The BYT1-125Z/10 Series Explosion-Protected Electro-Hydraulic Thruster is an Ex-rated linear actuator designed for hazardous environments (coal mines, petrochemicals, etc.), primarily to operate external block brakes, valves, and lever mechanisms. It complies with GB3836.2-2000 with explosion-proof marking ExdI (coal mines) and ExdⅡBT4 (ⅡA/ⅡB gas zones, T1-T4 temperature classes). Below is a structured overview of its specs, structure, operation, maintenance, and troubleshooting.
Core Technical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Rated Thrust | 1250 N (125 kgf) | Standard for 125 series |
| Rated Stroke | 100 mm | "10" in model denotes stroke (×10 mm) |
| Motor | 0.75 kW, 3-phase AC 380V/50Hz | Explosion-proof enclosure, IP55 |
| Action Time (Up/Down) | 0.7 s / 0.6 s | Fast response for braking systems |
| Max Cycles/Hour | 720 | High-frequency operation capability |
| Hydraulic Oil | ISO VG46 anti-wear | Temp range: -20℃ to +40℃ |
| Protection | Explosion-proof (ExdⅡBT4), thermal overload | Safety for flammable atmospheres |
| Weight | ~40 kg | Compact, vertical installation |
Structural Features
Explosion-Proof Design
Flameproof enclosure with precision-machined joints (flame paths) to contain internal explosions and prevent external ignition.
Motor windings and electrical components are encapsulated to avoid sparking in hazardous zones.
Integrated Hydraulic System
Combines motor, centrifugal pump, cylinder, and return spring in a sealed unit. No external pipes-reduces leakage and contamination risks.
Load spring (optional) enables rapid reset when power is cut, critical for fail-safe braking.
Sealing & Corrosion Resistance
Nitrile rubber seals (FKM optional) for oil retention; surface anti-corrosion coating for harsh environments.
Dust cover on the push rod to prevent debris ingress.
Working Principle
Extension (Brake Release)
When powered, the motor drives the impeller to generate hydraulic pressure, pushing the piston and rod upward. This compresses the brake spring via a lever, releasing the brake.
Retraction (Brake Application)
On power failure, the impeller stops. The load spring and gravity force the piston down, returning oil to the upper chamber. The brake engages automatically.
Explosion-Proof Safety
All electrical parts are isolated in flameproof housings. Any internal ignition is contained within the enclosure, preventing propagation to the external atmosphere.
