TJ2-200/200 Electromagnetic Drum Brakes

TJ2-200/200 Electromagnetic Drum Brakes

The TJ2-200/200 is a short-stroke AC Electromagnetic Drum Brake. It is a "normally closed" block-style brake widely used in lifting and transport machinery. The "200/200" designation indicates that both the brake wheel diameter and the specific electromagnetic coil/armature size are matched at the 200mm scale.

The model number breakdown is as follows:

TJ2: The series designation for AC Electromagnetic Block Brakes.

200 (First number): The Brake Wheel Diameter of 200 mm.

200 (Second number): The Electromagnet Size/Coil Specification (matched to the MZD1-200 coil).

💡 Key Features & Characteristics

Electromagnetic Actuation (Short Stroke):

Actuator: It is powered by an MZD1-200 AC electromagnet (solenoid).

Operation:

Energized (Open): When electricity flows through the copper coil, the magnetic field pulls the armature (plunger) inward, compressing the main spring and forcing the brake shoes to retract from the drum.

De-energized (Closed): When power is cut, the spring force pushes the armature back, forcing the brake shoes against the drum to stop the machine.

Pure Copper Coil:
High-quality TJ2-200 units typically feature pure copper coils (as opposed to aluminum), which offer better heat resistance, conductivity, and durability during frequent start-stop cycles.

Simple Mechanical Structure:
The brake consists of a steel lever system, brake arms, a base, and an adjustment rod. The linkage is connected via pivot pins (axles), making it robust and easy to repair.

Adjustable Torque:
The braking torque is determined by the compression of the main spring. Users can adjust the spring compression length via a nut to achieve the desired braking force (torque).

Replaceable Linings:
The brake shoes (blocks) are fitted with replaceable friction linings (historically asbestos, now often asbestos-free composites) to increase the friction coefficient and protect the brake wheel.

🏭 Typical Applications

The TJ2-200/200 is designed for medium-duty applications involving frequent operation:

Lifting Machinery: Hoists, winches, and small overhead cranes (specifically for the hoist mechanism to hold loads).

Transport Machinery: Conveyors and material handling equipment.

General Industrial: Any machine requiring rapid deceleration or holding torque on a 200mm shaft.

📋 General Technical Specifications

表格

Note: The TJ2 series is a classic design. While reliable, it relies on the mechanical condition of the pivot pins and springs. If the brake fails to release fully, check for rust on the armature or weak spring compression. If it fails to hold, check the thickness of the brake lining. The MZD1-200 coil is a standard replaceable part; ensure the voltage matches your supply (usually 380V) before installation.

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