The YWZ9 series electric hydraulic drum brake represents the next generation of industrial braking technology, engineered for demanding heavy-duty applications where reliability and safety are paramount. With a braking torque range of 200 to 16000 N·m, the YWZ9 series outperforms standard drum brakes, making it the preferred choice for heavy-lift cranes, metallurgical operations, and mining equipment that demand superior stopping power.
Featuring an innovative automatic wear compensation mechanism, the YWZ9 series maintains consistent braking performance throughout the brake pad lifecycle. This self-adjusting design eliminates the need for frequent manual adjustments, reducing maintenance downtime by up to 60% compared to conventional drum brakes. Fully compliant with JB/T6406-2006 and GB6333-86 standards, these brakes ensure your heavy machinery meets the most stringent safety requirements.
Key Specifications at a Glance
| Parameter | Specification |
|---|---|
| Braking Torque Range | 200 – 16000 N·m |
| Brake Wheel Diameter | 160 – 800 mm |
| Operating Temperature | -20°C to +50°C (standard) -40°C to +50°C (with heater) |
| Power Supply | 380V/50Hz 3-phase AC |
| Standards Compliance | JB/T6406-2006, GB6333-86 |
| Protection Grade | IP65 (standard) |
| Key Feature | Automatic wear compensation |
Why Choose YWZ9 Series Drum Brakes?
1. Automatic Wear Compensation Technology
The YWZ9 series incorporates a sophisticated automatic wear compensation mechanism that continuously adjusts brake pad clearance as the friction material wears. This innovative feature maintains optimal braking torque throughout the service life of the brake pads, eliminating the performance degradation common in traditional brakes. The result is consistent stopping power and reduced maintenance intervals—saving up to 60% on maintenance costs over the brake’s lifetime.
2. High-Capacity Heavy-Duty Design
With braking torque capacity reaching 16000 N·m, the YWZ9 series handles loads that exceed standard drum brake capabilities. The reinforced steel construction and optimized leverage geometry distribute braking forces evenly across the brake wheel, preventing hot spots and ensuring reliable performance in continuous-duty applications. This makes the YWZ9 ideal for heavy-lift cranes, ladle handling, and other critical lifting operations.
3. Interlocking Equal Clearance Device
The patented interlocking equal clearance device ensures symmetrical brake pad engagement with the brake wheel at all times. This precision engineering prevents uneven wear, reduces vibration during braking, and extends the service life of both brake pads and brake wheels. The design maintains consistent contact pressure across the entire friction surface, maximizing braking efficiency and minimizing maintenance requirements.
4. Self-Lubricating Bearings
All main swing hinge points feature self-lubricating bearings that eliminate the need for regular greasing. This maintenance-free design ensures consistent transmission efficiency and reduces the risk of brake failure due to neglected lubrication. The bearings are engineered to withstand the high loads and frequent cycling typical of heavy industrial applications.
5. Flexible Brake Pad Options
The YWZ9 series accommodates both riveted and inserted brake pad configurations. Riveted pads provide maximum security for high-vibration environments like mining and metallurgy, while inserted pads allow for faster replacement—reducing maintenance downtime by up to 40%. Both options utilize high-performance friction materials engineered for extended wear life and stable friction coefficients across the operating temperature range.
YWZ9 Series Model Specifications
Select the optimal YWZ9 model based on your required braking torque, brake wheel diameter, and application requirements. Each model features the same automatic wear compensation technology and robust construction.
