BYT1-125Z/10 Series Explosion-Protected Electro-Hydraulic Thruster

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.

---

Maintenance Guidelines

1. Daily Inspection (5–10 Minutes/Shift)

Oil Level & Quality: Check oil is between MAX/MIN marks; replace if discolored or contaminated.

Leakage: Inspect rod, end cover, and joints for oil drips-tighten or replace seals if needed.

Explosion-Proof Integrity: Ensure enclosure bolts are tight (torque: 25–30 N·m) and flame paths are free of damage.

Electrical Check: Verify motor insulation (≥1 MΩ) and cable connections-no fraying or loose terminals.

2. Periodic Maintenance

Interval	Tasks	Details
1 Month	Lubrication & Fasteners	Grease rod with lithium-based grease; check all bolts (especially explosion-proof joints).
3 Months	Oil Change & Bleeding	Drain old oil, flush with ISO VG46, refill to MAX; bleed air by cycling 3–5 times.
6 Months	Filter & Valve Check	Clean/replace oil filter; inspect check valve and relief valve for blockages.
12 Months	Overhaul	Replace seals, check piston/cylinder wear, test explosion-proof housing, and calibrate thrust.

3. Hazardous Environment Tips

Coal Mines: Use ExdI-rated units; monthly check for dust accumulation-clean with compressed air (max 0.5 MPa).

Petrochemical Plants: Use ExdⅡBT4; avoid oil spills-wipe immediately to prevent vapor ignition.

Low Temperature: Preheat for 5–10 minutes before use; use ISO VG32 oil if temp < -10℃.

---

Common Faults & Solutions

Fault	Possible Causes	Solutions
Rod fails to extend	Low oil level, motor burnout, pump blockage	Refill oil; test motor (replace if faulty); clean/replace pump impeller.
Insufficient thrust	Air in system, worn seals, oil contamination	Bleed air; replace piston seals; change oil and filter.
Slow retraction	Load spring fatigue, oil viscosity too high	Replace spring; use ISO VG46 oil (check temp range).
Motor overheating	Exceeded duty cycle, blocked ventilation	Reduce cycle frequency; clean motor vents (explosion-proof design requires special tools).

---

Safety Precautions

Lockout-Tagout: Cut power and release pressure before maintenance-use approved tools for explosion-proof parts.

Oil Compatibility: Use only ISO VG46 anti-wear oil; mixing brands causes seal damage and voids certification.

No Modifications: Do not drill or alter the explosion-proof enclosure-this invalidates safety ratings.

Training: Only qualified personnel (familiar with Ex equipment) should perform maintenance.

Hot Tags: byt1-125z/10 series explosion-protected electro-hydraulic thruster, China, manufacturers, supplier, factory, customized