ZWZB-200/100 Electromagnetic Drum Brakes

⚙️ Product Overview

The ZWZB-200/100 is a heavy-duty DC Electromagnetic Drum Brake (Block Type). It is part of the ZWZB series, which was designed to replace older ZWZ3 models and complies with specific Chinese industrial standards (GB6334-86 and JB/T7685-2006).

The model number breakdown is as follows:

ZWZB: The series designation for DC Electromagnetic Block Brakes.

200: The compatible Brake Drum Diameter of 200 mm.

100: The nominal Braking Torque of 100 N·m (at the specified duty cycle).

This brake is specifically engineered for DC drive systems, offering smooth operation and high reliability in industrial environments.

💡 Key Features & Characteristics

DC Electromagnetic Actuation:

Power Supply: Operates on DC Voltage (typically rectified from AC or via a DC power supply).

Performance: DC operation provides lower noise, less mechanical shock during engagement, and longer coil life compared to AC brakes. It is suitable for high-frequency operation (up to 720 cycles/hour).

Fail-Safe Design (Normally Closed):
The brake operates on a "spring-applied, electrically released" principle.

Power Off: Strong compression springs force the brake shoes against the drum to stop the machinery (Safety state).

Power On: The DC electromagnet energizes, pulling the armature to overcome the spring force and release the brake.

Interlocked Equalization:
The mechanism features a linked equalizing device. This ensures that the brake shoes (tiles) retract evenly from the brake wheel on both sides. This prevents one side from rubbing (dragging) against the drum while the other is open, significantly extending lining life.

Self-Lubricating Bearings:
Main pivot points are equipped with self-lubricating bearings, eliminating the need for frequent manual greasing and ensuring high transmission efficiency.

Easy Maintenance:

Torque Scale: The brake spring is housed in a square tube with a visible scale, allowing users to read the braking torque value directly.

Quick Change Linings: The brake linings are "card-mounted" (slotted) for quick and easy replacement without disassembling the entire shoe.

🏭 Typical Applications

The ZWZB series is primarily recommended for DC-driven machinery or applications requiring precise, smooth braking:

Electromagnetic Cranes: Cranes powered by DC motors or DC grids.

Metallurgy: Steel mills where reliable braking is critical.

Port Machinery: Ship-to-shore cranes and unloaders.

Mining: Hoists and winches with DC drive systems.

Note: While ZWZB brakes can be used on AC-driven machinery (with a rectifier), they are primarily recommended for DC-driven applications. For pure AC applications without rectification, other series (like MW or TJ2) are often preferred.

📋 General Technical Specifications

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