The SBD315‑A is a 315 kN clamping force, normally closed, spring‑applied, hydraulically released hydraulic disc safety brake-a fail‑safe device for low‑speed shafts of heavy industrial equipment like cranes, mining hoists, and inclined conveyors, with stable non‑asbestos friction linings and optional safety interlock switches.
Core Specifications
| Parameter | Value |
|---|---|
| Clamping force | 315 kN |
| Brake type | Normally closed, spring‑applied, hydraulically released disc brake |
| Applicable disc diameter | 1600–1800 mm (typical) |
| Disc thickness | 25–30 mm |
| Operating pressure | 16–21 MPa |
| Release clearance | 0.75–1.25 mm |
| Response time (closing) | ≤ 0.8 s |
| Friction lining | Non‑asbestos hard material, μ ≈ 0.36 |
| Protection | IP65 |
| Ambient temp | -20 °C to +60 °C |
| Weight | ~235–280 kg |
| Safety switches | Optional release limit + lining wear limit (PLC‑interlockable) |
Structure & Working Principle
Structure: Symmetric two‑caliper design with disc springs, hydraulic cylinders, piston assemblies, brake shoes, and optional 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.
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: Optional 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.
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.
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.
2 years: Inspect disc spring elasticity (replace if fatigued); conduct a full‑system pressure retention test (pressure drop ≤ 0.5 MPa within 10 minutes); replace all hydraulic hoses.
Never modify safety‑related components; use original spare parts.
