SBD250-A Safety Brake

SBD250-A Safety brake

The SBD250-A is a heavy-duty Hydraulic Safety (Emergency) Brake. It is a fail-safe braking device designed for large-scale industrial machinery. Unlike standard service brakes, the SBD250-A is typically installed on the low-speed shaft (drum shaft) of heavy equipment to provide emergency stopping power or to hold loads securely.

The model number breakdown is as follows:

SBD: The series designation for Hydraulic Safety Brakes (often disc type).

250: The Total Clamping Force of 250 kN (Kilonewtons), which is approximately 25 tons of force.

A: The design variant (Series A), indicating specific mounting dimensions and internal mechanics.

💡 Key Features & Characteristics

Fail-Safe Operation (Spring-Applied, Hydraulic-Release):
The SBD250-A operates on a "normally closed" principle for maximum safety.

Braking: When the hydraulic system is depressurized (power off), high-strength 碟簧 (disc springs) force the brake calipers to clamp the disc, stopping the machine.

Release: To allow movement, a hydraulic power unit (HPU) pumps oil into the cylinder to overcome the spring force and open the jaws.

High Clamping Force:
With a total clamping force of 250 kN (and a braking force of approx. 180 kN), this unit is capable of arresting massive loads instantly, making it ideal for emergency situations.

Disc Brake Design:
It is a caliper disc brake, which offers better heat dissipation and stability compared to drum brakes. The braking torque is generated by friction pads clamping onto a rotating disc.

Smart Monitoring (Optional):
The unit can be equipped with limit switches for safety interlocks:

Open-Gap Switch: Confirms the brake is fully released before the motor starts.

Wear Limit Switch: Alerts operators when the friction pads are worn and need replacement.

Environmental Resistance:

Pads: Uses high-performance, asbestos-free friction pads that are stable in wet or salty conditions (suitable for port environments).

Seals: Features reasonable sealing structures (often using imported seals) to prevent hydraulic leaks and extend service life.

🏭 Typical Applications

The SBD250-A is widely used in heavy industries for safety and emergency braking:

Port Machinery: Ship-to-shore cranes, container cranes, and portal cranes (specifically on the hoist or boom mechanisms).

Mining: Mine hoists, winches, and elevators (as a safety catch).

Construction: Large tower cranes and construction hoists.

Material Handling: Cable cars, ropeways, and heavy-duty belt conveyors (especially inclined ones).

📋 General Technical Specifications

表格

Note: The SBD250-A is distinct from service brakes (like the YWZ series) because it is designed to handle static holding and emergency stops rather than frequent cycling. It is almost always paired with a dedicated Hydraulic Power Unit (HPU) to manage the release pressure. When installing, ensure the brake disc thickness and diameter match the caliper's capacity.

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