High Quality YFX Series Electro-hydraulic Storm Braking Wedges Brakes

 

1. Series Overview & Core Function

The YFX Series (Y = Hydraulic, F = Storm/Parking, X = Wedge Structure) is classified as a safety-critical crane brake, distinct from standard service brakes. Its primary functions are tailored to extreme conditions and emergency scenarios:

Storm Braking: Securing crane travel mechanisms (trolley, gantry) and hoisting systems against high wind loads, preventing the crane from "running away" or swaying uncontrollably during storms.

Static Load Holding: Maintaining heavy loads (up to 400+ tons) and crane components in fixed positions during downtime, maintenance, or power outages-even under adverse weather.

Emergency Anti-Slip Braking: Automatically engaging when the crane detects overspeed, wind speed exceeding safety limits, or power loss, providing a last line of defense for crane safety.

With wedge-type force amplification and high braking torque (1,000–20,000 N·m), the series is optimized for large cranes in ports, shipyards, and construction sites where environmental conditions are harsh and safety risks are high.

2. Working Principle

The YFX Series operates on an electro-hydraulic wedge amplification principle, combining hydraulic force with mechanical wedge self-locking to generate massive braking torque. Its working cycle includes three key states:

2.1 1. Brake Release (Normal Crane Operation)

When the crane is in normal operation (hoisting, traveling), the control system supplies power to the brake's electro-hydraulic thruster.

The thruster drives a hydraulic cylinder, which pushes a wedge-shaped actuator to disengage from the brake's friction pair. This retracts the friction blocks, creating a gap between the blocks and the crane's braking rail/drum.

The crane's moving components (trolley, gantry) or hoisting drum rotate freely, enabling normal operation.

2.2 2. Brake Engagement (Storm Holding/Emergency)

Storm Holding: When wind speed exceeds the safe threshold (e.g., 15 m/s) or the crane is parked, the thruster loses power. Hydraulic pressure drops, and a high-tension return spring pulls the wedge actuator forward.

Wedge Force Amplification: The wedge slides between two inclined friction surfaces, converting the spring's linear force into amplified clamping force (5–10 times the spring force). This pushes the friction blocks tightly against the braking rail/drum, generating massive braking torque.

Self-Locking Mechanism: The wedge's inclined angle (typically 8°–12°) creates a self-locking effect-once engaged, the braking force increases with external loads (e.g., wind pressure), preventing the wedge from slipping back and ensuring the brake remains locked even if hydraulic pressure is fully lost.

2.3 3. Emergency Braking (Overspeed/Power Loss)

In case of crane overspeed (detected by speed sensors) or sudden power loss, the thruster is instantly de-energized. The return spring and wedge mechanism engage within ≤ 0.5 seconds.

The wedge self-locks, and the friction blocks clamp the braking rail/drum with maximum torque, stopping the crane's movement within a safe distance and preventing slip or displacement.

3. Core Structure & Key Components

The YFX Series features a robust, weather-resistant design with four critical subsystems, optimized for large cranes and harsh environments:

3.1 1. Electro-Hydraulic Actuation Unit (Power Core)

Electro-Hydraulic Thruster: A high-power thruster (motor power: 1.5–5.5 kW) paired with a hydraulic cylinder, designed for high-pressure operation (15–30 MPa). It converts electrical energy into hydraulic force to control wedge engagement/disengagement.

Return Spring Assembly: Multiple high-tension manganese-steel compression springs (total force: 10–50 kN) that provide the primary force for wedge actuation. Their preload is adjustable to fine-tune braking torque.

3.2 2. Wedge Braking Assembly (Force Amplification Core)

Wedge Actuator: A precision-machined steel wedge (hardness: HRC 45–50) with an inclined surface, coated with wear-resistant alloy to reduce friction and extend service life.

Friction Blocks: High-performance composite blocks (semi-metallic + ceramic) with a high friction coefficient (μ ≥ 0.48) and heat resistance up to 450°C. They are bolted to the brake's fixed frame and designed for easy replacement.

Braking Interface: Compatible with two types of crane braking components:

Rail-Mounted: Friction blocks clamp onto the crane's travel rail (common for trolley/gantry brakes).

Drum-Mounted: Friction blocks engage with a large-diameter drum (500–1,500mm) on the hoisting mechanism.

3.3 3. Self-Locking & Adjustment System (Safety Core)

Wedge Self-Locking Mechanism: The wedge's inclined angle and surface roughness are calibrated to ensure self-locking under all design loads, eliminating reliance on external power for holding.

Wear Adjusters: Automatic or manual adjustment screws that compensate for friction block wear, maintaining consistent braking gap (0.5–1.0mm) and avoiding manual re-calibration.

3.4 4. Environmental Protection Components (Durability Core)

Weather-Resistant Housing: The brake's outer casing is made of high-strength cast steel (QT600) with a double-layer epoxy coating (120μm thickness) and stainless steel fasteners, achieving IP65 protection against rain, salt spray, and dust-critical for port and offshore cranes.

Low-Temperature Adaptation: Optional low-temperature seals (FKM material) and heater elements allow operation in -40°C to 80°C, suitable for cold-region construction sites.

4. Key Features & Advantages

The YFX Series is distinguished by its storm-specific design and crane safety focus, with core benefits:

4.1 1. Wedge Force Amplification & Self-Locking

The wedge mechanism amplifies the return spring's force by 5–10 times, enabling the brake to generate ultra-high torque (up to 20,000 N·m) with relatively small spring force. The self-locking function ensures the brake remains engaged even if all power is lost, providing absolute safety during storms.

4.2 2. High Anti-Slip Performance

The friction blocks' high coefficient (μ ≥ 0.48) and large contact area (200–1,000 cm²) ensure strong anti-slip capability-even on wet or dusty braking rails/drums. This prevents the crane from sliding under high wind loads (up to 25 m/s).

4.3 3. Weather & Corrosion Resistance

IP65 protection, salt spray-resistant coating, and stainless steel components make the brake suitable for harsh marine and coastal environments (e.g., port container cranes exposed to saltwater).

4.4 4. Low Maintenance & Long Service Life

The self-locking wedge design reduces reliance on hydraulic pressure for holding, lowering wear on hydraulic components.

Friction blocks have a service life of ≥ 15,000 working hours (under normal conditions), and wear adjusters eliminate frequent manual maintenance.

4.5 5. Compliance with Crane Safety Standards

Meets global crane safety regulations, including ISO 4301-1 (crane brakes), GB/T 6333-2019 (Chinese electro-hydraulic wedge brake standards), and CE (EU Machinery Directive). It also complies with port crane-specific standards (e.g., IEC 60044 for marine cranes).

5. Typical Applications

The YFX Series is purpose-built for large cranes in harsh environments, including:

Port Container Cranes: Rubber-tired gantry cranes (RTGs), rail-mounted gantry cranes (RMGs), and ship-to-shore (STS) cranes-securing against storm winds and holding containers during loading/unloading.

Shipyard Gantry Cranes: Large gantry cranes for shipbuilding, handling heavy hull sections and components-resisting saltwater corrosion and high winds.

Tower Cranes (High-Rise Construction): Tall tower cranes in coastal or windy regions-preventing tower sway and securing the jib during storms.

Offshore Cranes: Platform cranes for oil and gas operations-withstanding marine environments and emergency load holding during rough seas.

 

 

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