YW-L250/E30 Series Electro-Hydraulic Drum Brake

The YW-L250/E30 series electro-hydraulic drum brake is a compact, standardized braking device tailored for medium-load industrial equipment with limited installation space. It exclusively pairs with the ED30/5 electro-hydraulic thruster (compliant with DIN15430 standard) and adheres to JB/T6406-2006 (connection dimensions) and DIN15435 (braking torque parameters). Its core advantages include space-saving design, automatic wear compensation, and non-asbestos linings, making it ideal for non-explosive environments like lifting transport, port loading, metallurgical equipment, and construction machinery-especially scenarios where YW, YWZ9, or YWZ4 series brakes cannot fit.

Core Technical Specifications

Key Structural & Functional Features

Space-Saving Compact DesignOptimized for scenarios with limited installation space (where YW/YWZ9/YWZ4 series are incompatible). The integrated layout of the brake body and thruster interface reduces the overall footprint by ~30% compared to conventional drum brakes, making it suitable for small hoists, compact conveyors, and narrow-section port machinery.

Automatic Wear Compensation MechanismThe main pendulum hinge is equipped with an automatic compensation device. As the non-asbestos lining wears during use, the mechanism dynamically adjusts the brake shoe position to maintain a stable shoe-drum clearance (no manual adjustment required). This ensures consistent braking torque and extends the time between maintenance cycles.

Eco-Friendly Non-Asbestos LiningsAdopts non-asbestos friction linings that meet environmental standards-free of harmful substances (e.g., asbestos) and low in dust emissions. The linings also have strong wear resistance (service life ≥3000 working hours under standard conditions) and stable friction performance at high temperatures (fading ≤15% at 200℃).

Optional Retreat Devices for VersatilitySupports installation of additional retreat devices (e.g., manual release handles, emergency retractors) per user needs. For example, the manual release function allows equipment to be moved manually during power failure or maintenance, improving operational flexibility.

Working Principle (Electro-Hydraulic Release + Spring Braking)

Consistent with the functional logic of YW series brakes (Summaries 2, 4, 6), the YW-L250/E30 operates in the "power-on release, power-off braking" mode:

Power-On Release (Equipment Operation)When the control system supplies power to the ED30/5 thruster, its motor drives the internal centrifugal pump to generate hydraulic pressure. High-pressure oil pushes the thruster's push rod to extend, which acts on the brake's lever mechanism. The lever overcomes the pre-tightening force of the braking spring, driving the two brake arms to swing outward. The non-asbestos linings separate from the 250 mm-diameter drum, and the brake is released-allowing the equipment to run normally.

Power-Off Braking (Equipment Stop/Emergency)When the equipment needs to stop or loses power, the thruster loses hydraulic pressure. The braking spring rebounds instantly, pulling the brake arms to swing inward. The friction linings clamp the rotating drum tightly, converting the equipment's kinetic energy into heat (dissipated into the air) through friction. The 380 N·m rated braking torque quickly decelerates the drum, ensuring stable stopping. During this process, the automatic wear compensation mechanism adjusts the lining position in real time to avoid torque loss due to wear.

Typical Applications (Aligned with YW-L Series Scenarios)

Based on Summaries 1 and 5, the YW-L250/E30 is widely used in the following scenarios:

Lifting & Transport Equipment

Small-tonnage bridge cranes, jib cranes, and electric hoists (especially those with narrow beam spaces). It provides deceleration and parking braking for the lifting mechanism, ensuring safe suspension of loads.

Workshop material transfer trolleys and rail-guided vehicles (RGVs) with limited undercarriage space-its compact design fits easily into narrow mounting areas.

Port & Loading Machinery

Small port loaders, container stacking auxiliary equipment, and conveyor belt end drives. It adapts to the dusty, humid port environment (IP54 protection) and ensures stable braking during material loading/unloading.

Metallurgical & Construction Machinery

Metallurgical auxiliary equipment (e.g., blast furnace charging trolleys, small rolling mill feeders) that requires high-temperature resistance (stable performance at ≤40℃ ambient temperature).

Construction site small tower cranes and concrete mixers-its non-asbestos linings avoid environmental pollution on construction sites, complying with green construction requirements.

Installation & Maintenance Guidelines

Installation Key Points

Dimension Alignment: Follow JB/T6406-2006 to align the brake's mounting holes with the equipment interface. Ensure the drum diameter is exactly 250 mm (mismatch will cause uneven lining wear).

Thruster Matching: Mount the ED30/5 thruster vertically, ensuring its push rod is coaxial with the brake lever's force application point (lateral deviation ≤1 mm) to avoid lever jamming.

Clearance Check: After installation, power on/off the thruster 2–3 times to activate the automatic compensation mechanism. Use a feeler gauge to confirm the shoe-drum clearance is 0.8–1.2 mm (no manual adjustment needed).

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