity: 8 L) through a 10 μm precision suction filter, pressurizing it to 8–12 MPa.

High-pressure oil is delivered to the single-acting hydraulic cylinder, pushing the piston and chrome-plated alloy steel push rod to extend linearly. Within a 50 mm stroke, it stably outputs 300 N nominal thrust, transmitting force to matched explosion-proof mechanisms (e.g., brake linkages, clamping devices) to complete release or activation actions.

2.2 Reset (Power-Off Stage)

When the power is cut off or the control signal terminates, the explosion-proof motor stops, and the hydraulic pump ceases pressure supply. The built-in pressure relief valve (max pressure ≤15 MPa) opens, allowing hydraulic oil to flow back to the tank.

The high-tension 60Si2MnA alloy steel return spring rebounds, pulling the piston and push rod back to the initial position. Thrust is fully released, enabling the matched mechanism (e.g., brake) to reset under its own spring force, achieving emergency braking or locking.

2.3 Safety & Explosion-Proof Guarantees

Flameproof Structure: The motor and electrical junction box adopt flameproof enclosures with minimal explosion gaps (≤0.2 mm), preventing internal sparks from igniting external flammable gases or dust. Explosion-proof cable glands seal all wire entries to block gas/dust intrusion.

Overload & Overheat Protection: The motor is equipped with F-class insulation and a thermal protector, automatically cutting off power when the temperature exceeds 155°C to avoid burnout. The relief valve prevents hydraulic system overpressure, protecting the cylinder and seals.

Anti-Leakage & Dustproof: The cylinder uses FKM high-pressure explosion-proof seals (pressure resistance ≥20 MPa) to eliminate oil leakage; the entire unit meets IP65 protection, resisting dust and water splashes in harsh hazardous environments.

Status Feedback: Optional explosion-proof position sensors (Ex ia IIC T4) output "extended" and "retracted" signals, enabling interlock control with the host equipment to avoid misoperation.

3. Key Features

Dual-Zone Explosion-Proof Adaptability: Complies with both gas and dust explosion-proof standards, suitable for Zone 1/2 (flammable gases like methane, propane) and Zone 21/22 (combustible dust like coal dust, grain dust) hazardous areas.

Compact & Integrated Design: All components (explosion-proof motor, pump, cylinder, tank) are integrated into one unit, reducing installation space and avoiding complex external pipelines that may cause leakage or explosion risks.

Stable & Responsive Performance: Pressure fluctuation ≤±2% ensures consistent thrust output; fast extension/retraction times (≤0.38/0.35 seconds) adapt to high-frequency start-stop cycles (up to 1500 times/hour).

Harsh-Environment Durability: Anti-corrosion epoxy coating (120 μm) on external surfaces, -10°C to 60°C operating temperature range, and dustproof/waterproof design adapt to mines, chemical plants, and oil refineries.

Easy Maintenance: Modular structure allows quick replacement of explosion-proof components (motor, seals, filter) without disassembling the entire unit; the oil tank is equipped with an explosion-proof sight glass for real-time oil level monitoring.

4. Typical Applications

With a 300 N thrust and 50 mm stroke, the ED30/5Ex is optimized for light-to-medium load explosion-proof equipment (load capacity: 5–30 tons) in hazardous industrial sectors:

4.1 Mining Industry

Underground Coal Mine Auxiliary Equipment: Serves as a drive component for explosion-proof brakes in small mine hoists, inclined shaft conveyors, and coal dust collectors. Adapts to underground methane-rich, humid, and dusty environments, ensuring safe braking during material transportation.

Mine Ventilation & Compressor Systems: Drives the braking and control mechanisms of mine ventilation fans and air compressors, eliminating ignition risks from electrical components and ensuring continuous operation of critical mine equipment.

4.2 Chemical & Petroleum Industry

Chemical Plant Material Conveyors: Powers explosion-proof brakes for belt conveyors and screw conveyors in flammable chemical workshops (e.g., methanol, ethylene production lines). Explosion-proof design prevents gas ignition, ensuring safe material transfer.

Oil Refinery Pipeline Valves: Drives the opening/closing mechanisms of small explosion-proof valves in oil refineries and petrochemical plants, resisting oil mist and corrosive gases while maintaining explosion-proof safety.

4.3 Grain & Flour Processing Industry

Grain Silo Elevators & Conveyors: Used in grain processing plants (combustible dust zones: wheat flour, corn starch) to drive brake systems of elevators and conveyors. Explosion-proof protection prevents dust combustion caused by electrical sparks.

Flour Milling Machinery: Powers the braking and positioning mechanisms of flour mills' rotating equipment, ensuring safe operation in high-concentration dust environments.

4.4 General Hazardous Environment Equipment

Explosion-Proof AGVs & Small Transfer Carts: Drives the braking systems of explosion-proof automated guided vehicles (AGVs) and small rail transfer carts in pharmaceutical, paint, or solvent factories, ensuring safe material transportation in flammable vapor environments.

Explosion-Proof Testing & Precision Equipment: Provides linear drive for control mechanisms of explosion-proof test benches and precision instruments in hazardous areas, complying with explosion-proof standards while delivering stable thrust.

 

 

 

 

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