The YWZ9-710/E201 Series Electro-hydraulic drum brakes are a type of spring-applied, fail-safe industrial braking system. Here is a description of their main features and operating principles:
Operating Principle:
This brake series operates on a fail-safe, spring-applied design. Its actuation is provided by an electro-hydraulic thruster (E201 model). The working sequence is as follows:
Release: When the thruster's electric motor is powered, it drives a centrifugal pump. The generated hydraulic pressure pushes a piston, which in turn compresses the main brake springs. This action retracts the brake shoes from the drum via a lever system, releasing the brake.
Apply (Automatic Safety Engagement): When electrical power is interrupted, the hydraulic pressure in the thruster drops. The force of the compressed brake springs is immediately released, forcing the brake shoes outward against the inner surface of the brake drum. This provides automatic braking without any external power, ensuring safety.
Key Features:
Model Designation:
YWZ9: Denotes the brake series and physical frame size.
710: Typically indicates the rated static braking torque (e.g., 710 Nm).
/E201: Specifies the model of the integrated electro-hydraulic thruster, which differs from the E301 in size, thrust force, or stroke.
Electro-hydraulic Thruster (E201): Provides smooth and cushioned actuation. The hydraulic action absorbs engagement shocks, reduces noise, and allows for adjustable braking response. The E201 is a specific model with defined thrust and stroke characteristics.
High Torque & Holding Force: The 710 Nm rating provides reliable stopping and secure holding for substantial inertial loads.
Automatic Wear Compensation: Most models are equipped with an automatic clearance adjustment device. This mechanism maintains the optimal air gap between the brake shoes and the drum as the friction linings wear, ensuring consistent brake performance and minimizing maintenance downtime.
Durable Drum Brake Design: Uses internal expanding shoes for effective force transmission. The brake drum aids in heat dissipation.
Robust Construction: Built with heavy-duty materials like cast iron for the shoes, lever, and base, making it suitable for harsh industrial environments such as steel plants, ports, and mining operations.
Typical Applications:
These brakes are commonly used for the travel, trolley, or slewing motions of:
Overhead traveling cranes and gantry cranes.
Portal cranes and ship unloaders.
Conveyor drives and other heavy machinery requiring fail-safe braking.
Summary:
The YWZ9-710/E201 is a heavy-duty, fail-safe drum brake designed for industrial safety. It leverages the smooth power delivery of an E201 electro-hydraulic thruster to provide reliable, shock-absorbent actuation, coupled with the security of automatic spring-applied braking. Its primary role is to ensure controlled deceleration and safe, zero-power holding of machinery.
