The YWZ8-700/E301 Series Electro-hydraulic drum brakes are a robust, fail-safe braking system designed for industrial applications requiring reliable stopping and holding force. Here is a description of their main features and operation:
Operating Principle:
This series functions on a spring-applied, electrically released principle, ensuring a fail-safe operation. The core actuator is an electro-hydraulic thruster (E301 model). Here is how it works:
Release: When the thruster's electric motor is energized, it drives a centrifugal pump to generate hydraulic pressure. This pressure pushes a piston, which compresses the internal brake springs and retracts the brake shoes via a lever mechanism, releasing the brake.
Apply (Fail-Safe): When power is cut off, the hydraulic pressure dissipates. The force of the compressed brake springs immediately forces the brake shoes outward against the inner surface of the rotating drum, automatically applying the braking force. This ensures the brake engages during a power failure or emergency stop.
Key Features:
Model Designation:
YWZ8: Indicates the brake series and frame size.
700: Typically denotes the rated static braking torque (e.g., 700 Nm).
/E301: Specifies the model of the integrated electro-hydraulic thruster, which provides the actuation force.
High Torque: The 700 Nm rating provides substantial braking force suitable for medium to heavy-duty industrial drives.
Electro-hydraulic Thruster (E301): This actuator provides smooth, cushioned engagement and disengagement, reducing mechanical shock and wear. It offers quieter operation and better controllability compared to purely electromagnetic thrusters.
Automatic Wear Compensation: Most models include an automatic adjustment device that maintains the optimal brake shoe gap as the friction linings wear, ensuring consistent performance and reducing the need for manual adjustment.
Drum Brake Design: Utilizes internal expanding shoes for effective torque transmission and good heat dissipation via the brake drum.
Robust Construction: Built with heavy-duty cast iron or steel components for high durability in demanding environments (dust, moisture, temperature variations).
Typical Applications:
These brakes are commonly installed on the travel or trolley mechanisms of:
Overhead cranes and gantry cranes.
Portal cranes and other material handling equipment.
Winches, conveyors, and mining machinery drives.
Summary:
The YWZ8-700/E301 is a reliable, fail-safe industrial drum brake. It combines the safety of a spring-applied mechanism with the smooth, powerful actuation of an electro-hydraulic thruster, making it a preferred choice for applications where controlled stopping, secure holding, and operational safety are critical.
