YW-E315/E30 Two-step Series Electro-hydraulic Drum Brakes

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.

 

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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.

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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.

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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.

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Installation & Maintenance

Installation:

Mount on a rigid base to ensure the drum concentricity (runout ≤0.15 mm) and the thruster pushrod alignment (no lateral force).

Connect the thruster to a 380 V three - phase power supply and fill it with ISO VG 32/46 hydraulic oil to the specified level.

Adjust the one - way speed control valve to set the two - step delay time according to the working condition requirements, and test the braking sequence and flexibility before commissioning.

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Common Faults & Fixes

Fault	Possible Cause	Repair
Unsmooth two - step braking	Improper delay setting or blocked speed control valve	Re - adjust the delay time; clean or replace the speed control valve.
Weak second - stage torque	Spring fatigue or incorrect spring adjustment	Adjust or replace the spring; re - calibrate the torque according to the scale.
Brake drag	Jammed clearance equalization mechanism or stuck pushrod	Clean and lubricate the equalization parts; lubricate the pushrod.
Thruster fails to act	Motor phase reversal or clogged oil filter	Correct the motor phase; replace the oil filter and refill the hydraulic oil.
Oil leakage from the damping cylinder	Damaged seal ring	Replace the seal ring of the damping

 

The YW - E315/E30 two - step electro - hydraulic drum brake adopts a tiered maintenance schedule, with intervals adjusted according to usage intensity and environmental conditions. Below is the standard maintenance frequency and key items:

Standard Maintenance Cycle & Core Tasks

Cycle	Maintenance Items
Daily	Check the thruster oil level, pipeline leaks, and abnormal noise; clean oil stains and debris on the drum surface.
3 months	Inspect the liner wear and the seal integrity of the thruster and damping cylinder; tighten loose fasteners.
6 months	Replace the thruster hydraulic oil (ISO VG 32/46); check the elasticity of the return spring and the damping cylinder for oil leakage.
12 months	Overhaul the thruster and damping cylinder; replace the liners if the thickness is less than 4 mm; resurface the drum if there are deep scratches.
2 years	Replace the seals of the thruster and damping cylinder; calibrate the two - stage braking torque and the delay time.

Adjustment of Maintenance Intervals

High - intensity usage (action frequency close to 1200 times/hour, heavy load): Shorten the 3 - month and 6 - month maintenance intervals to 1 month and 3 months respectively.

Severe environment (high dust, high humidity, extreme temperature): Shorten the 6 - month and 12 - month intervals to 3 months and 6 months; increase the frequency of daily cleaning and inspection.

Light - duty usage (low frequency, light load): The maintenance cycle can be appropriately extended, but the daily inspection and 12 - month overhaul cannot be omitted.

Special Inspection Triggers

If there are abnormalities such as unsmooth two - step braking, weak braking torque, brake drag, or thruster failure to act, stop the machine immediately for inspection and troubleshooting, regardless of the maintenance cycle.

After the brake has been out of service for more than 6 months and is put back into use, a comprehensive inspection and test run must be carried out before operation.

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