SB315 Safety Brake

The SB315 is a 315 kN clamping force, normally closed fail-safe hydraulic disc brake (spring-applied, hydraulically released), engineered for emergency safety braking on low-speed shafts of heavy industrial equipment like cranes, hoists, and mining conveyors, with interlocking safety switches and stable non-asbestos friction linings.

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Core Specifications

Parameter	Value
Clamping force	315 kN
Brake type	Normally closed, spring-applied, hydraulically released disc brake
Applicable disc diameter	≥ 1800 mm (typical)
Disc thickness	25–40 mm (standard)
Operating pressure	16–21 MPa
Response time (closing)	≤ 0.8 s
Friction lining	Non-asbestos hard material, stable μ ≈ 0.4
Protection	IP65 (sealed design)
Ambient temp	-20 °C to +60 °C
Weight	~280–320 kg
Safety switches	Release limit + lining wear limit (PLC-interlockable)

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Structure & Working Principle

Structure: Symmetric two-caliper design with disc springs, hydraulic cylinders, piston assemblies, brake shoes, and safety switches; uses imported seals for long life.

Fail-Safe Operation:

Power-on (pressure applied): Hydraulic oil pushes pistons outward, compressing disc springs to retract shoes and release the brake.

Power-off (pressure lost): Disc springs expand, pushing shoes against the disc to engage the brake.

Safety switches signal brake status and lining wear for interlock protection.

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Key Advantages

Fail-safe reliability: Normally closed design ensures braking if power/hydraulics fail.

High performance: Stable friction coefficient; water/salt spray-insensitive linings for harsh environments.

Smart safety: Built-in limit switches enable real-time monitoring and PLC interlocks.

Durable sealing: Premium seals minimize leakage and extend service life.

Easy maintenance: Modular design allows quick lining replacement and adjustment.

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Applications

Primary: Emergency safety braking for low-speed shafts of large/medium cranes, port handling machinery, and mining hoists.

Secondary: Working/emergency braking for inclined belt conveyors, cable cranes, and heavy material handling systems in harsh industrial settings.

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Installation & Maintenance

Installation:

Mount on a rigid base; ensure disc concentricity (runout ≤ 0.15 mm) and parallelism with brake shoes.

Use compatible hydraulic hoses and proper fittings; bleed air from the system before commissioning.

Connect safety switches to the control system for interlock protection.

Maintenance:

Daily: Check hydraulic pressure, leaks, and switch status; clean surface and air breather.

3 months: Inspect oil quality; replace if contaminated.

6 months: Check lining thickness (replace if < 5 mm); verify seal integrity.

12 months: Overhaul cylinders; check disc surface for wear; calibrate safety switches.

Never modify safety-related components; use original spare parts.

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Common Faults & Fixes

Fault	Possible Cause	Repair
Weak braking	Worn liners, low spring force, or hydraulic leakage	Replace liners; adjust springs; repair seals
Brake won't release	Low hydraulic pressure, stuck piston, or misalignment	Check pressure; clean piston; realign calipers
Unstable torque	Uneven disc wear, spring fatigue, or contaminated oil	Resurface disc; replace springs; change oil
Switch failure	Damaged wiring, loose connections, or faulty switches	Repair wiring; tighten connections; replace switches

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Safety & Compliance

Complies with ISO 9001, GB/T 18153-2012, and relevant industrial safety standards.

Follow lockout-tagout (LOTO) procedures during maintenance to prevent accidental activation.

Regularly test safety switches and interlocks to ensure proper function.

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