| Model | Brake Wheel (mm) | Thruster | Braking Torque (N·m) | Weight (kg) |
|---|---|---|---|---|
| YWZ9-160/E23 | 160 | Ed 23/5 | 200 | 25 |
| YWZ9-200/E30 | 200 | Ed 30/5 | 315 | 32 |
| YWZ9-200/E50 | 200 | Ed 50/6 | 450 | 35 |
| YWZ9-300/E50 | 300 | Ed 50/6 | 710 | 58 |
| YWZ9-300/E80 | 300 | Ed 80/6 | 1120 | 62 |
| YWZ9-400/E80 | 400 | Ed 80/6 | 1800 | 95 |
| YWZ9-400/E121 | 400 | Ed 121/6 | 2800 | 102 |
| YWZ9-500/E121 | 500 | Ed 121/6 | 3550 | 142 |
| YWZ9-500/E201 | 500 | Ed 201/6 | 5600 | 148 |
| YWZ9-600/E201 | 600 | Ed 201/6 | 7100 | 195 |
| YWZ9-600/E301 | 600 | Ed 301/6 | 9000 | 205 |
| YWZ9-700/E301 | 700 | Ed 301/6 | 11200 | 265 |
| YWZ9-800/E301 | 800 | Ed 301/6 | 14000 | 325 |
| YWZ9-800/E630 | 800 | Ed 630/12 | 16000 | 340 |
Note: Custom specifications available upon request. Contact our engineering team for high-temperature configurations, special coatings, or non-standard brake wheel diameters.
Primary Applications
The YWZ9 series drum brakes are engineered for the most demanding industrial environments where heavy loads, continuous operation, and safety-critical performance are daily requirements.
Heavy-Lift Cranes & Hoists
Ideal for ladle cranes, charging cranes, and heavy-duty overhead cranes in steel mills and foundries. The high torque capacity and automatic wear compensation ensure reliable holding of molten metal loads where brake failure is not an option. The fail-safe spring-applied design provides immediate braking in emergency situations.
Metallurgical & Steel Mill Operations
Engineered for the extreme conditions of steel mills, foundries, and rolling mills. Optional high-temperature configurations with heat-resistant linings and thermal shields extend operational capability to ambient temperatures up to 300°C. The robust construction withstands exposure to dust, scale, and thermal cycling typical of metallurgical environments.
Mining & Bulk Material Handling
Deployed in mine hoists, stacker-reclaimers, and conveyor systems where heavy loads and harsh conditions demand industrial-grade reliability. The IP65 protection rating and corrosion-resistant options ensure long service life in dusty, abrasive environments. The automatic wear compensation reduces the need for frequent maintenance in remote mining locations.
Port & Terminal Machinery
Suitable for ship-to-shore cranes, gantry cranes, and straddle carriers in port operations. The high braking torque handles the dynamic loads of container handling, while the automatic wear compensation maintains performance during high-duty-cycle operations. Optional marine-grade coatings provide protection against salt spray and coastal environments.
How the Automatic Wear Compensation Works
The YWZ9 series incorporates a sophisticated mechanical system that automatically maintains optimal brake pad clearance as the friction material wears down during normal operation.
The Challenge: Brake Pad Wear
In conventional drum brakes, as brake pads wear, the clearance between pad and brake wheel increases. This leads to increased lever travel, reduced braking torque, and the need for frequent manual adjustments. Without proper maintenance, worn pads can result in brake failure or excessive lever force that damages the thruster.
The Solution: Self-Adjusting Mechanism
The YWZ9 series features an automatic wear compensation device that continuously monitors and adjusts the brake pad position. As the pads wear, the mechanism automatically advances the pad carriers to maintain the factory-set clearance. This ensures:
- Consistent braking torque throughout pad life
- Constant thruster stroke and release time
- Elimination of manual adjustment requirements
- Extended pad life through optimal positioning
- Reduced maintenance costs and downtime
YWZ4 vs YWZ8 vs YWZ9: Which Series is Right for You?
| Feature | YWZ4 Series | YWZ8 Series | YWZ9 Series |
|---|---|---|---|
| Torque Range | 100 – 8000 N·m | 160 – 8000 N·m | 200 – 16000 N·m |
| Key Advantage | Versatile, proven design | Compact footprint | Automatic wear compensation |
| Max Torque | 8000 N·m | 8000 N·m | 16000 N·m |
| Maintenance | Standard adjustment | Standard adjustment | Auto compensation |
| Best For | General industrial | Space-constrained | Heavy-duty, high-cycle |
| Price Point | Economical | Moderate | Premium |
Choose YWZ9 when: You need maximum braking torque (up to 16000 N·m), operate in heavy-duty continuous applications, or want to minimize maintenance with automatic wear compensation. The YWZ9 is the premium choice for critical lifting operations where brake reliability is paramount.
