German Demag brake, Demag model, Demag price

Demag brakes are the actuating components in the entire braking system. Electromagnetic brakes are installed on trailer wheels. Their structure is shown in Figure 1. The entire brake mainly consists of components such as the electromagnet, lever drive mechanism, front and rear brake shoes, base plate, and friction ring. They are mechanical parts that stop or decelerate moving parts in machinery, commonly known as brakes. Brakes mainly consist of a brake frame, braking elements, and operating devices. Some brakes are also equipped with automatic adjustment devices for braking element clearance. To reduce braking torque and structural size, brakes are usually installed on the high-speed shaft of the equipment, but for large equipment with high safety requirements (such as mine hoists, elevators, etc.), they should be installed on the low-speed shaft near the working part of the equipment.

Demag Brake Introduction

The electromagnet is a key part of the electromagnetic brake and has a significant impact on the performance stability and reliability of the electromagnetic brake. When a vehicle uses the brakes continuously while going down a long slope or performs emergency braking at high speed, the temperature of the brake working components will rise sharply. When the temperature reaches a certain level, due to the combined effects of mechanical, physical, and chemical factors, the friction coefficient of the brake friction pair decreases, and the braking efficiency of the brake declines. This phenomenon is called thermal fade of braking efficiency. The resistance to thermal fade is one of the important indicators for evaluating brake performance. The following analyzes the temperature field of the electromagnet and friction ring at various stages during descent down a long slope using finite element analysis methods, and verifies the accuracy of the analysis model and method through experiments.

Demag Brake Working Principle

The friction ring rotates together with the brake drum, and the electromagnet is connected to the drive lever via a retaining ring. At the start of braking, the controller sends a braking signal, the electromagnet is energized, generating electromagnetic attraction force and adsorbing onto the friction ring. Since the electromagnet is constrained by the drive lever, it slides relative to the friction ring, and the friction force acting on the electromagnet drives the connected drive lever to rotate around the fulcrum. The driven end of the lever opens the two friction shoes of the brake and presses them against the brake drum, generating braking torque. At the end of braking, the electromagnet is de-energized, the attraction force and friction force disappear, and under the pull of the return spring, the friction shoes leave the brake drum, releasing the brake. Electromagnetic brakes are an ideal automation actuator in modern industry, mainly playing roles in power transmission and motion control in mechanical transmission systems. They have advantages such as compact structure, simple operation, sensitive response, long life, reliable use, and ease of achieving remote control. They are mainly matched with series motors. Widely used in metallurgy, construction, chemical industry, food, machine tools, stage, elevator, ship, packaging and other machinery, as well as in situations requiring braking during power failure (safety).

Demag Brake Precautions for Use

1) Use the electromagnetic brake in a state completely free of moisture, oil, etc. If the friction parts are contaminated with moisture or oil, the friction torque will be greatly reduced, and the braking sensitivity will deteriorate. To avoid these situations during use, please install a cover. 2) When used in places with a lot of dust, please place the entire brake in a box. Electromagnetic brakes below 60KGM can use the vertical type, and even higher models can use it. 3) Please use the specified specifications for the length of the long shaft used to install the brake. Please use one of the specified keys for the installation shaft. 4) Considering factors such as thermal expansion, please select the thrust of the installation shaft to be below 0.2MM. 5) During installation, please adjust the attraction gap on the machine to within plus or minus 20% of the specified value. 6) Please keep the bracket light and do not subject the brake bearing to excessive pressure. 7) For assembly screws, please use spring washers, adhesives, etc., to prevent loosening. 8) While maintaining the lead wires using the frame on the mechanical side, ensure secure connections using terminal blocks, etc.

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