Description

Product Overview

Hydraulic Safety Brake is a spring-applied, hydraulic-release braking system used for emergency stopping and static holding of mine hoists, conveyors, wind drives, cranes, and other high-inertia equipment.

Key Performance Features

Brake Force Remains Available During Power Loss
Disc clamping force is generated by stacked compression springs rather than hydraulic output. Hydraulic pressure is only used for release, allowing automatic brake engagement within the designed response range during power interruption.

Stable Force Distribution Across Friction Surface
Brake arms and pressure plates are machined and assembled with parallelism control to maintain pad contact consistency and reduce localized edge loading during repeated stops.

Controlled Release Without Pressure Shock
Cylinder ports integrate throttled oil return to reduce release impact and limit sudden pad separation that accelerates lining wear.

Reduced Mechanical Clearance Drift
Guide columns and moving interfaces use hardened and ground contact surfaces to maintain repeatable release travel after long-cycle operation.

Manufacturing & Quality Control

Component	Process Control	Verification Data
Hydraulic Cylinder	Honed internal bore	Surface roughness Ra ≤0.8 μm
Spring Assembly	Preload grouping before assembly	Force deviation ≤5% per brake set
Brake Arms	CNC-machined critical interfaces	Parallelism ≤0.05 mm
Friction Plate	Ground contact surfaces	Flatness ≤0.10 mm
Final Assembly	Brake force calibration	Functional stroke record

Optional Configurations

Category	Available Options
Release Mode	Hydraulic station / Integrated cylinder
Friction Material	Semi-metallic / Sintered
Monitoring	Pressure switch / Position switch
Protection	Outdoor coating / Corrosion-resistant treatment
Maintenance	Manual release device

Model Designation Explanation

product-1001-568

Overall Dimensions and Mounting Specifications

product-1200-932

Installation diagram

product-1434-1113

Braking torque: M=μ × d1 × F (Nm)
In the formula: μ - Calculated friction coefficient μ=0.35 d1- Calculated friction diameter of the brake disc, d1=D-130(mm) F-Total clamping force during braking (kN)
Note: 1) This formula applies to brake discs with a diameter ranging from 800 mm to 1800 mm. For brake discs of other diameters, please contact us directly.2) d2 is the maximum allowable outer diameter of the drum or connecting hub, d2=D-270(mm)

SBD-A series safety brake size and technical parameters

Product model	Total clamping force	Braking force	Working pressure of oil cylinder	Open valve oil volume	Opening gap	weight	A(mm)	C(mm)	d1(mm)	d2max (mm)	D(mm)
SBD100-A	100	72	70	70	0.75-1.5	195	0.171×ΦD+220	0.470×ΦD-127	ΦD-135	ΦD-127	Φ800≤ΦD ≤Φ1800
SBD125-A	125	90	90	90	0.75-1.5	195
SBD160-A	160	115	110	110	0.75-1.25	195
SBD200-A	200	144	100	100	0.75-1.5	235

SBD250-A	250	180	120	120	0.75-1.25	235

Note: The SBD□-A series safety brake is an updated variant of the original SBD series safety brake.

Site Maintenance

Maintain release pressure within design range and monitor pressure fluctuation.

Replace friction linings in matched sets.

Inspect guide movement and spring preload during shutdown maintenance.

Check disc runout periodically to avoid uneven contact.

FAQ

Q: How is braking torque selected for different inertia loads?

A: Brake sizing is based on total rotating inertia (GD²), stopping time, allowable deceleration, shaft speed, and service factor rather than motor power alone. Engineering selection normally includes thermal verification for repeated braking conditions.

Q: Can hydraulic safety brakes be installed vertically or upside down?

A: Yes, but mounting orientation affects cylinder venting, spring preload direction, and guide lubrication. Vertical installations generally require orientation-specific sealing and drainage design.

Q: What determines friction lining replacement intervals?

A: Wear life is influenced by braking energy per cycle, disc surface condition, engagement frequency, and ambient contamination. Lining thickness should be monitored against service limits instead of fixed operating hours.

Q: Is brake torque adjustable after installation?

A: For adjustable models, torque can be modified through calibrated spring compression settings or replacement spring packs while maintaining the specified release stroke.

Q: How does ambient temperature affect brake performance?

A: Low temperatures may increase hydraulic oil viscosity and release time, while elevated temperatures accelerate seal aging and friction coefficient variation. Oil grade and seal materials should match site conditions.

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