TJ2 Series Electromagnetic Drum Brakes TJ2-200/200

The TJ2-200/200 belongs to the TJ2 series of electromagnetic drum brakes. All brakes in this series adopt a normally closed band brake structure operated by AC electromagnets, featuring safety and reliability, low electromagnetic noise, and simple commissioning. Below is a detailed introduction to its specific working principle and application scenarios:

Working Principle

The core components of this brake include a vertical plate frame, brake shoes, an adjusting rod, compression springs, a base, and a single-phase AC braking electromagnet. The brake shoes are equipped with replaceable asbestos brake linings to enhance frictional braking effect. Its braking and release actions are achieved through the coordination of the electromagnet and compression springs, with the specific processes as follows:

Braking: As a normally closed brake, it defaults to the braking state when the equipment is powered off. At this time, no current flows through the electromagnet, and there is no electromagnetic attraction. The compression springs release elastic force to push the vertical plate frames and brake shoes on both sides, tightly clamping the brake drum. Strong friction is generated between the asbestos brake linings on the brake shoes and the brake drum, forming braking torque, which then quickly absorbs the inertia of the equipment's rotating mechanism, realizing deceleration or stopping of the equipment and preventing objects from moving out of control due to gravity or inertia.

Brake Release: When the equipment starts and requires brake release, the single-phase AC braking electromagnet is energized and generates electromagnetic attraction. The attraction action of the electromagnet drives the adjusting rod to link, prompting the vertical plate frames on both sides to open outward against the elastic force of the compression springs. The brake shoes then separate from the brake drum, the friction between them disappears, and the braking state is released. The transmission mechanism of the equipment can then normally drive the brake drum to operate, ensuring the smooth start and operation of the equipment.

Application Scenarios

This brake is suitable for components with a wheel diameter of approximately 200mm, and its braking torque ranges from 10 to 500Nm, which can meet the braking needs of various medium and low-load machinery. It is widely used in multiple industrial fields:

Hoisting and Transportation Machinery: This is its core application field, commonly found in equipment such as cranes, electric hoists, and belt conveyors. For example, when a crane lifts heavy objects, it can precisely control the lifting and lowering speed of the heavy objects, and maintain the braking state even in the event of sudden power failure to prevent the heavy objects from falling; when the conveyor transports materials, it can quickly brake to avoid material accumulation or scattering due to inertia.

Metallurgical and Mining Machinery: It can also be adapted to scenarios such as small conveyor rollers in metallurgical plants and small hoisting equipment in mines. Such environments are often dusty, but the brake has a good dirt-resistant structure and simple commissioning. It can control the operation rhythm of the equipment through braking, prevent the equipment from running out of control due to inertia, and ensure the stable and safe transportation of metallurgical raw materials and mine ores.

Construction Machinery: Suitable for equipment such as material lifts and small construction hoists on construction sites. These equipment are responsible for the vertical transportation of construction materials or construction personnel, and have extremely high requirements for braking safety. The power-off braking characteristic of this brake can immediately lock the equipment in emergency situations such as sudden power failure, avoiding safety accidents such as falls.

General Machinery Supporting: It can also be supporting for general machinery such as auxiliary transmission mechanisms of machine tools and small winches. Such equipment starts and stops frequently during operation. This brake has a fast and stable braking response, and the asbestos brake linings of the brake shoes are replaceable with low maintenance costs, which can meet the needs of long-term and high-frequency braking use.

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