YW-E300/E50A Two-step Series Electro-hydraulic Drum Brakes

YW-E300/E50A Two-step Series Electro-hydraulic drum brakes

The YW-E300/E50A is a specialized Two-Step (Dual-Speed) Electro-Hydraulic Drum Brake. Unlike standard brakes that simply open or close, this unit features a "soft braking" capability, allowing for a two-stage stopping process (Fast Stop → Slow Speed → Full Stop). This is critical for preventing load swinging in cranes or belt tearing in conveyors.

The model number breakdown is as follows:

YW: The series designation for Electro-Hydraulic Drum Brakes.

E300: Indicates the Braking Torque class or Frame Size (Approx. 3000 N·m).

E50A: The specific Two-Step Thruster Model. The "E50" corresponds to a 500N thrust actuator, and "A" typically denotes the specific modification for dual-speed operation (often involving a secondary solenoid or internal valve logic).

💡 Key Features & Characteristics

Two-Step Braking (Soft Stop):
This is the defining feature of the "E...A" series. It allows the brake to apply in two distinct stages:

First Stage (Pre-Braking): The brake applies a reduced torque to decelerate the machinery to a "creep" speed.

Second Stage (Final Stop): After a set time or speed reduction, the brake applies full torque to bring the machine to a complete halt.

Benefit: This significantly reduces mechanical shock, prevents load sway in cranes, and extends the life of gearboxes and couplings.

Dual Electrical Control:
To achieve the two-step action, the thruster typically requires a specific control circuit (often involving two contactors or a control transformer) to switch between the "High Speed/Release" and "Low Speed/Braking" states.

Interlocking Equalizing Mechanism:
Like the standard YW series, this unit features a mechanical linkage that ensures both brake shoes retract and apply equally. This prevents uneven wear and heat buildup.

Visual Torque Adjustment:
The main compression spring is housed in a square tube with a graduated scale, allowing operators to easily read and adjust the final braking torque.

Maintenance-Free Linkage:
The main pivot points are equipped with self-lubricating bearings, eliminating the need for manual greasing.

🏭 Typical Applications

The YW-E300/E50A is used in applications where smooth deceleration is as important as the final stop:

Cranes & Hoists: Specifically for the hoisting mechanism to prevent the load from swinging when the brake is applied.

Belt Conveyors: Prevents the belt from tearing or slipping due to sudden stops (especially on long conveyors).

Stackers & Reclaimers: Reduces structural stress during emergency stops.

Mining Winches: Ensures smooth cable spooling.

📋 General Technical Specifications

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Note: The E50A thruster is electrically different from a standard E50 thruster. It usually has additional wiring terminals (often 4 or 5 wires instead of the standard 3) to control the secondary braking stage. When replacing this unit, you must match the "Two-Step" (or "Soft Stop") specification; a standard thruster will not provide the two-stage braking function.

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