The BYT1-25Z/4 is an explosion-protected electro-hydraulic thruster from the BYT1 series, engineered for safe and reliable linear drive in hazardous industrial environments. It holds explosion-proof certification (Ex d IIC T4 Gb/Ex tD A21 IP65 T135°C, compliant with GB 3836/IEC 60079 standards), featuring a rated thrust of 25 kN and a rated stroke of 40 mm (model suffix "4" denotes 40 mm). Designed with a modular integrated structure, sensitive response, and explosion-proof protection, it serves as a core power source for braking, clamping, and control mechanisms in flammable, explosive, or dust-laden workplaces. Details are as follows:
1. Working Principle
The thruster integrates an explosion-protected motor, hydraulic pump, cylinder, oil tank, and spring reset mechanism, operating on the logic of "electric-hydraulic drive for extension + spring reset for retraction." The working process is divided into three core stages, with explosion-proof design integrated throughout:
1.1 Power-On Extension (Thrust Output)
When connected to the rated explosion-proof power supply (380V three-phase AC, 50Hz), the Ex d IIC T4 explosion-protected asynchronous motor (power: 1.1 kW) 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: 15 L) through a 10 μm precision filter, pressurizing it to 12–16 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 40 mm stroke, it stably outputs 25 kN rated thrust, transmitting force to matched mechanisms (e.g., explosion-proof brakes, clamping devices) via the top connector to complete release or activation actions.
The rated extension time is ≤0.45 seconds, ensuring rapid response to equipment control signals.
1.2 Power-Off Retraction (Reset)
When the power is cut off or the control signal terminates, the explosion-protected motor stops, and the hydraulic pump ceases pressure supply. The built-in pressure relief valve (max pressure ≤18 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 explosion-proof mechanism to reset (e.g., brake engagement, clamp locking).
The rated retraction time is ≤0.4 seconds, supporting quick fail-safe braking in hazardous environments.
1.3 Explosion-Proof & Stability Guarantees
Explosion-Protected Structure: The motor adopts a flameproof enclosure (Ex d) with a minimum explosion-proof gap of ≤0.2 mm, preventing internal sparks from igniting external flammable gases/dust. All electrical connections use explosion-proof cable glands (IP65) to avoid gas intrusion.
Pressure & Temperature Control: A pressure compensator maintains system pressure fluctuation ≤±2%, ensuring stable thrust; the motor's T4 temperature class limits surface temperature ≤135°C, eliminating ignition risks for flammable substances.
Anti-Leakage & Dustproof: The cylinder uses FKM high-pressure explosion-proof seals (pressure resistance ≥20 MPa) to prevent oil leakage; the entire unit meets IP65 protection, resisting dust and water splashes in harsh hazardous environments.
Status Feedback: Integrated explosion-proof position sensors (Ex ia IIC T4) output "extended" and "retracted" signals, enabling interlock control with host equipment (host starts only when the thruster is in place) to avoid misoperation.
2. Core Features
Explosion-Proof Reliability: Complies with national/international explosion-proof standards, suitable for Zone 1/2 (gas) and Zone 21/22 (dust) hazardous areas, adapting to environments with flammable gases (methane, propane) or combustible dust (coal dust, grain dust).
Compact Integration: All components (explosion-protected motor, pump, cylinder, tank) are integrated into one unit, reducing installation space and avoiding complex external pipelines that may cause leakage or explosion hazards.
Stable Performance: Explosion-proof motor with F-class insulation and thermal protection (cuts off power at 155°C) prevents burnout; dual-filter design (suction + return) extends oil service life to 2,000 working hours.
Wide Environmental Adaptability: Operating temperature range: -10°C to 60°C; anti-corrosion epoxy coating (120 μm) on external surfaces resists humidity and mild corrosion, suitable for chemical plants, coal mines, and oil refineries.
Easy Maintenance: Modular design 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.
3. Typical Applications
With a 25 kN thrust and 40 mm stroke, the BYT1-25Z/4 is optimized for medium-load explosion-proof equipment (load capacity: 10–50 tons) in hazardous industrial sectors:
3.1 Coal Mine & Mining Machinery
Underground Coal Mine Hoists & Belt Conveyors: Serves as the drive component for explosion-proof brakes in underground coal mines (methane-rich, coal dust-laden environment). Stable thrust controls brake release/engagement during coal transportation, preventing gas ignition risks from electrical sparks.
Mine Inclined Shaft Winches: Drives the braking mechanism of small-to-medium mine winches, adapting to humid, dusty underground conditions. Quick retraction (≤0.4 seconds) ensures emergency braking in case of power failure, avoiding coal spillage or equipment runaway.
3.2 Chemical & Petroleum Industry
Chemical Plant Conveyors & Valve Control: Powers explosion-proof brakes and valve actuators in chemical workshops (flammable gas/vapor environments, e.g., ethylene, methanol production lines). Explosion-proof design eliminates ignition sources, ensuring safe operation of material conveying and fluid control systems.
Oil Refinery Loading/Unloading Equipment: Drives clamping and braking mechanisms of oil tank truck loading arms and pipeline valves, resisting oil mist and corrosive gases while maintaining explosion-proof safety.
3.3 Grain & Flour Processing Industry
Grain Silo Conveyors & Elevators: Used in grain processing plants (combustible dust zones: wheat flour, corn starch). Explosion-proof protection prevents dust combustion caused by electrical components; stable thrust controls the braking of grain conveyors and elevators, avoiding dust explosion hazards.
3.4 Other Hazardous Environment Equipment
Explosion-Proof AGVs & Material Transfer Carts: Powers the braking and positioning mechanisms of explosion-proof automated guided vehicles (AGVs) in pharmaceutical, paint, or solvent workshops, ensuring safe material transportation in flammable vapor environments.
Explosion-Proof Testing Equipment: Drives control mechanisms of explosion-proof test benches and precision instruments in hazardous areas, providing stable linear thrust while complying with explosion-proof safety requirements.
