SBD425-C Hydraulic Safety Disc Brake | 306kN

 

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1. Product Model Definition & Code Explanation

Full Model No.: SBD425-C Safety Brake

SBD425-C safety brake is a high-power normally closed fail-safe caliper disc brake of SBD-C series, upgraded from the old SBB425 safety brake. It adopts disc-spring applied braking and hydraulic release principle. With 306kN rated clamping force, it is specially installed on the low-speed drum shaft to perform emergency safety braking. It is widely used for port cranes, mine hoists, inclined belt conveyors and large lifting machinery, serving as critical safety protection against load dropping and runaway risks.

Model Code Interpretation:

• SBD: Series code for hydraulic fail-safe safety disc brake
• 425: Series specification code
• C: C type structure, upgraded version, replacing traditional SBB series brake

2. Product Overview

SBD425-C safety brake is a heavy-duty emergency disc brake. Under standby or power/hydraulic failure conditions, high-performance disc springs push the brake pads to clamp the brake disc tightly and realize braking. When the equipment is ready to run, the matched hydraulic power unit supplies pressure to overcome disc spring force and open the brake caliper for release.

It is designed for low-speed drum shaft installation, with fast response and short braking closing time. Non-asbestos high-hardness friction pads deliver stable friction coefficient. Optional monitoring switches including release limit switch and pad wear limit switch can feed back status signals for PLC interlock and fault alarm. The rigid cast caliper body is anti-corrosion and durable, suitable for continuous heavy-load operation in ports, mines, metallurgy and other severe working sites.

3. Core Features & Product Advantages

• Fail-Safe Normally Closed Design, Disc Spring Applied Braking Brake automatically engages once hydraulic pressure is lost. Effectively prevents load falling and equipment runaway when power or hydraulic system fails, maximum safety guarantee for lifting equipment.
• 306kN Heavy Rated Clamping Force Large stable clamping force, suitable for large tonnage hoisting and conveying machinery, reliable emergency braking under heavy load conditions.
• Fast Response & Short Braking Time Optimized disc spring group layout, sensitive action, rapid brake engagement to minimize braking distance and risk.
• Optional Multi-Function Monitoring Switches Available with release limit switch and lining wear limit switch for status feedback, interlock control and early wear warning, convenient for centralized PLC monitoring.
• High-Performance Non-Asbestos Friction Pads Stable friction coefficient, water and salt spray resistance, low wear, less damage to brake disc, easy replacement and long service life.
• Specialized for Low-Speed Drum Shaft Mounting Professional design for drum low-speed shaft emergency braking, widely accepted for port and mining safety braking schemes.
• Upgraded Structure, Interchangeable with SBB425 Direct replacement for old SBB425 safety brake, convenient for renovation and upgrade of existing braking systems.
• Strict Factory Load Test & Complete Documents Each unit undergoes static clamping force test before delivery, with inspection report for customer acceptance and audit.

4. Wide Application Scope

SBD425-C safety brake is dedicated emergency safety braking equipment for heavy industrial machinery:

• Port gantry cranes, container cranes, portal cranes and ship unloaders lifting mechanism low-speed drum shaft
• Mine hoists, inclined belt conveyors and underground heavy conveying machinery
• Metallurgy casting cranes, large overhead cranes and gantry cranes
• Boom pitching mechanism of large cranes and bulk material stacker-reclaimers
• Retrofit projects replacing old SBB425 safety brakes

6. Working Principle

Braking State (Standby / Hydraulic Pressure Loss / Emergency)

When the brake is in standby state or the hydraulic station loses pressure, the preloaded disc spring group pushes the caliper piston, making friction pads clamp both sides of the brake disc tightly. The 306kN clamping force generates large braking torque to lock the drum shaft and stop rotation. This is the default safe state to avoid heavy load dropping and equipment sliding.

Released State (Equipment Running)

When the crane or conveyor is ready to operate, the matched hydraulic station starts to supply pressure. Hydraulic oil enters the brake cylinder and overcomes disc spring force, pushing the piston back and separating brake pads from the disc. The release limit switch sends "brake open" signal to allow the host machine to start. When the equipment stops, the hydraulic pressure is cut off, and the brake engages automatically for safety locking.

7. Product Customization & After-Sales Service

We supply fully assembled and load-tested SBD425-C safety brakes. Custom options include special brake disc size, salt-spray anti-corrosion coating for coastal ports, different voltage hydraulic stations and complete signal monitoring schemes. OEM and ODM services are supported.

We can provide 2D installation drawings, hydraulic circuit diagrams and English operation manuals for customer approval. Factory direct sales with strict quality inspection. We provide professional technical consultation, installation guidance, commissioning, spare parts supply and long-term global after-sales service for port, mining and metallurgy customers.

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