ED121/12 Flameproof Brake Thruster | 1250N 120mm

ED121/12 Explosion-Protected Electro-Hydraulic Thruster Full Product Details

1. Product Model Definition & Code Explanation

Full Model No.: ED121/12 Explosion-Protected Electro-Hydraulic Thruster

ED121/12 explosion-protected electro-hydraulic thruster is the flameproof version of classic ED series brake actuator. It is widely adopted as the driving unit for explosion-proof drum brakes and block brakes in flammable gas and dust hazardous areas. It features reliable flameproof enclosure, 1250N rated thrust and extra-long 120mm stroke, with power-off automatic retraction fail-safe function. It can directly replace standard ED121/12 thruster and is a preferred actuator for underground coal mines and chemical hazardous sites.

Model Code Interpretation:

• ED: Electro-hydraulic thruster series
• 121: Rated thrust: 1250N
• 12: Rated working stroke: 120mm (long stroke design)

2. Product Overview

ED121/12 flameproof electro-hydraulic thruster adopts integrated structure of flameproof motor, centrifugal hydraulic pump and oil cylinder. The flameproof housing isolates internal electric sparks and arcs to prevent ignition of explosive gas mixtures. When energized, the hydraulic pump builds pressure to extend the piston rod and release the spring brake. Once power fails, hydraulic pressure disappears rapidly; the piston rod retracts automatically driven by brake spring for emergency braking.

Thanks to its 120mm long stroke, it is suitable for brakes requiring large opening displacement. Reinforced sealing and anti-corrosion treatment enable stable cyclic operation in humid, dusty underground mine environments. It matches perfectly with multiple types of explosion-proof drum brakes and block brakes for conveyors, hoists and winches.

3. Core Features & Product Advantages

• Certified Flameproof Explosion-Proof Construction Flameproof enclosure with Ex d I Mb, Ex d IIB T4 mark, effectively blocking internal sparks, safe for methane coal mines and chemical explosive hazardous zones.
• 1250N Stable Thrust & 120mm Long Stroke Unique long-stroke design, provides sufficient opening travel for large-size explosion-proof brakes, smooth thrust output without jitter.
• Fail-Safe Emergency Braking Upon Power Loss Instant pressure relief and automatic retraction after power cut. Cooperates with brake spring for rapid stop to avoid runaway of mining conveyors and hoists.
• High Interchangeability with Standard ED121/12 Identical installation dimensions to ordinary non-explosion-proof ED121/12, convenient for old braking system renovation and upgrade to flameproof version.
• Optimized Hydraulic Circuit for Frequent Operation Low heat generation and small vibration, adapted to high-frequency start-stop working cycles of mining machinery, stable and durable.
• Strong Resistance to Severe Underground Environment Heavy-duty sealing and anti-corrosion coating, good tolerance to coal dust, water mist and high humidity underground.
• Wide Compatibility for Explosion-Proof Brake Systems Suitable for supporting explosion-proof drum brakes and block brakes used on belt conveyors, scraper conveyors and mine hoisting winches.
• Complete Explosion-Proof Document Support Can supply explosion-proof certificate, factory pressure test report and inspection documents for customer acceptance and audit.

4. Wide Application Scope

ED121/12 explosion-protected electro-hydraulic thruster is designed for safety braking actuators in explosive hazardous locations:

• Underground coal mine belt conveyors, scraper conveyors and hoisting winch braking systems
• Chemical workshops and production areas with flammable and explosive gas mixtures
• Explosion-proof drum brakes and block brakes that require long opening stroke
• Mining transfer carts, underground flameproof cranes and lifting machinery
• Retrofit projects replacing conventional ED121/12 thrusters for explosion-proof upgrade

5. Detailed Technical Parameters

6. Working Principle

Energized Release State (Normal Operation)

When mining equipment such as belt conveyor or hoist is ready to run, the ED121/12 thruster is energized. The flameproof motor drives the built-in hydraulic pump to build stable hydraulic pressure. Hydraulic oil pushes the piston rod to extend, outputting rated thrust to compress the brake spring and separate brake shoes from the brake drum or disc. The brake is released and the machine can run normally. The flameproof housing continuously isolates internal electric sparks.

Power-off Braking State (Emergency & Standby)

When the machine stops or power supply is interrupted, the flameproof motor stops immediately and hydraulic pressure drops quickly. Driven by the preloaded brake spring, the piston rod retracts rapidly. The brake friction components clamp tightly to realize reliable emergency braking, preventing equipment sliding and runaway risks in explosive hazardous zones.

7. Product Customization & After-Sales Service

We supply fully pressure-tested ED121/12 explosion-protected electro-hydraulic thrusters with complete explosion-proof certificates. Customization options include special working voltage, high-temperature resistant hydraulic oil and special anti-corrosion treatment. OEM and ODM services are supported.

We can provide technical drawings, English operation manuals and full certification documents for customer approval. Factory direct sales with strict quality inspection. We provide professional technical consultation, installation and commissioning guidance, spare parts supply and long-term global after-sales service for mining and chemical customers.

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