Installation & Operating Requirements
Environmental Conditions
- Temperature Range: -20°C to +50°C (standard); -40°C to +50°C (with optional heater)
- Relative Humidity: ≤ 90% (non-condensing)
- Altitude: ≤ 2000m above sea level
- Atmosphere: Free from flammable gases (explosion-proof models available)
Electrical Requirements
- Thruster Power Supply: 380V/50Hz 3-phase AC (standard); other voltages available
- Duty Cycle: S3-40% (standard); S3-60% for high-frequency applications
- Operating Frequency: Up to 1200 cycles/hour (depending on thruster)
Installation Standards
The YWZ9 series conforms to JB/T6406-2006 technical requirements and GB6333-86 standards. The brake can be installed in horizontal or vertical orientations. The automatic wear compensation mechanism is factory-calibrated and requires no adjustment during installation.
Frequently Asked Questions
What makes YWZ9 different from YWZ4 drum brakes?
The YWZ9 series features automatic wear compensation technology that maintains consistent braking torque throughout the pad life, while YWZ4 requires periodic manual adjustment. YWZ9 also offers higher maximum torque (16000 N·m vs 8000 N·m) and is designed specifically for heavy-duty continuous applications. The YWZ9 is the premium option for critical lifting operations.
How does automatic wear compensation reduce maintenance costs?
The automatic wear compensation mechanism eliminates the need for manual clearance adjustments, which are typically required every 2-4 weeks on conventional brakes. This reduces maintenance labor by up to 60%, extends pad life by maintaining optimal positioning, and prevents brake performance degradation. Over a 5-year period, maintenance cost savings can exceed the initial price premium of the YWZ9.
Can YWZ9 brakes be retrofitted to replace older YWZ4 or YWZ8 brakes?
Yes, in many cases YWZ9 brakes can directly replace YWZ4 or YWZ8 models with the same brake wheel diameter. The mounting dimensions are compatible within the same size range. However, the YWZ9 may have a slightly different envelope due to the wear compensation mechanism, so clearance verification is recommended. Our engineering team can provide retrofit guidance and mounting adapters if needed.
What is the service life of YWZ9 brake pads?
YWZ9 brake pad life depends on duty cycle, load, and operating conditions. In typical crane applications with moderate duty (S3-40%), pads last 3-5 years. The automatic wear compensation extends pad life by maintaining optimal contact pressure. For high-duty applications, we offer sintered metal pads that provide 2-3x longer service life compared to organic materials.
Are YWZ9 brakes suitable for explosion-proof applications?
Standard YWZ9 brakes are not explosion-proof. For hazardous environments (Ex d IIC T4), we offer specially configured YWZ9-Ex models with explosion-proof thrusters (BEd series) and sealed electrical enclosures. These models maintain the same automatic wear compensation features while meeting ATEX and IECEx certification requirements for Zone 1 and Zone 2 applications.
Related Products & Accessories
Complete your heavy-duty braking system with these compatible products:
- Ed Series Electro-Hydraulic Thrusters – High-performance thrusters optimized for YWZ9 heavy-duty applications
- YWZ4 Series Electric Hydraulic Drum Brakes – Economical alternative for standard-duty applications
- YWZ8 Series Electric Hydraulic Drum Brake – Compact design for space-constrained installations
- YWZ13 Series Electric Hydraulic Drum Brake – Next-generation design with enhanced corrosion resistance for port applications
- ZDL Series Brake Wheels – Heavy-duty brake wheels compatible with YWZ9 series
Request a Quote for YWZ9 Series Drum Brakes
Upgrade to the next generation of industrial braking technology. The YWZ9 series delivers the performance, reliability, and reduced maintenance your heavy-duty operations demand. Contact our engineering team to discuss your application requirements and receive a comprehensive quotation.
Contact us today to learn how the YWZ9 series can improve your crane safety and reduce maintenance costs.
