JZ-400 Electromagnetic Drum Brakes

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.

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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

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