SB250-2200*40RL Safety Brake

SB250-2200*40RL Safety Brake

The SB250-2200×40RL is a heavy-duty industrial safety brake engineered for critical stopping, load-holding, and emergency protection of large rotating machinery-including heavy-duty conveyors, mine hoists, port cranes, and metallurgical rolling mills. Classified as a fail-safe, spring-engaged brake, it combines high braking torque, robust structural design, and reliable emergency response to prevent machinery runaway in high-risk operations. The model designation (SB250-2200×40RL) indicates its core parameters: "SB" for Safety Brake, "250" for nominal braking torque (250 kN・m), "2200" for brake disc diameter (2200 mm), "40" for disc thickness (40 mm), and "RL" for right-left dual-mounting compatibility. Widely used in mining, ports, and steel production, it ensures operational safety under heavy loads (500–2000 tons) and harsh environments (dust, vibration, high temperatures).

1. Model Interpretation & Core Function

The SB250-2200×40RL's model code directly reflects its design parameters and functional orientation, making it easy to match machinery requirements:

Its core functions are tailored to safety-critical scenarios:

Emergency Stopping: Rapidly decelerating or stopping machinery within ≤ 2 seconds under rated load (e.g., mine hoists overspeeding, conveyor blockages).

Static Load Holding: Securing heavy loads (e.g., crane hooks, hoisted ore) in place during downtime, maintenance, or power outages-preventing accidental movement.

Overload Protection: Automatically engaging when machinery exceeds rated speed or torque (via speed/torque sensors), acting as a final safety barrier to avoid structural damage.

2. Working Principle

The SB250-2200×40RL operates on a fail-safe principle (spring-engaged, hydraulic/pneumatic released), ensuring braking capability even if the power system fails. Its working cycle includes three key states:

2.1 1. Brake Engagement (Safety State)

When the machinery is stationary, in emergency, or powered off, the brake's internal high-tension disc springs (total force: 80–120 kN) expand.

The springs push the brake calipers (dual-sided) toward the rotating brake disc, clamping the disc between high-friction brake pads.

Friction between the pads and disc generates 250 kN·m of braking torque, stopping the disc (and connected machinery shaft) or holding it stationary.

2.2 2. Brake Release (Operating State)

When the machinery needs to run, the control system supplies hydraulic pressure (16–25 MPa) or compressed air (0.6–1.0 MPa) to the brake's actuation cylinders.

Hydraulic/pneumatic force overcomes the disc spring tension, pulling the calipers away from the brake disc and creating a 0.5–1.0 mm clearance.

The brake disc rotates freely with the machinery shaft, enabling normal operation (e.g., conveyor movement, hoist lifting).

2.3 3. Emergency Response (Fault State)

In case of power loss, hydraulic/pneumatic system leakage, or overspeed (detected by a speed sensor), the actuation force instantly dissipates.

Disc springs expand within ≤ 0.3 seconds, driving the calipers to clamp the disc-generating peak braking torque to stop the machinery before accidents occur.

The SB250-2200×40RL combines high torque output, fail-safe design, and harsh-environment resilience, making it a critical safety component for heavy-duty rotating machinery-where operational safety and reliability directly impact productivity and personnel protection.

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