JZ-400 is a normally‑closed, AC‑powered electromagnetic drum brake designed for heavy‑duty industrial braking, widely used in hoisting, metallurgy, mining, port, and construction machinery.
Basic Identification
Model: JZ‑400
Type: Electromagnetic drum brake (JZ series)
Brake drum diameter: 400 mm
Matching electromagnet: DT‑400
Braking torque: 1250 Nm (rated)
Weight: Approx. 117 kg
Standards: Complies with JB/ZQ 4388‑86 (mounting dimensions & torque) and JB/T 7685‑2006 (technical requirements)
Working Principle
It is a fail‑safe, normally‑closed brake:
Braking (power off): Built‑in compression springs clamp brake shoes firmly onto the drum, providing constant braking force.
Release (power on): The DT‑400 AC electromagnet is energized, generating magnetic force to overcome spring tension, retract the shoes via lever linkage, and free the drum for rotation.
Self‑adjusting: Automatically compensates for lining wear to maintain consistent braking torque.
Key Features
Normally‑closed design: Ensures safety in case of power failure.
Self‑lubricating bearings at main pivot points: No maintenance lubrication required, high transmission efficiency.
Asbestos‑free brake linings: Riveted as standard; clip‑in integral linings available on request.
Energy‑saving electromagnetic system: High action frequency (up to 600 cycles/hour).
Corrosion‑resistant construction: Suitable for harsh industrial environments.
Easy maintenance: Simple lining replacement and air‑gap adjustment.
Operating Conditions
Ambient temperature: −20 °C to +40 °C
Relative humidity: ≤ 90%
Power supply: 3‑phase AC 380 V, 50 Hz
Altitude: ≤ 2000 m
Environment: No flammable, explosive, corrosive gases, or conductive dust
Applications
Used for deceleration, stopping, and static holding in:
Cranes, hoists, winches
Port machinery (ship loaders/unloaders)
Metallurgical equipment
Mining machinery
Construction machinery
Belt conveyors
