TJ2-300/200 Electromagnetic Drum Brakes

⚙️ Product Overview

The TJ2-300/200 is a TJ2 Series AC Electromagnetic Block Brake (often referred to as a drum brake). It is a robust, industrial braking device widely used in lifting and transportation machinery.

The model designation typically indicates:

TJ2: The series standard for AC electromagnetic block brakes.

300: The compatible Brake Drum Diameter of 300 mm.

200: Often refers to the specific braking torque rating (approx. 200 N·m at 100% duty cycle) or a specific variation in the lever ratio/spring configuration designed for that torque class.

It operates on a "Normally Closed" principle, meaning the brake engages automatically via spring force when power is cut, ensuring safety in emergency situations.

💡 Key Features & Characteristics

Electromagnetic Actuation:
The brake is driven by an AC Electromagnet (typically the MZD1-300 model). When the magnet is energized, it pulls the armature, compressing the main spring and releasing the brake shoes from the drum. When power is cut, the spring force pushes the shoes against the drum to stop motion.

Fail-Safe Design:
As a normally closed device, it provides automatic braking during power failures, making it critical for safety applications like hoists and cranes.

Adjustable Braking Torque:
The braking torque can be adjusted by changing the compression length of the main spring. This allows users to fine-tune the braking force to match the specific inertia of the machinery.

Simple & Reliable Structure:
The TJ2 series is renowned for its simple mechanical design, consisting of a base, brake arms (levers), brake shoes (tiles), and an adjustment rod. This simplicity makes it easy to maintain and repair.

Replaceable Linings:
The brake shoes are equipped with replaceable friction linings (often asbestos-free or composite materials) to increase the friction coefficient and extend the service life of the brake wheel.

🏭 Typical Applications

The TJ2-300/200 is specifically designed for frequent operation and rapid starting scenarios. Common applications include:

Cranes & Hoists: Used on the travel and luffing mechanisms of cranes where precise stopping is required.

Conveyors: Belt conveyors in mining or logistics.

Metallurgy: Steel mill machinery requiring rugged braking.

Winches: Construction and mining winches.

📋 General Technical Specifications

Note: The TJ2 series is an older, classic design. While reliable, for very high-frequency applications, modern electro-hydraulic (YW series) or disc brakes are often preferred for smoother operation. However, the TJ2 remains popular for its cost-effectiveness and simplicity.

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