The YW - E315/E30 is a two - step electro - hydraulic drum brake (315 mm drum diameter, matched with ED30/5 thruster). It is specially designed for the traveling mechanism of medium - sized cranes and the working braking of belt conveyors, featuring two - stage braking force adjustment, automatic clearance equalization, and reliable fail - safe operation.
Core Specifications
| Parameter | Value |
|---|---|
| Drum diameter | 315 mm |
| Rated braking torque | 200-450 N·m (step 1: ~200-280 N·m; step 2: ~350-450 N·m, adjustable) |
| Matched thruster | ED30/5 (300 N thrust, 50 mm stroke) |
| Two - step delay | 1-15 s (adjustable via one - way speed control valve in the damping cylinder circuit) |
| Brake clearance | 0.8-1.2 mm (interlocking equalization mechanism maintains balance) |
| Friction lining | Non - asbestos, thickness 14 mm (replace when ≤4 mm) |
| Operating system | Normally closed (spring - applied, electro - hydraulic released) |
| Ambient temp | -20 °C to +50 °C |
| Relative humidity | ≤90% |
| Weight | ~75 kg |
| Installation center height | 220 mm |
| Insulation class | B (thruster motor) |
| Action frequency | Up to 1200 times/hour |
| Standards | JB/T6406-2006, DIN15435 |
Two - step Working Principle
Step 1 (Deceleration Braking): When braking is initiated, the system applies a smaller, adjustable torque first. This ensures smooth deceleration of the mechanism, preventing impact and reducing wear on mechanical components.
Step 2 (Holding/Wind - resistant Braking): After the mechanism stops, the second - stage torque is added. The delay between the two steps (1-15 s) can be adjusted via the one - way speed control valve. This step provides reliable holding force, especially suitable for outdoor cranes to resist wind loads.
Fail - Safe Operation: When the power is off, the thruster loses pressure, and the high - stiffness return spring forces the brake shoes to clamp the drum, achieving emergency braking to ensure equipment and personnel safety.
Structure & Key Advantages
Structure
It consists of a reinforced brake frame, left and right brake shoes, a two - stage force - adjusting spring group, an interlocking clearance equalization mechanism, an ED30/5 electro - hydraulic thruster, a damping cylinder, and a fixed base. The main hinge points are equipped with self - lubricating bearings, and the torque scale on the spring tube allows for intuitive adjustment.
Key Advantages
Smooth braking: The two - step torque adjustment avoids mechanical impact during deceleration.
Low maintenance: The interlocking clearance equalization mechanism and self - lubricating bearings reduce manual intervention; plug - in liners enable quick replacement.
Reliable wind resistance: The second - stage enhanced torque effectively resists wind loads on outdoor cranes.
Adjustable delay: The 1-15 s delay between the two steps can be flexibly adjusted to adapt to different working conditions.
High action frequency: It can meet the frequent start - stop requirements of high - duty cycle equipment.
Applications
Primary: Deceleration and holding braking for the traveling mechanism of medium - sized outdoor gantry cranes and bridge cranes; working braking for medium - duty belt conveyors in metallurgy, coal, and logistics industries.
Secondary: Braking for the slewing and luffing mechanisms of special cranes that require smooth deceleration and reliable holding.
