1. Core Function & Working Principle
The TJ2 series is a spring-applied, electromagnetically-released brake. It is designed as a normally closed (fail-safe) device.
Braking (Power Off): When the power is cut, a compression spring forces the brake shoes (pads) against the brake wheel (drum), stopping the machinery.
Releasing (Power On): When the AC electromagnetic coil is energized, it generates a magnetic field that pulls the armature, overcoming the spring force and releasing the brake (opening the "jaws").12
2. Decoding "TJ2-200/200"
The model number provides specific information about the brake's dimensions and configuration:
TJ2: Indicates the series (AC Electromagnetic Block Brake).
First "200": Refers to the diameter of the brake wheel (drum) the brake is designed to fit, which is 200 mm.
Second "200": Refers to the model number of the配套 (supporting) AC electromagnetic iron (coil), specifically the MZD1-200 model. This ensures sufficient force to open the brake.12
3. Key Technical Specifications
表格
| Parameter | Specification | Details |
|---|---|---|
| Type | AC Electromagnetic Block Brake | Powered by alternating current. |
| Action | Normally Closed (Fail-Safe) | Applies brake on power loss. |
| Brake Wheel Diameter | 200 mm | Standard size for this model. |
| Paired Electromagnet | MZD1-200 | The specific coil used to actuate it. |
| Rated Torque | Approx. 160 N·m | (Based on standard TJ2-200 specs). |
| Voltage | AC 380V / 50Hz | Standard industrial power (others available). |
| Application | High-speed shafts | Typically mounted on high-speed shafts of gearboxes or motors. |
4. Key Features
Robust Construction: Made from steel components. The lever is forged steel, and the housing is sturdy to withstand heavy impacts.
Replaceable Friction Linings: The brake shoes are lined with asbestos or composite friction material (high friction coefficient) that can be replaced when worn out.
Simple Adjustment: Features an adjustment rod and nuts that allow technicians to manually set the brake shoe clearance (air gap) and spring tension.
Fast Response: Designed for frequent operation with a quick response time (typically less than 0.15 to 0.2 seconds).
Hinged Structure: The brake arms are connected via pins, allowing for smooth pivoting action when the electromagnet pulls or releases.12
5. Typical Applications
The TJ2-200/200 is commonly found in:
Cranes & Hoists: Used on the hoisting and traveling mechanisms of bridge cranes and gantry cranes.
Elevators & Lifts: For emergency braking and holding.
Conveyors: To stop belt conveyors quickly in case of emergency.
Industrial Machinery: Any machinery requiring a reliable, fail-safe brake on a high-speed shaft.12
6. Maintenance & Operation Tips
Air Gap Check: Regularly inspect the gap between the brake lining and the drum. If the gap is too large (due to wear), the braking torque will decrease. Adjust using the adjustment nuts.
Spring Tension: Ensure the main spring is adjusted correctly. Too tight, and the electromagnet may not open the brake; too loose, and the brake may slip.
Coil Inspection: Inspect the MZD1-200 electromagnetic coil for signs of overheating or burning, especially if the brake is chattering (vibrating) during operation.
Lubrication: Keep the hinge points (pins and bushings) lubricated to ensure smooth movement and prevent seizing.
