ZWZA,ZWZB Series Dc Electromagnetic Drum Brakes ZWZA500-2500B-20%CP

ZWZA and ZWZB series are DC electromagnetic drum brakes designed for DC - driven equipment, and ZWZA500 - 2500B - 20%CP is a specific model in the ZWZA series. It follows the fail - safe principle of spring - applied braking and electromagnetic release, with excellent stability and adaptability, and is widely used in heavy - duty DC - driven industrial scenarios. The detailed working principle, product features and typical applications of this model are as follows:

Working PrincipleThis model adheres to the power - off braking and power - on release mechanism, which is a typical fail - safe design, and its core working process is divided into three stages:

Braking Engagement (Power - off Safety State): When the equipment stops running, malfunctions, or has a power outage, the electromagnetic coil of the brake loses power and no longer generates electromagnetic force. At this time, the internal compression spring in the enclosed square tube expands and pushes the two brake shoes outwards. The brake linings on the brake shoes clamp the brake drum tightly, and the friction force generated thereby forms a braking torque of 2500 N·m, which rapidly decelerates and stops the rotating mechanism of the equipment, and firmly holds the load to prevent dangerous phenomena such as sliding.

Brake Release (Power - on Operating State): When the equipment needs to start working, the DC electromagnetic coil (usually compatible with DC 110V or 220V voltages) is energized. The generated strong electromagnetic attraction overcomes the elastic force of the compression spring, pulls the armature and the connecting rod mechanism, and makes the brake shoes retract inward. With the help of the interlocking clearance equalizing device, the two sides of the brake shoes maintain equal retraction distance, avoiding the phenomenon that one side of the brake lining is attached to the brake drum. At this time, the brake drum can rotate freely with the equipment shaft, ensuring the normal operation of the equipment.

Stable Operation Guarantee: The model is equipped with a new type of armature automatic centering device, which can keep the armature and the yoke in good fit at all times, ensuring the stability of electromagnetic attraction. Meanwhile, the main hinge points are installed with self - lubricating bearings, which not only improves transmission efficiency but also avoids the problem of poor braking performance caused by insufficient lubrication.

Key Product Features

Convenient Adjustment and Maintenance: It is equipped with an interlocking type retreat distance equalizing device, which can always maintain the equal retreat distance of the brake shoes on both sides without frequent manual adjustment. The brake lining adopts a card - mounted integral forming structure. When the lining is worn, it can be replaced quickly without disassembling the whole brake. Users can also choose semi - metallic (asbestos - free) hard, semi - hard or soft brake linings according to different working conditions. In addition, the brake spring is arranged in the square tube and is equipped with a scale, so users can directly read the braking torque value without complicated measurement and calculation.

Durable Structure Design: The enclosed spring tube can effectively protect the internal compression spring from external damage and pollution, extending the service life of the spring. The self - lubricating bearing at the main hinge point avoids the trouble of regular lubrication during use while ensuring the transmission efficiency, and is more durable in long - term intermittent operation.

Stable Working Performance: The 20%CP in the model number usually refers to the load factor or duty cycle parameter, which means that the brake can stably operate under the intermittent working condition with a 20% duty cycle, and the maximum number of actions per hour can reach 720 times, which can meet the frequent start - stop requirements of industrial equipment.

Typical Application ScenariosThis model is specially designed for DC - driven machinery and is not suitable for AC - driven equipment. It is often used for deceleration and parking braking of heavy - duty mechanisms, and its typical application scenarios include:

Heavy - duty Lifting Equipment: It is applicable to DC - driven electromagnetic hoists, large - tonnage winches and gantry cranes in workshops and factories. It can provide reliable braking force when lifting and lowering large - weight workpieces, ensuring the precise positioning of the load and preventing the load from falling accidentally during the holding process.

Port and Shipping Loading and Unloading Machinery: In port terminals, it can be matched with DC - driven container lifting equipment, bulk cargo loaders and unloaders. It can realize rapid braking during the loading and unloading of goods, adapt to the high - frequency operation rhythm of ports, and improve the safety and efficiency of loading and unloading operations.

Metallurgical Industry Equipment: It is used in DC - driven mechanisms such as billet conveyors, converter auxiliary trolleys and ladle turntables in steel plants. It can adapt to the harsh working environment with large dust in metallurgical workshops, and ensure the stable braking of equipment during the transportation of high - temperature molten steel and billets.

Other Heavy - duty Conveying Equipment: It can be installed on large - scale DC - driven belt conveyors used in coal mines, cement and other industries. It can realize smooth braking during the transportation of bulk materials, avoid material spilling caused by sudden stop of the conveyor belt, and ensure the continuous and stable operation of the conveying line.

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