TJ2300/200 Electromagnetic Drum Brake | Fail-Safe Crane Brake

1. Product Model Definition & Code Explanation

Full Model No.: TJ2-300/200 Electromagnetic Drum Brake

TJ2-300/200 belongs to the TJ2 series AC electromagnetic shoe drum brake. It adopts normally closed fail-safe structure and is widely used for parking braking, load holding and emergency stop of lifting and conveying machinery. The product complies with JB/T6406 industrial standard.

Model Code Interpretation:

TJ2: Series code for AC electromagnetic drum brake

300: Matching brake drum diameter: 300 mm

200: Rated braking torque 200 N·m under continuous duty JC=100%; max 500 N·m for intermittent duty JC=25~40%

2. Product Overview

TJ2-300/200 electromagnetic drum brake is a mature normally closed industrial brake with the working principle of spring applied braking, electromagnetic release. It is equipped with MZD1-300 AC electromagnet as the driving component. When energized, the electromagnet pulls the armature and linkage mechanism to separate brake shoes from drum and release the brake. When power is cut off or power failure occurs, the built-in main compression spring immediately pushes the brake shoes to clamp the brake drum to realize emergency braking.

This brake features simple lever linkage structure, adjustable braking torque and replaceable friction lining. It is economical and reliable for intermittent working cycles, widely adopted as safety brake for small & medium hoisting and transmission equipment.

3. Core Features & Product Advantages

Fail-Safe Normally Closed Safety Design: Spring applied braking, automatic brake engagement once power is lost. Effectively prevents load falling and equipment runaway, ensures machine safety.

Adjustable Braking Torque: Braking torque can be precisely adjusted by changing the preload of the main spring to meet different load requirements.

AC Electromagnetic Drive: Matched with MZD1-300 AC electromagnet, fast response and stable action for frequent start-stop working conditions.

Simple & Robust Mechanical Structure: Less wearing parts, easy on-site installation and commissioning, low technical threshold for operators.

Quick Replaceable Friction Lining: Non-asbestos friction lining can be replaced without disassembling the whole brake, greatly reducing downtime and maintenance cost.

Stable Friction Performance: Non-asbestos semi-metallic lining maintains stable friction coefficient, low wear and low dust.

Cost-Effective Solution: Mature industrial design, competitive factory price, ideal for general lifting and conveying equipment.

Compliant with Industrial Standard: Manufactured and tested according to JB/T6406 for heavy-duty industrial application.

4. Application Scope

TJ2-300/200 electromagnetic drum brake is designed for industrial machinery requiring safe parking, load holding and emergency stop:

Overhead cranes, gantry cranes, electric hoists and winches

Belt conveyors and bulk material conveying equipment

Metallurgical, mining and construction machinery

Workshop material handling and lifting equipment

Other transmission and hoisting machinery needing power-off safety braking

5. Complete Technical Parameters

表格

6. Working Principle

Power-on Release (Normal Operation State)When AC power is supplied to the MZD1-300 electromagnet, magnetic force attracts the armature and drives the lever linkage mechanism. It overcomes the preload of the main spring and pushes the brake shoes away from the brake drum. The brake is fully released, and the equipment can run freely without braking resistance.

Spring Braking (Emergency & Parking State)When the power supply is cut off or power failure occurs, the electromagnet loses magnetic attraction instantly. The pre-compressed main spring drives the lever mechanism, forcing brake shoes to tightly clamp the 300mm brake drum. Stable friction braking torque is generated to stop rotation and hold the load firmly, preventing safety accidents such as load dropping.